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Thaumasite form sulfate attack (TSA) inhibitor, preparation method thereof and application thereof

A technology of tobermorite and inhibitor, which is applied in the field of building materials, can solve the problems of affecting the workability of cement-based materials, complex preparation process, numerous raw materials, etc., and achieves improved TSA damage resistance, simple process, and broad application prospects. Effect

Active Publication Date: 2013-06-05
CHINA BUILDING MATERIALS ACAD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The material can resist various types of sulphate erosion and damage (calcium vanadium type, gypsum type, calcium carbon sulfur silicate type), but the invention uses a large number of raw materials, the preparation process is complicated, and the transportation cost is relatively high
Research data have shown that adding barium salts to concrete can improve the TSA resistance of cement-based materials to a certain extent. Barium salts are directly mixed with stirring, but this improvement effect is only effective for a short period of time (about 6 months), and barium The introduction of salt can affect the workability of cement-based materials

Method used

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  • Thaumasite form sulfate attack (TSA) inhibitor, preparation method thereof and application thereof
  • Thaumasite form sulfate attack (TSA) inhibitor, preparation method thereof and application thereof
  • Thaumasite form sulfate attack (TSA) inhibitor, preparation method thereof and application thereof

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preparation example Construction

[0039] The present invention also provides a method for preparing the above-mentioned molarite-type sulfate corrosion inhibitor, the flow chart of the preparation method is as follows: figure 2 As shown, the following steps may be included:

[0040] 1) Weigh raw materials: 25-45 parts of barium salt, 15-25 parts of cement clinker, 20-40 parts of admixture, 15-30 parts of zeolite, 0.5-2.0 parts of powdered water reducer, 70-90 parts of water ;

[0041] 2) Wet grinding: Add barium salt, cement clinker, admixture, zeolite and water into the wet ball mill for mixing;

[0042] 3) drying: drying the wet mixed grinding slurry obtained in step 2) in an oven to constant weight;

[0043] 4) Dry grinding: add 98.0-99.5 parts of the wet mixed grinding slurry after drying in step 3) and 0.5-2.0 parts of powdered water reducer into the dry ball mill, and mix and grind until the Blaine specific surface area (350 ±10)m 2 / kg to obtain a molarite-type sulfate attack inhibitor.

[0044] I...

Embodiment 1-6

[0052] Embodiment 1-6, preparation of molarite type sulfate corrosion inhibitor

[0053] The preparation raw materials of the embodiment of the present invention 1-6 carbon sulfonotlite type sulfate corrosion inhibitor are as shown in table 1:

[0054] The raw materials for the preparation of table 1 embodiment 1-6 carbon sulfonotlite type sulfate erosion inhibitor

[0055]

[0056] Note: "Parts" refers to parts by weight, and the unit is kilogram or gram. The measurement basis can be set according to the actual scale, such as 1 part = 100 grams.

[0057] The preparation method of embodiment 1-6 molarite type sulfate erosion inhibitor comprises the following steps:

[0058] 1) Take the raw materials according to the formula shown in Table 1;

[0059] 2) Wet grinding: add barium salt, cement clinker, admixture, zeolite and water into a wet ball mill (model Φ1.2×2.4m) and mix and grind for (30±2) minutes;

[0060] 3) Drying: Dry the wet mixed grinding slurry obtained in st...

Embodiment 7

[0062] Embodiment 7, the detection of molarite type sulfate corrosion inhibitor

[0063] Detect the preventive TSA damage effect and action time of the carbon-sulfur wollastonite type sulfate erosion inhibitor of the present invention, the method is: to cement-limestone powder composite cementitious material (70 parts of cement+30 parts of limestone powder, water-cement ratio 0.40) Mix 2.0%~4.0% (mass percentage content) TSA inhibitor prepared by embodiment 1-6 respectively, take the cement-limestone powder composite cementitious material that mixes 1.5% (mass percentage content) barium hydroxide as Control, then placed at (5±2)°C, 5% MgSO 4 The solution was tested after 1 year respectively. The test items include the inspection of the appearance of the sample and the inspection of the MgSO 4 Determination of molarite content in solution (using XRD / Rietveld method). The results are shown in Table 2:

[0064] Table 2: Test results of cement-limestone powder composite cement...

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Abstract

The invention discloses a TSA inhibitor, a preparation method thereof and an application thereof. The TSA inhibitor comprises the following components, by weight, 25-45 parts of a barium salt, 15-25 parts of cement clinker, 20-40 parts of an admixture, 15-30 parts of zeolite, and 0.5-2.0 parts of a powdery water reducer. The TSA inhibitor has a multistage long-acting sustained-release characteristic to Ba<2+>, can durably improve the TSA destroy resistance of a cement-based material, and has a certain improvement effect on the workability, the strength, and the endurance of the cement-based material; and the preparation method of the invention has the advantages of simple technology of a used overlying packing technology, high efficiency, and strong adaptability. Experiments prove that the TSA inhibitor of the invention can substantially improve the TSA destroy resistance of the cement-based material, and can durably and effectively prevent the cement-based material from the TSA destroy.

Description

technical field [0001] The invention belongs to the Thaumasite form of sulfate attack (TSA) inhibitor in the field of building materials, in particular to a kind of inhibitor that can improve the TSA damage resistance of cement-based materials and prevent the TSA damage of cement-based materials. TSA inhibitors and methods for their preparation. Background technique [0002] At present, limestone has become an important raw material in my country's cement concrete industry. However, when there is sufficient sulfate, water and the temperature is suitable (generally considered <15°C), cement-based materials mixed with limestone powder or using limestone aggregates may suffer from Thaumasite form sulfate attack (Thaumasite form of sulfate attack, TSA) destruction. TSA is different from the traditional ettringite / gypsum-type sulfate attack. The formation of molarite directly destroys the C-S-H gel, the main gelling component in cement stone, and turns it into a mud-like sub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C04B24/22C04B24/26C04B24/00C04B103/61
Inventor 姚燕李长成王玲孙继成
Owner CHINA BUILDING MATERIALS ACAD
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