Abstract
One of the easiest method to repair the old pavement is to apply an overlay on them. However, the deteriorated pavement affects the overlay performance by propagating the existing cracks upwards to the overlay due to the stress and strain concentration from the loading and temperature variations. Today, using the asphalt overlays reinforced with geosynthetic interlayers is one of the most effective methods to prevent the reflective cracking. This paper investigates the effects of the temperature, bending fatigue loading frequency and geocomposite tensile strength on the asphalt overlays performance experimentally. The crack initiation and its propagation rate were analyzed by the help of image processing technique and statistically. The obtained results revealed that the temperature has the greatest effect on the reflective cracking rate, so that by increasing the temperature from 20 to 40 °C in addition to increasing the crack growth rate and changing the vertical deformation under the load, the direction of crack formation changes, and besides the reflective cracks, the top-down cracks also appear. Furthermore at the higher loading frequency more than 10 Hz, even in samples reinforced with geocomposite, increasing the temperature from 0 to 20 and 40 °C will increase the crack growth rate between 5 and 30 times. The obtained coefficients of determination (R2) and Adjusted R2 are equal to 0.9936 and 0.9907, respectively, indicating the satisfactory prediction of the model compared to the real observations.
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1 Introduction
Pavement overlay is one of the most basic methods of the road maintenance. However, applying of a new asphalt concrete overlay on the old pavement with cracks will lead to road cracking with a pattern similar to the existing ones [1,2,3]. These types of cracks are called reflective cracks. Considering the constant environmental conditions and the loading pattern, it can be stated that generally after implementing a new asphalt concrete overlay on the previous pavement, the new cracks will appear on the new overlay after a short time. Therefore, these structural defects will damage the new overlay [4,5,6,7]. According to the Texas Department of Transportation (TxDOT), the reflective crack is one of the most serious damages affecting the asphalt overlay and concrete pavements [8].
Regarding the nature of such defects, various opinions have been stated about their origin and conditions. These defects are also likely to occur in asphalt overlays laid on the cement concrete slabs. These cracks are mainly created due to displacement caused by heat or humidity in the concrete slab under the asphalt overlay. Although the origin of cracking is not always the traffic loading, it may cause failures and cracks near the joints [9,10,11]. According to “Asphalt concrete modeling book” by Kim, when a pavement overlay is applied on the existing concrete pavement (semi-rigid structure), some cracks appear due to concrete pavement shrinkage, thermal displacements, or lateral displacements in concrete pavement. Generally, the asphalt overlay layers cannot tolerate high displacements without the damage and cracking. Therefore, the cracks from the joints existing in the concrete pavement or in the old asphalt layer spread out gradually with the destruction of the new asphalt overlay and reach to the overlay surface along its thickness (reflective cracking) [12]. Todays, various methods are available to prevent or delay the occurrence of reflective cracks. Overall, these methods can be classified into the following three categories: 1) Reinforcing the overlay, 2) Reducing the stress through installing stress absorbing membrane interlayer (SAMI), and 3) Repairing and restoring the resistance of the underlying pavement to the time before the overlay was applied.
Prevention of the stress concentration in the newly applied pavement (top layer) can significantly reduce the occurrence of the reflective cracks. Therefore, the researchers have considered several methods to deal with the reflective cracking phenomenon; for example, using the asphalt with wide and non-uniform aggregate gradation, warm mix asphalt (WMA) with the low viscosity, embedding a modified SAMI, and fabrics interlayer that can reduce strains [13].
In this regard, the results of an extensive study on the different stress-absorbing interlayers by Zhang et al. showed that the rubber asphalt can be considered as a suitable mixture for the stress-absorbing layer due to its high elasticity and resistance to fatigue. Also, the results showed that the interlayer shear resistance curve reaches to its maximum value when the asphalt application rate is 2.2 kg/m. According to the cracking data, the fatigue and rupture life of asphalt overlays with rubber stress absorbing interlayer on the old concrete pavement increased by 30 percent [14].
The pavement reinforcement and stress reduction on the pavement layers are the key functions of the geosynthetic materials in road construction projects. The most important advantages of using the geosynthetic materials in asphalt overlay are the stress and displacement reduction on the pavement structure. So, using the geosynthetic materials on the pavement can delay or control some types of cracks including reflective cracks as a stress-reducing layer [15]. Researchers have evaluated the feasibility of the geosynthetic materials’ effect in reducing and delaying the reflective cracks [16]. In addition, some geocomposites have been analyzed as an interlayer in finite element modeling (FEM) for the different designs of asphalt overlay, and their ability to reduce the reflective cracks has been evaluated. Based on the observations, as long as using the geocomposite as an intermediate layer, the asphalt pavement remains healthy without sustaining any damage. In other words, the crack does not pass through the pavement, and the energy generated at the crack tip is dissipated. This membrane serves as a protective shield against the crack tip [17]. In another research on the efficiency of geosynthetics using the 4-point bending test at 20℃, it was found that the composite samples with modified and reinforced asphalt overlays present the higher fatigue life performance than other samples even in heavier traffic loads [18]. The results of an experimental study by a group of transportation researchers showed that in all geocomposite-reinforced specimens, the permanent deformation resistance increased compared to the control samples. Besides, geocomposites reduce the energy required for the crack propagation in thin layer overlays by 3 times [19].
Another role of geosynthetics used in road maintenance is the pavement reinforcing. The geosynthetics, especially geogrids, increase the resistance of the pavement by changing the load distribution pattern and aggregate’s behavior against the load after being implemented in asphalt overlays. Using geogrids with the high tensile strength in pavements can be assumed as a network of rebars in reinforced concrete that prevent the crack propagation in the asphalt overlay [20, 21]. In an advanced laboratory investigation, Çelik et al. (2021) found that using asphalt overlay reduces the vertical displacement in concrete surfaces by 2 to 75%. Furthermore, applying geogrid reinforcement on the developed cracks reduces the strain in the bottom of the asphalt layer from 29.5% to 92.5%. Moreover, using geogrid on the joints instead of increasing asphalt layer thickness from 50 to 80 mm, decreases the strain, displacement, and the overall cost by 57.9 percent [22].
Furthermore, the deformation of geogrids in the pavement causes energy dissipation in the crack tip area, which means preventing the progressive destruction in the pavement properly [20, 21]. Regarding the excellent performance of geogrids in controlling the reflective pavement cracks, many studies have been recently conducted on the effect of different parameters on the pavement performance [23,24,25,26]. The geogrid overlay reinforcement can significantly reduce the crack propagation from the bottom to the top layer. It is noteworthy that the pavement reinforcement would be effective only when the geosynthetic modulus is more than the asphalt layer modulus. Also, it should sufficiently bond to the surrounding asphalt material to strengthen the asphalt overlay [4, 15]. In this regard, Kikwata and Muramatsu (1989) investigated the degree of connection and continuity of geosynthetics with the surrounding asphalt pavement. The results revealed that the geosynthetics hardness indicates the greatest effect in achieving proper overlay performance [27]. The pavement reinforcement can be accomplished using the geosynthetic layer either in the pavement’s lower layers (i.e., aggregate pavement layers such as the base and sub-base) or in its asphalt layer. In any case, to control the reflective cracks, it is necessary to implement the geosynthetic layer in the overlay layer [28]. The type of old cracked pavement (either asphalt or concrete), the location of the geogrid layer in the pavement, and the weather temperature of the pavement site are the most critical factors affecting the cracking rate [4].
Another important parameter of geosynthetics in controlling reflective cracks is the type of loading applied to the pavement complex. In this respect, some experiments have been conducted with the static and dynamic loadings by constant strain on the asphalt overlay reinforced with geogrid. Based on the obtained results, the hardness and bearing capacity of the asphalt overlay before cracking increase with geogrid installation. It should be mentioned that this increase for the sample under dynamic loading is much higher than the similar sample under the static loading [29]. Therefore, it can be concluded that the effect of using geosynthetics in cracking rate and increasing the hardness of the pavement layer under static loading (e.g., parking lots) is far less than areas under dynamic loading (e.g., highways and high traffic areas) [29]. Gonzalez-Torre et al. (2015) investigated the role of type-in geosynthetic in cracking behavior and reported that the geosynthetic elastic modulus is not the only determining factor in controlling the reflective cracks [30]. Finally, it can be said that the anti-reflective cracking systems can be developed by geosynthetics with a high elastic modulus (e.g., geogrid) between asphalt overlays. Considering the gap in past researches, in this paper, it was tried to investigate the crack growth in the asphalt shaped slab samples with different geocomposite and control interlayers under various cyclic dynamic loadings in the opening or bending mode. Also, the speed index and crack growth rate in asphalt pavements with geocomposite or control reinforcements were modeled using the statistical regression method. It should be mentioned that these models are based on the mechanistic-experimental relationships in evaluating the fatigue life, crack growth rate, and etc. in asphalt overlays with geosynthetic materials to delay the reflective cracks. Also, in this paper, for a comprehensive and innovative investigation, the variables of temperature and loading intensity (frequency) in different time intervals were used to better simulate the reflective crack tests on the performance of such geosynthetic reinforcements. The obtained results are applicable in predicting the performance of pavements in different temperature ranges and frequency ranges.
1.1 Objective
In this research, the cyclic bending fatigue tests are performed to study the cracking rate in the asphalt overlay by considering the effect of temperature, loading frequency, and different geocomposites. Also, models for predicting the cracking rate based on the mentioned parameters are established using the statistical analyses. Furthermore, to simulate an old crack, a 1.2-mm wide crack is created in the bottom layer in all samples.
2 Materials and methods
In the ensuing pages, the conventional properties of used aggregates, asphalt binder along with sample preparation methods are provided.
2.1 Materials
The aggregate was obtained from the Qazvin Axis Asphalt Pavement Factory. Located in Abyek city, Alborz, Iran. The aggregate gradation is shown in Fig. 1. Also, a PG 64–22 asphalt binder provided by the Tehran Refinery Inc., was then used to prepare hot asphalt mixture. The conventional properties of the asphalt binder is shown in Table 1. The mix design for all asphalt overlay samples was based on the Marshall Construction Standard (ASTM D 1559) and according to the obtained data from Marshall's tests, in this research the optimum bitumen percentage was determined 4.55% by the weight of mixture.
Also, in this research two types of geocomposite as shown in Fig. 2 were used with characteristics provided in Table 2.
2.2 Samples construction
To prepare the samples, two asphalt slabs were attached to each other with or without geocomposite using PresBox compression-shear compactor as illustrated in Fig. 3. The sample preparation was based on the vertical and shear stresses applied to the sample, air percentage, density (specific gravity), and loading time [4, 24, 31,32,33]. The modified emulsion bitumen with fragile SBS polymer was employed on the top of 7 cm slab as the bottom layer to create a surface pavement (single coat) and the geocomposite layer was placed on that. Then, the typical 5 cm overlay layer was applied to it. As earlier mentioned, the crack with 1.2 mm width has been created as an old crack in the bottom layer for all the samples. Besides, a neoprene rubber layer with an elasticity modulus of 11,000 kPa and a hardness of 65 was used as the bed soil in all tests [4, 24, 31,32,33].
2.3 Bending fatigue test method
The Haversian cyclic loading (load exactly on the crack) with the frequencies of 10, 6, and 2 Hz was performed on all samples at 0, 20, and 40 ℃ in duplicate using the Dynamic Creep Test software ver. 2.03. This kind of loading mode simulates high, medium, and low speed traffics [34]. The maximum value of the loading was equal to 6.9 kN (the compressive stress of 690 kPa). The loading was applied by the UTM25 apparatus (Fig. 4).
2.4 Image analysis
Two cameras located next to the sample continuously captured the pictures with 60 frames per seconds of the reflective cracks during the test and to better observe the cracks in the image analyzing, the side surfaces of the top layer was painted with white plastic construction paint (see Fig. 4). The test was terminated when the top layer of sample was cracked entirely, or in other words the reflective cracks passed the entire thickness. At the beginning of the tests, detecting the crack on the sample is very difficult, and the crack propagation is not visible to the eyes. In the crack initiation stage, the number of cracks is low, and mainly they are micro-crack type. Then, these cracks become wider and macro-cracks. As soon as starting the test, the cameras were taking pictures with a time interval of 1 s. Afterward, analyzing the captured pictures provides a good insight into the shape and process of reflective cracks, the time of initiation, and how the crack spreads in the overlay (see Fig. 5). Standard rulers are used to measure the cracking rate in the overlay. Therefore, it is possible to obtain the average crack penetration rate in the overlay by extracting the length of the crack penetration at the certain time intervals.
2.5 Design of experiment using statistical methods
In this research, Design-Expert software was used to analyze the data obtained from the results of the experiments. Generally, this software is used for designing the experiments, statistical analysis, and optimization. The independent variables considered in this research were the temperature, frequency and the type of geocomposite, and the dependent variable was the cracking rate. The software presents a model according to the information obtained from the analysis of variance (ANOVA) [35,36,37,38]. Moreover in this research, the results of the experiments were analyzed using the response surface method (RSM). The coefficient of determination (R2) and the lack of fit (LOF) are commonly presented to show the model’s validity [39, 40]. The LOF indicates that how much the points are not well distributed around the model, and the model cannot be used to predict the dependent variable. Therefore, with the non-significance of the LOF test, it can be said that the model has been well fitted to the data. In addition, R2 is expressed as the ratio of the changes predicted by the model to the total changes, which is a measure of the degree of fit. The closer R2 value to 1, the more powerful model which can describe the response changes as a function of independent variables [41, 42].
3 Results and discussion
After the sample preparation, they were subjected to fatigue loadings in different conditions along with capturing images. Then using image analyzing the following results were obtained.
3.1 Performance of asphalt slabs at 0℃
The results of image analysis show that the cracks in all reinforced and control samples at 0℃ propagate at a very low rate and in the form of microcracks from the bottom to the top of the overlay. In the control samples, after loading, the cracks initiate exactly from the crack gap, move upward, and reach the overlay surface at a very low speed. The investigations also showed that in samples reinforced with geocomposite of type-I (see Fig. 6) and type-II (see Fig. 7), the cracks grow slower compared to cracks in the control ones. These cracks initiate at a small distance from the simulated crack location and then move upward in the form of microcracks and reach the overlay surface. Moreover, they usually propagate in several branches in the thickness of the overlay.
According to the calculations using the image analysis shown in Table 3, the vertical cracking rate (mm/cycle × 10–4) at 0℃ is very low in the control samples. By increasing the frequency from 2 to 6 and 10 Hz, the cracking rate increases by about 1.2 to 1.4 times, respectively. The growth of the cracks in reinforced overlays with type-I and II geocomposites is observed with a low rate, too. But, with the increase in the loading intensity from 2 to 6 and 10 Hz, the cracking rate increases by 1.25 to 1.45 times in samples reinforced with type-I geocomposite and 1.35 to 1.55 times in samples reinforced with type-II geocomposite, respectively. The decrease in cracking rate at 0℃ in samples reinforced with type-II geocomposite compared to control samples was observed by almost 30% in all frequencies. But, more reduction (55 to 60%) occurred in the cracking rate in samples reinforced with type-I geocomposite in different frequencies. This result represents the appropriate performance of the type-I geocomposite in reinforcing asphalt overlays and delay in the reflective cracking at 0℃.
3.2 Performance of asphalt slabs at 20°C
The results of image processing revealed that the cracks move from the bottom of overlay to its top in all samples like what was observed in 0 °C. At first, the cracks are micro type but shortly turn into one or two main macrocracks. In the control samples, after loading, the cracks initiate exactly from the crack gap in the bottom layer, move upward, and reach the overlay surface at a medium speed. The cracks in slabs reinforced with type-II geocomposite initially grow at a low speed as microcracks, slightly away from the simulated crack. Then, after passing the half of the overlay thickness, one or two main branches grow and appear as macrocracks. It should be mentioned that after 50% of crack growth, the vertical growth rate also increases. The cracks in slabs reinforced with type-I geocomposite move at a very low speed. Similar to the control samples reinforced with type-II geocomposite, the initial cracks are micro type. But, unlike them, in this case the cracks grow as a group of cracks and the width of several branches during loading increases. In addition, the crack opening width in samples reinforced with type-I geocomposite is less than the other samples (Fig. 7). According to the image analysis results (Table 3), the vertical cracking rate at this temperature is much lower for reinforced overlays compared to control ones.
The vertical cracking rate in overlays reinforced with type-II geocomposite compared to control samples is 31 to 47%. Meanwhile, in samples reinforced with type-I geocomposite, this rate has decreased by 64 to 75% compared to control samples in different frequencies. This outcome indicates the better performance of type-I geocomposite similar to 0℃.
3.3 Performance of asphalt slabs at 40℃
Unlike what was seen in 0 and 20℃, the cracks move from the top and bottom of the overlay to its middle part at 40℃ in control asphalt slabs. The cracks are initially formed as microcracks, and after reaching the middle of the overlay, they widen quickly and turn into macrocracks. This change in the cracking process and its initiation direction are related to the temperature rise, the weak adhesion of stone materials to bitumen, or the increase in viscosity and fluidity of the bitumen in the asphalt mixture. It is of note that the cracking rate to reach the overlay surface is very fast at this temperature. Cracks in slabs reinforced with type-II geocomposite at 40℃ first move as microcracks from the top and bottom of the overlay to its middle zone. Afterward, they widen rapidly and covers the entire overlay. The results showed that the cracks grow at a slower rate in the samples reinforced with type-II geocomposite than the control reference samples. The cracking process in the slabs reinforced with type-I geocomposite is similar to type-II geocomposite process, except that the cracks in samples reinforced with type-I geocomposite grow at a slower rate than the samples reinforced with type-II geocomposite. According to Table 3, the vertical cracking rate is very high in reinforced and non-reinforced overlays at 40℃. Also, by increasing the loading rate from 2 to 6 and 10 Hz, the cracking rate increases from 1.16 to 1.43 times, respectively. The assessments showed that the vertical rate of cracking in overlays reinforced with type-II geocomposite has decreased by 14 to 18% compared to the control samples. On the other hand, the vertical cracking rate in overlays reinforced with type-I geocomposite has decreased by 26–27% compared to the control samples. Also, with increasing the loading intensity from 2 to 6 and 10 Hz, the cracking rate increases approximately from 1.21 to 1.52 times. Comparing the cracking rate reduction for all samples, it is revealed that the type-I geocomposite shows better performance that type-II one at 40℃.
3.4 Statistical analysis and presentation of vertical cracking rate regression models in anti-crack multi-layered asphalt pavements
The statistical analysis was performed based on RSM and the historical data in the Design-Expert 12 software. The vertical cracking rate was analysed based on the following independent variables: temperature (T = A), frequency (F = B), and type of interlayer (G = C), as shown in Table 4.
ANOVA results based on the fitting criteria including the degrees of freedom in the source (DF), the sum of squares due to the source (SS), the mean sum of squares due to the source (MS), P-values, and R2 are presented in Table 5. As can be seen, the P-value was acceptable for all independent variables (P < 0.05). Also, P-values for variables AB and AC were smaller than 0.05. In other words, all the variables are significant at the 95% confidence level, indicating that all the research variables are influential in the model. One of the advantages of statistical analysis compared to other analytical methods is the simultaneous examination of the interaction or mutual effect of each variable on the response, which was done in this research. The F-value (F-statistic) of the presented model is equal to 170.99, indicating the model’s good acceptability for describing the response. R2 and R2-adj as the two most important prediction assessment criteria were obtained 0.9936 and 0.9907, respectively. These high values indicate the satisfactory accuracy of that model. Equation (1) presents the extracted model in coded form.
Figure 8 depicts the graph of the predicted values against the actual ones. The results show the acceptable accuracy of the fitted model predicting the cracking rate as the response against the actual values obtained from the experiment. Also, Fig. 9 shows the effect of independent variables and their interaction on the cracking rate. According to the presented cracking rate model and examining the coefficients of their effect, the temperature will have the most significant impact on the response. Also, among the investigated variables in the cracking rate model, temperature and frequency increase the response, while geosynthetic type-I decreases it (Fig. 9a–c). Figure 9d shows the interaction of temperature and frequency on the response variable. As can be seen with increasing the temperature, the samples were loaded with higher frequency experience the higher cracking rates. According to Fig. 9e, the samples reinforced with geocomposites show a lower cracking rate at a constant frequency with increasing temperature. As the temperature rises, this interlayer decreases the cracking rate more considerably.
In this research based on the sensitivity analysis, the influence of the independent inputs on the dependent outputs (responses) for the reinforced and unreinforced asphalt overlays has been investigated through the obtained statistical model. In other words, with this method the sensitivity of the output variable can be determined over an each input variable. According to the output of the sensitivity analysis shown in Fig. 10, it can be seen that in comparison to other parameters the temperature has the greatest effect on the control of reflective cracks and changes in the crack growth rate in reinforced and unreinforced asphalt samples. After that, the type of geocomposite and then the loading intensity will have the greatest effect on the increasing the crack growth rate.
Effect of each variable independently and reciprocally on the cracking propagation rate, a crack growth rate against the temperature for 6 Hz frequency and type-I geocomposite, b crack growth rate against the frequency for 20 °C temperature and type-I geocomposite, c crack growth rate against the geocomposite types for 20 °C temperature and 6 Hz frequency, d interaction of the temperature and frequency against the changes in crack growth rate in type-I geocomposite, e interaction of the temperature and geocomposite type against the crack growth rate changes at 6 Hz frequency.
4 Conclusion
This paper studies the effects of temperature changes, the intensity of loading frequency, and the type of geocomposite on the vertical cracking rate and vertical deformation, followed by the statistical analysis of the laboratory data. According to the obtained data and analysis, the major results of this study are outlined as follows:
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At all loading intensities and temperatures, the samples reinforced with type-I geocomposite have shown the better performance in reduction of cracking rate than those reinforced samples with type-II geocomposite and control ones.
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In the crack initiation stage, the number of cracks is low, and the defects are of microcrack type. Next, these cracks become wider and turn into macrocracks. Also, the cracking form in control samples is usually single-branched mode with a large crack width (due to high stress concentration on the crack). But in reinforced samples, the cracks propagate in the form of microcracks with several branches in the areas far from the crack and spread slowly on the overlay surface. This outcome is attributed to the stress and strain reduction on the overlay surface which is achieved by reinforcing the pavement with the high tensile strength geocomposite.
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Based on the image processing results, the trend and shape of crack growth in reinforced and non-reinforced samples change extremely at different temperatures and frequencies. Usually, at low temperatures and frequencies (0 and 20 ℃), the cracks grow from the bottom to the top of the overlay and have a smaller width. While, with the increase in temperature from 20 to 40 °C, in addition to increasing the crack growth rate and changing the vertical deformation under the load, the direction of the cracks changes by the top to the bottom. The formation of top-down cracks depends on the increase in temperature and being influenceable of asphalt mixtures in these high temperature and frequency ranges.
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The change in the crack propagation process and its starting direction is caused by the increase in temperature and the weak adhesion of aggregate and asphalt and the decrease in bitumen viscosity. In other words, the destruction and cracks in asphalt pavements at high temperatures, in addition to the reflective bottom cracks, are also caused by top-down destruction and cracks.
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It should be noted that the increase of the environment temperature will have a remarkable negative effect on the viscosity of the single-coat layer and the adhesion between the overlay and the geocomposite, and reduces the performance of the reinforcing intermediate layer.
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The temperature has the greatest effect on the control of reflective cracks in both reinforced and control samples. After that, the type of geosynthetic and the loading rate are the effective parameters, respectively.
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The crack growth rate in all studied temperatures is the highest for the control samples. Also, increasing the loading frequency and temperature, in reinforced and control samples, increases that rate. Moreover, the high strength geocomposite (100 kN.m) has shown the greatest effect on improving the performance of asphalt pavement in reducing the crack penetration rate in all temperatures.
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By comparing the graphs of the crack growth rate at all temperatures and frequencies, it is revealed that the lowest crack growth rate corresponds to the samples tested at 0 and 20 °C. A part of this reduction is related to the performance of geocomposite layers at low temperatures and the other part is related to the resistance increase of the asphalt beams at low temperatures.
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The R2 and R2-adj values obtained in the model to estimate the cracking rate based on the temperature, frequency, and geocomposite type are 0.9936 and 0.9907, respectively, which indicating the high accuracy of model.
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According to the result of prediction model and analysis of variance, the P-values for all variables are significant in 95% confidence level. In other words, this indicates that the considered variables are effective in the presented quadratic models.
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The statistical analysis showed that the interaction of temperature and frequency also affects the cracking rate. Furthermore, as the temperature rises, the samples loaded with higher frequency show the higher cracking rate.
Data availability
All data supporting the findings of this study are presented in this article. Any additional data can be obtained from the corresponding author upon reasonable request.
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saeid asadi conceived of the presented idea, developed the theory and performed the computations ,conceived and planned the experiments and carried out the experiments. gholamali shafabakhsh developed the theoretical formalism, performed the analytic calculations, performed the numerical simulations and wrote the manuscript.
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Asadi, S., Shafabakhsh, G. Experimental and statistical investigation on the performance of asphalt overlays reinforced with geocomposite in controlling the reflective cracks under different loadings and temperatures. SN Appl. Sci. 5, 202 (2023). https://doi.org/10.1007/s42452-023-05417-5
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DOI: https://doi.org/10.1007/s42452-023-05417-5