Witton Cement Group Co., Ltd. Share: Portland cement road technical requirements: MgO: Road magnesia cement content shall not exceed 5.0%. Trioxide: cement road trioxide content of not more than 3.5%. Loss on Ignition: cement road loss on ignition shall not exceed 3.0%. Free calcium oxide: road cement clinker free lime, kiln production shall not be greater than 1.0%; kiln production shall not exceed 1.8%. Alkali content: if the user requests, agreed upon by both parties. Tricalcium aluminate: tricalcium aluminum content in the way of cement clinker shall not exceed 5.0%. Iron and aluminum, tetra calcium: road cement clinker content of tricalcium aluminate of not less than 16.0%. Fineness: 80μm sieve shall not exceed 10%. Setting time: Initial setting no earlier than 1h, the final setting not later than 10h. Stability: Brewing with boiling test must be qualified. Shrinkage rate: 28 days shrinkage rate shall not exceed 0.10%. Wear: to represent the amount of wear, not more than 3.60kg / m. Strength: age strength of each label is not less than the value in the following table. Witton Cement Group Co., Ltd. to share: the history of cement: 1907 Shanxi road cement, France Bi Aili aluminum ore bauxite instead of clay, limestone firing became mixed cement. Since this contains large amounts of alumina cement, so called "alumina cement." In 1871, Japan began to build a cement plant. In 1877, the British invented the rotary kiln Crampton, and in 1885 by Lan Samu reform to better rotary kiln. Shan Xi Wei Dayton cement road, near the Chinese Tangshan Kaiping coal mines in 1889, set up with the kiln production of Tangshan "fine cotton soil" plant. 1906 on the basis of the plant established Qixin Cement Company Dayton cement Xi Wei Shan, an annual 40,000 tons of cement. 1893, and the Inland Sea of ??Japan Endo Hideyuki three Zhen duo invented afraid of seawater portland cement. 20th century, people continue to improve performance while Portland cement concrete roads, the successful development of a number of construction projects for special cement, such as alumina cement, special cement. Varieties of cement around the world has grown to more than 100 kinds, 2007 annual production of about 2 billion tons of cement. China in 1952 to develop the first national standard to determine the cement production to the principle of multi-label multi-species, and Portland cement its main mineral composition contained renamed silicate cement, later renamed the silicon Portland cement so far. In 2010, China's cement output reached 1.868 billion tons, accounting for over 50% of global production. Shan Xi Wei Dayton cement, cement road Yuncheng, Witton cement provided by Witton Cement Group Co., Ltd. Witton Cement Group Co., Ltd. (www.sxwdgs.com/) strong, credible, Shanxi Yuncheng 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 Witton cement into the brilliant and you work for a better future!