A numerical simulation method for uniaxial compressive strength test of porous cement concrete

Abstract

The invention discloses a numerical simulation method for uniaxial compressive strength test of porous cement concrete, which comprises the following steps: generating an initial space area of a numerical sample by using a wall command in PFC3D software; generating ellipsoidal particles representative of the aggregate according to the gradation of the aggregate; compacting the numerical specimen to the required height of the final numerical specimen by setting the gravity field and controlling the effect of wall. The meso-mechanics model is selected for the contact between particles. The walllocated on the top and bottom of the final numerical specimen is used to simulate the indenter and end ferrule of uniaxial compressive strength test in laboratory. Based on the stress-strain curve derived from laboratory uniaxial compressive strength tests, the parameters are determined and calibrated by simulation, so as to realize the numerical simulation of uniaxial compressive strength test ofporous cement concrete. This method solves the problems of large dispersion, high cost and long period in laboratory test of porous cement concrete, and provides a basis for the study of meso-structure of porous cement concrete.

Description

technical field [0001] The invention relates to a porous cement concrete discrete element numerical simulation technology, in particular to a numerical simulation method for a porous cement concrete uniaxial compressive strength test. Background technique [0002] At present, with the rapid development of the national economy, my country's highway construction is advancing by leaps and bounds. The well-connected traffic brings convenience to people, but it also brings serious traffic noise pollution and frequent traffic safety problems. In addition, in recent years, due to drainage problems on roads in some cities, rainwater cannot be properly guided after heavy rains, resulting in water accumulation on roads. The porous cement concrete material, with its unique skeletal void structure, paved into a drainage pavement can significantly improve the drainage efficiency of the road, reduce the possibility of urban waterlogging, and can improve the safety and comfort of driving,...

AI Technical Summary

Problems solved by technology

The well-connected traffic brings convenience to people, but it also brings serious traffic noise pollution and frequent traffic safety problems.

In addition, when testing the indoor uniaxial compressive strength, the porous cement concrete needs to be cured for 7 days or 28 days according to the needs. When measuring the elastic modulus, it needs to be cured for 90 days before testing. The cycle is very long

In addition, at present, the research on porous cement concrete materials at home and abroad mostly relies on indoor experiments, and the discrete element simulation of porous cement concrete is still in the preliminary research stage, and there are few studies on the mesostructure of porous cement concrete.

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