Abstract
This research deals with the behavior of recycled aggregate concrete (RAC). In this study an experimental work was undertaken. The study examines the effect of using recycled coarse aggregate (RCA) on the workability and the mechanical performance of RAC. The influences of using silica fume (SF) as cement replacement material on the performance of RAC were also examined. Silica fume was used at four contents (5%, 10%, 15% and 20%). The total number of mixes was six. Four mixes of RAC made with these four contents of SF, one RAC mix was made without SF and one mix was made with natural coarse aggregate (NCA) as a reference mix. The outcomes of this study reveal that workability and mechanical performance of RAC are lower than that made with NCA. Also, Silica fume has an adverse influence on workability of the RAC. However, the silica fume possesses a positive influence on mechanical properties of RAC. Silica fume can be used at contents of (10-20)% of cement mass to obtain mechanical performance for the RAC comparable to the concrete includes NCA.
Highlights
Concrete is a constructional material which has been utilized in construction industry for more than one century [1]
Compared to the slump value of mix SF0, mixes RSF5, RSF10, RSF15 and RSF20 exhibited lower slump values by 18%, 27%, 39% and 50%, respectively. This behavior is caused by high surface area of silica fume which demands high quantity of water to maintain the workability of the concrete [9]
The compressive strength of the mix NSF0 decreased form 38.8 MPa to 27.7 MPa when the natural coarse aggregate (NCA) was replaced with recycled coarse aggregate (RCA)
Summary
Concrete is a constructional material which has been utilized in construction industry for more than one century [1]. Concrete has been accused for the high amount of emitted CO2 during the process of its production including cement manufacturing, aggregate extraction and transportation This emission causes sustainability concerns and environmental issues [1] [2]. Another environmental problem which is related to the industry of construction is the accumulation of huge amounts of construction and demolition waste (CDW) Nowadays, such issues and concerns are recognized at the level of globe. The use of such materials can greatly help in reducing consumption of cement which in turn may substantially contribute to reduce the environmental related issues Another way is the reuse or recycle of CDW to be used as fine or coarse aggregates instead of traditional aggregate. This is very helpful in conserving our environment [5] [6]
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