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The research on the evaluation and improvement method of pumpability of the high-fluidity concrete with the self-compacting ability of Rank 1

1级自密实高流动混凝土泵送性评价及改进方法研究

基本信息

批准号：
15560395
负责人：
HASHIMOTO Chikanori
金额：
$ 2.37万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

A purpose of this study is to establish the evaluation and improvement method of pumpability of the high-fluidity concrete with the self-compacting ability of Rank 1.In this research project, the experimental tests have been conducted to take the new indexes for evaluation and improvement of pumpability of the high-fluidity concrete in two series as followed : A) Field pumping test through the circulated pipeline in 2003, B) Laboratory Tests by using the test method for deformability of fresh concrete in 2004. The objective of the field test was to measure the pressure loss of-fresh concrete flowing through the circulated pipeline by the actual concrete pumping on site. The exchanged horizontal conveying distance was about 59.5m. In this field test, the state of concrete in pumping was carried out from stable state to blocking state. The number of pressure gage was seven. Normal concrete having the slump of 18cm and the high-fluidity concrete with type IV of fly ash having the self-com … More pacting ability of Rank 1 were used in this field test. The objective of the laboratory tests was to examine whether the variation of the pressure of fresh concrete i s quantitative index of segregation resistance to pulsatile flow using a pumping tester. In this laboratory tests, the mix proportions and materials of the two concrete were same as those of the concretes in the files test. The fol lowing were concluded from the experimental work.(1) Pulsatile flow was generated as actual pumping by controlling move and stop of piston of pumping tester which used in test method of deformabi I i ty of the high - fluidity concrete with the self-compacting ability of Rank 1.(2) The comparison between test method of deformabi I i ty during pu l sat i l e flow and actual pumping in case of normal concrete, pressure loss of test method of deformabi I i ty is higher than pressure loss of actual pumping. So test method of deformability is considered to be safe in case of normal concrete. On the other hand, pressure loss of test method of deformability is lower than pressure loss of actual pumping in case of the high-fluidity concrete with the self-compacting ability of Rank 1 with high viscosity. Less

本研究旨在建立具有1级自密实能力的大流动性混凝土可泵性评价与改善方法。本研究项目分两个系列进行了高流动性混凝土可泵性评价与改善新指标的试验研究：A)2003年的现场循环管道泵送试验；B)2004年采用新拌混凝土变形性试验方法进行的室内试验。现场试验的目的是通过现场实际泵送混凝土来测量新拌混凝土流经循环管道的压力损失。交换水平输送距离约为59.5m。在本次现场试验中，混凝土的泵送状态由稳定状态变为堵塞状态。压力表的数量是七个。坍落度为18 cm的普通混凝土和自掺…的IV型高流动性混凝土本次田间试验采用了较多的第1级起搏能力。室内试验的目的是用泵送试验机检验新拌混凝土压力的变化是否符合S离析的定量指标抗脉动流。在本次室内试验中，两种混凝土的配合比和材料与档案试验中混凝土的配合比和材料相同。(1)通过控制泵送试验机活塞的运动和停止，产生脉动流作为实际泵送，该泵送试验机用于具有等级1的高流动性混凝土的变形性试验方法。(2)在普通混凝土情况下，Pu-L坐L试验方法的变形性试验方法与实际泵送时的压力损失比较，变形性试验方法的压力损失大于实际泵送的压力损失。因此，对于普通混凝土来说，变形能力的测试方法是安全的。另一方面，对于具有1级自密实能力的高粘度高流动性混凝土，变形能力试验方法的压力损失小于实际泵送的压力损失。较少