In this study, utilization of coal fly ash with higher loss on ignition (LOI) for geopolymer mortar was investigated. The fly ash with approximately 9% of LOI was compared with Class F fly ash. Relationship between heat curing condition and strength was clarified. As the results, although compressive strength of geopolymer mortar with higher LOI was 30-50% smaller, it was available for geopolymer mortar as an alumina silicate material. The higher temperature and the longer period for initial curing, the higher strength was obtained. In order to decrease drying shrinkage, the higher temperature and the longer period for heat curing were required.
The thin wall of a pre-stressed concrete LNG storage tank is very intricate with many reinforcing bars, sheaths and other steels, and it is very difficult to fill it up with concrete. So, for the construction of the wall of the structure, it is compeled to apply the inverse casting method by using high performance concrete, which has high strength, high endurance, high workability and non shrinkage.This report describes the results of the experimental study on a high performance concrete and its practical use to actual structures, in order to find the details as followings:(1) The limit of the unit coarse aggregates upon filling capacity of concrete.(2) The effect of low heat type cement upon controlling thermal stress.(3) The effect of expansive admixture and aluminium powder upon volume stability.
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