High-crack-resistant concrete suitable for severe environment and construction method thereof

Abstract

The invention relates to high-crack-resistant concrete suitable for a severe environment. The concrete is characterized by being prepared from the following raw materials in parts by weight: 250-300 parts of cement, 50-120 parts of mineral additives, 950-1150 parts of coarse aggregates, 650-850 parts of fine aggregates, 29-40 parts of an internal curing material, 3.6-4.4 parts of additives and 136-150 parts of water. The construction method of the concrete comprises the following key steps: a, stirring the raw materials in proportion to obtain fresh mixed concrete; b, pouring the fresh mixed concrete in a sequence in a shape of a traditional Chinese character Zhi in a construction shed with sun-shielding and wind protecting effects; c, vibrating twice by using a vibrating needle shown in the specification; and d, after plastering the concrete, immediately spraying a quick film forming curing agent for insulating and moisturizing windproof curing. The concrete provided by the invention has the excellent functions of water retention, internal curing, reduction and the like, and still has a good anti-crack performance in the severe environment.

Description

technical field [0001] The invention relates to a high-crack-resistant concrete suitable for harsh environments and a construction method thereof, in particular to a high-crack-resistant concrete applicable to harsh environments (relative humidity lower than 30%, wind speed greater than 10m / s, and daily temperature difference 30°C). Cracking, long service life concrete. Background technique [0002] According to my country's "Medium and Long-Term Railway Network Planning (Adjusted in 2008)", by 2020, the national railway operating mileage planning target will be adjusted from 100,000 kilometers to more than 120,000 kilometers, and the passenger dedicated line will be adjusted from 12,000 kilometers to 16,000 kilometers. Several of the proposed routes traverse regions characterized by harsh environments such as high altitude, high cold and arid wind and sand. The existing projects in the above-mentioned areas show that due to the harsh natural environment, the concrete struct...

AI Technical Summary

Problems solved by technology

The existing projects in the above-mentioned areas show that due to the harsh natural environment, the concrete structure is very easy to crack, which leads to the acceleration of the failure process of the concrete protective layer on the protection of the steel bar, so that the air, moisture and harmful ions in the environment can penetrate the surface of the steel bar unexpectedly, and then It will cause deblunting and corrosion of steel bars, which will eventually affect the durability and service life of the structure, which poses a serious challenge to the safe service of concrete structures in harsh environments within the design service life

[0003] my country has a vast land area and complex and diverse climate environments. Existing concrete anti-cracking technologies (such as CN 103193425 A, CN103482940 A and CN 103524087 A, etc.) can usually show good anti-cracking effects in general environments, but in harsh environments, their The effect is often invalid, that is, its poor adaptability to the environment

In addition, existing concrete anti-cracking technologies generally focus on the formulation of concrete materials, often ignoring the importance of concrete material construction, and a large number of anti-cracking materials have poor performance in engineering applications without supporting scientific construction methods

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