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首页> 外文期刊>Magazine of Concrete Research >Thixotropy of self-compacting concrete containing recycled aggregates
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Thixotropy of self-compacting concrete containing recycled aggregates

机译：包含再生骨料的自密实混凝土的触变性

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The effect of recycled-concrete aggregate replacement level and binder composition on the thixotropy of two grades of self-compacting concrete (SCC) was investigated with a coaxial rheometer using the stress-growth test. Across the two SCC grades, the binder composition was changed while keeping the aggregate and paste volumes constant. Within a grade, the coarse aggregate composition was varied and the degree of thixotropy was found to increase with an increase in recycled aggregate replacement level (by volume) to 50% and 100%. This was attributed to the higher internal friction associated with the recycled aggregates. Enhanced thixotropy was noted in the mixes containing supplementary cementitious materials, with metakaolin being more effective than silica fume in this regard. Measurements of the drop in apparent viscosity yielded predictions for the degree of thixotropy that were comparable to those obtained from the breakdown area associated with a typical stress-growth test.
机译：使用同轴流变仪，通过应力增长试验研究了再生混凝土骨料替代水平和粘结剂组成对两种等级的自密实混凝土（SCC）触变性的影响。在两个SCC等级中，改变了粘合剂的组成，同时保持了骨料和浆料的体积恒定。在一个等级内，粗骨料的组成有所变化，并且触变性的程度随再循环骨料替代量（按体积计）增加到50％和100％而增加。这归因于与再生骨料相关的更高的内部摩擦。在含有补充胶结材料的混合物中，触变增强，在这方面偏高岭土比硅粉更有效。表观粘度下降的测量产生了触变程度的预测，该预测与从与典型应力-增长试验相关的破坏区域获得的预测相当。

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