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首页> 外文期刊>Magazine of Concrete Research >Passing ability and segregation stability of self-consolidating concrete with different aggregate proportions
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Passing ability and segregation stability of self-consolidating concrete with different aggregate proportions

机译：不同骨料配比的自密实混凝土的通过能力和偏析稳定性

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摘要

An extensive experimental programme has been carried out to study the effects of fine: 10 mm: 20 mm aggregate proportions on the passing ability and segregation stability of self-consolidating concrete. A total of 18 trial concrete mixes with water/cementitious materials ratios ranging from 0.30 to 0.36 and different combinations of fine and coarse aggregates were produced. In each mix, the paste volume was set at 35%, and pulverised fuel ash, condensed silica fume and a third-generation superplasticiser were added at dosages of 25%, 5% and 3% respectively. All the mixes were tested to have slump flow well above 700 mm. However, not all have satisfactory passing ability and segregation stability, as revealed by J-ring, U-box and sieve segregation tests. The cohesiveness and coarse aggregate content appeared to be the major factors as the passing ability and segregation stability were generally better for mixes with higher cohesiveness and lower coarse aggregate content. Nevertheless, some of the mixes may be considered for making high-strength, self-consolidating concrete. They have the common characteristics of 20 mm aggregate content ≤ 10 mm aggregate content and coarse aggregate content ≤ fine aggregate content.
机译：已经进行了广泛的实验计划，以研究细料：10 mm：20 mm骨料的比例对自密实混凝土的通过能力和偏析稳定性的影响。总共生产了18种试验混凝土混合物，水/胶凝材料的比率为0.30至0.36，并且细骨料和粗骨料的组合不同。在每种混合物中，浆料的体积设定为35％，并分别以25％，5％和3％的剂量添加粉状燃料灰，浓缩硅粉和第三代高效减水剂。测试所有混合物的坍落度都远高于700毫米。但是，并非所有的分离器都具有令人满意的通过能力和离析稳定性，如J形环，U形盒和筛子的离析测试所示。粘结性和粗骨料含量似乎是主要因素，因为对于具有较高粘结性和较低粗骨料含量的混合物，其通过能力和偏析稳定性通常更好。但是，可以考虑将某些混合料用于制备高强度，自固结的混凝土。它们的共同特征是骨料含量≤20 mm，骨料含量≤10 mm，粗骨料含量≤细骨料含量。

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