クリープ・収縮

[V-493] Study on mix proportion of high strength mortar for precast concrete using shrinkage reducing admixture

*川西 貴士¹、平田 隆祥¹、高橋 敏樹¹、西 祐宜² (1. 株式会社大林組、2. 株式会社フローリック)

Keywords:Precast Concrete, High Strength Mortar, Shrinkage Reducing Admixture, Limestone Crushed Sand, Autogeneous Shrinkage, Drying Shrinkage

Mix proportion of high strength mortar was studied for large-sized thin-walled precast concrete. As a result of conducting various tests on a high strength mortar using a shrinkage reducing admixture, the following was confirmed. With the increase of the mixing dosage of the shrinkage reducing admixture, the initial setting was delayed and the compressive strength was decreased and both the autogeneous shrinkage and the drying shrinkage are reduced. In this paper, the shrinkage strain could be suppressed the same level as general concrete and the mix proportion for producing crack free precast concrete was shown.