A kind of phosphorus-magnesium-based cement shotcrete material and its preparation method and application

Abstract

The invention provides a phosphorus-magnesium-based cement shotcrete material and its preparation method and application, belonging to the technical application field of shotcrete materials. The sprayed grouting material is made of the following materials in parts by weight: 40-70 parts of composite magnesium compound, 0.5-3 parts of composite retarder, 0.3-0.8 parts of water reducer, 10-40 parts of phosphate, 0.5-1.5 parts of tackifier, 0.3-0.7 parts of fiber. Weigh the shotcrete material in proportion and mix it with sand in a ratio of 1:3, where the sand is medium sand or coarse sand: fine sand is a mixed sand of 4:1, and then mix the shotcrete material with sand Then mix it with water at a ratio of 100:15~30 to form a slurry, and mix it evenly to get the product. The phosphorus-magnesium-based cement spraying material of the present invention has high early strength, high compressive and flexural strength, low rebound rate, good cohesion, no dust pollution, high support strength, good workability and impermeability, Low cost, convenient and simple construction, green environmental protection and other advantages.

Description

technical field [0001] The invention belongs to the technical application field of shotcrete materials, and in particular relates to a phosphorus-magnesium-based cement shotcrete material, a preparation method and an application thereof. Background technique [0002] With the frequent occurrence of disasters such as landslides, mudslides, tunnel collapses, rock falls, and local landslides in recent years, pre-disaster prevention and post-disaster rapid repair issues have received more attention. The use of shotcrete technology for slope repair, surrounding rock support, roadway repair and reinforcement, leak plugging, and rapid road repair and reinforcement is undoubtedly the best way to solve this problem. Shotcrete is a fast-setting concrete used to strengthen and protect structures or rock surfaces. [0003] Now, the commonly used high-strength bolt-shotcrete support technology occupies an important position in my country's coal mine production, but with the increase of ...

AI Technical Summary

Problems solved by technology

[0004] 1. The cracking of the spray layer is caused by the lack of toughness of the spray layer material itself, which causes cracks, bursts or whole pieces to fall off

[0005] 2. The delamination problem of the spray layer is caused by the low adhesion between the material and the interface

[0006] 3. The rebound rate of the shotcrete material is as high as 35-40%, and the cohesiveness is poor, resulting in a large amount of waste of ground material, the mortar coagulates slowly, and the supporting effect is slow

[0007] 4. The dust concentration is high, seriously polluting the underground air and working environment, affecting safe production and endangering the physical and mental health of workers

[0008] 5. The ingredients and performance are single, and most of the components are rigid. The material is rigid and brittle, not flexible enough, and poor in compactness. It is very easy to cause the traditional shotcrete material to crack and fall off, which in turn causes hidden dangers such as water leakage, gas overflow, and support mortar collapse.

[0009] 6. The spraying process is difficult to grasp, the on-site mixing ratio is not easy to grasp, the workers' operation is random, and the quality control is difficult

At the same time, it can also solve the problems of slow support speed, long support time, and rebound and dust problems in shotcrete support.

[0011] Chinese patent CN100591502 discloses "Dry Mixed Shotcrete Material and Preparation Method for Coal Mine Underground Roadway", which uses cement, quartz sand or stone powder, calcium carbonate, cellulose, fiber, etc. to mix and stir into a shotcrete material, which has light weight and high strength , high adhesion, and convenient construction, but the cost is high, and the field adjustability is poor, it is difficult to meet the current engineering needs, and it is difficult to be widely used

[0012] Chinese patent CN105110718B discloses "a kind of dry-mixed grouting material for underground anchor mesh support with high fly ash and coal gangue", which is composed of pollutant fly ash, coal gangue, slag powder and waste microsilica powder, And cement, silica, naphthalene-based water reducing agent, polypropylene fiber, to ensure the durability and long-term performance of the concrete sprayed layer, improve the bonding strength, and solve the problems of wasting resources and polluting the environment, but the early strength of the material is relatively low Poor, long effective time, difficult to meet the requirements of rapid construction, and insufficient permeability leads to small repair range, insufficient ability to repair deep cracks and narrow cracks

However, this type of product has poor deep expansion ability and poor permeability, and requires multiple constructions during on-site construction, which is labor-intensive and time-consuming

[0014] Therefore, it is necessary to develop a new type of spraying material that overcomes the poor toughness, poor cohesiveness, high rebound rate, many falling materials, easy cracking, large dust, and no anti-leakage and anti-gas leakage functions of the existing traditional shotcrete materials. It will play a very important role in improving coal mine and tunnel safety production, mountain disaster prevention and reconstruction