The Influence of Fine Particle Contents in Limestone Coarse Aggregate on the Properties of High-strength Concrete
By K. Hayashi, K. Tada, K. Yamada and H. Kawano
Concrete Journal, Vol.49, No.12, Dec. 2011
- Synopsis
- This technical report discusses the influence of increase in fine particle contents from 1.0 mass% to 5.0 mass% in limestone aggregate on the fresh and hardened properties of high-strength concrete based on significant size of experiments considering varieties of aggregate sources, cement types, and water to cement ratios. This study was carried out corresponding to the change of the regulation on fine particles contents in crushed aggregate in JIS A 5005-2009. Although the increase in fine particle content decreases fluidity in some degree, it can be compensated by the increase in the dosage of superplasticizer in realistic range such as 10%. Regarding other properties such as air content, compressive strength, and the elastic modulus, no significant effects were detected. Thus, the effect of the increase in fine particle content in limestone aggregate is judged as negligible in the range of this study, it can be concluded that it is possible to use limestone aggregate as usual before just after a simple confirmation examination of typical concrete properties even when the fine particle contents increases.
- Keywords:
- limestone aggregate, fine particle contents, high-strength concrete, fresh properties, hardened properties
