Wet sprayed ultra-high performance concrete rheological property modifier and using method thereof

Abstract

The invention discloses a wet spraying ultra-high performance concrete rheological property regulator and a method for using the same. Viscosity, reduce the pump pressure during spraying, increase the yield stress of ultra-high performance concrete through anti-sagging components, and combine early strength components to synergistically improve the bonding performance of the material after spraying, effectively improving the sprayability of sprayed ultra-high performance concrete Therefore, it can reduce the rebound rate, increase the thickness of one spraying, improve the compactness, and realize the continuous wet spraying construction of ultra-high performance concrete.

Description

technical field [0001] The invention relates to the technical field of ultra-high performance concrete modification. More specifically, the present invention relates to a wet-sprayed ultra-high-performance concrete rheological property regulator and its application method. Background technique [0002] In recent years, on the one hand, China's large-scale infrastructure construction projects are increasing, which puts forward higher requirements for the durability of concrete. Reinforcement, shotcrete has been paid more and more attention as a reinforcement and repair material. Shotcrete is a combination of pre-prepared cement used as a cementitious material, sand, stones, water used as aggregate, and a certain amount of admixtures such as water reducing Put it into the jetting machine and use high-pressure air to send it to the nozzle and mix it with the accelerator, and spray it to the surface of rock or concrete at a high speed to form it. However, at present, shotcrete ...

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Problems solved by technology

[0002] In recent years, on the one hand, my country's large-scale infrastructure construction projects are increasing, which puts forward higher requirements for the durability of concrete. Reinforcement, shotcrete has been paid more and more attention as a reinforcement and repair material. Shotcrete is a combination of pre-prepared cement used as a cementitious material, sand, stones, water used as aggregate, and a certain amount of admixtures such as water reducing Put it into the jetting machine and use high-pressure air to send it to the nozzle and mix it with the accelerator, and spray it to the surface of rock or concrete at a high speed to form it. However, at present, shotcrete generally has low strength and poor toughness in the later stage. , large drying shrinkage, easy cracking, poor durability and environmental adaptability and other poor rheological properties, and ultra-high performance concrete, referred to as UHPC, as a new type of cement-based engineering material with ultra-high impermeability and mechanical properties, Applying it to spraying construction can greatly solve the common problems of sprayed concrete at present. However, due to the large amount of cementitious materials used in ultra-high performance concrete, the viscosity is high and the pump pressure required during spraying construction is much higher. Compared with ordinary concrete, it is easy to burst the pipe

In order to reduce the viscosity, it is usually based on the premise of sacrificing the strength of concrete. In addition, there is also the problem of high rebound rate. Therefore, how to improve the rheological properties of wet sprayed ultra-high performance concrete, reduce the viscosity before spraying and improve the viscosity after spraying. Excellent bonding performance, yield stress, and reducing the rebound rate have become difficult problems

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