Abstract
Experimental work was performed to study the effect of binding mortar strength on the mechanical properties of recycled natural aggregate concrete mixes as well as reference corresponding natural aggregate concrete mixes. The moduli of elasticity of both NAC and RAC were found to be higher than that of corresponding mortar by about 40% and 10% respectively, for all compressive strengths investigated. It was possible to reach compressive strength for RAC of 53.5 MPa. The ratios of compressive strength of NAC or RAC to that of mortar varied between (1.05–1.56) and (1.02–1.26) respectively, these ratios decreased with the increase in compressive strength. Also from the results of compressive strength, it was found that the ratios cylinder/cube compressive strengths of RAC and mortar were smaller than those of NAC. The ranges of values obtained were (0.71–0.84) and (0.69–0.75) for RAC and mortar respectively, while for NAC this ratio ranged between (0.81–0.92), these values were obtained for compressive strengths ranging between 15 to 55 MPa. It was found that it is better to relate the cylinder/cube strength ratio to the modulus of elasticity of the concrete or mortar rather than to its compressive strength. The flexural strength showed an opposite trend, the ratios of NAC and RAC to that of mortar ranged between (0.72–0.95)% and (0.61–0.80)% respectively. These ratios increased with the decrease in compressive strength of mortars. On the other hand, the splitting tensile strength of NAC was higher than that of RAC and mortar for all strength levels investigated. The ratio of NAC to mortar splitting tensile strength ranged between (1.13–1.69), while this ratio for RAC ranged between (0.87–1.36). Finally, several regressions were developed that can relate the mechanical properties of the three materials investigated.
Résumé
Un travail expérimental a été réalisé pour étudier l’effet de la résistance à la compression de mortiers avec liant sur les propriétés mécaniques de mélanges de bétons recyclés et de mélanges de bétons de référence élaborés à partir de granulats naturels. Les modules d’élasticité des bétons de granulats naturels et recyclés se sont avérés plus élevés que celui d’un mortier de référence, respectivement de 40 et 10%, pour toutes les résistances à la compression étudiées. La résistance à la compression des bétons de granulats recyclés a pu atteindre 53,5 MPa. Les rapports entre les résistances à la compression des mélanges de bétons naturels ou recyclés et celle du mortier ont varié de (1,05–1,56) à (1,02–1,26), respectivement; ces rapports baissaient en fonction de la hausse de la résistance à la compression. On a également trouvé à partir des résultats d’essais de résistance à la compression, que les rapports de résistance à la compression de cylindres ou cubes de mortiers et bétons de granulats recyclés étaient inférieurs à ceux des bétons de granulats naturels. Les valeurs obtenues allaient de (0,71–0,84) à (0,69–0,75), respectivement pour les bétons de granulats recyclés et les mortiers, contre (0,81–0,92) pour les bétons de granulats naturels; ces valeurs étaient obtenues pour des résistances à la compression comprises entre 15 et 55 MPa. On a établi qu’il était préférable de mettre en relation le rapport de résistance des cylindres ou cubes avec le module d’élasticité du béton ou mortier plutôt qu’avec sa résistance à la compression. La résistance à la traction a mené à une tendance contraire: les rapports des bétons de granulats naturels et recyclés étaient compris respectivement entre (0,72–0,95)% et (0,61–0,80)%. Ces rapports ont augmenté avec la baisse de résistance à la compression des mortiers. D’autre part, la résistance à la traction par fendage des bétons de granulats naturels était plus élevée que celle des bétons de granulats recyclés et des mortiers pour toutes les résistances étudiées. Les rapports de résistance à la traction par fendage pour les bétons de granulats naturels allaient de 1,13 à 1,69, contre (0,87–1,36) pour les bétons de granulats recyclés. Enfin, plusieurs régressions mettant en relation les propriétés mécaniques des trois matériaux étudiés ont été développées.
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Abbreviations
- Ecm, Ecn, Ecr :
-
Modulus of elasticity of mortar, NAC, RAC, respectively
- f′cm, f′cn, f′cr :
-
Cylinder compressive strength of mortar, NAC, RAC, respectively
- frm, fm, frr :
-
Modulus of rupture of mortar, NAC, RAC, respectively
- ftm, ftn, ftr :
-
Splitting tensile strength of mortar, NAC, RAC, respectively
- R:
-
Ratio of cylinder to cube compressive strength
- r:
-
Coefficient of correlation
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Kheder, G.F., Al-Windawi, S.A. Variation in mechanical properties of natural and recycled aggregate concrete as related to the strength of their binding mortar. Mat. Struct. 38, 701–709 (2005). https://doi.org/10.1007/BF02484315
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DOI: https://doi.org/10.1007/BF02484315