Based on the research on the influence of dosage of magnesium high performance concrete cracking resistance agent(FQY)on the mechanical properties,expansion properties and impermeability of concrete,the optimum content of FQY in concrete engineering is determined and anti-permeability concrete applicable in salt-rich environment is prepared.The results showed that 4%and 6%FQY have little effect on the compressive strength of concrete.The 28 d compressive strength of 8%and 10%FQY decreased by 3.1%and 7.2%,respectively.FQY could compensate the shrinkage of concrete and improve the impermeability of concrete.6%was the best content.The chloride migration coefficient of concrete was reduced by 76.5%by using PERMIT ion migration method.It significantly improved its tolerance in salt-rich environments.
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