Viscosity of high flowing concrete is an important rheological property that dominates the flowabilty of concrete. Supposing that the mix proportion and slump flow of concrete are constant, the viscosity varies with the temperature of concrete and influences on the segregation or rate of placing of fresh concrete. In this study, the influence of temperature on rheological property of cement paste in high flowing con
Fishing port facilities are the main coastal structures in fishery area forming large stocks for which a considerable degradation is concerned. Introduction of the stock management capable of reducing the life cycle cost and enhancing the life and durability of the existing structures is expected. This paper discusses the future prospects and problems with the stock management when applied to the fishing port on the basis of the actual operations. For a smooth introduction of the stock management to the fishing port facilities, a series of systematic measures are introduced including accumulation/utilization of the surveillance data, appropriate diagnosis of the degradation, rational prediction/countermeasures for the degradation , and estimation/yearly stabilization of the LCC .
At very early ages, plastic shrinkage is one of the causes of cracking of concrete. It has been believed that the plastic shrinkage of cementitious material occurs when the water drying rate from the surface is larger than bleeding rate. However, in recent studies, it was reported that negative pressure may occur due to hydration, without drying, in high-strength concrete with a low water-binder ratio. This suggests that the volume change of cementitious material at very early ages is influenced not only by drying from the surface but also by self desiccation due to hydration. The purpose of this study is to clarify the effects of water-binder ratios, volume fraction of fine aggregates and curing conditions on volume change of cement paste and mortar at very early ages. Effect of each factor on volume change of cement paste and mortar was investigated through experiments on the change in pore water pressure and the shrinkage behavior at very early ages. It was found that volume change of cement paste and mortar at very early ages was markedly influenced by self desiccation as well as by drying when the water-binder ratio is low.
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