Study on the Slump Loss Mechanism of Concrete and the Redacting Method

由于新拌混凝土的和易性随着时间的推移而下降，制约了施工。因此，不仅要提高可加工性，而且要进行维护。在中高强度混凝土中掺入高效减水剂可达到降低坍落度损失的效果。然而，在贫配合比混凝土的情况下，这种效果很难得到。此外，贫配合比混凝土可以认为混凝土的流动性受到掺水条件的影响。研究表明，通过提高混凝土的持水性能可以减少坍落度损失。提出了同时使用增稠剂和AE减水剂降低贫混混凝土坍落度损失的方法。

Since the workability of fresh concrete falls with time progress, it restricts construction. Therefore, not only the improvement in workability but maintenance is also necessary. Middle/high-strength concrete can obtain the slump loss reduction effect by using super plasticizer. However, in the case of lean mix proportion concrete, this effect is hardly obtained. Moreover, lean mix proportion concrete can be thinking that the fluidity of concrete has been influenced by the condition of mixing water. In this research, it showed clearly to be able to reduce slump loss by raising the water holding property of concrete. The way method for the ability to reduce the slump loss of lean-mix concrete by using both thickening agent and AE water reducing agent was proposed.