Research On Compressive Properties Of Ceramite Concrete Affected By Freezing And Thawing Cycle Temperature

In this paper,dynamic elastic modulus testing,quasi-static compression,and SHPB bundle compression tests are performed on samples of freeze-thaw cycles at different temperature ranges to research the effect of freeze-thaw cycling temperature on compressive properties of ceramsite concrete.Non-metallic ultrasonic tester is used to measure the ultrasonic velocity of the two freezethaw cycle temperatures(10°C~-10°C,10°C~-20°C)to obtain the elastic modulus,the horizontal SHPB beam device and the microcomputer-controlled universal testing machine are respectively used to perform the dynamic and static compression tests on the above samples.The dynamic elastic modulus test results show that,In the same freeze-thaw cycle,the lower the freeze-thaw cycle temperature of the sample,the lower its dynamic elastic modulus,affected by the ceramsite aggregate,the larger the ceramic volume content of the sample,the more internal holes and gaps,the lower the measured ultrasonic wave velocity,the lower the dynamic elastic modulus,at the same freeze-thaw cycle temperature,the dynamic elastic modulus of ceramsite concrete decreases with the increase of cycles of freeze-thaw cycle.The quasi-static compression test results show that with the decrease of the freeze-thaw cycle temperature of the sample,the damage of the sample is intensified and the static compressive strength is also reduced,when the freeze-thaw cycle conditions and the freeze-thaw cycles are the same,the larger the ceramic volume of the sample,the lower the compressive strength,when the ceramic particles have the same volume,the larger the freeze-thaw cycles are,the greater the damage is,and the weaker the compressive capacity is.The dynamic compression test of horizontal SHPB beam shows that when the freeze-thaw cycle temperature decreases,the dynamic maximum stress of the samples with same ceramic volume content and freeze-thaw cycles is also decreased.Under the freeze-thaw cycles at 10~-20°C,the maximum stress of mortar concrete and 15% volumetric ceramsite concrete decreased after 10 freeze-thaw cycles,the 30% and 45% volumetric ceramsite concretes showed a decrease in their maximum stress after 20 freeze-thaw cycles,the concrete samples after the 20 th cycles of freeze-thaw cycles are approximately the same as the concrete damaged by 30 th freeze-thaw cycle specimens subjected to a freeze-thaw cycle of 10~-10°C,description under the same conditions,the effect of reducing the freezing-thawing cycle temperature and increasing the cycles of freeze-thaw cycles the weakening effect on the compressive strength of ceramsite concrete is quite similar,and the law of influence of freeze-thaw cycling temperature,freeze-thaw cycles,and ceramic volume content on compressive properties of ceramsite concrete is obtained.