Concrete Literature Review

Words: 1676
Pages: 7

2.1 General

The literature review presents the current state of knowledge and examples of successful uses of alternative materials in concrete, and in particular the use of recycled aggregate as a coarse aggregate fraction in non-structural concrete. It also presents a review of available literature on recycled aggregate properties including particle size distribution, density and water absorption, and identifies the need to investigate porosity and possible chemical contamination of the aggregate.

2.2 A Detailed Literature Review

According to Rammamurthy and Gumaster (1998), the compressive strength of recycled aggregate concrete was relatively low and variation was depended on the strength of parent concrete from the obtained aggregate.
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There was no difference at the 5% significance level in concrete compressive and tensile strength of recycled concrete and control normal concrete made from natural aggregate.

In the same year, poon (2002) reported that there were not much effect of the compressive strength of brick specimens with the replacement of 25% and 50% of recycled aggregate. But when the percentage of recycled aggregate replacement increased, the compressive strength of the specimens was reduced.

Mandal, Chakarborty and Gupta (2002) also found that there will no effects on the concrete strength with the replacement of 30% of recycled aggregate. But the compressive strength was gradually decreasing when the amount replacement of recycled increased. They concluded that the properties and the strength characteristic of recycled aggregate concrete were deficient when compared to the specimens that made by the natural
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Mandal (2002) stated that application of fly ash in the recycled concrete aggregate had improved the durability of the recycled aggregate concrete.

Poon (2002) also mentioned that the use of fly ash could improve the strength characteristic of recycled aggregate. He stated that the compressive strength of concrete paving blocks was reached 49MPa at 28days by using fly ash.
Berry and Malhotra (1980) stated that for high strength concrete, fly ash functions by providing increased strength at late ages of curing (56 to 91 days) that cannot be achieved through the use of additional Portland cement.

Some precautions must be taken while using recycled aggregate in the concrete mixing.
According to Bodin and Zaharieva, the precautions must be taken was because of there were some pathological reactions such as alkali – aggregate reaction and sulphate reaction may be include in the performed characterisation of industrially produced recycled aggregate. They also mentioned that the mix proportioning of recycled aggregate concrete must be suited when both fine and coarse recycled aggregate were substituted for natural aggregate.

2.3 Reviews on Recycled