Cement clinker hydration suspension concrete early strength agent and application thereof

Abstract

The invention relates to preparation and application of a cement clinker hydration suspension concrete early strength agent. The cement clinker hydration suspension concrete early strength agent is composed of a phosphonic acid-based dispersant which is adopted as a template, and ground Portland cement clinker adopted as a nucleating substance. Polyphosphonic acid groups in the dispersant are usedas anchoring groups of hydrated C-S-H, and a methoxypolyethylene glycol (MPEG) long chain provides a steric hindrance effect, so that the effects of stably dispersing and controlling the crystal nucleus size are achieved, and coagulation of a crystal nucleus suspension is avoided. The crystal nucleus particle size of the prepared cement clinker hydrated suspension concrete early strength agent can reach 30-120 nm; the early strength agent has more outstanding early strength performance, and can effectively shorten the initial setting time and the final setting time of concrete; and under thenatural curing condition, the strength of the concrete can reach 15 MPa or above after 6 h.

Description

technical field [0001] The invention relates to the field of concrete additives, in particular to a cement clinker hydration suspension concrete early strength agent and its application. Background technique [0002] Improving the early strength of cement concrete has been an important indicator pursued by many concrete applications. In recent years, the development of prefabricated buildings and urban pipe corridors has greatly promoted the development of the precast concrete industry. In order to quickly achieve the demolition strength (≥15MPa) and shorten the mold turnover period, steam curing or autoclaving curing is often used for prefabricated components to promote the rapid development of early strength of concrete, but improper steam curing operation will cause steam cured concrete. Quality defects, while steaming increases production costs, is also not conducive to environmental friendliness. [0003] In recent years, the use of nano-materials such as nano-silicon...

AI Technical Summary

Problems solved by technology

However, the cost of calcium source and silicon source used in this type of crystal nucleus early strength agent is high, and the prepared crystal nucleus has a large particle size (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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