If the cement contains too much free calcium oxide or magnesium oxide, especially coarse particles, and when the plant has a shorter storage time, it will have stability unacceptable phenomenon. Because this fire (1000 ℃ above) calcium oxide and magnesium oxide is not completely been fully matured, their hydration is very slow, after the cement setting that is under constrained conditions began to cement hydration, volume expansion after generation, It will form a cracking phenomenon. In addition, cement board, would generate sulfur trioxide if the cement content is too sulphoaluminate volume expansion China Cement Net, will also be adversely stability. Stability testing methods in addition to the test cake method, as well as Reye clamp method and length measurement method. Although the latter two methods have a quantitative value limit, but the method of complex cement, Knowing is also poor; and test rule cake with simple equipment, easy operation, sensitive white cement prices, and direct observation, Knowing good range advantages, it is still listed as a national standard methods. Lian boiling cooking method can only detect the damaging effects of free calcium oxide. Since the fire burned more slowly than magnesium oxide, calcium oxide hydration rate, hence the boiling cooking method can not find insecurities caused by the magnesium oxide, only by autoclave test temperature, high pressure, in order to determine this phenomenon. The insecurities caused by sulfur trioxide, only cold bread method, immersion method can be tested, about to try cake in water after curing 28d 20 ℃ ± 3 ℃, checks whether there is instability phenomenon. Because when the temperature exceeds 60 ~ 70 ℃, it will not form a volume expansion generated sulphoaluminate. Conch Cement, Huangpi cement, cement supplied by Wuhan Hongshan District of Wuhan pavilion cement operation. Hongshan District of Wuhan pavilion cement business unit (www.whltsn.com) (www.hbltsn.com) strong, credible, in Wuhan of cement and related products industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Wuhan cement into the brilliant and you work for a better future!