Nano-micron composite concrete powder early strength agent and preparation method thereof

Abstract

The invention relates to a nano-micron composite concrete powder early strength agent and a preparation method thereof. According to the designed and prepared nano-micron composite concrete powder early strength agent, the performance advantages of nano particles and micron particles are combined, the early strength agent is well dispersed in concrete by means of the form effect of fly ash particles, and the early strength effect of a nano crystal nucleus early strength agent is fully exerted; the defects that a nanocrystal nucleus early strength agent suspension system is inconvenient to transport and use, poor in stability and the like are overcome, the early strength of the concrete can be greatly improved, and the acceleration of the secondary hydration reaction of the fly ash is also beneficial to the increase of the later strength.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of a nano-micron composite concrete powder early strength agent for improving the early strength of concrete. Background technique [0002] In winter construction, due to the drop in temperature, the development of concrete strength often slows down, which affects the construction progress, and even causes quality problems in serious cases. The rapidly developing concrete products industry also has an urgent need to improve the early strength of concrete. The strength development of concrete is closely related to the hydration rate of the main cementitious material cement. In order to improve the early strength, the existing technical methods mainly include increasing the fineness of cement, steam curing and adding early strength agents, etc., but there are different problems. The finer the cement fineness, the poorer the construction ...

AI Technical Summary

Problems solved by technology

However, due to the small particle size of nanoparticles, large surface energy, and easy adsorption and agglomeration, in order to effectively disperse, such products currently available in the domestic market are all in the form of suspensions. In order to maintain a stable state, the actual The content is very low, and a certain amount of dispersant is added to it. Even so, there is still a risk of sedimentation or gelation with prolonged storage or long transportation distances

In addition, due to the low solid content of the product, which brings inconvenience to transportation and high dosage, it is also difficult to mix with water reducing agent during concrete mixing, and it is inconvenient to put it in. It is necessary to modify the feeding equipment and adjust the concrete ratio. Realize large-scale application

[0005] If the early strength agent suspension is directly dried, the well-dispersed nano-crystal nuclei will re-attract and reunite, and it is difficult to separate each other. The effect becomes worse, and the effect of early strength drops sharply

At present, there is no mature plan to make it into a powder early strength agent without significantly reducing the early strength performance of the nanocrystalline core suspension.

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