Abstract
Utilization of waste aggregates for construction industry had been encouraged in line with increasing pressures to reduce exploration of natural aggregates. One alternative material that can be used as masonry block unit is the construction demolition waste (CDW) with asphalt as the binder (CDW block). The objective of this paper is to produce CDW block with a performance equal to the concrete block commonly used in the United Kingdom with a compressive strength between 3.5 Mpa and 7 MPa and the specific creep strain less than 100 microstrain. The CDW block requires suitable particle size proportion, in order to obtain satisfactory results and to meet the demand of using minimum bitumen content and low compaction level. The CDW block requires sufficient heat curing to harden the asphalt. It was found that CDW materials were a very suitable material to be used for making CDW blocks. Compaction level of 2 MPa and curing regime of 200°C for 24 hours were sufficient and gave satisfactory results.
Highlights
Demand on aggregates for construction industries world wide continues to increase
The Initial Rate of Suction (IRS) values of the CDWblock were found somewhat lower than the range of IRS values for clay brick found in the United Kingdom
Low IRS values were obtained because the aggregates were evenly coated by asphalt which has hydrophobic character
Summary
Demand on aggregates for construction industries world wide continues to increase. Aggregate demand of the United Kingdom (UK) raise from a level of 270 million tonnes in 1989, to a predicted demand of 420490 million tonnes by 20111. There has been increasing pressures to reduce exploration of natural aggregates. This situation encourages the utilization of waste and secondary aggregate materials for construction industry. 160,000 new homes are built each year in the UK of which 90 percent are constructed from masonry. Requires approximately 200m2 of building block work resulting in approximately 350 million blocks being manufactured each year. Waste or by product materials such as steel slag, crushed glass, and coal fly had been incorporated into masonry building blocks[2]
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