TITLE:
Study of the Mechanical Performance of a Recycled Aggregate Concrete with Admixture Addition
AUTHORS:
Larbi Belagraa, Miloud Beddar
KEYWORDS:
Recycled Concrete Aggregate; Demolition Waste; Non-Destructive Tests; Mechanical Strength; Admixture
JOURNAL NAME:
Open Journal of Civil Engineering,
Vol.3 No.2,
June
4,
2013
ABSTRACT: The needs of the construction sector are still
increasing for concrete. However the shortage of natural resources of aggregate
could be a problem for the concrete industry. In addition, the negative impact
on the environment is due to the construction demolition; where disposal wastes
create a severe ecological and environmental hazard. In the last decade, a
major interest has been developed for the reuse of recycled aggregates that
present more than 70% of the concrete volume. The reused products should
fulfill the requirements of lower cost and better quality, in order to
establish its role in the concrete. The aim of this study is to assess the effect
of the local admixtures on the mechanical behavior of recycled aggregate
concrete (RAC). Physical and mechanical properties of RAC were investigated
including density, compressive and flexural strength. The non-destructive
test methods (NDT: pulse-velocity and rebound hammer) were used to determine the
concrete strength. The results obtained were compared with crushed aggregate
concrete (CAC) using the normal compressive testing machine test method. Thus,
the convenience of indirect tests in the case of a recycled aggregate concrete
were demonstrated.