Cement-based cementitious material suitable for -10°C~-30°C environment and its construction method and application

Abstract

The main purpose of the present invention is to provide a cement-based cementitious material suitable for an environment of -10°C to -30°C, as well as its construction method and application. The materials include 0-5 parts by mass of anhydrite; 15-25 parts of sulphoaluminate cement; 0.1-0.3 parts of water reducing agent; 0-0.3 parts of water-retaining agent; 0.1-0.3 parts of strengthening agent; 55-75 parts of sand; 1-3 parts of antifreeze and 7-12 parts of water. The technical problem to be solved is to address the defect that the existing cement-based cementitious materials cannot be mixed and constructed without heating on site under negative temperature conditions. By controlling the freezing point of the mixing solution and promoting cement hydration, etc., And adjust the composition ratio of the cementitious material so that it can meet the use requirements in the extreme negative temperature environment, and achieve the purpose of direct mixing, pouring and heat-free maintenance of cold materials in a low temperature environment of -10 to -30 °C; The cement-based cementitious material does not require additional special curing measures such as heating and curing. Its strength develops quickly, its cost is low, and it does not affect the progress of the project, so it is more suitable for practical use.

Description

technical field [0001] The invention belongs to the technical field of building material manufacturing, and in particular relates to a cement-based cementitious material suitable for an environment of -10°C to -30°C, a construction method and application thereof. Background technique [0002] Negative temperature construction in winter is becoming more and more common, and with the proposal of my country's polar strategy, it is extremely urgent to develop cement-based cementitious materials that meet the requirements of negative temperature environments. [0003] Relevant studies have shown that the hydration reaction of sulfoaluminate cement can still proceed at negative temperatures, and the types of hydration products will not change. For example, in an environment of -5°C, sulfoaluminate cement can be continuously hydrated, and its hydration product is still ettringite, and the addition of nitrite antifreeze can significantly improve its strength, and the 28-day compress...

AI Technical Summary

Problems solved by technology

The technical problem to be solved is to address the defect that the existing cement-based cementitious materials cannot be mixed and constructed without heating on site under negative temperature conditions. By controlling the freezing point of the mixing solution and promoting cement hydration, etc., And adjust the composition ratio of the cementitious material so that it can meet the use requirements in the extreme negative temperature environment, and realize the purpose of direct mixing and pouring of cold materials in the low temperature environment of -10 ~ -30 ° C without heating and curing; the said The cement-based cementitious material does not require additional special curing measures such as heating and curing. Its strength develops quickly, its cost is low, and it does not affect the progress of the project, so it is more suitable for practical use.

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