Improvement in Self-compacting Properties of Fresh Concrete by Eliminating Large Air Bubbles using an Antifoaming Agent
Improvement in Self-compacting Properties of Fresh Concrete by Eliminating Large Air Bubbles using an Antifoaming Agent
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DOI：
10.3151/jact.15.10
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发表时间：
2017-01
影响因子：
2
通讯作者：
M. Ouchi;Kenta Kameshima;Anuwat Attachaiyawuth
中科院分区：
文献类型：
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作者：
M. Ouchi;Kenta Kameshima;Anuwat Attachaiyawuth
研究了两种去除大气泡以增加小气泡百分比的程序的有效性，通过在混合过程中添加消泡剂，这有望有效提高新拌混凝土的自密实性能。在通过分水混合夹带许多小气泡后使用消泡剂去除的方法中，在所调查的所有情况下，即与一次水同时添加消泡剂、与二次水同时添加消泡剂、最后添加消泡剂，均不能去除大直径气泡，反而增加了气泡。另一方面，在夹带大量气泡后混合除去并最后添加消泡剂的方法中，如果增加引气剂的量，则可以增加小直径气泡的百分比，并且可以减少大直径气泡的百分比。
The effectiveness of two types of procedure for removing large air bubbles in order to increase the percentage of small air bubbles, which is envisaged to be effective for improving the self-compacting properties of fresh concrete, by the addition of an antifoaming agent during mixing has been investigated. In the method of removal using an antifoaming agent after entraining many small air bubbles by divided water mixing, in all the cases investigated, namely adding antifoaming agent at the same time as the primary water, adding antifoaming agent at the same time as the secondary water, and adding antifoaming agent finally, it was not possible to remove large diameter air bubbles, on the contrary they increased. On the other hand, in the method of removing by mixing all together and adding the antifoaming agent finally after a large quantity of air bubbles has been entrained, if the quantity of air entraining agent is increased, the percentage of small diameter bubbles is increased, and the percentage of large diameter bubbles can be reduced.