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Concrete anticorrosive rust inhibitor for cast-in-place piles

A concrete and rust inhibitor technology, applied in the field of concrete anticorrosion and rust inhibitors, can solve problems such as construction quality accidents and inconvenient measurement operations, and achieve the effects of prolonging service life, optimizing pore structure, and increasing compactness

Inactive Publication Date: 2018-06-19
HEBEI CONSTR & INVESTIGATION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large variety of admixtures and compatibility problems among different admixtures, if the method of adding them separately is adopted in the concrete mixing station, not only the measurement operation is inconvenient, but also it is easy to cause construction quality accidents

Method used

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  • Concrete anticorrosive rust inhibitor for cast-in-place piles
  • Concrete anticorrosive rust inhibitor for cast-in-place piles
  • Concrete anticorrosive rust inhibitor for cast-in-place piles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Prepare concrete anticorrosion and rust inhibitor according to the following ratio, accurately weigh it, put it into a mixer and stir evenly, and control the mixing time for 20 minutes.

[0021] Its composition is: 20% of calcium nitrite, 30% of silica fume, 40% of Class I fly ash of F class, 8% of ground and expanded clinker (the main component is calcium oxide, calcined at high temperature, cooled to room temperature, and ground to Specified fineness, its specific surface area is greater than 300m 2 / kg, less than 400m 2 / kg), powder plasticizer (solid polycarboxylic acid) 1.5%, rosin air-entraining agent (triterpene saponin) 0.5%. Among them, the specific surface area of ​​silica fume is 650m 2 / kg, the specific surface area of ​​the particles after mixing all the materials is 420m 2 / kg. According to the provisions of JC / T1011-2006 "Concrete Sulfate Corrosion Resistance Anticorrosion Agent", the dosage is 10% by mass of cement (internal mixing method). Its physi...

Embodiment 2

[0028] Prepare the concrete anticorrosion and rust inhibitor according to the following proportions. After the components are accurately weighed, put them into the mixer and mix them evenly. The mixing time is controlled to be 20 minutes.

[0029] Composition: 30% calcium nitrite, 30% silica fume, 30% primary fly ash, 9% ground expanded clinker, 0.5% powder plasticizer, and 0.5% air-entraining agent. Among them, the specific surface area of ​​silica fume is 650m 2 / kg, the type of each component chemical material in the composition is the same as that of Example 1. After mixing all the materials, the specific surface area of ​​the particles is 430m 2 / kg.

[0030] According to the provisions of JC / T 1011-2006 "Concrete Sulfate Corrosion Resistance Anticorrosion Agent", the dosage is 10% by mass of cement (internal mixing method). Its physical and chemical properties are shown in Table 3, and all indicators meet the requirements. .

[0031] Table 3 Requirements for physical...

Embodiment 3

[0037] Prepare the concrete anti-corrosion and rust inhibitor according to the following ratio, accurately weigh it, put it into the mixer and mix it evenly, and control the mixing time for 20 minutes.

[0038] Calcium nitrite 25%, silica fume 25%, primary fly ash 40%, ground expanded clinker 9%, powder plasticizer 0.2%, air-entraining agent 0.8%. Among them, the specific surface area of ​​silica fume is 650m 2 / kg, the type of each component chemical material in the composition is the same as that of Example 1. The specific surface area of ​​the mixture particles is 410m 2 / kg.

[0039] According to the provisions of JC / T 1011-2006 "Concrete Sulfate Corrosion Resistance Anticorrosion Agent", the dosage is 10% by mass of cement (internal mixing method). Its physical and chemical properties are shown in Table 5, and all indicators meet the requirements .

[0040] Table 5 Requirements for physical and chemical properties of anti-sulfate corrosion inhibitors

[0041]

[0...

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Abstract

The invention discloses a concrete anticorrosive rust inhibitor for cast-in-place piles. The concrete anticorrosive rust inhibitor is formed by mixing and stirring the following components by mass: 20-30% of calcium nitrite, 20-30% of silica fume, 30-40% of fly ash, 8-10% of finely ground expansive clinker, 1-1.5% of a powder plasticizer and 0.2-0.8% of an air entraining agent. The concrete anticorrosive rust inhibitor has no significant effect on working performance of concrete under appropriate dosage, improves age strength of the concrete, increases compactness of the concrete by certain self-expansion, forms a dense protective layer on a surface of a reinforcing bar, and effectively improves sulfate corrosion resistance of the concrete and erosion resistance of the reinforcing bar.

Description

technical field [0001] The invention relates to a concrete anticorrosion and rust inhibitor, in particular to an anticorrosion agent for cast-in-situ piles that can effectively resist concrete corrosion and steel bar corrosion, and belongs to the technical field of building materials. Background technique [0002] Sulfate attack has become an important factor affecting the durability of concrete structures. In recent years, in highway, railway, mine construction, underground civil air defense project, bridge foundation, tunnel lining, subway tunnel segment, hydropower project, such as Liujiaxia Hydropower Station, Bapanxia Hydropower Station in the middle and upper reaches of the Yellow River, Qinghai Chaoyang Hydropower Station and some electric power irrigation projects Severe sulphate attack has been found in concrete projects such as cement, seaports and airports. Due to the deterioration of material properties, the structure was withdrawn from service before reaching t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/08C04B103/61
CPCC04B40/0039C04B2103/61C04B22/085C04B18/146C04B18/08C04B22/064C04B2103/30C04B2103/304
Inventor 吴立春王俊高哲
Owner HEBEI CONSTR & INVESTIGATION RES INST
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