Civil Engineering
Utilization of cement treated recycled concrete aggregates as base or subbase layer in Egypt

https://doi.org/10.1016/j.asej.2013.02.005Get rights and content
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Abstract

Recently, environmental protection has a great concern in Egypt where recycling of increased demolition debris has become a viable option to be incorporated into roads applications. An extensive laboratory program is conducted to study the feasibility of using recycled concrete aggregate (RCA) mixed with traditional limestone aggregate (LSA) which is currently being used in base or subbase applications in Egypt. Moreover, the influence of mixture variables on the mechanical properties of cement treated recycled aggregate (CTRA) is investigated. Models to predict the compressive and tensile strengths based on mixture parameters are established. The results show that the adding of RCA improves the mechanical properties of the mixture where the unconfined compressive strength (UCS) is taken as an important quality indicator. Variables influencing the UCS such as cement content, curing time, dry density play important roles to determine the performance of CTRA.

Abbreviations

CBR
California bearing ratio
CTRA
cement treated recycled aggregate
FS
flexural strength
ITS
indirect tensile strength
LSA
limestone aggregate
MDD
maximum dry density
Mr
resilient modulus
OMC
optimum moisture content
Pdr
plastic deformation ratio
PI
plastic index
RCA
recycled concrete aggregate
UCS
unconfined compressive strength.

Keywords

Recycled concrete
Cement treatment
Tensile strength
Compressive strength
Resilient modulus
Base aggregate

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Ahmed Ebrahim Abu El-Maaty Behiry is a Lecturer in the department of Civil Engineering, Faculty of Engineering, Shebin El-Kom, Menoufia University, Egypt. He received his Ph.D. in Civil Engineering from Menoufia University, Egypt., in 2007. His fields of interest include highway structure design, consistency of soil reinforcement, concrete pavement, finite elements analysis, fundamentals of geotechnical engineering and traffic performance analysis.

Peer review under responsibility of Ain Shams University.

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