Shrinkage microcracking in cement-based materials with low water-cement ratio
Shrinkage microcracking in cement-based materials with low water-cement ratio
复制标题
低水灰比水泥基材料的收缩微裂
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
J. Mier
中科院分区：
文献类型：
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作者：
J. Bisschop;P. Lura;J. Mier
本文研究了高强水泥基材料内部约束引起的收缩微裂纹。已经研究的两种类型的内部约束是骨料颗粒的约束和由于干燥试样中的差异收缩引起的自约束。由于多种原因，使用破坏性显微镜技术检测大体积混凝土中的自收缩微裂纹是非常困难的。然而，在本文中描述了一种破坏性的显微镜检查方法，它允许检测自生微裂纹，只要骨料含量的选择方式，自生微裂纹形成一个完全互连的网络。所研究的混合物不是实际的混凝土，但它们的自生收缩微裂纹模式可用于验证预测水泥基材料收缩和开裂的数值模型。这些水泥基材料的干燥收缩微开裂行为与“操纵”骨料含量也进行了研究。
This paper deals with shrinkage microcracking due to internal restraints in high-strength cement-based materials. The two types of internal restraints that have been studied are restraint of the aggregate particles and self-restraining due to differential shrinkage in a drying specimen. For a number of reasons it is very difficult to detect autogenous shrinkage microcracks in the bulk of concrete using destructive microscopy techniques. However, in this paper a destructive microscopy method is described, which allows to detect autogenous microcracks, provided that the aggregate content is chosen in such way that the autogenous microcracks form a completely interconnected network. The mixtures studied are not actual concretes, but nevertheless their autogenous shrinkage microcracks patterns can be used to validate numerical models that predict shrinkage and cracking of cement-based materials. The drying shrinkage microcracking behaviour of these cement-based materials with ‘manipulated’ aggregate content has also been studied.