Concrete frostbiting is the important factor that influence the concrete structure endurance. To ensure the endurance of some important project, more and more importance is attached to the concrete freezing resistance.

混凝土的凍害是影響混凝土結(jié)構(gòu)耐久性的重要因素欧美日韩·A级黄片视频1，為了保證一些重大工程的耐久性黄色工厂这里只有精品，混凝土的抗凍性已經(jīng)越來越引起人們的重視狂野欧美网站入口。

At present there are mostly Hydrostatic Pressure Theory and Penetrative Pressure Theory with regard to concrete frostbiting principle after setting. But they are not the last word, because the pressure can not be measured directly or calculated exactly. The two theories can triumphantly explain much phenomenon about concrete in the freeze-thaw process.

混凝土硬化后的凍害機理目前主要有靜水壓學(xué)說和滲透壓學(xué)說，由于不能直接測定或進行準(zhǔn)確計算，所以還沒有定論91看片婬黄大片涩爱，但它們可以成功地解釋混凝土凍融過程中的很多現(xiàn)象。