Super-early-strength fluoride-free alkali-free liquid accelerator and preparation method thereof

Abstract

The invention relates to a super-early-strength fluorine-free alkali-free liquid accelerator and a preparation method thereof. The accelerator is prepared from the following raw materials: aluminum sulfate, an organic dissolution promoter, a stabilizer, an early strength agent, a pH regulator and water. The organic dissolution promoter is formed by mixing a component A, a component B and a component C, wherein the component A is monoethanolamine, diethanolamine or triethanolamine; the component B is N-methyldiethanolamine, N,N-dimethylethanolamine or N,N-dimethylformamide; and the component C is diethylenetriamine, triethylene tetramine or tetrahydroxypropyl ethylenediamine. The stabilizer is selected from superfine sepiolite and pseudo-boehmite. The pH regulator is selected from p-toluenesulfonic acid, oxalic acid and formic acid. The early strength agent is selected from lithium sulfate, magnesium sulfate, nanometer silica sol and nanometer aluminum sol. The super-early-strength fluorine-free alkali-free liquid accelerator is good in performance, simple in preparation process, free of fluorine, alkali and chlorine and capable of meeting the performance requirements of various setting accelerator standards for alkali-free accelerators; and according to the liquid accelerator, compressive strength within 6 hours is far larger than 2.5 MPa, compressive strength within 1 day is far larger than 15.0 MPa, a compressive strength retention rate within 90 days is larger than or equal to 110%, and stability exceeds 9 months.

Description

technical field [0001] The invention relates to a liquid quick-setting agent, in particular to a super-early-strength type fluorine-free and alkali-free liquid quick-setting agent, which belongs to the technical field of building materials. The present invention also relates to a preparation method of the liquid quick-setting agent, in particular to a preparation method of a super-early-strength type fluorine-free and alkali-free liquid quick-setting agent. Background technique [0002] Shotcrete plays an increasingly important role in my country's infrastructure construction and urban construction projects, and its consumption is increasing. Especially in the process of high-speed railway and highway construction, there are more and more tunnel construction projects, which put forward higher and higher requirements for the performance of shotcrete. The Ya'an-Nyingchi section of the Sichuan-Tibet Railway is about 1,011 kilometers long. The construction of the "two tunnels a...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the alkali-free liquid accelerator products use industrial-grade aluminum sulfate as the main accelerator component, and the following problems generally exist: (1) The alkali content exceeds the standard

[0007] The above technologies have a great impact on how to make the ultra-early-strength fluorine-free and alkali-free liquid accelerator perform well, and at the same time meet the requirements of the two accelerator standards of Q / CR 807-2020 and GB / T 35159-2017 on the alkali-free accelerator. Performance requirements, 6-hour compressive strength and 1-day compressive strength are high, no specific guidance plan is given

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