Abstract
Use of recycled concrete aggregate (RCA) is getting importance as it minimizes the use of fresh materials and eliminates waste disposal. One of the uses of RCA is as aggregate in Controlled Low Strength Material (CLSM). This paper reports the results of the investigation done on the use of RCA in CLSM. Various mixtures of CLSM were made using RCA, fly ash, and cement. Tests for workability, bleeding, density, strength, water absorption, sorption, and ultrasonic pulse velocity (UPV) were conducted. Results show that the compressive strength ranged from 1.71 MPa to 4.92 MPa, fresh density from 1879 kg/m3 to 1998 kg/m3. The strength of CLSM increases with the increase in fly ash; water absorption and bleeding decrease with increase in fly ash. It is concluded that the RCA has potential to be used in CLSM and the addition of fly ash enhances the performance.
Highlights
As defined by American Concrete Institute ACI Committee 229, Controlled Low Strength Material (CLSM) is a self compacting cementitious material that is in a flowable state at the time of placement and has specified compressive strength of 8.3 MPa or less at the age of 28 days [1]
The primary advantage of CLSM is its ability to consume large volume of waste materials which will contribute to sustainability
The fresh density values of CLSM mixes made with bottom ash were in the range of 1528–1560 kg/m3
Summary
The primary advantage of CLSM is its ability to consume large volume of waste materials which will contribute to sustainability. Many waste materials such as bottom ash from industrial waste, glass, quarry fines etc. A total of 11000 m3 of concrete, in which 20% of the coarse aggregates were replaced by recycled aggregates, were used in all parts of the structures. The Recycled Concrete Aggregate (RCA) can be potentially tried as CLSM applications. This will enable the use of wastes whereby increasing the Green Building Index (GBI) values of buildings. Received 11 August 2011; revised 17 November 2011; accepted 05 February 2012
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