Concrete super retarder and preparation method thereof

Abstract

The invention belongs to the technical field of civil engineering material, and relates to a novel concrete super retarder and a preparation method thereof. A technical scheme of the present invention comprises that: the concrete super retarder adopts hydroxyethylidene diphosphonic acid (HEDP), amino trimethylene phosphonic acid (ATMP) and water as raw materials, wherein a mass ratio of the three raw materials is 6:1:13. The preparation method comprises sequential adding the HEDP, the ATMP and the water into a stirring vessel, followed by slow heating to a temperature of 35-45 DEG C and uniform stirring. With the present invention, production technology of the concrete super retarder is simple, comprehensive production cost of the concrete super retarder is low, and later strength of the concrete is not reduced but is improved. An addition proportion of the concrete super retarder in the concrete is 0.05%-0.5% of mass of cementitious materials, such that the concrete can have an initial setting time of 0-120 hours, and the later strength of the concrete is unaffected after completing retarding. The concrete super retarder is widely applicable for a plurality of fields such as concrete construction in summer and mass concrete construction. According to the present invention, generations of temperature cracks are effectively prevented, slump loss is decreased, and long distance transport of the concrete is easy to be performed.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, and relates to a novel super retarder for concrete and a preparation method thereof. Background technique [0002] Ordinary concrete retarder refers to the admixture used to delay the setting time of concrete, so that fresh concrete can maintain its plasticity for a long time, so as to facilitate the pouring of concrete or reduce the heat of hydration, and improve the construction quality of concrete. In summer concrete construction and mass concrete construction, it can delay the setting and hardening of concrete and reduce the heat of hydration, so as to achieve the vibrating time of fresh concrete and prevent the occurrence of temperature stress cracks. Common retarders are widely used in engineering: [0003] (1) When pouring or transporting concrete in a high-temperature environment, or performing concrete construction in a hot area or in a high-temperature season, due t...

AI Technical Summary

Problems solved by technology

[0031] The main disadvantages of the above-mentioned super retarders are that more raw materials are required, the production process is more complicated, and the overall production cost is high.