High-strength alkali-free setting accelerator used for cementing material containing cement and preparation method

Abstract

The invention discloses a high-strength alkali-free setting accelerator used for a cementing material containing cement and a preparation method. The cementing material is prepared from, by weight, 15-25% of aluminium dihydrogen phosphate, 10-15% of monomagnesium phosphate, 0.01-0.1% of antifoaming agent, 20-30% of polyhydroxy dispersing enhancer; 2-5% of modified stabilizer, 3-6% of sulfonated graphene and the balance water, and the total weight is 100%. The alkali content in the alkali-free liquid setting accelerator is less than 1%, the possibility that sprayed concrete generates an alkali-aggregate reaction is greatly reduced, and the durability of concrete is improved; according to the prepared setting accelerator, no sulfate is introduced, and the sulfonated graphene is introduced inthe sulfonated graphene system, so that the setting accelerator not only can strengthen the early compression resistance strength of the concrete but also is quite beneficial for the growth of the long-term strength of the sprayed concrete.

Description

technical field [0001] The invention relates to a high-strength alkali-free quick-setting agent for cement-containing binders and a preparation method. Background technique [0002] Accelerator is an admixture that makes cement-containing cement harden quickly and produce a certain strength. It is widely used in tunnel spraying mortar or concrete construction and emergency repair construction. Its main purpose is to speed up the setting time of cement and speed up construction. Reduce springback, improve early strength without reducing later strength, and meet the construction requirements of special projects. [0003] In the construction process of spraying the cement-containing cement through the nozzle, the cement cement must be solidified within a specified time to speed up the spraying construction speed; the alkali-free accelerators currently used are all based on aluminum sulfate. High sulfate content. The alkali-free quick-setting agent disclosed in the patent (CN1...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems faced by the above-mentioned non-alkali quick-setting agent, and provide a kind of high-strength type non-alkali quick-setting agent for cement-containing cement; The preparation method of the high-strength alkali-free quick-setting agent of material

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