What small ingredients should be added to the admixture to resist mud?

This new type of concrete mud inhibitor is popular in the market. This product should be a small molecular carbon molecular sieve, which can be adsorbed on the surface of clay particles first, neutralize the charge of the clay, and reduce the adsorption of the polycarboxylate superplasticizer by the clay. This product is harmless, non-flammable, has no rusting effect on steel bars, and can be used in concrete for various pumping and decoration projects such as house construction, roads, bridges, hydraulic engineering and foundation pit projects. This product can effectively reduce the adsorption of water-reducing agent by mud and lime powder, and improve the fluidity and expansion of concrete. And reduce the slump damage of concrete over time. It was developed by Tianjin Dingchang New Materials Company. You can ask them for the secret recipe.

What he is talking about should be mud inhibitors. Mud inhibitors reduce the harm of mud content to concrete and improve workability and performance. As far as I know, there is currently no effective mud-blocking agent, either it is insufficient for the tertiary industry, or it is not very effective.

1. Raw materials

(1) Concrete: P·O 42.9 grade concrete, Yizheng Gaote Chemical Plant; Sand: my country’s ISO standard sand, Fuzhou Ai Siou Standard Sand Co., Ltd. Company; mud: bentonite, chemically pure, Sinopharm Chemicals; polycarboxylate superplasticizer mother liquor, 40% solid content, developed by the Research Center of Oak Biology Nantong Co., Ltd.

(2) Methallyl polyoxyethylene ether (OXAC-608): for industrial use, Guangzhou Oak Biology Co., Ltd.; Oxyethyltrimethylammonium methacrylate: 75% saturated solution, Aladdin's reagent; ammonium persulfate: analytical grade, Sinopharm Chemicals; mercaptopropionic acid: analytical grade, Sinopharm Chemicals; acrylic acid in acetyl: chemical purity, Sinopharm Chemicals; ascorbic acid :Chemically pure, Sinopharm chemicals; deionized water.

2. Preparation method

Add the polyether model and sufficient deionized water to a four-necked flask and mix. The model, initiator, and chain transfer agent are added dropwise. Method: add dropwise for 3-5 hours at a temperature of 60-80°C, then the reaction is completed, and then keep warm for 1-2 hours to obtain polyether anti-mud water-reducing agent equipment (KN).

3. Experimental method

The fluidity of concrete mortar was measured in accordance with GB/T 19671-1999 "Concrete mortar strength test method", and bentonite was added to simulate the presence of mud. For mortar machines with a large amount of mortar, polycarboxylate water-reducing agent and polyether anti-mud agent are added together to compare the fluidity.

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