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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) >INCREASE OF SCC ROBUSTNESS TO VARYING AGGREGATE MOISTURE CONTENT USING VMA
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INCREASE OF SCC ROBUSTNESS TO VARYING AGGREGATE MOISTURE CONTENT USING VMA

机译：使用VMA增加SCC刚度以改变聚集的水分

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摘要

SCC is often sensitive to variations of constituent materials, and this lack of robustness is one of the main obstacles preventing SCC from becoming the mainstream cast-in-place concrete. This fact leads to substantially greater quality assurance requirement during production, increased need for manpower, and in some cases, the possibility of disrupted logistics due to rejected batches. Thus, in many cases, SCC is found to be unnecessarily costly and unreliable.The project was split into three stages, of which the first focused on mieromortar rheology,where aggregate moisture content was found to be the most important parameter affecting rheology. The second stage involved rheological measurements of concrete-equivalent mortar,based on tests conducted using different VMA types, some of which were found to increase robustness. In the third and final stage, SCC was the main focus, and here, the best performing VMAs from stage 2 were evaluated in terms of robustness relative to fresh properties. Results show that robustness can indeed be achieved using VMA, but most strikingly when the aggregate moisture content is underestimated, i.e., when the total amount of water is higher than in the mix design. It is also evident that relatively low dosages of VMA are needed to increase robustness, which is favorable in terms of relatively lower superplasticizer demand.
机译：SCC通常对组成材料的变化敏感，而缺乏坚固性是阻止SCC成为主流现浇混凝土的主要障碍之一。这一事实导致生产过程中对质量保证的要求大大提高，对人力的需求增加，在某些情况下，由于批次不合格而导致物流中断的可能性。因此，在许多情况下，发现SCC不必要地昂贵且不可靠。该项目分为三个阶段，其中第一个阶段集中在微砂浆流变学上，在该阶段中，总含水量是影响流变学的最重要参数。第二阶段涉及到混凝土等效砂浆的流变学测量，基于使用不同VMA类型进行的测试，发现其中一些可以提高坚固性。在第三个也是最后一个阶段，SCC是主要焦点，在这里，从相对于新鲜特性的鲁棒性方面评估了阶段2中性能最佳的VMA。结果表明，使用VMA确实可以实现鲁棒性，但最令人惊讶的是，当总水分含量被低估时，即，当水的总量高于混合设计中的水分含量时。同样明显的是，需要相对低剂量的VMA以增加坚固性，这在相对较低的减水剂需求方面是有利的。

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