Recently, China National Railway Group Co., Ltd. released data showing that in the first three quarters, the national railway completed fixed assets investment of 508.9 billion yuan, an increase of 7.1% over the same period last year, and put into operation 1402 kilometers of new railway lines, of which 1276 kilometers were high-speed rail, which provided strong support for the sustained economic recovery.
Specifically, in the first three quarters, the Guizhou-Nanning high-speed rail, the Guangzhou-Shanwei high-speed rail, the Fuzhou-Xiamen-Zhangzhou high-speed rail, and the Shanghai-Nanjing high-speed rail along the Yangtze River were put into operation; the Xining to Golmud section of the Qinghai-Xizang Railway, the Lanzhou-Xining section of the Lanzhou-Xinjiang high-speed rail, and the Guizhou-Guangzhou high-speed railway were completed and put into operation; A number of projects, such as the reconstruction of the original site of Dali Railway Station and the expansion and reconstruction of the Golmud-Korla Railway, have started construction, and new progress has been made in a number of key projects under construction, such as the Baotou to Yinchuan high-speed rail and the Lijiang to Shangri-La Railway. With dense
railways and fast high-speed rail, the most modern railway network and the most developed high-speed railway network in the world are laid on the vast land of the motherland and continue to extend, providing strong support for a dynamic mobile China.
If the railway is the "artery" of the national economy, then the high-speed rail is the "booster" of economic development, how to make the "booster" play a greater role? The importance of low-alkali cement should not be underestimated!
Low-alkali cement refers to the cement with low content of alkali metal oxides (potassium oxide and sodium oxide). The total alkali content is calculated by equivalent sodium oxide (Na2O + 0.658K2O ), and the total alkali content (equivalent sodium oxide) of low-alkali cement is required to be less than 0.6%. Compared
with other types of cement, low-alkali cement can reduce the risk of alkali-aggregate reaction caused by active aggregate used in concrete to affect the strength of concrete, reduce the amount of water reducing agent used in concrete, increase the workability of concrete, facilitate construction, improve the durability of concrete, and make the concrete look good after solidification. Track and bridge foundations in
high-speed rail are composed of cement concrete. If alkali metal ions (such as Na +, K +, etc.) In cement are brought into concrete and dissolved in concrete, and then gradually separated out, it will cause corrosion of steel bars in concrete and cracking of concrete, thus affecting the bearing capacity of the structure. Shorten the service life of the project. Especially when there are a lot of sulfate, chloride ions and other chemicals in the area where the high-speed rail passes through, it will increase the alkalinity of the concrete surface, accelerate the corrosion of steel bars and the aging of concrete, and affect the safety and stability of the operation of high-speed rail. For
this reason, it is necessary to use low-alkali cement in high-speed rail construction to effectively reduce the content of alkaline elements in concrete, so as to reduce the alkalinity of concrete, improve the anti-corrosion ability of concrete and prolong the service life of the project.
In recent years, railway products have higher and higher requirements for cement performance, and the selection of better and better low-alkali cement brands has become a factor that must be measured in construction. In domestic cement enterprises, there are many enterprises that can provide high-quality low-alkali cement, including Fangcheng County Wanbei Cement (Group) Co., Ltd., located in Nanyang, Henan Province.
It is understood that Wanbei Cement has excellent mine resources and advanced production technology, and has obvious advantages in the development of low-alkali cement. It is widely used in key national projects such as South-to-North Water Transfer Project, Zhengzhou-Wanzhou high-speed rail, Xinyang Minggang Airport, Zhounan Expressway, Xuxin Expressway, Zhengfu high-speed rail and Tianchi Pumped Storage Power Station in Henan Province, which ensures and improves the construction quality of these large-scale projects.
At present, Wanbei Cement can not only produce ordinary Portland cement and low-alkali cement, but also successfully develop special cement such as medium and low heat slag Portland cement and oil well cement.
"Time flies through the wind and frost, and the spring breeze comes after the bitter." From "natural moat" to "thoroughfare", from "suffering from travel" to "say go", China Railway has written a magnificent epic, and also boosted the economy out of the "acceleration" of the new era. In the future, high-quality low-alkali cement is expected to play a greater role in helping the construction of high-speed rail to a new level!
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