Underwater anti-dispersion large particle size porous concrete and preparation method thereof

Abstract

The invention discloses underwater dispersion-resistant porous concrete with a large particle size. The underwater dispersion-resistant porous concrete comprises the following raw materials: aggregate, cement, mineral admixture, water and a thickener, wherein a mass ratio of the sum of the cement and the mineral admixture to the aggregate is 0.19-0.23; the mineral admixture is micron silicon powder and nano calcium carbonate, wherein the micron silicon powder accounts for 0%-10% of the cement, and the nano calcium carbonate accounts for 0%-1% of the cement; the thickener accounts for 2%-4.5% of the sum of the cement and the mineral admixture; the aggregate is graded aggregate with the particle size of 5mm-20mm; and water accounts for 0.25-0.35 of the sum of the cement and the mineral admixture. The invention further discloses a preparation method of the concrete. The concrete has underwater dispersion-resistant self-leveling property and is not isolated under vibration and underwater environment, and uniform in hole structure uniformity. As a pile body material, the underwater dispersion-resistant porous concrete can realize rapid pulling of a sleeve during vibration immersed tube method construction, generates little disturbance on soil around the pile and does not have pile breakage and hole shrinkage; moreover, the underwater dispersion-resistant porous concrete has good anti-blocking ability.

Description

technical field [0001] The invention relates to a concrete structure material technology, in particular to an underwater anti-dispersion large particle diameter porous concrete and a preparation method thereof. Background technique [0002] Porous concrete is a concrete with a porous structure with air-permeable and water-permeable properties, which is composed of a series of connected pores and the skeleton of the concrete entity. Porous concrete is a heterogeneous material formed by cement slurry wrapping aggregates and aggregates intercalating. In the freshly mixed porous concrete material, the cement slurry wrapped on the surface of the aggregate is easy to segregate, which causes the uneven distribution of the pore structure in the porous concrete, which makes the porous concrete clogged and loses the effect of water permeability and air permeability. [0003] When the freshly mixed porous concrete is in the underwater environment, the water in the environment will was...

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Problems solved by technology

However, during the vibration process, the cement slurry wrapped on the aggregate surface is easily separated from the aggregate due to the action of external force, resulting in uneven distribution of cement slurry in the concrete material to block the pore structure.

[0005] Ordinary porous concrete has little slump or no slump. When porous concrete is used as the pile structure material, in order to avoid pile breakage and diameter shrinkage in the process of pile formation by vibrating sinking tubes, low speed is used. The pulling speed should be controlled at a uniform speed. The pipe speed should be controlled at about 1.2m / min to 1.5m / min. When encountering silt or silty soil, the speed of pipe removal should be slowed down appropriately. Too slow pipe removal will disturb the soil around the pile too much and weaken the bearing capacity of the single pile. and the bearing capacity of the composite foundation, the permeation effect of the soil around the disturbed pile is not good, so the drainage effect of the porous concrete pile will also be reduced

[0006] Iowa State University’s research shows that when the porosity of porous concrete is low (≤20%), the porous concrete’s ability to resist the blockage of fluids such as mud is poor. When a certain volume of mud-rich fluid passes through the porous concrete, the porous concrete’s The effective porosity will decrease rapidly, and its water-permeable and air-permeable efficiency will be greatly reduced

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