Corrosion-resistant concrete for salty environment, and manufacturing method and construction technique thereof

A technology of corrosion-resistant concrete and construction technology, applied in the direction of cement production, etc., to achieve the effect of easy operation and simple construction process

Inactive Publication Date: 2014-03-12
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 saline environment, the invention provides a kind of corrosion-resistant concrete used in saline environment and its production method and construction technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A chemical brine pool covering an area of ​​about 30,000m2 was built in a salt lake area. According to the engineering survey report, it was known that the salt content of the saline soil in this area was 26.8%, and the main ion content was: Ca 2+ : 1.2%, Mg 2+ : 2.8%, K + / Na + : 9.5%, SO 4 2- : 2.7%, Cl - : 10.3%, HCO 3 - / CO 3 2- : 0.1%. The salinity of the brine to be stored in the brine pool is 360g / L, and the salinity of the main ions is (g / L): K + / Na + : 131.35, Ca 2+ : 24.32, Mg 2+ : 45.02, Cl - : 206.43, SO 4 2- : 23.68, HCO 3 - / CO 3 2- : 0.12. According to the type and salt content of the saline soil and the salinity of the brine to be stored in the brine pool, the corrosion-resistant concrete is prepared in parts by weight of the following raw materials:

[0025] Slag: 700 parts; activated magnesium oxide powder: 300 parts; lime: 200 parts; mineral admixture: 350 parts; coarse aggregate: 1500 parts; fine aggregate: 850 parts; water: 400...

Embodiment 2

[0028] Plain concrete cast-in-situ piles are used for the foundation treatment of a factory building in a saline soil area. The designed pile length is 12m, pile diameter is 500cm, and the groundwater depth is 4m. According to the engineering investigation report, it is known that the salt content of the saline soil area is 5.2%, and the main ion content is: Ca 2+ : 0.7%, Mg 2+ : 0.5%, K + / Na + : 1.1%, SO 4 2- : 2.1%, Cl - : 0.6%, HCO 3 - / CO 3 2- : 0.2%. The salinity of underground brine is 63.7g / L. According to the type and salt content of saline soil and the salinity of underground brine, the corrosion-resistant concrete is prepared according to the weight of the following raw materials:

[0029] Slag: 500 parts; activated magnesium oxide powder: 120 parts; mineral admixture: 150 parts; coarse aggregate: 1200 parts; fine aggregate: 700 parts; water: 300 parts. Among them, the specific surface area of ​​slag is 300m2 / kg; the specific surface area of ​​activated ...

Embodiment 3

[0032] A seaport is protected against tides and waves, and is constructed by pouring reinforced concrete dams on site. The dams are immersed in seawater at a depth of 6-8m all year round. According to the test report of seawater, the salinity of seawater here is 31.88g / L, and the main ion The salinity is (g / L): K + and Na + : 15.32, Ca 2+ : 0.41, Mg 2+ : 0.33, Cl - : 12.67, SO 4 2- : 0.81, CO 3 2- : 0.13. According to the salinity of the above-mentioned main ions in seawater, the corrosion-resistant concrete is prepared according to the parts by weight of the following raw materials:

[0033] Slag: 650 parts; activated magnesium oxide powder: 180 parts; lime: 150 parts; mineral admixture: 50 parts; coarse aggregate: 750 parts; fine aggregate: 600 parts; water: 120 parts. Among them, the specific surface area of ​​slag is 350m 2 / kg; active magnesium oxide specific surface area is 300m 2 / kg; lime is quicklime, specific surface area is 200m 2 / kg; the mineral admixt...

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Abstract

The invention discloses a corrosion-resistant concrete for salty environment, and a manufacturing method and construction technique thereof. The salty environment is salty soil of which the salt content is 1-30 wt% and the water content is 20-150 wt%, or a brine environment of which the salinity is 10-500 g/L. The concrete is prepared from slag, light-calcined magnesium oxide, lime, water, aggregate and mineral admixture. Under the interactions among the components of the concrete and between the concrete and salts in the salty environment, the method ensures the concrete to solidify, harden, produce and develop in the salty environment and to maintain the strength for a long time. The concrete can satisfy the requirements of constructions and components for strength and durability when being used in various salty environments, including salty soil and brine.

Description

(1) Technical field: [0001] The invention belongs to the field of civil engineering materials, in particular to a corrosion-resistant concrete used in a saline environment, a manufacturing method and a construction process thereof. (2) Background technology: [0002] There are large areas of saline soil distributed in our country, especially the saline soil in the western salt lake area and the eastern coastal area has high salt content and many types of salt. To build structures in these areas, it is necessary to consider the resistance of the structures and components to the saline environment. corrosion performance. The saline environment mainly includes all kinds of saline soil and brine environment in a humid state or below the groundwater table, and the salt contained in it is mainly potassium (K + ), sodium (Na + ), magnesium (M g 2+ ), calcium (Ca 2+ ) chloride salt (Cl - ), sulfate (SO 4 2- ) and carbonate (CO 3 2- ), which have a severe corrosive effect o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10C04B7/14C04B111/20
CPCY02P40/10
Inventor 程寅黄新
Owner BEIHANG UNIV
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