“水泥使用后，鉴定其安定性是否合格”的方法。回目的：了解混凝土中所用水泥是否安全。2方法：沸煮已成型的试块，观察其体积变形情况。3原理：（1）温度能加快混凝土试块中f—CaO、f－MgO等与水的化学反应速度。而上述物质与水反应体积增大，会对成型的混凝土结构造成膨胀破 “After cement is used, identify the stability of the cement”. Back to the goal: to understand whether the cement used in concrete is safe. 2 methods: boil the molded test block, observe the volume deformation. 3 Principles: (1) Temperature can accelerate the chemical reaction rate of f-CaO, f-MgO, etc. with water in the concrete test block. The increase in the reaction volume of the above substances with water will cause the expansion of the formed concrete structure.