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Study on mechanism of strength distribution development in vacuum-de watered concrete based on the consolidation theory

机译:基于固结理论的真空脱水混凝土强度分布发展机理研究

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The strength and hardness of a concrete slab surface are considered to be significantly affected by concrete bleeding. Vacuum dewatering is reported to be quite effective in imparting high density and strength. However, in Japan, in contrast with concrete work in civil engineering applications, concrete work in the field of building construction has not been successfully treated by this method. In an earlier report, the authors pointed out the strong relationship between strength distribution and density distribution in vacuum-dewatered concrete, both of which gradually decrease from the top surface to a depth of about 15 cm. The main purpose of the present study is to discuss the mechanism of the occurrence of suchrndistribution of strength and density, based on consolidation theory. In an experiment, pore water pressure distribution in concrete is measured by means of an original measuring system. The results of the experiment confirm that the consolidation theory is quite effective in explaining the internal properties of vacuum-dewatered concrete as well as those of press-dewatered concrete. A prediction method for the strength improvement of concrete by vacuum dewatering is also discussed. It was considered likely that pore water pressure distribution generated by vacuum dewatering could be attributable to the influences of capillary tension and viscous resistance. This mechanism was verified by model experiment.
机译:混凝土板表面的强度和硬度被认为受混凝土渗漏的影响很大。据报道真空脱水在赋予高密度和强度方面非常有效。然而,在日本,与土木工程应用中的混凝土工作相反,建筑方法领域的混凝土工作尚未通过这种方法成功地进行处理。在较早的报告中,作者指出了真空脱水混凝土中强度分布与密度分布之间的密切关系,二者均从顶表面逐渐减小到约15 cm的深度。本研究的主要目的是基于固结理论探讨强度和密度的这种分布发生的机理。在实验中,借助于原始的测量系统来测量混凝土中的孔隙水压力分布。实验结果证实,固结理论在解释真空脱水混凝土以及压榨脱水混凝土的内部性能方面非常有效。讨论了一种通过真空脱水提高混凝土强度的预测方法。人们认为,真空脱水产生的孔隙水压力分布可能归因于毛细管张力和粘性阻力的影响。通过模型实验验证了该机理。

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