Results and Discussions. Compressive strength was increased moderately for both type crushed aggregates with the decrease of w/c ratio. For A1 coarse aggregate, lower compressive strength (14 MPa) was recorded for GroupI and higher compressive strength (33 MPa) was for GroupV at 1 .
aggregate (or crushed bricks) are mixed in dry state by hand and then the required quantity of water is added and mixed thoroughly. Before casting, machine oil is smeared on the inner surfaces of the cast iron mould. is poured into the mould in three layers and compacted .
Size effect and strength correction factors 61 2 Proposed model The shear models consider two main types of failure in concrete members. These are either sliding or crushing. The compression field models assume the concrete crushes at a stress that is some fraction of the concrete compressive strength (Collins 1978, Muttoni et al 1997).
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Comparison between recycled concrete aggregate and Table 2 crushed clay Properties of recycled concrete aggregates Properties Aggregate size Test method The density, measured in accordance with BS 812 10 mm < 5 mm Part 2 , of the recycled concrete aggregate was higher DensitySSD (kg/m3) 2580 2310 BS 812 Part 2 than that of the crushed clay .
Aggregate crushing value test on coarse aggregates gives a relative measure of the resistance of an aggregate crushing under gradually applied compressive load. Coarse aggregate crushing value is the percentage by weight of the crushed material obtained when test aggregates are subjected to a specified load under standardized conditions.
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aggregates are used. To conclude, all parameters remaining identical, concrete compression strength will be higher for concrete made using fine aggregates having lesser finer fines, aggregates having maximum aggregate size, aggregates having rounded shape and/or .
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of aggregate increased at the same water/cement ratio. The presence of clay, silt, crush dust and all forms of over coating was also judged as deterrent to the development of aggregatecement bonds and this brings about reduction in the strength of concrete. Chen and Liu, 2004  as well as Rao and Prasad,
Two aggregates were crushed from unused bricks, one recycled aggregate (RBA) and the other, granite aggregate; and the properties compared with each other.
Concrete recycling is becoming an increasingly popular way to utilize aggregate left behind when structures or roadways are demolished. Concrete recycling allows for the reuse of the rubble while also keeping construction costs down. It is a cost effective alternative for stone base material.