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文章采用自行设计的塑性抗拉强度、塑性收缩应力测定装置测试了水泥砂浆、混凝土塑性抗拉强度和塑性收缩应力。以水泥混凝土出现塑性收缩开裂时试件表面毛细管收缩应力应大于或等于其塑性抗拉强度为前提,提出了毛细管收缩应力临界作用深度和塑性收缩开裂抗裂指数的概念,建立了试件塑性开裂与塑性收缩开裂抗裂指数的关系,形成了一套水泥基材料塑性收缩开裂抗裂判据,并采用砂浆、混凝土平板法塑性开裂实验对建立的判据进行了验证。
In this paper, the self-designed plastic tensile strength and plastic shrinkage stress measuring device were used to test the plastic tensile strength and plastic shrinkage stress of cement mortar and concrete. The plastic shrinkage cracking of cement concrete surface when the capillary shrinkage stress should be greater than or equal to its plastic tensile strength as a precondition to put forward the capillary shrinkage stress critical depth and plastic shrinkage cracking resistance index to establish a specimen of plastic cracking And the plastic shrinkage cracking resistance index, forming a set of cement-based materials plastic shrinkage and cracking cracking criteria, and the use of mortar and concrete slab plastic cracking test established the criteria were verified.