Technical requirements magnesia clinker MgO content shall not exceed 4.5%. Content of sulfur trioxide trioxide cement shall not exceed 3.5%. Fineness 0.080 mm square hole sieve shall not exceed 10%. Setting time initial set no earlier than 45 minutes, the final setting not later than 12 hours. Stability test with boiling cooking method, had to qualify. The strength of each label corresponding order of strength are not less than the value in Table 1: Table 1 Wuhan compressive strength cement grade cement, kg / cm 2 compressive strength, kg / cm 3 days 23 days 28 days 28 days whiteness of white cement for minimal value not less than 87. The cement paste shrinks in dry conditions, in a damp environment expands. Calcium hydroxide and hydrated calcium aluminate will be subject to erosion of seawater sulfate Wuhan cement manufacturers, so the harbors used to restrict the content of cement calcium aluminate cement. Wuhan Ray Hill cement, will happen if the high alkali content of the cement in the cement, aggregates and concrete made from silicon oxide and contains active alkali - aggregate reaction, volume expansion, cement and concrete will be destroyed. Wuhan peak of cement, cement pavilion (certified), cement provided by the Hongshan District of Wuhan pavilion cement operation. Hongshan District of Wuhan pavilion cement business unit (www.whltsn.com) (www.hbltsn.com) was Wuhan, cement and products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum Limits to meet customer needs. Cement leader in the pavilion with the staff warmly welcome all inquiries negotiations to create a better future for cement pergola.