Preparation method of salt-erosion-resistant marine concrete

Abstract

The invention relates to a preparation method of salt-erosion-resistant marine concrete, and belongs to the technical field of building material preparation. The method comprises the steps that firstly, rice hulls rich in silicon source is mixed with biogas slurry, and micro-decomposition treatment is conducted on the rice hulls by utilizing microorganisms in the biogas slurry to obtain porous rice hulls; then, the porous rice hulls and a citric acid solution are mixed and impregnated, so that the citric acid solution is loaded in internal pores of the porous rice hulls; then, the metal ion chelating capability of citric acid is utilized, and chlorine ions in an aluminum chloride solution are chelated and fixed in the micropores of the porous rice hulls; finally, precipitation is conductedwith a sodium hydroxide solution to prepare the porous rice hulls with aluminum hydroxide in the pores, then rice hull ash internally provided with aluminum oxide is obtained through calcining, thenthe rice hull ash, oyster shell powder and castor oil are mixed to obtain self-made salt-resistant filler, and the self-made salt-resistant filler and other concrete raw materials are mixed and stirred to obtain the salt-erosion-resistant marine concrete. The marine concrete prepared through the method has excellent salt erosion resistance, high in mechanical strength and wide in application prospect.

Description

technical field [0001] The invention relates to a preparation method of salt erosion-resistant marine concrete, which belongs to the technical field of building material preparation. Background technique [0002] With the increasing number of various concrete cross-sea bridges and harbor projects, the problem of durability in the process of use has gradually emerged. Due to the harsher marine environment than that on land, marine concrete suffers from various salts in seawater, especially chloride and sulfate corrosion, which leads to corrosion of steel bars and premature damage of concrete structures and loss of durability. , which seriously threatens its normal service life. The damage to reinforced concrete structures caused by chloride and sulfate is one of the most important factors for the insufficient durability of concrete structures. The main reason is that when the concentration of chloride and sulfate exceeds a certain value, it can Destroy the passivation film o...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention is aimed at the fact that the current traditional marine concrete suffers from the corrosion of various salts in the seawater, especially the chloride salt and the sulfate, due to the fact that the traditional marine concrete is in a harsher marine environment than on land, which leads to the corrosion of steel bars The defect that causes the concrete structure to be damaged prematurely and loses its durability, thus seriously threatening its normal service life, provides a preparation method for salt erosion-resistant marine concrete

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