High-frost-resistant hydraulic concrete for high elevation regions

2015 
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.
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