A large fluidity and high resistance to dispersion cast-in-situ pile concrete containing machine-made sand and dust-collecting stone powder

Abstract

The invention belongs to the technical field of building materials. The invention discloses a large-fluid high-dispersion-resistant pouring pile concrete containing machine-made sand and dust-collecting stone powder. The invention uses triisopropanolamine and triethanolamine as dispersion and ion-promoting solvents. Through the aging process, the triisopropanolamine and triethanolamine are strongly adsorbed on the surface of the machine-made sand dust collection stone powder, and the reactivity of the machine-made sand dust collection stone powder is improved, and then the mechanical force is used to activate the triisopropanolamine and triethanolamine and the dissolved calcium, The complex chemical bonds between silicon ions improve the dispersion of stone powder particles. When it is used to prepare cast-in-situ pile concrete, the calcium and silicon plasma in the modified dust-collecting stone powder participate in the hydration of cement and improve the strength of concrete. In addition, the compounding and mixing of nano-silica in the present invention promotes cement hydration, and can effectively improve the cohesion and water retention of the prepared pouring pile concrete, thereby greatly improving its underwater dispersion resistance. It is of great significance for the preparation of pouring pile concrete with large fluidity and high dispersion resistance.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a pouring pile concrete with large fluidity and high dispersion resistance containing machine-made sand and dust-collecting stone powder. Background technique [0002] The construction of underwater cast-in-place piles is a method of pouring concrete through the conduit and relying on the concrete's own weight to form a dense body. The depth of the pile foundation of highway and railway bridges is generally more than 20m, and the pile foundation depth of some river-crossing bridges can exceed 100m. In order to ensure the quality of underwater concrete pouring piles, in addition to the strength, impermeability, and durability of the prepared concrete, the mixture should have high cohesion, anti-dispersion, and anti-segregation capabilities, and can self-flow underwater Flat and self-compacting to form homogeneous and dense concrete, preventing the quality of the pile bo...

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Problems solved by technology

[0005] In view of this, the present invention uses the dust-collecting stone powder in the dry production of machine-made sand as a raw material, and uses it to prepare cast-in-situ pile concrete, so as to solve the problem of the high amount of concrete glue used in existing cast-in-situ piles and the difficulty in producing dust-collecting stone powder by the dry method of machine-made sand. The problem of local use

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