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High-efficiency sulfate-resistant concrete additive and preparation method thereof

An anti-sulfate and additive technology, applied in the field of building materials, can solve the problem of not being able to inhibit the erosion of tobermorite type sulfate, unable to inhibit the tobermorite from a microscopic perspective, and the improvement effect and validity period still need to be tested, etc. problems, to achieve the effect of improving the resistance to sulfate corrosion, improving the degree of compaction, and improving the working performance

Active Publication Date: 2018-01-30
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above method cannot inhibit the formation of ettringite (expansion source) from a chemical point of view, and does not contain the function of controlling the shrinkage of concrete, and cannot inhibit the erosion of ettringite-type sulfate
[0007] As long as the formation conditions are met, the molybdenite-type sulfate attack will slowly react, and this type of corrosion additive needs to inhibit the formation of its crystals from the chemical level, such as the patent "a molybdenite-type sulfate corrosion inhibiting The molarite-type sulfate corrosion inhibitor published in "Agents and Preparation Methods and Applications": This patent is mainly designed for the special form of erosion damage of molarite, and the inhibition mechanism is to reduce the corrosion from both physical and chemical aspects. The hazards of sulfate ions, but it cannot inhibit the formation of molarite crystals from the microscopic point of view, and it cannot control the cracks caused by the shrinkage of the concrete itself, so its improvement effect and validity period still need to be tested

Method used

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  • High-efficiency sulfate-resistant concrete additive and preparation method thereof
  • High-efficiency sulfate-resistant concrete additive and preparation method thereof
  • High-efficiency sulfate-resistant concrete additive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The raw materials are 15 parts by weight of barium salt, 5 parts of sorbitol, 30 parts of calcined diatomite, 0.5 parts of grinding aid, 30 parts of silica fume, 18 parts of superfine fly ash, and 1.5 parts of water reducer.

[0038] The preparation method comprises the following steps:

[0039] (1) Pretreatment of diatomite: crush the diatomite into particles with an average particle size of 3-6 mm, calcinate at 650-750° C. for 2 hours, rapidly cool to room temperature, and set aside.

[0040] (2) Preparation of barium salt: mix barium hydroxide and barium carbonate according to the mass ratio of 3:1, and set aside.

[0041] (3) Weigh barium salt, grinding aid, sorbitol, calcined diatomite in step 1, and 40 parts of water according to the above ratio and place them in a vertical wet cell grinder for grinding until the specific surface area is 400-600m 2 / Kg.

[0042] (4) Dry the slurry obtained in step 3 in a dryer (at a temperature of 105° C.) for later use.

[004...

Embodiment 2

[0048] The raw materials are 25 parts by weight of barium salt, 8 parts of sorbitol, 22 parts of calcined diatomite, 1.0 part of grinding aid, 30 parts of silica fume, 12 parts of superfine fly ash, and 2.0 parts of water reducer.

[0049] The preparation method comprises the following steps:

[0050] (1) Pretreatment of diatomite: crush the diatomite into particles with an average particle size of 3-6 mm, calcinate at 650-750° C. for 2 hours, rapidly cool to room temperature, and set aside.

[0051] (2) Preparation of barium salt: mix barium hydroxide and barium carbonate at a mass ratio of 3:1.5, and set aside.

[0052] (3) Weigh barium salt, grinding aid, sorbitol, calcined diatomite in step 1, and 50 parts of water according to the above ratio and place them in a vertical wet cell grinder for grinding until the specific surface area is 400-600m 2 / Kg.

[0053] (4) Dry the slurry obtained in step 3 in a dryer (at a temperature of 105° C.) for later use.

[0054] (5) Weig...

Embodiment 3

[0059] In parts by weight, it is 18 parts of barium salt, 5 parts of sorbitol, 15 parts of calcined diatomite, 1.0 part of grinding aid, 50 parts of silica fume, 10 parts of superfine fly ash, and 1.0 part of water reducer.

[0060] Follow the steps below to experiment:

[0061] (1) Pretreatment of diatomite: crush the diatomite into particles with an average particle size of 3-6 mm, calcinate at 650-750° C. for 2 hours, rapidly cool to room temperature, and set aside.

[0062] (2) Preparation of barium salt: mix barium hydroxide and barium carbonate at a mass ratio of 3:1.2, and set aside.

[0063] (3) Weigh barium salt, grinding aid, sorbitol, calcined diatomite in step 1, and 45 parts of water according to the above ratio and place them in a vertical wet cell grinder for grinding until the specific surface area is 400-600m 2 / Kg.

[0064] (4) Dry the slurry obtained in step 3 in a dryer (at a temperature of 105° C.) for later use.

[0065] (5) Weigh silica fume, superfin...

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Abstract

The invention discloses a high efficiency sulfate attack resistant concrete additive and a preparation method thereof. The technical scheme of the concrete additive comprises the following raw materials in parts by weight: 15-25 parts of barium salt, 5-10 parts of sorbitol, 15-30 parts of calcined diatomaceous earth, 0.5-1.0 part of a grinding aid, 30-50 parts of silica fume, 10-20 parts of ultrafine fly ash and 1.0-2.0 parts of a water reducer. The high efficiency sulfate attack resistant concrete additive can reduce the proper shrinkage cracks of concrete, improve the compactness, and greatly improve the multi-type attack resistant properties of the concrete effectively for a long time.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a high-efficiency sulfate corrosion-resistant concrete additive and a preparation method thereof. Background technique [0002] Our country has a vast territory, and the geological and climatic conditions are varied. The concentration of sulfate radicals in the soil and water quality of various regions also varies from hundreds to tens of thousands of ppm. At present, my country is in the period of developing the west, revitalizing the Northeast and implementing the major strategic planning of the "Belt and Road". A large number of infrastructure construction and some major cross-regional and trans-international projects have been launched one after another, such as the West-East Gas Transmission and West-East Electricity Transmission, etc. And the completed Qinghai-Tibet Railway. However, in my country's geological and climatic environment, concrete is prone to a series of sulf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24C04B24/12C04B103/61
CPCC04B40/0039C04B2103/61C04B22/064C04B22/10C04B24/023C04B14/08C04B2103/52C04B18/146C04B18/08C04B2103/302
Inventor 王迎斌贺行洋苏英郑正旗王庭苇叶青代飞孙艺恒兰蒙
Owner HUBEI UNIV OF TECH
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