As a key admixture of shotcrete,the adaptability of quick-setting agent and cement plays an important role in the construction performance of shotcrete.Taking the shotcrete quality accident of a bid section of Shanan Expressway as an example,the main causes of the shotcrete quality accident of the project were studied and the problem was solved.The results show that the C3A content in cement clinker is too high and unstable,and the adaptability of alkali-free liquid quick-setting agent(aluminum sulfate)is poor,and the initial and final setting time is prolonged,which can easily lead to large-scale block drop in shotcrete,and the quick-setting agent formula needs to be adjusted to solve the problem.
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