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A kind of corrosion-resistant concrete used in sulfate brine environment and its production and construction technology

A technology of corrosion-resistant concrete and sulfate, applied in the field of civil engineering materials, to achieve the effect of low cost, easy operation and simple construction process

Inactive Publication Date: 2015-11-11
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the durability problem of structure concrete in the sulfate brine environment, the invention provides a corrosion-resistant concrete used in the sulfate brine environment and its production and construction process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Reinforced concrete precast piles are used to enhance the bearing capacity of the foundation in a sulphate brine environment. The designed pile length is 8m, the cross section is 50cm×50cm, and GFRP bars are used as the concrete reinforcement, which is made in the precast factory. According to the engineering survey report, the stable water level depth: 2m, the salt content of saline soil: 37.42%, and the main ion content: Ca 2+ :0.09%, Mg 2+ : 1.54%, K + And Na + : 17.08%, SO 4 2- : 18.09%, Cl - :0.59%, HCO 3 - :0.03%; The salinity of brine is 386.8g / L, and the range of main ion salinity in brine is (g / L): K + And Na + : 150.28, Ca 2+ : 0.84, Mg 2+ : 42.28, Cl - : 2.81, SO 4 2- : 190.51, HCO 3 - : 0.08. According to the salt content of the saline soil, the salinity of the brine, and the type and concentration of the salt in the saline soil and the brine, the concrete is prepared in parts by weight of the following raw materials:

[0030] Lightly burned magnesium oxide powd...

Embodiment 2

[0034] The concrete of the present invention is used in the construction of highway culvert in a certain sulfated soil area, and stainless steel is used as the reinforcing material. According to the engineering survey report, the salt content of the saline soil in this area is: 15.32%, and the main ion content is: Ca 2+ : 1.27%, Mg 2+ : 0.28%, K + And Na + : 6.11%, SO 4 2- : 6.49%, Cl - : 0.75%, HCO 3 - : 0.30%, CO 3 2- :0.12%; According to the salt content of the saline soil and the type and concentration of the salt in the saline soil, the concrete is prepared according to the weight parts of the following raw materials:

[0035] Lightly burned magnesium oxide powder: 250 parts; magnesium sulfate: 35 parts; coarse aggregate: 300 parts; fine aggregate: 250 parts; water: 120 parts; citric acid: 5 parts; sodium citrate: 5 parts; oxalic acid: 5 ; Sodium silicate: 5 parts; Acetic acid: 3 parts; Acrylic emulsion: 5 parts; Fly ash: 30 parts; Ground slag: 30 parts; Calcined coal gangue ...

Embodiment 3

[0038] A brine pond was built in a saline soil area, using the concrete construction of the present invention, the salt content of the saline soil: 46.9%, and the main ion content: Ca 2+ : 4.26%, Mg 2+ : 1.54%, K + And Na + : 22.05%, SO 4 2- : 23.05%, Cl - : 4.72%, HCO 3 - : 0.96%, CO 3 2- :0.27%; The salinity of brine is 494g / L, and the range of main ion salinity in brine is (g / L): K + And Na + : 143.71, Ca 2+ : 28.77, Mg 2+ : 42.28, Cl - : 35.92, SO 4 2- : 242.86, HCO 3 - : 0.26, CO 3 2- : 0.2. According to the salt content of the saline soil, the salinity of the brine, and the type and concentration of the salt in the saline soil and brine, the concrete is prepared according to the weight parts of the following raw materials:

[0039] Lightly burned magnesium oxide powder: 600 parts; Magnesium sulfate: 200 parts; Coarse aggregate: 1500 parts; Fine aggregate: 1000 parts; Water: 350 parts; Citric acid: 10 parts; Ammonium citrate: 3 parts; Dihydrogen phosphate Ammonium: 5 parts; S...

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Abstract

The invention discloses anti-corrosion concrete applied to a sulfate bittern environment as well as a preparation and construction technology thereof. The concrete comprises the following raw materials: light calcined magnesia, magnesium sulfate, water, aggregate, a mineral admixture and an additive. Through mutual effect among the components of the concrete and with the sulfate bittern environment with specific salt type and concentration, the concrete can be condensed and hardened, generated, developed and strength-maintained in sulfate saline soil, sulfite saline oil or bittern environment in a wet state with specific salt type and concentration or below the underground water level. The concrete disclosed by the invention is applied to the sulfate bittern environment and can meet the requirements of concrete strength and durability of structures and components.

Description

Technical field [0001] The invention belongs to the field of civil engineering materials, and specifically relates to a corrosion-resistant concrete used in a sulphate brine environment and its production and construction process. Background technique [0002] The area of ​​my country's salt lake zone is about 250,000 square kilometers, mainly concentrated in the salt lake area of ​​Xinjiang, Tibet, Qinghai and Inner Mongolia. Among them, sulfate-type salt lakes are widely distributed, such as Dachaidan, Yiliping, Gaskule, Mangya, Beletan section of Chaerhan Salt Lake, Dongtai Naijier, Xitai Naijir and other salt lakes are sulfate-type, sulfuric acid Magnesium subtype salt lakes; most of the salt lakes in Xinjiang are sulfate-type salt lakes. The salt lake brine has a mineralization degree of 70-200g / L, up to 494g / L, and a specific gravity between 1.200-1.230. The saline soil area around the salt lake The salt content can be as high as 46.9%. Concrete is an indispensable part o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/30C04B111/20
Inventor 邵德志刘庆伟于浩黄新
Owner BEIHANG UNIV
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