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Composite retarder for concrete

A composite retarder and concrete technology, which is applied in the field of concrete retarders, can solve the problems of inhibiting the application range and the limited performance of a single retarder

Inactive Publication Date: 2018-09-04
芜湖恒固混凝土材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although both inorganic retarders and organic retarders have a certain retarding effect, the performance of a single retarder is still very limited, which limits its application range to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The present invention also provides a kind of preparation method of composite retarder for concrete, comprising the following steps:

[0021] (1) After uniformly ball-milling bentonite, gypsum and hydroxyethylidene diphosphonic acid in a ball mill, then add water, and then stir and react at 80-95°C for 12-24 hours to obtain modified gypsum;

[0022] (2) After mixing polyether polyol, acid anhydride with 4-8 carbon atoms and organic amine in water, react at 80-120°C for 2-4 hours to obtain polymer emulsion A, and add phosphoric acid to polymer emulsion A Salt retarder, catalyst and formaldehyde are reacted at 80-120°C for 1-4 hours to obtain a retarder intermediate;

[0023] (3) After adding polymer, sodium borate, calcium sulfate, water reducer, dispersant, surfactant, modified gypsum to the retarder intermediate and mixing evenly, adjust the concentration of the product obtained to be 20% to 30%; pH When the value is 3.0-6.0, the composite retarder for concrete is obt...

Embodiment 1

[0028] A composite retarder for concrete, made of the following raw materials in parts by weight: 30kg polyvinylpyrrolidone K60, 10kg sodium dipolyphosphate, 2kg hydroxyethylidene diphosphonic acid, 5kg bentonite, 2kg gypsum, 4kg ethylenediaminetetra Disodium acetate, 3kg polyether 3050, 6kg maleic anhydride, 3kg ethylenediamine, 3kg hydrochloric acid (32wt%), 1kg formaldehyde, 3kg sodium borate, 6kg calcium sulfate, 5kg polycarboxylate water reducer (model PASP-Ca, Purchased from Shandong Yuanlian Chemical Co., Ltd.), 2kg sodium lignosulfonate, 0.8kg silicone surfactant (purchased from Hangzhou Pinying New Material Co., Ltd., PY402).

[0029] The preparation steps of the composite retarder for the concrete are as follows:

[0030] (1) After uniformly grinding bentonite, gypsum and hydroxyethylidene diphosphonic acid in a ball mill, then adding water, and then stirring and reacting at 95°C for 24 hours to obtain modified gypsum;

[0031] (2) After mixing polyether 3050, malei...

Embodiment 2

[0034]A composite retarder for concrete, made of the following raw materials in parts by weight: 35kgPEG400, 8kg dibutyl phosphate, 4kg hydroxyethylidene diphosphonic acid, 10kg bentonite, 5kg gypsum, 5kg edetate disodium, 5kg polyether 3050, 8kg maleic anhydride, 6kg pentaethylene hexamine, 3kg hydrochloric acid (32wt%), 2kg formaldehyde, 4kg sodium borate, 8kg calcium sulfate, 6kg polycarboxylate water reducer (model PASP-Ca, purchased from Shandong Yuanlian Chemical Co., Ltd.), 3kg sodium lignosulfonate, 0.5kg silicone surfactant (purchased from Hangzhou Pinying New Material Co., Ltd., PY402).

[0035] The preparation steps of the composite retarder for the concrete are as follows:

[0036] (1) After uniformly grinding bentonite, gypsum and hydroxyethylidene diphosphonic acid in a ball mill, add water, and then stir and react at 80°C for 12 hours to obtain modified gypsum;

[0037] (2) After mixing polyether 3050, maleic anhydride and pentaethylene hexamine in water, react...

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PUM

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Abstract

The invention relates to the technical field of retarders for concrete, in particular to a composite retarder for concrete. The retarder is prepared from, by weight, 20-45 parts of polymers, 5-12 parts of phosphate retarder, 1-4 parts of diphosphonic acid, 3-12 parts of bentonite, 2-8 parts of gypsum, 3-5 parts of disodium edetate dihydrate, 2-8 parts of polyether polyol, 5-10 parts of anhydride with the carbon atom number of 4-8, 3-8 parts of organic amine, 1-5 parts of catalyst, 1-3 parts of formaldehyde, 2-4 parts of sodium borate, 4-8 parts of calcium sulfate, 4-6 parts of water reducing agent, 1-3 parts of dispersing agent and 0.4-0.8 part of surfactant. According to the composite retarder for the concrete, cement can be wrapped and prevented from being coagulated too early, the lossrate of cement strength is lowered, and the coagulation speed of the concrete is lowered.

Description

technical field [0001] The invention relates to the technical field of concrete retarders, in particular to a composite retarder for concrete. Background technique [0002] With the continuous development of construction technology, concrete with various special requirements emerges as the times require. In some large-scale concrete projects, in order to ensure that the bored piles in the subsequent construction and the bored piles completed in the previous construction are interlocked into a whole, it is often required to extend the setting time of the concrete to 60-80 hours, but it cannot affect the concrete. ultimate strength. Obviously, ordinary retarders cannot meet this requirement. The market share of this kind of ultra-retarding concrete is gradually increasing. In today's shrinking civil construction market, research on concrete super-retarding agents has very realistic economic and technical values. [0003] At present, the retarders on the market can be divide...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B103/22
CPCC04B40/0039C04B2103/22C04B24/2652C04B22/16C04B24/003C04B14/104C04B22/143C04B24/12C04B24/32C04B24/04C04B24/121C04B24/008C04B22/122C04B22/08C04B24/18C04B24/42C04B2103/302
Inventor 承忠富
Owner 芜湖恒固混凝土材料有限公司
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