骨料裹浆厚度对混凝土流变性能的影响

发布时间：2018-01-07 23:19

本文关键词：骨料裹浆厚度对混凝土流变性能的影响　出处：《硅酸盐学报》2017年09期 　论文类型：期刊论文

【摘要】：基于Bingham模型,测试了不同骨料裹浆厚度时新拌混凝土的流变参数,探究了骨料裹浆厚度对新拌混凝土流变性能的影响。结果表明,改变骨料裹浆厚度能够明显影响新拌混凝土的流变性能。在保持骨料基本参数不变时,随着骨料裹浆厚度的增加,混凝土的屈服应力、塑性黏度和静态屈服应力基本呈降低趋势,坍落度逐渐升高,混凝土的流动性得到改善;当在特定水灰比、骨料裹浆厚度相对较高时,拌合物的坍落度较高,且存在轻微离析现象。通过建立流变参数随骨料裹浆厚度的变化曲线,能够确定混凝土中的最佳胶凝材料用量,进而指导混凝土的组成设计。
[Abstract]:Based on the Bingham model, the rheological parameters of fresh concrete with different aggregate thickness were tested, and the effect of aggregate slurry thickness on the rheological properties of fresh concrete was investigated. The rheological properties of fresh concrete can be obviously affected by changing the thickness of aggregate slurry. When the basic parameters of aggregate are kept constant, the yield stress of concrete increases with the increase of aggregate thickness. The plastic viscosity and static yield stress showed a decreasing trend, and the slump gradually increased, and the fluidity of concrete was improved. When the slurry thickness of aggregate is relatively high at the specific water-cement ratio, the slump of the mixture is higher and there is a slight segregation phenomenon. Can determine the optimum amount of cement material in concrete, and then guide the composition design of concrete.
【作者单位】：湖南大学土木工程学院;中国建筑材料科学研究总院绿色建筑材料国家重点实验室;厦门理工学院土木工程与建筑系;
【基金】：国家国际科技合作专项(2015DFA50880) 国家自然科学基金(U1305243,51502279)
【分类号】：TU528
【正文快照】： 2.中国建筑材料科学研究总院绿色建筑材料国家重点实验室,北京100024;3.厦门理工学院土木工程与建筑系,福建厦门361024)根据富余浆体理论[1],新拌混凝土可看作是粗细骨料分散于浆体相中的多相分散流体,粗骨料之间的空隙由细骨料填充,细骨料之间的空隙则由水泥浆体填充。新拌混

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