Influence of Aggregate Type on Properties of Geopolymer Concrete

Abstract

The results of comparative studies of geopolymer concrete strength made with coarse aggregate based on granite, limestone, concrete scrap were given. It is found that the use of granite aggregate instead of limestone and concrete scrap reduces the strength flexural 2-2.5 times, as on impact - 2.5-3.5 times; the compressive strength decreases by 10-30%. It concluded that the main item that reduces the strength of the investigated geopolymer concrete when using granite aggregate, its low creep is observed, which, with high autogenous shrinkage of the geopolymer binder, leads to concrete cracking. The established features of the influence of the type of aggregate on the properties of concrete substantiate the use of crushed limestone and concrete scrap as a coarse aggregate of geopolymer concrete.