Abstract
The mechanical properties of recycled aggregate concrete (RAC) may be affected by the service time of parent concrete used to produce the recycled coarse aggregate (RCA), which has not been experimentally investigated. Current models primarily relate RAC elastic modulus to its compressive strength. These models cannot describe the difference in the mechanisms of the influence of the incorporation of RCA on the concrete elastic modulus and that on the concrete strength. This paper first investigated how the compressive strength, static modulus of elasticity and shrinkage deformation of the RAC are influenced by the service time of the RCA (1, 18 and 40 years). The RCA was adopted as 0%, 30%, 50% and 100% replacement of the natural coarse aggregate. Based on two-phase composite material theory, the elastic modulus model was then developed for RAC which is related to the elastic modulus of the companion natural aggregate concrete by accounting for the influence of residual mortar content (CRM) to achieve a better accuracy in wider parameter ranges. The model to predict the development of the compressive strength over time was also proposed for the RAC by modifying the EC2 model. Results obtained indicated that RAC compressive strength was affected by the service time of the parent concrete, and the newly proposed models showed good accuracy in predicting RAC mechanical properties.
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Abbreviations
- CA:
-
Coarse aggregate
- COV:
-
Coefficient of variation
- ITZ:
-
Interfacial transition zone
- NAC:
-
Natural aggregate concrete
- NCA:
-
Natural coarse aggregate
- NFA:
-
Natural fine aggregate
- OVA:
-
Original virgin aggregate
- RAC:
-
Recycled aggregate concrete
- RCA:
-
Recycled coarse aggregate
- RM:
-
Residual mortar
- SSD:
-
Saturated surface-dried
- C RM :
-
Residual mortar content of recycled coarse aggregate (RCA)
- D NAC :
-
Density of aggregates in NAC
- D RAC :
-
Density of aggregates in RAC
- E NAC :
-
Static modulus of elasticity of NAC
- E NCA :
-
Static modulus of elasticity of NCA
- \(E_{\text{NCA}}^{\text{NAC}}\) :
-
Static modulus of elasticity of NCA in NAC
- \(E_{\text{NCA}}^{\text{RAC}}\) :
-
Static modulus of elasticity of NCA in RAC
- \(E_{\text{NM}}^{\text{NAC}}\) :
-
Static modulus of elasticity of natural mortar in NAC
- \(E_{\text{TM}}^{\text{RAC}}\) :
-
Static modulus of elasticity of natural mortar in RAC
- E RAC :
-
Static modulus of elasticity of RAC
- f cm(t), f cm :
-
Mean value of concrete compressive strengths at t and 28 days, respectively
- f cu150 :
-
Cubic compressive strength of concrete with dimensions of 150 mm
- r :
-
Replacement ratio of RCA
- s :
-
A coefficient according to the type of cement
- S NAC :
-
Total shrinkage of NAC
- S RAC :
-
Total shrinkage of RAC
- t :
-
Curing time of concrete
- \(V_{\text{NCA}}^{\text{NAC}}\) :
-
Volume fraction of NCA in NAC
- \(V_{\text{NM}}^{\text{NAC}}\) :
-
Volume fraction of natural mortar in NAC
- \(V_{\text{TNCA}}^{\text{RAC}}\) :
-
Total volume fraction of NCA in RAC
- \(V_{\text{TM}}^{\text{RAC}}\) :
-
Total volume fraction of mortar in RAC
- \(V_{\text{NCA}}^{\text{RAC}}\) :
-
Volume fraction of NCA in RAC
- \(V_{\text{OVA}}^{\text{RAC}}\) :
-
Volume fraction of OVA in RAC
- \(V_{\text{CA}}^{\text{RAC}}\) :
-
Volume fraction of CA in RAC
- Wa NAC :
-
Water absorption of aggregates in NAC
- Wa RAC :
-
Water absorption of aggregates in RAC
- w/c :
-
Water-to-cement ratio
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Acknowledgements
This study was funded by National Natural Science Foundation of China (51808351; 51678195), by Postdoctoral Research Plan of Heilongjiang (LBH-Q16098), by Open-funds of Key Lab of HIT (HITCE 201808; HITCE 201701), and by Liaoning Basic Scientific Plan (LJZ 2017021).
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Geng, Y., Wang, Q., Wang, Y. et al. Influence of service time of recycled coarse aggregate on the mechanical properties of recycled aggregate concrete. Mater Struct 52, 97 (2019). https://doi.org/10.1617/s11527-019-1395-0
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DOI: https://doi.org/10.1617/s11527-019-1395-0