Abstract
Used of recycled aggregate (RA) in concrete can be described in environmental protection and economical terms. The application of recycled aggregate to use in construction activities have been practice by developed European countries and also of some Asian countries. This paper reports the results of an experimental study on the mechanical properties of recycled aggregate concrete (RAC) as compared to natural aggregate concrete (NAC). The effects of size of RA on compressive strength were discussed in this paper. The 100% of RA used in concrete mix to replace the natural coarse aggregate in concrete with 100 x 100 x 100 cube mm were cast with target compressive strength is 25 MPa. The 28-day compressive strength was crushed at 3, 14, 28 days are reported. It was found the size of 10mm and 14 mm of RA in RAC is quite similar performance with 10mm and 14mm size of natural aggregate (NA) in natural aggregate concrete (NAC).Keywords: Concrete, Recycled aggregate properties, performance of recycled aggregate concrete.
Highlights
Reasons for these are because of factors like smooth texture and rounder shape of recycled aggregate (RA), higher percentage of fine particles and high water absorption (Olorusongo, F.T., 1999)
Recycled aggregate can be generated from demolished construction structure which comprises of broken members or components likes the slab, beam, brick wall and others
It can be concluded that: 1) The 28-day target compressive strength for all six mixes was achieved to 25 MPa even though the recycled aggregate concrete (RAC) strength is lower than natural aggregate concrete (NAC)
Summary
Recycled aggregate can be generated from demolished construction structure which comprises of broken members or components likes the slab, beam, brick wall and others. Since the quality data of these broken materials are often unknown, such as water cement ratio, kind of admixtures, aggregate origins and gradations, as well as the differentiation of its properties during the performance time, it should refer to historical data of the components, physical characteristics, mechanical characteristics and environmental characteristics The study of the properties of recycled aggregates and the basic properties of recycled concrete has been on going over the last few decades, leading a number of countries recommendations their use. The properties of RA are evaluated according to BS 812:1990, which require performing several tests that include (i) flakiness and elongation, (ii) water absorption and specific gravity, (iii) aggregate crushing value and aggregate impact value
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