In order to study the effect of different silica powder contents on the frost resistance performance of hydraulic concrete,hydraulic concrete test blocks were prepared with Portland cement,crushed stone,medium sand,water reduc-ing agent and silica powder as raw materials.Freeze-thaw cycle tests,uniaxial compression tests and dynamic elastic modulus tests were carried out on the test blocks with 0.0%,2.5%,5.0%,7.5%and 10.0%silica powder contents.The results show that the compressive strength of the hydraulic concrete test blocks decreases with the increase in the number of freeze-thaw cycles.Adding silica powder can effectively improve the frost resistance of hydraulic concrete,but the ef-fect will be affected if the content of silica powder is too high or too low.When the silicon powder content is 5%,the frost resistance effect is the best.Under 60 freeze-thaw cycles,the compressive strength is increased by 15.1%,the mass loss rate is decreased by 0.17%,and the relative dynamic elastic modulus is increased by 0.014%.
维普
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