Special early strength type admixture for concrete for pre-fabricated members

Abstract

The invention provides a special early strength type admixture for concrete for pre-fabricated members. The technical problem solved by the invention is mainly to provide an admixture capable of improving the early strength of concrete for the pre-fabricated members in winter. The special early strength type admixture mainly comprises the following components in percentage by weight: 15-25% of polycarboxylate water reducing type mother liquor, 6-15% of polycarboxylate slump loss resisting type mother liquor, 6-12% of an early strength component, 3-8% of an anti-mud component, 1-3% of an anti-segregation component and the balance of water. The prepared admixture provided by the invention has the outstanding advantages that the water-reducing rate is high and the early strength effect is obvious; the adaptability to cement is good and the effect is also remarkable in the case of high mud content in sand and gravel; the raw materials used for production are free of pungent odor or toxicity and are green and environmentally-friendly; the components are free of chloride ions and have no corrosion or damage effect on reinforcing steel bars of the pre-fabricated members.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a special early-strength admixture for prefabricated component concrete. Background technique [0002] Prefabricated concrete components refer to concrete products that are processed and produced in factories through standardized and mechanized methods. The corresponding on-site pouring concrete requires on-site mold making, on-site pouring, and on-site maintenance. The quality control link is too complicated. The emergence of concrete prefabricated components has obvious advantages in improving building quality and shortening production cycle. However, due to the low early strength of modern concrete, it cannot be demoulded quickly, resulting in a low mold turnover rate, which seriously restricts the development of prefabricated components for prefabricated buildings. [0003] The patent titled "A special early-strength water reducer for prefabricated components (Chi...

AI Technical Summary

Problems solved by technology

However, this patent does not take into account the need for prefabricated components to be demoulded within 24 hours in actual production. It only compares the strength of 7d and 28d, and does not elaborate on the strength of the 3d age, which has little reference value for actual production.

[0005] Therefore, preparing a special early-strength admixture for prefabricated concrete can effectively solve the problem of low concrete 1d strength in the production process of prefabricated components in the prior art, improve the quality of prefabricated components, speed up the turnover rate of molds, and promote the use of prefabricated components in my country. Promotion and use in industrial production