Multi-component composite synergist for shotcrete and preparation method of multi-component composite synergist

Abstract

The invention provides a multi-component composite synergist for shotcrete and a preparation method of the multi-component composite synergist. The multi-component composite synergist comprises the following components: 20-40% of nanoscale silica fume; 30-50% of modified mineral powder, 10-20% of an expanding agent, 0-5% of a crystal nucleus early strength agent, 1-5% of a fluidizing agent, 1-5% of sodium tripolyphosphate, 0.5-2% of sodium carboxymethyl cellulose, 0.5-2% of sodium gluconate, 5-10% of sodium thiocyanate, 0-0.5% of polypropylene fiber and 0.05-0.2% of an organic silicon defoamer. Compared with the prior art, the working performance and the pumpability of the shotcrete are remarkably improved; the rebound rate and the dust amount of the shotcrete are reduced; the shrinkage ofthe shotcrete is reduced, the pore structure of the shotcrete is improved, and the compactness, strength and cracking resistance of the shotcrete are improved so that the shotcrete has good durability and is non-toxic, pollution-free, simple in production process and zero-emission in production, and belongs to a green and environment-friendly material.

Description

technical field [0001] The invention belongs to the technical field of concrete, in particular to a multi-component composite synergist for shotcrete and a preparation method thereof. Background technique [0002] Shotcrete is a kind of special concrete that is evenly sprayed on the surface to be sprayed by the concrete transported by the pipeline under the action of high compressed air, automatically compacted and quickly generates strength. Compared with cast-in-place concrete, machine spraying construction has the advantages of short setting time, high early strength, convenient construction, shortened construction period, and cost saving. It is widely used in tunnel lining, mine roadway support, foundation pit support and other projects. [0003] In the actual construction process, on the one hand, shotcrete should have good construction performance, suitable setting time, high early strength, and low rebound rate of construction concrete; on the other hand, it should ha...

AI Technical Summary

Problems solved by technology

[0005] In improving the anti-permeability of shotcrete, mineral admixtures have obvious effects, such as silica fume and fly ash. Among them, the invention patent 201210343040.7 published on December 19, 2012 "Nano-scale shotcrete modification Admixture", the invention patent application 201810248219.1 "a shotcrete admixture" published on August 17, 2018, the invention patent application 201510968974.3 "an early-strength shotcrete" published on April 20, 2016, 2018 Invention patent 201810036120.5 "a high-strength low-resilience shotcrete and its construction technology" published on May 18, and an invention patent application 201710085030.0 published on June 27, 2017 "a high-strength ultra-fine sprayed concrete admixture", Invention patent 201811330392.2 "a nano-scale admixture for wet shotcrete and its use method" published on January 25, 2019, all added silica fume to obtain the significant effect of reducing the rebound of shotcrete; however, it did not change the spraying Concrete porosity, pore structure and compactness

Moreover, the use of nano-scale silica fume is large and costly

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