Concrete additive and its preparation method and application

Abstract

The invention relates to a concrete additive and a preparation method and application thereof. Raw materials of the concrete additive includes one or more of a water-reducing component, an expansion component, a retarding component, an early strength component, an air entraining component, an antifreeze component and a waterproof component, wherein the water-reducing component is used for reducingthe water consumption of a mixture, the expansion component is used for making concrete expand slightly, and the retarding component is used for delaying a hydration reaction of binding materials; the early strength component is used for accelerating the early strength of the concrete, the air entraining component is used for improving the freezing resistance and / or durability of the concrete, and the antifreeze component is used for improving the freezing resistance of the concrete; and the waterproof component is used for reducing the water permeability of the concrete. After the additive is applied to the concrete, the mechanical properties of the concrete can be improved significantly, and the dosage is reduced significantly; and the additive is suitable for preparation of concrete for high-speed rails, subways, highways, offshore, ports and other high-performance concrete, and is suitable for preparation of high-fluidity self-compacting concrete and other concrete.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a concrete additive and its preparation method and application. Background technique [0002] In recent years, with the expansion of urban construction scale and the rapid construction speed, in Guangdong Province in the 1980s, a large number of concrete mixing plants were built in Shenzhen and Guangzhou. It is obvious to all that the development of ready-mixed concrete reflects a small change in a year, a medium change in three years, and a major change in ten years. At the same time, in order to eliminate outdated on-site mixing of concrete, Shang Gaifa [2003] No. 341 Notice on the prohibition of on-site mixing of concrete in urban areas within a time limit: Beijing and other 124 urban areas have banned on-site mixing from December 31, 2003 Concrete, other provinces (autonomous regions) and municipalities directly under the central government shall prohibit on-site ...

AI Technical Summary

Problems solved by technology

⑦Limited by the utilization rate of each batch of sand, stone and cement entering the factory

(3) Quality fluctuations, the main reasons include: ①The setting time is too long to affect the folding time or it is too late to plaster the surface; ②Partial leakage or broken plates of components; ③Cold seams or broken piles due to vehicles not keeping up; ④Due to Excessive admixture of admixture causes the mixture to harden and grab the bottom, causing plugging of pumps and pipes; ⑤ Various cracks appear; ⑥ The construction period is rushed, the formwork turnover is fast, and early sales require the design strength to be increased or the early strength reaches 80% of the design strength~ 100% caused numerous quality problems

Analyzing the reasons for these situations, in addition to the reasons for the concrete itself, there are also reasons for some construction technicians who do not know the operation mechanism of the project very well, the performance of different additives is not fully grasped, and accidents are caused by improper use.

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