Application of mud-resistant slump-retaining type water reducer to machine-made sand concrete prefabricated component

Abstract

The invention discloses application of a mud-resistant slump-retaining type water reducer to a machine-made sand concrete prefabricated component and discloses the machine-made sand concrete prefabricated component comprising the mud-resistant slump-retaining type water reducer. The mud-resistant slump-retaining type water reducer developed by the invention is of a clustered molecular structure and contains a large number of amine cations with early-strength functions, thereby having multiple functions of mud resistance, slump retaining, early strength and the like and the mud-resistant slump-retaining type water reducer is applied to the machine-made sand concrete prefabricated component, thereby being capable of effectively improving the early-stage strength of the concrete while retaining slump of the concrete, avoiding steam curing and curing under natural conditions to achieve the mould stripping strength within 9 to 12 hours, and not adding any mineral reinforced materials and glass fibers to greatly reduce the production cost and the mould turnover cycle. Furthermore, the mud-resistant slump-retaining type water reducer in the machine-made sand concrete prefabricated component is a key technology node for achieving prefabricated assembly construction, fills up the domestic blank and has greater economic and social significance.

Description

technical field [0001] The invention relates to the technical field of water reducers, in particular to the use of a mud-resistant and slump-preserving water reducer in machine-made sand concrete prefabricated components. Background technique [0002] Prefabricated concrete components are the key technical points to promote the industrialization of construction, popularize green buildings, and realize prefabricated houses. Prefabricated components can be mass-produced in a factory, which is beneficial to construction and speeds up the progress. The application of precast concrete technology can reduce environmental pollution and achieve greater economic benefits. Precast concrete structures have great development prospects in our country. [0003] Precast concrete components have the following characteristics: [0004] 1. The structural performance is good, and the factory production can effectively ensure the mechanical properties of the structure, and the discreteness is ...

AI Technical Summary

Problems solved by technology

However, the addition of early-strength water-reducing agent, while accelerating the hydration of cement and improving the early strength of concrete, often leads to a large loss of concrete slump over time, which is not conducive to the pouring of concrete, the compactness of concrete structure and the uniformity of concrete strength.

[0014] With the rapid development of my country's construction industry in the past 30 years, the annual use of concrete is huge, accompanied by a huge consumption of concrete raw materials. At present, the natural sand for concrete production is almost exhausted, and the use of artificial machine-made sand is becoming more and more important. It is inevitable, but the high content of machine-made sand and mud powder leads to the high amount of mixing water and admixture in the use of concrete, and the large loss of slump over time, which seriously affects the workability and construction performance, while the high soil content , is the root cause of the large slump loss of machine-made sand concrete. At present, there is a lack of high-quality admixtures in the market that match the high mud content of machine-made sand, which directly limits the use and promotion of machine-made sand in precast concrete components.

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