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为了更好地分析等粒径多孔水泥混凝土内部结构与破坏机理的关系,利用BT500工业CT对等粒径混凝土试件进行了内部结构扫描,并利用图像处理技术进行了初步分析,再通过数值模拟技术分析了等粒径多孔水泥混凝土与传统多孔水泥混凝土组成和内部结构的区别,从微观角度对比、探讨了等粒径多孔水泥混凝土的破坏机理。分析表明:等粒径多孔水泥混凝土忽略了集料级配的嵌挤作用,通过提高水泥膜的厚度来完成集料之间的堆积,从而在确保空隙率的基础上提高强度;等粒径多孔水泥混凝土独特的内部结构使得其可以在获得大空隙率的前提下,具有较大的抗压强度的能力。同时考虑到空隙率大既有利于排水,又有利于抵抗拉应变,因此,等粒径多孔水泥混凝土的开发为解决高速公路重载条件下路面基层开裂奠定了基础。
In order to better analyze the relationship between the internal structure and failure mechanism of equal-sized porous cement concrete, the internal structure of the equivalent-size concrete specimen of BT500 industrial CT was scanned and analyzed by using image processing technology. Then the numerical simulation Technical analysis of the difference between the composition and the internal structure of the equal-sized porous cement concrete and the traditional porous cement concrete, from the microscopic point of view, explores the failure mechanism of the equal-sized porous cement concrete. The analysis shows that the equal-size porous cement concrete ignores the embedding effect of aggregate gradation, and the accumulation of aggregates is completed by increasing the thickness of the cement film so as to increase the strength on the basis of ensuring the porosity; The unique internal structure of cement concrete makes it possible to obtain a large compressive strength under the premise of obtaining a large void ratio. At the same time, taking into account the large porosity both conducive to drainage, but also conducive to the resistance to tensile strain, therefore, the development of equal-size porous concrete to pave the way for highway pavement foundation under heavy load cracking laid the foundation.