Cement base rheological stabilizing agent and preparation method and application thereof

Abstract

The invention provides a cement base rheological stabilizing agent and a preparation method and application thereof.The stabilizing agent is prepared from the following components, by weight, of 70-90 parts of viscosity regulating agent A, 5-10 parts of viscosity regulating agent B, 1-5 parts of retarder, 10-25 parts of water reducing agent and 0-2 parts of anti-foaming agent.The stabilizing agent can be applied to dry-mixed mortar or concrete.The stabilizing agent can adjust the viscosity of a cement base system, has anti-sedimentation and bleeding-proof functions and can keep excellent compatibility with a polycarboxylate water reducing agent and improve the mixability of the cement base system at the plastic stage, the application property of the cement base rheological stabilizing agent is further improved, and the cement base rheological stabilizing agent can be widely applied to cement-based materials such as duct grouting materials (agents), grouting materials, cement mortar and concrete and is widely applied to the fields of highway bridges, railways, buildings and the like.

Description

technical field [0001] The invention relates to a rheological stabilizer specially used in cement-based systems and its preparation method and application. The stabilizer can adjust the viscosity of the cement-based system, play the role of anti-settling and anti-bleeding, and can be combined with polycarboxylate The acid water reducer maintains good compatibility, which can significantly improve the workability of the cement-based system in the plastic stage, thereby improving its workability. It can be widely used in grouting materials (agents), grouting materials, cement mortar, concrete Among cement-based materials such as cement, it has been widely used in road bridges, railways, construction and other fields. Background technique [0002] With the development of infrastructure, polycarboxylate high-efficiency water reducers have been vigorously developed in cement-based materials in recent years, but because of their high water-reducing rate, their dosage is low and th...

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Problems solved by technology

[0002] With the development of infrastructure, polycarboxylate high-efficiency water reducers have been vigorously developed in cement-based materials in recent years, but because of their high water-reducing rate, their dosage is low and their sensitivity to water is high. Sand and gravel aggregates are scarce, and machine-made sand has begun to be used on a large scale. In this case, concrete is very easy to bleed and segregate, and poor workability is difficult to solve. In response to this phenomenon, the industry has also developed Wenlun gum, xanthan gum, A series of materials such as cellulose ether are used to improve the workability of cement-based materials, but the following problems generally exist

1. In the fluid dry powder mortar, Wenlun gum and xanthan gum can improve the state of the slurry to a certain extent due to their high viscosity, but they are easy to affect the fluidity of the slurry in the dry powder mortar, so it leads to mixing The amount is very small, especially in the face of uneven dry powder mortar equipment, it is difficult for customers to use it well; and cellulose ether is divided into high viscosity and low viscosity, and high viscosity cellulose ether also has the same problem as Wenlun rubber. Due to the complex process of low-viscosity cellulose ether, there are very few enterprises that can produce it in China, and the price is expensive. In addition, cellulose ether has a retarding and air-entraining effect, so it is not used in fluid dry powder mortar as a whole. widely used

2. In concrete, due to the needs of engineering projects, it is usually compounded with liquid water reducing agent and sent to the site for use. However, the above-mentioned substances are still incompatible with polycarboxylic acid after being dissolved and diluted, which will cause polycarboxylic acid to reunite Therefore, in the concrete industry, especially in the case of poor sand and gravel materials, the situation of segregation and bleeding is very serious and cannot be effectively solved

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