火灾后套筒灌浆料力学性能试验研究

为研究火灾对套筒灌浆料力学性能的影响,设计不同受火时间(60,90 min),不同静置时间(1,14 d)以及不同冷却方式(自然冷却、喷水冷却)试验,分析不同工况下的套筒灌浆料的抗折强度和抗压强度.结果表明:随着受火时间的增加,套筒灌浆料的抗折、抗压强度均逐渐降低,自然冷却后抗折强度残余率分别为11.3％、9.1％,抗...

Experimental study on mechanical properties of sleeve grouting material after fire

In order to study the influence of fire on the mechanical properties of sleeve grouting material,the tests with different fire durations (60 min,90 min),different standing time (1 d,14 d) and different cooling methods (natural cooling,water spray cooling) were designed to analyze the flexural strength and compressive strength of sleeve grouting material under different working conditions.The results showed that with the increase of fire duration,both the flexural strength and compressive strength of sleeve grouting material decreased gradually.After the natural cooling,the residual rate of flexural strength was 11.3% and 9.1% respectively,and the residual rate of compressive strength was 48.4% and 25.8% respectively,with a greater decline in flexural strength.With the increase of standing time,the flexural strength of sleeve grouting material decreased gradually,and the compressive strength decreased by 5.5% under the natural cooling condition,while it increased by 11.4% and 7.3% respectively under the water spray cooling condition.All the fire duration,standing time and cooling method had adverse influence on the flexural strength and compressive strength of sleeve grouting material,and the fire duration had the greatest influence.The test results can provide the basis for the appraisal evaluation and reinforcement design on the grouting sleeve joint of prefabricated concrete structure after fire.