Strength Development and Autogenous Shrinkage of High-Flow Concrete with Limestone Powder
Hiroyoshi KATO, Akinori NAKAMURA, Hiroyuki DOI and Toyoaki MIYAGAWA
Abstract:The influence of limestone powder content on setting, strength and autogenous shrinkage of high-flow concrete were discussed. Ordinary Portland Cements were used with additions of 0,10,20 and 30wt% limestone powder. Setting of concrete was accelerated by additions of limestone powder. Strength decreased with the additions of limestone powder, but a slight decrease of compressive strength was found with addition of 10wt%. Compressive strength of concrete increased linearly with decreasing the porosity with or without additions of limestone powder. Autogenous shrinkage decreased with increasing the additions of limestone powder in the early stage, but kept increasing for long time with limestone powder. It was suggested that the increase of autogenous shrinkage due to additions of limestone powder in the long stage related to Monocarbonate. Key Words:High-flow concrete, Limestone powder, Polycarboxllate-based superplasticizer, Setting time, Compressive strength, Tensile strength, Autogenous shrinkage, Monocarbonate