High-temperature retarders suitable for polycarboxylate concrete dehydragent and method for making same

Abstract

The invention relates to a high-temperature retarder compatible with a polycarboxylate concrete water-reducer and a preparation method thereof. The high-temperature retarder is formulated by weight percentage from the following components: water-soluble organic phosphonic acid or its 20-30% of salt, 10-15% of carbohydrate retarding component, 5-10% of polyalcohol retarding component, 1-2% of alkyl glycoside non-ionic surfactant, and the balance is water. The preparation steps are as follows: 1) firstly add water into the reaction kettle, then put in organic phosphonic acid or its salt, and stir evenly; 2) open the jacket of the reaction kettle to circulate cooling water, and dropwise add alkali solution into the reaction kettle while stirring, Adjusting the pH value to 6-8; 3) Adding non-ionic sugar compounds, polyalcohol retarding components and alkyl glycoside non-ionic surfactants into the reaction kettle, stirring evenly to obtain the product. When the present invention is used in combination with the existing polycarboxylate concrete admixture, it can not only delay the setting time of concrete according to engineering needs, but also improve the fluidity loss of freshly mixed concrete even in high temperature environment in summer.

Description

technical field [0001] The present invention relates to the retardation problem of concrete mixed with polycarboxylate admixture in high temperature environment in summer, and specifically relates to a high-temperature retarder compatible with polycarboxylate concrete water reducing agent and its preparation method, which belongs to concrete Admixture technical field. Background technique [0002] Concrete is a very widely used structural material in civil engineering, construction, water conservancy, nuclear power and many construction projects, and mass concrete has gradually become an important part of the main body of large facilities or structures. A large amount of hydration heat is generated to increase the internal temperature of the concrete, forming a temperature difference between the inside and outside, resulting in temperature cracks in the concrete, thereby reducing the durability of the concrete structure and endangering the safe use of the building. Concrete...

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Problems solved by technology

However, this retarding component delays the setting time of concrete to a limited extent, and the retarding effect is even worse in high temperature environments.

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