Sprayed concrete and preparation method thereof

Abstract

The invention discloses sprayed concrete and a preparation method thereof. The sprayed concrete includes cement, fine aggregate, glass fiber, fly ash, a water reducing agent, a water-retaining agent,nano SiO2 according to the ratio of 100:100-120:2.0-2.5:15-25:0.5-1.5:0.10-0.15:5-7. The preparation method includes: 1) according to the ratio, weighing the raw materials and water; 2) adding the water reducing agent and nano SiO2 to a part of water and performing ultrasonic vibration continuously to form a water solution; 3) blending and stirring the cement, the rest of water, the fine aggregate, and the fly ash to form mortar; 4) adding the glass fibers, the water-retaining agent and the water solution in step 2) to the mortar and uniformly stirring the components. The sprayed concrete is high in whole life strength, is not liable to crack and has good interfacial adhesion performance. The sprayed concrete can be applied to the fields of underground construction supporting, reinforcement of buildings, and protective engineering.

Description

Technical field [0001] The invention patent discloses a sprayed concrete and a preparation method thereof, and belongs to the field of civil engineering materials. Background technique [0002] Shotcrete is a kind of concrete that uses compressed air or other power and spray machinery to transport a certain proportion of mixed materials through a pipeline and spray it on the sprayed surface at a high speed to set and harden. When spraying from the nozzle at high speed, cement particles and aggregate particles will continue to collide repeatedly, so the concrete can be compacted without vibration. At the same time, the sprayed concrete uses a relatively small amount of water and dust, which can further improve its compactness, thereby having higher mechanical strength and good durability. Due to the characteristics of its materials and processes, sprayed concrete is currently widely used in the fields of underground engineering support, building reinforcement and protection engin...

AI Technical Summary

Problems solved by technology

But if nano-SiO 2 Excessive amount of nano-SiO 2 There will be agglomeration, and a large amount of water will be consumed. In the absence of sufficient water to ensure the hydration of cement, the internal defects of concrete will increase, resulting in a decline in quality and weakened overall performance.

In addition, due to nano-SiO 2 Absorption of water reduces the overall fluidity of the concrete, which may lead to clogging during spraying