Abstract：As a common lightweight aggregate concrete, full lightweight ceramsite concrete has a very good engineering prospect, especially in high-rise buildings and assembled structures. However, the current research on ceramsite concrete is mainly at the macro level. On the mesoscopic level, the ceramsite concrete is regarded as a three-phase composite material composed of ceramsite, cement mortar and ceramsite-cement mortar interface transition zone. The M-T homogenization theory is used to verify the accuracy of the model parameters by comparing the experimental results. At the same time, a mesoscopic two-dimensional model of ceramsite concrete was established to further study the damage mechanism and crack development law of ceramsite concrete. The results showed that through the reasonable mix design of ceramsite concrete, ceramsite concrete that can meet the LC35 strength grade and meet the density requirements of lightweight aggregate concrete can be prepared under the equal volume of ceramsite instead of gravel. Through the simulation of the two-dimensional 150 mm×150 mm component of ceramsite concrete, it is found that the compressive failure of ceramsite concrete begins to crack from the interface transition zone, and then the crack penetrates the ceramsite and further expands until the ceramsite concrete reaches the ultimate load strength. Through the numerical simulation of splitting tensile strength of ceramsite concrete, some of the cracks at the end of ceramsite concrete run through the aggregate, and some develop along the interface area between aggregate and mortar.
2024, Vol. 0 
