Effect Of Elastic Modulus Of Cementitious Material On Creep Behavior Of Cement-based Materials

As a kind of long-term deformation properties of cement based materials,creep has a great influence on the concrete structure,especially the prestressed structure.The current research on the influence of mineral admixtures on the creep properties of cement-based materials is mostly based on the change of the content of mineral admixtures on the research for the influence of elastic modulus of cementitious materials on the creep properties of cement-based materials are few.In order to analyze the effect of cementitious materials on the elastic modulus and creep properties of cement-based materials,the elastic modulus of fly ash,cement and slag of two varieties were tested by nano indentation technique with mortar creep degree as the goal,according to the elastic cementitious material modulus comprehensive design experiments.The four bar type small spring compression creep tester was used to test the mortar with a size of 40 mm×40 mm×160 mm,and the loading stress level was 33%.At the temperature of(20±1)?and relative humidity(60±5)%,the creep of the mortar specimens in each group is tested,and will only change the cementitious material elastic modulus creep test results of cement based materials and only change the amount of mineral admixtures and water cement ratio and creep performance cement based material conditions were compared,in order to provide active control for cement base material creep and a new way of thinking.The test results showed that the elastic modulus has great influence on the creep properties of cementitious materials of cement-based materials;a cementitious material elastic modulus,creep degree between mortar group compared with baseline increases between 19.9%-34.4%;the change of two kinds of elastic modulus of cementitious material,mortar creep increases between 7.9%-41.2% group compared with baseline at this time,but the creep stability will be reduced,increased uncertainty,such as the strength of the specimen to influence the creep effect of cementitious material;Elastic modulus change on the creep properties of cement-based materials is greater than the influence of mineral admixture content variation and water binder ratio on creep properties of cement-based materials;The elastic modulus and creep of mortar with the highest correlation between strength and elastic modulus,the lowest correlation between elastic modulus and strength of the specimen through the creep effect analysis of cementitious material elastic modulus on the creep properties of cement-based materials is feasible;The research results provide a new way to control the creep properties of cement-based materials.