High-frost-resistant hydraulic concrete for high elevation regions

Abstract

The invention relates to a high-frost-resistant hydraulic concrete for high elevation regions. The concrete is characterized in that a single formula of the concrete comprises the components in percentage by weight: a gel material, which is 230-420 kg / m3, wherein the gel material comprises 80-100% of cement and 0-20% of limestone powder, or 60-100% of cement and 0-40% of coal ash, or 60-100% of cement, 0-20% of limestone powder and 0-20% of coal ash; a gravel aggregate, which is an artificial or natural gravel material, wherein the total amount of the gravels is 1800-2100 kg / m3, and the ratio of medium gravels to small gravels is 60: 40, 50: 50 or 45: 55, and the sand ratio is 30-34%; water, which is 110-125 kg / m3, wherein the water-binder ratio is not greater than 0.48; and an additive, which comprises a high-performance water reducer and an air entraining agent, wherein the doping amount of the water reducers accounts for 0.6-1.2% of the total mass of the gel material and the air entraining agent accounts for 0.005-0.02% of the total mass of the gel material. By virtue of steps of optimization of local raw materials, mix design, site operation, early maintenance and the like, the high-frost-resistant hydraulic concrete for high elevation regions is prepared. The 28-day frost resistant grade reaches over F200, so that the frost resistant durability of a concrete structure in the high elevation regions can be ensured, the project quality and safety are guaranteed, and the concrete has an important project application prospect.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to high-altitude high-freeze-resistant hydraulic concrete. Background technique [0002] It is generally believed that areas with an altitude above 3000m are high-altitude areas. Compared with other regions, the plateau and high-altitude regions, especially the Tibet region, are characterized by severe cold and dryness, strong ultraviolet radiation, large daily temperature differences, frequent windy days, and deep permafrost. For example, in the Nagqu region of Tibet, the average daily temperature difference in February can reach 20°C, and the annual average wind speed can reach more than 2.5m / s. The number of alternations reaches 187 times, and the freezing thickness is about 1.0m. [0003] Under the characteristic climate conditions of high altitude, concrete will be subject to frequent freeze-thaw cycles. Concrete is vulnerable to freeze-thaw damage. Once it is frozen, it wil...

AI Technical Summary

Problems solved by technology

[0003] Under the characteristic climate conditions of high altitude, concrete will be subject to frequent freeze-thaw cycles. Concrete is vulnerable to freeze-thaw damage. Once it is frozen, it will peel off in a large area, accompanied by leakage, carbonization and other diseases, which will cause the building to fail to perform its functions. Some functions, and ultimately affect its safe use

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