A kind of ultra-low temperature concrete antifreeze agent and its application

Abstract

The invention discloses an antifreeze agent for ultra-low temperature concrete and its application. The components of the antifreeze agent and the mass parts of each component are as follows: 10-20 parts of calcium silicate hydrate, 4-8 parts of rubber powder, and 3.5-3 parts of sodium nitrite. 8.7 parts, 2.8-6.5 parts of sodium sulfate, 2-5 parts of organic alcohol amines, 0.1-0.7 parts of triterpene saponins, 2.35-5.48 parts of thioglycolic acid, 6.4-10.5 parts of acrylamide, 1.0-1.8 parts of sodium dodecylsulfonate 2-4 parts of melamine, 8-10 parts of sodium gluconate. The antifreeze agent of the present invention can be applied to the minimum environment of -50°C, and the dosage is 20% of the cement mass in the concrete. Under the condition of -50°C, the strength of concrete -7+28d can reach the standard concrete strength of 28 days, and the product performance can reach GB475 standard requirement.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to an ultra-low temperature concrete antifreeze agent and its application. Background technique [0002] my country has a vast territory, and the winter half-year lasts longer in most parts of the country, especially in the Northeast, Northwest, North China and the Qinghai-Tibet Plateau, where the winter lasts for 3 to 6 months. With the development of engineering construction, concrete winter construction is more common, and the long winter cold season has brought many problems to engineering construction, so it is stipulated in the "Reinforced Concrete Engineering Construction and Acceptance Specifications": When the temperature is kept below 5°C, the construction projects of concrete and reinforced concrete shall be carried out in accordance with the relevant regulations of winter construction. This is because, when the average temperature is less than or...

AI Technical Summary

Problems solved by technology

At present, there are mainly three types of concrete antifreeze produced in China: -5°C, -10°C and -15°C. When the temperature is lower than -20°C, there is a lack of corresponding antifreeze products.