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Ningxia University (2020)

Compressive Strength Test and Numerical Simulation of Desert Sand Concrete after High Temperature

刘强;

Titre : Compressive Strength Test and Numerical Simulation of Desert Sand Concrete after High Temperature

Auteur : 刘强;

Grade : Master’s Theses 2020

Université : Ningxia University

Résumé partiel
At present,building fire has become the most serious disaster,causing the most serious damage.Therefore,the study of mechanical properties of concrete after high temperature has very important significance.Sand is one of the indispensable materials for the preparation of concrete.In order to protect the ecological environment,many places have begun to limit or ban river sand.In the western part of China,desert sand reserves are abundant and concentrated.Applying desert sand to concrete can not only solve the problem of the shortage of medium sand,but also alleviate the pressure of desertification.In this paper,the compressive strength of desert sand concrete after high temperature is studied experimentally.The influence of temperature and desert sand replacement rate on the compressive strength of desert sand concrete after high temperature is analyzed.The mechanical properties of desert sand mortar after high temperature are tested.The effects of temperature and desert sand replacement rate on the peak stress,peak strain,elastic modulus,Poisson’s ratio and stress-strain relationship of desert sand mortar after high temperature were analyzed.The desert sand concrete is regarded as a two-phase composite material composed of desert sand mortar and coarse aggregate.The parameters of the constitutive model of the desert sand mortar after high temperature are determined by experiments.The numerical simulation of the uniaxial compression failure of the desert sand concrete after high temperature is carried out by ANSYS.The effects of specimen size,coarse aggregate volume,coarse aggregate minimum particle size,coarse aggregate intermediate particle size and coarse aggregate maximum particle size on the compressive strength of desert sand concrete after high temperature were analyzed.The main contents are as follows:1)The compressive strength test of desert sand concrete after high temperature was carried out to analyze the influence of temperature and desert sand replacement rate on compressive strength

Mots clés : desert sand concrete; desert sand mortar; numerical simulation; coarse aggregate; high temperature; compressive strength;

Présentation (CNKI)

Page publiée le 30 mars 2022