High-frost-resistant hydraulic concrete for high elevation regions
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A technology of hydraulic concrete and high frost resistance, applied in the field of concrete, can solve the problems that concrete is easily damaged by freezing and thawing, buildings cannot function, and affect safe use, etc., and achieves important engineering application prospects, reduces engineering costs, and guarantees resistance to Effects of Freeze Durability
Inactive Publication Date: 2016-03-09
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION +2
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[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 wi...
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Embodiment 1
[0034] A method for preparing high frost-resistant hydraulic concrete in high-altitude areas, comprising the following steps:
[0035] (1) Clear design indicators
[0036] Concrete used in a water conservancy project in Tibet, with an altitude of 3300km, the design requires a strength grade of C9025 and a frost resistance grade of F200.
[0037] (2) Concrete raw materials and mix ratio
[0038] Raw materials include Huaxin 42.5 medium-heat Portland cement, local limestone powder, natural artificial mixed aggregate, Jiangsu Bote JM-II high-performance water reducer and GYQ air-entraining agent. The test results of stone powder quality are shown in Table 1.1.
[0039] Table 1.1 Stone powder quality inspection results
[0040]
[0041] According to DL5330 "Code for Design of Mixture Proportion of Hydraulic Concrete", the calculated configuration strength of C9025 concrete is 31.6MPa. Combined with the absolute volume method, the concrete mix ratio and the amount of raw mat...
Embodiment 2
[0055] A method for preparing high frost-resistant hydraulic concrete in high-altitude areas, comprising the following steps:
[0056] (1) Clear design indicators
[0057] Concrete used in a water conservancy project in Tibet, with an altitude of 3300km, the design requires a strength grade of C9025 and a frost resistance grade of F200.
[0058] (2) Concrete raw materials and mix ratio
[0059] Raw materials include Huaxin 42.5 medium-heat Portland cement, Gansu Shizuishan Class II fly ash, natural artificial mixed aggregate, Jiangsu Bote JM-II high-performance water reducer and GYQ air-entraining agent. The test results of fly ash quality are shown in Table 2.1.
[0062] According to DL5330 "Code for Design of Mixture Proportion of Hydraulic Concrete", the calculated configuration strength of C9025 concrete is 31.6MPa. Combined with the absolute volume method, the concrete mix ratio and the amount of raw mate...
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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...
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