The fourth: "Cut" mud-known life of this step to cement mainly used fingers to "pulse", to identify their length of time in the factory. Cement also has shelf life, in general, more than 30 days of the date of manufacture of cement strength will decline. Cement its strength after storage for three months decreased by 10% to 20% after one year decreased by 25% -40%. Proper use of cement should be no damp agglomeration, high-quality cement cement cement powder with your fingers twist density, fine particles feel the feeling. Packaging inferior cement cement, opening inspection will damp and agglomeration; inferior cement cement powder with your fingers twist, a rough sense, indicating that the cement fineness thick, is not normal, when the use of low-intensity, viscosity is poor. 1813 white cement, the French civil engineer Albert and found the performance of cement lime and clay by three to one of the best blend. In 1824, the British construction worker Joseph Aspen spectrum D (Joseph Aspdin) invented the cement and Portland cement made patent. He limestone and clay as raw material, by a certain percentage with cement, calcined clinker burning in the lime kiln is similar, and then ground into cement. Because of the color of the hardened cement and Portland, England island where stone for the construction of similar, was named Portland cement. It has excellent building performance, a landmark in the history of cement. Cement board | Wuhan cement (certified) | Jianghan 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. Wuhan cement leadership with the staff warmly welcome all inquiries negotiations to create a better future Wuhan cement.