Shotcrete springback inhibitor and using method thereof

Abstract

The invention discloses a shotcrete springback inhibitor and a using method thereof. The springback inhibitor is prepared by mixing the following raw materials: 50%-60% of a composite admixture, 15%-30% of nano calcium silicate, 15%-25% of an efficient water reducing agent, 1%-5% of redispersible latex powder, 1%-5% of a water retaining agent, 1%-5% of a thickening agent and 0.5%-1.0% of an exciting agent. When shotcrete is prepared, cement, sand, stone and the springback inhibitor are added into a stirrer together to be stirred; the mixing amount of the springback inhibitor is 3-8% of the total consumption of the cementing material. According to the shotcrete springback inhibitor and the using method thereof of the invention, under the condition that a water reducing agent is not added and the mixing amount of an accelerator is reduced, the springback rate of the shotcrete is greatly reduced, the working performance of the shotcrete is improved, meanwhile, the mechanical property andthe durability are improved. The method is particularly suitable for preparing the high-performance shotcrete. The one-time spraying thickness of the shotcrete can reach 50 cm or above, the early strength of the shotcrete is remarkably improved, the adverse effects of the accelerator on the strength, durability and the like of the shotcrete are avoided, the construction efficiency is improved, andthe engineering cost is saved.

Description

technical field [0001] The invention relates to a shotcrete rebound inhibitor, belonging to the technical field of concrete admixtures, and also relates to a method for using the shotcrete rebound inhibitor. Background technique [0002] Wet shotcrete is the concrete that is pre-mixed according to the slump requirements. The spraying does not produce dust, the construction environment is good, the rebound rate is relatively low, the compactness of the shotcrete is improved, and the strength is also improved. Due to the significant advantages of wet sprayed concrete, it has been gradually applied. However, in some constructions, the design and control of concrete mix ratio is not strict, and the control of construction technology is not strict, which also causes the high rebound rate of wet sprayed concrete, resulting in a large waste of raw materials. [0003] Limited by the wet spraying process itself, the concrete will inevitably spring back during the spraying constructi...

AI Technical Summary

Problems solved by technology

This will cause three problems: First, because the rebound material is difficult to reuse, the loss and cleaning of the rebound material will greatly increase the construction cost; second, the rebound material will also increase the dust concentration in the air, which is not conducive to construction The personal health of personnel; the third is that the springback material is mainly coarse aggregate, and the loss of coarse aggregate is similar to increasing the amount of cementitious material and sand ratio in shotcrete, which increases the risk of shrinkage and cracking of shotcrete. good for its durability

[0006] The above technologies have a great impact on how to make the rebound inhibitor of shotcrete greatly reduce the rebound rate of shotcrete, improve the working performance of concrete, improve the strength and durability of concrete, reduce the risk of concrete cracking, and reduce the risk of concrete cracking while reducing the amount of accelerator. No specific guidelines given

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