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首页> 外文会议>第二届自密实混凝土设计、性能及应用技术国际研讨会(2nd International Symposium on Design,Performance and Use of Self-Consolidating Concrete SCC'2009-China) >EVALUATION OF THE CEMENT PASTE THIXOTROPY
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EVALUATION OF THE CEMENT PASTE THIXOTROPY

机译：水泥浆触变评价

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摘要

The use of most recent admixtures enables to cast highly fluid concrete placed without vibration. However this type of concrete remains relatively difficult to formulate properly.When fluidity is too high, the homogeneity of the concrete is adversely affected due to a granular sorting phenomenon called segregation: a too much fluid cement paste results in the settling of the granular skeleton (coarse aggregates) and rising of the fluid matrix to the surface. By providing additional resistance to prevent particles from segregating, thus enhancing the stability of the cement - based materials, the thixotropy is of particular interest in the field of civil engineering.To have a more accurate study of the rate of internal structural breakdown, the present study proposes a semi-empirical procedure comparing systems with different viscosities. For this approach, tests were conducted on SCC pastes. Results suggest different critical dosage of VMA. To obtain the greatest thixotropy of the mixture, a maximum value of VMA dosage appears. Beyond this value, the tridimensional networks of these more concentrated mixtures are highly structured and thus more difficult to deform by agitation.
机译：使用最新的外加剂可以浇铸高流动性的混凝土而不会振动。然而，这种类型的混凝土仍然相对难以正确配制。当流动性太高时，由于称为分凝的颗粒分选现象而对混凝土的均质性产生不利影响：流动性过多的水泥浆会导致颗粒状骨架沉降（粗骨料）和流体基质上升到表面。通过提供额外的抵抗力来防止颗粒离析，从而增强水泥基材料的稳定性，触变性在土木工程领域特别受关注。为了更准确地研究内部结构的破坏速率，本发明这项研究提出了一种比较不同粘度系统的半经验程序。对于这种方法，对SCC浆料进行了测试。结果表明VMA的临界剂量不同。为了获得混合物的最大触变性，VMA剂量出现最大值。超过此值，这些更集中的混合物的三维网络具有高度结构化，因此更难以通过搅拌变形。

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