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Method for improving concrete cement paste chlorine ion combination long residual action

A cement slurry and chloride ion technology, applied in the field of building materials, can solve problems such as chloride ion dissolution, and achieve the effects of alleviating the corrosion problem, broadening the application, and increasing the fixed amount

Inactive Publication Date: 2019-03-01
BEIJING UNIV OF TECH
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Problems solved by technology

[0005] Aiming at the currently researched chloride ion binding properties are all aluminum-rich mineral admixtures, the purpose of the present invention is to overcome the problems of F salt decomposition and chloride ion dissolution in clean slurry, mortar and concrete over a long period of time, and to explore more stable iron quality F salt, providing a long-term fixation method for chloride ions

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  • Method for improving concrete cement paste chlorine ion combination long residual action
  • Method for improving concrete cement paste chlorine ion combination long residual action
  • Method for improving concrete cement paste chlorine ion combination long residual action

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the examples, but the present invention is not limited to the following examples.

[0013] ⑴ Ferric hydroxide, silica fume and cement are used as raw materials, and one of triethanolamine and triisopropanolamine is used as an auxiliary raw material. The mass percentage of each composition is as follows: iron hydroxide 5%-10%, silica fume 2%-5 %, the balance is cement dry matter, triethanolamine accounts for 0.01%-0.1% of the total mass of the above three, and triisopropanolamine accounts for 0.0025%-0.1% of the total mass of the above three;

[0014] ⑵Add various raw materials to the slurry mixing pot in the above ratio and stir, and add 0.25mol / L CaCl at a water-cement ratio of 0.4 2 Solution; after stirring and mixing evenly under the stirring of the pure pulp mixer, pour the liquid pure pulp slurry into a 200mL plastic bottle, and smear the bottle mouth interface with vaseline, and maintain it ...

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Abstract

The invention discloses a method for improving concrete cement paste chlorine ion combination long residual action, and belongs to the technical field of building materials. The method comprises the following steps: adding ferric hydroxide and silicon ash to cement paste, and doping triethanolamine or triisopropanolamine, wherein a total mass of a cement drier, the ferric hydroxide and the siliconash is 100%, wherein the ferric hydroxide is 5%-10%, the silicon ash is 2%-5%, the triethanolamine accounts for 0.01%-0.1% of a total mass of the above three parties, and the triisopropanolamine accounts for 0.0025%-0.1% of the total mass of the above three parties. The method is capable of improving chlorine ion fixation capacity of cement concrete, widening an application of the triethanolamineand the triisopropanolamine in the cement concrete, and relieving a corrosion problem of a reinforcing steel bar because of the action of chlorine ions in seawater.

Description

technical field [0001] The invention relates to a method for improving the long-term effect of chloride ion binding of concrete cement slurry, which belongs to the technical field of building materials. technical background [0002] The corrosion of steel bars in reinforced concrete caused by chloride ions is the main reason affecting the durability of concrete. Tricalcium aluminate in cement (C 3 A) react with chloride ions to generate calcium chloroaluminate hydrate (C 3 A·CaCl 2 10H 2 O), also known as Friedel's salt, the mineral admixture with more aluminum content has an obvious binding effect on chloride ions [Rasheeduzzafar, Hussain S E, Al-Saadoun S S.Effect of tricalcium aluminum content of cement on chloridebinding and corrosion of reinforcing steel in concrete [J]. Aci Materials Journal, 1992, 89(1): 3-12.]. Fly ash and metakaolin are Al 2 o 3 Mineral admixtures with higher content can effectively increase the immobilization of chloride ions in the early st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/00C04B2111/20C04B22/06C04B18/146C04B24/122
Inventor 严建华宋娅琪崔延帅崔素萍郝挺宇罗占勇
Owner BEIJING UNIV OF TECH
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