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

A technology of concrete water reducing agent and polycarboxylate, which is applied in the field of concrete admixtures, can solve the problems of poor setting retardation effect and limited concrete setting time, and achieves the effects of delaying setting time and improving fluidity loss.

Active Publication Date: 2010-01-06
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Add 250kg of tap water in the 1000L reactor, drop into aminotrimethylene phosphonic acid (A-1) 150kg successively, 2-phosphonic acid butane-1,2,4-tricarboxylic acid pentasodium salt (A-5) 100kg, stir Evenly, at the same time open the reactor jacket to circulate the cooling water, add dropwise 300kg of 30% sodium hydroxide solution within 30min, the pH value of the solution is 6.2, then add 120kg of sucrose (B-1) and 75kg of sorbitol (C-1) in turn , C 8-10 Alkyl glucoside (APG-2) 15kg, stirred until it dissolves into a uniform solution with a solid content of 48.5% and a pH value of 6.3.

Embodiment 2

[0051] Add tap water 460kg in 1000L reactor, drop into aminotrimethylene phosphonic acid hexasodium salt (A-3) 285kg successively, stir well, then add glucose (B-2) 140kg successively, sorbitol (C-1) 95kg, C 12-14 Alkyl glucoside (APG-1) 20kg, stirred until it dissolves into a uniform solution with a solid content of 54.0% and a pH value of 6.7.

Embodiment 3-4

[0053] The types and proportions of raw materials used in Examples 3-4 are shown in Table 3. The preparation process is the same as in Example 1, except that the amount of alkali used to adjust the pH value of the solution is different, and the final pH value is 6-8.

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PUM

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Abstract

The invention relates to a high temperature retarder suitable for a polycarboxylate concrete water reducing agent and a preparation method thereof. The high temperature retarder consists of the following components with the weight portions of 20-30 percent of water soluble organic phosphonic acid or salts thereof, 10-15 percent of carbohydrate retarding component, 5-10 percent of polyols retarding component and 1-2 percent of alkyl glycoside nonionic surfactant, and the rest is water. The preparation steps are: firstly, adding water in a reaction vessel, then puting the organic phosphonic acid or salts thereof in the vessel, and stirring evenly; secondly, starting a jacket of the reaction vessel to cycle cooling water, adding alkaline solution in drops in the reaction vessel during the stirring to regulate the pH value to be 6-8; thirdly, adding nonionic carbohydrate compound, polyols retarding component and alkyl glycoside nonionic surfactant in the reaction vessel, and stirring evenly to obtain the retarder. When the invention is used together with existing polycarboxylate concrete additive, the concrete setting time can be delayed according to the project requirement and the fluidity loss of the freshly mixed concrete can be improved even under the 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B24/02C04B103/22
CPCC04B28/02C04B2103/46C04B40/0039
Inventor 缪昌文冉千平沙建芳游有鲲刘加平洪锦祥
Owner JIANGSU SOBUTE NEW MATERIALS