硅酸盐学报

骨料裹浆厚度对混凝土流变性能的影响

单位：1. 湖南大学土木工程学院长沙 410082 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

分类号：TQ172

出版年,卷(期):页码：2017,45(9):0-0

DOI：

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。

基金项目：

国家国际科技合作专项(2015DFA50880)；国家自然科学基金(U1305243，51502279)。

作者简介：

焦登武(1992—)，男，博士研究生。

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