Retarding Water Reducing Cracking Agent

Abstract

The invention discloses a retarding water-reducing crack arresting agent. The retarding water-reducing crack arresting agent is prepared from the raw materials in parts by weight: 24-36 parts of sodium lignosulfonate, 14-26 parts of calcium propionate, 15-25 parts of bischofite powder, 48-54 parts of UNF-5 type efficient water-reducing agent, 35-45 parts of FDN-II type efficient water-reducing retarder, 10-15 parts of poly(methacrylate hyroxyehthyl ester), 10-15 parts of nano-carbon fiber, 7-11 parts of potassium dihydrogen phosphate, 4-8 parts of wormwood seed powder, 6-9 parts of sodium meta-aluminate, 10-15 parts of manganese slag, 3-6 parts of p-toluene sulfonic acid, 4-7 parts of benzotriazole, 4.5-6.5 parts of dithiodiglycolic acid, 2-4 parts of hydroxyethyl oil acid imidazoline betaine and 4-6 parts of promoter. The retarding water-reducing crack arresting agent has the characteristics of high shrinkage rate, strong crack resistance, strong toughness and strong freezing resistance, can be used for effectively reducing the shrinkage of concrete and preventing dry-shrinkage cracks, and also has the effect of efficient water reduction, and the water-reducing rate can be 15-25%. With the adoption of the retarding water-reducing crack arresting agent, the workability and the fluidity of fresh concrete are obviously improved, the bleeding and segregation phenomena do not occur after the concrete is mixed, the retarding effect is good, the slump loss is little, and the long-distance transportation is facilitated.

Description

technical field [0001] The invention relates to a retarding, water-reducing and crack-resisting agent, which belongs to the field of concrete admixtures. Background technique [0002] Concrete admixtures, referred to as admixtures for short, refer to substances that are added to improve the performance of concrete before or during the mixing of concrete. Because admixtures can effectively improve the performance of concrete and have good economic benefits, they have been widely used in many countries, and their application in engineering has attracted more and more attention, becoming an indispensable material in concrete. Among them, the retarding water reducing and cracking inhibitor is one of the concrete admixtures. The moderate expansion produced by the chemical reaction between it and the cement hydration product can compensate the shrinkage and cracking of the concrete, thereby improving the crack resistance of the concrete. Condensate the role of water. However, th...

AI Technical Summary

Problems solved by technology

However, the crack resistance of crack inhibitors currently used in the market still cannot meet the requirements of large-scale concrete projects such as highways, overpasses, and airport runways that require less expansion joints.

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