Hydrated crystal nucleus concrete coagulation accelerating early strength agent and preparation method thereof

Abstract

The invention relates to preparation and application of a hydrated crystal nucleus concrete coagulation accelerating early strength agent, which takes a water-soluble polymer dispersant as a template and ground Portland cement clinker as a nucleating substance to prepare a hydrated crystal nucleus suspension. Through the synergistic effect of different functional groups of the polymer dispersing agent and the special design of the molecular structure, the polymer dispersing agent can be quickly adsorbed to the surface of the instantly generated C-S-H crystal nucleus and has a stable dispersing effect, meanwhile, the C-S-H crystal nucleus is prevented from further growing and becoming larger, the size (30-120 nm) of the crystal nucleus is effectively controlled, and coagulation of crystal nucleus suspension liquid is avoided. The crystal nucleus suspension can significantly promote the hydration of cement, quickly improve the early strength of concrete, effectively shorten the initial and final setting time of concrete, meet the form removal strength requirements of prefabricated parts within 6-8 hours under natural conditions, and greatly shorten the mold turnover period.

Description

technical field [0001] The invention relates to the field of concrete additives, in particular to a hydration crystal nucleus concrete coagulation accelerator and early strength agent and a preparation method thereof. Background technique [0002] With the continuous development of modern concrete technology, the requirements for the early strength of concrete are getting higher and higher, and the demand for concrete prefabricated components is increasing sharply. One of the most important indicators for the production of prefabricated components is the development of early concrete strength, that is, rapid Reach the mold removal strength (≥15MPa), in order to facilitate the rapid turnover of molds, shorten the turnover period of molds, and save production costs. [0003] At present, the use of steam curing technology is a common method to improve the early strength of precast concrete components, but improper steam curing operation will cause quality defects in steam cured...

AI Technical Summary

Problems solved by technology

However, the cost of calcium source and silicon source used in this kind of crystal nucleus early strength agent is high, and the particle size of the prepared crystal nucleus is relatively large (the particle size can only reach 100-500nm), and the number of crystal nucleus per unit volume is small, which promotes cement hydration The rate is slow, and the ultra-early strength performance and coagulation-accelerating effect are still insufficient. At the same time, the crystal nuclei are prone to agglomeration, and cannot be stored stably for a long time, which restricts its application in the concrete industry.

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