Concrete delayed coagulation air entraining agent

Abstract

The invention relates to a building material, in particular to a concrete delayed coagulation air entraining agent which comprises the following components in parts by weight: 2-5 parts of lauryl sodium sulfate, 20-30 parts of sodium dodecyl benzene sulfonate (SDBS), 15-25 parts of white sugar, 10-16 parts of sodium hexametaphosphate, 12-18 parts of sodium gluconate and 22-25 parts of secondary coal ash. The invention has the following advantages: 1, the production process is simple and practicable; 2, the doping amount of the air entraining agent is less, and the cost is low; 3, the doping amount of the air entraining agent accounts for 0.2-0.8% of gelled materials; and 4, after the air entraining agent is doped, the hydration heat of mass concrete can be effectively inhibited, the centralized release of the hydration heat peaks of the concrete can be reduced, the concrete can be prevented from generating cracks, the bleeding rate of the concrete is lowered, the workability of the concrete is improved, and the durability of the concrete can be enhanced.

Description

technical field [0001] The invention relates to building materials, in particular to a retarding air-entraining agent added for making concrete. Background technique [0002] Today, with the continuous expansion of construction scale, multi-functional performance requirements are also put forward for concrete, especially for the construction of large-volume concrete. Concentrated release to avoid temperature stress cracks in concrete requires low heat of hydration and slow heat release. Concrete needs retardation, thereby reducing shrinkage and cracks on the concrete surface, and improving the impermeability and durability of concrete. At present, according to the GB8076-2008 standard, concrete admixtures with retarding properties include high-performance water reducing agents, high-efficiency water reducing agents, ordinary water reducing Water reducers and pumping agents are very effective, but the cost is relatively high; the retarded water reducers of ordinary water red...

AI Technical Summary

Problems solved by technology

At present, according to the GB8076-2008 standard, concrete admixtures with retarding properties include high-performance water reducing agents, high-efficiency water reducing agents, ordinary water reducing Water reducers and pumping agents are very effective, but the cost is relatively high; the retarded water reducers of ordinary water reducers mainly refer to wood calcium, wood sodium, etc. Although the price is low and the amount is small, they are not compatible with cement Poor adaptability, especially the cement containing fluorine gypsum or anhydrite, often appears "false setting" or does not solidify for a long time; at the same time, the gas content of products produced by various processes varies greatly, although the retarder can Retarding, but no air content, high bleeding rate, poor wrapping of concrete, and no guarantee of durability

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