TY - JOUR
T1 - Properties of pervious concrete incorporating recycled concrete aggregates and slag
AU - El-Hassan, Hilal
AU - Kianmehr, Peiman
AU - Zouaoui, Souhail
N1 - Funding Information:
This project is supported by the United Arab Emirates University (UAEU) [grant number 31N322] and the School of Engineering at the American University in Dubai (AUD). The contributions of the UAEU and AUD laboratory staff are greatly appreciated.
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/7/10
Y1 - 2019/7/10
N2 - The properties of pervious concrete made with recycled concrete aggregates (RCA) were investigated. Natural aggregates were replaced by RCA at levels of 0, 10, 20, 40, 70, and 100%. Slag was also incorporated to enhance the performance and sustainability of the concrete mixtures. Slump, hardened density, total void content, porosity, permeability, compressive strength, tensile splitting strength, flexural strength, and abrasion resistance were determined. Results showed that the RCA replacement led to an increase in total void content, porosity, and permeability, while a decrease in slump and hardened density was noted. The mechanical properties and abrasion resistance were adversely affected due to the weak RCA and aggregate-mortar interface. The clogging potential of pervious RCA concrete was also assessed over a simulated 20-year lifespan. Permeability could be restored to acceptable, but lower, levels through pressurized water washing. RCA limited the restoration of permeability of pervious concrete, while slag facilitated it. Analytical models were developed to correlate physical, transport, mechanical, and durability properties. Codified equations were assessed for their applicability. Experimental findings highlight the ability to use pervious RCA concrete in pavement applications.
AB - The properties of pervious concrete made with recycled concrete aggregates (RCA) were investigated. Natural aggregates were replaced by RCA at levels of 0, 10, 20, 40, 70, and 100%. Slag was also incorporated to enhance the performance and sustainability of the concrete mixtures. Slump, hardened density, total void content, porosity, permeability, compressive strength, tensile splitting strength, flexural strength, and abrasion resistance were determined. Results showed that the RCA replacement led to an increase in total void content, porosity, and permeability, while a decrease in slump and hardened density was noted. The mechanical properties and abrasion resistance were adversely affected due to the weak RCA and aggregate-mortar interface. The clogging potential of pervious RCA concrete was also assessed over a simulated 20-year lifespan. Permeability could be restored to acceptable, but lower, levels through pressurized water washing. RCA limited the restoration of permeability of pervious concrete, while slag facilitated it. Analytical models were developed to correlate physical, transport, mechanical, and durability properties. Codified equations were assessed for their applicability. Experimental findings highlight the ability to use pervious RCA concrete in pavement applications.
KW - Analytical models
KW - Clogging potential
KW - Durability performance
KW - Mechanical properties
KW - Permeability
KW - Pervious concrete
KW - Recycled concrete aggregate
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U2 - 10.1016/j.conbuildmat.2019.03.325
DO - 10.1016/j.conbuildmat.2019.03.325
M3 - Article
AN - SCOPUS:85063694412
SN - 0950-0618
VL - 212
SP - 164
EP - 175
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -