Composite early-strength type polycarboxylate superplasticizer as well as preparation method and application thereof

Abstract

The invention relates to a composite early-strength type polycarboxylate superplasticizer as well as a preparation method and application thereof, belonging to the field of building materials. The technical problem to be solved by the invention is to provide the composite early-strength type polycarboxylate superplasticizer as well as the preparation method and application thereof. The composite early-strength type polycarboxylate superplasticizer is prepared from the following components in parts by weight: 20-50 parts of polycarboxylate superplasticizer, 2-5 parts of retarder, 30-75 parts of sodium thiosulfate, 3-10 parts of tri-isopropanolamine and 50-80 parts of water. Further, the invention also discloses the preparation method of the composite early-strength type polycarboxylate superplasticizer and the application of the composite early-strength type polycarboxylate superplasticizer in C15-C16 concrete. The composite early-strength type polycarboxylate superplasticizer disclosed by the invention has the advantages of excellent early-strength performance, relatively good compatibility among components, low alkali content, low shrinkage rate, low mixing amount and the like.

Description

technical field [0001] The invention relates to a composite early-strength polycarboxylate water reducer and its preparation method and application, belonging to the field of building materials. Background technique [0002] In recent years, the research and application of polycarboxylic acid-based high-performance water reducers have developed rapidly in my country. Due to the excellent working performance and good environmental protection of polycarboxylate superplasticizers, many domestic application companies have begun to choose polycarboxylate superplasticizers from high-speed railways, passenger lines to ports, airports, and urban commercial concrete mixing stations. As an indispensable fifth component of concrete. However, due to the short application and development time of polycarboxylic acid-based high-performance water-reducers in my country, the research on its application technology is still in its infancy, and the classic theory and general experience of comp...

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Problems solved by technology

In recent years, many provinces in the southern region, including Sichuan, have generally experienced heavy snow and freezing weather after entering winter. Concrete is often faced with low temperature or even negative temperature (below zero) construction conditions. a lot of inconvenience

Taking the reconstruction project of the Second Ring Road in Chengdu in 2013 as an example, in the face of tight time, heavy tasks, and low construction temperature in winter, in order to meet the requirements of 4-day tensioning of prefabricated beams on site (greater than 80% of the design strength), if According to the traditional method, measures such as improving the strength level of concrete and steam curing have to be adopted, which will increase the amount of cementitious materials, increase the overall cost, and eventually cause a waste of natural and social resources.

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