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Polycarboxylic retarding high-performance water reducing agent for preparing concrete of middle and low strength grade

A high-efficiency water reducer and polycarboxylic acid-based technology, applied in the field of chemical building materials and construction, can solve the problems of high air content in fresh concrete, difficulty in controlling low dosage, and restrictions on popularization and application, and achieve low shrinkage ratio and high adaptability Good, the effect of improving the overall performance

Inactive Publication Date: 2009-11-18
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of polycarboxylic acid products is relatively expensive, the compatibility with other admixtures is poor, the dosage is too low to control, the air content of fresh concrete is too large, and the compressive strength is low, which greatly limits the use of polycarboxylate-based water reducers. Popularization and Application of Commercial Concrete of Medium and Low Strength Grades (C15~C40)

Method used

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  • Polycarboxylic retarding high-performance water reducing agent for preparing concrete of middle and low strength grade
  • Polycarboxylic retarding high-performance water reducing agent for preparing concrete of middle and low strength grade
  • Polycarboxylic retarding high-performance water reducing agent for preparing concrete of middle and low strength grade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 4415kg of water into the 5000L reactor, and then put in 500kg of low air-entraining polycarboxylate mother liquor, 85kg of retarder, 0.6kg of fatty alcohol polyoxyethylene ether sodium sulfate, 1.8kg of air-entraining agent, hydroxyethyl methylcellulose 1.0 kg of plain ether, 0.5 kg of hydroxypropyl distarch phosphate, and 3 kg of hexamethylenediamine tetramethylene phosphonic acid potassium salt were stirred until they were dissolved into a uniform solution (about 20 min), with a mass concentration of 7.01%.

Embodiment 2

[0033] Add 4300kg of water into the 5000L reactor, and then put in 600kg of low air-entraining polycarboxylate mother liquor, 100kg of retarder, 0.6kg of α-alkenyl sulfonate (AOS), 1.6kg of air-entraining agent, carboxymethyl fiber 0.8 kg of plain sodium, 0.4 kg of phosphorylated distarch phosphate, and 5 kg of potassium aminotrimethylene phosphonate were stirred until they were dissolved into a uniform solution (about 20 minutes), with a mass concentration of 8.38%.

Embodiment 3

[0035] Add 4150kg of water into the 5000L reactor, and then put in 750kg of low air-entraining polycarboxylate mother liquor, 100kg of retarder, 1kg of fatty alcohol polyoxyethylene ether sodium sulfate, 2kg of air-entraining agent, hydroxypropyl methyl cellulose ether 1.4kg, 0.7kg of phosphorylated distarch phosphate, 4kg of hexamethylenediamine tetramethylene phosphonic acid potassium salt, stir until they dissolve into a homogeneous solution (about 20min), with a mass concentration of 10.18%.

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Abstract

The invention discloses a polycarboxylic retarding high-performance water reducing agent used for preparing concrete of middle and low strength grade. According to the weight percentage of the effective solid content, the water reducing agent comprises 9-15% of low air-entrained mother liquor, 0.5-3.0% of retarder, 0.01-0.03% of foam stabilizer, 0.03-0.10% of air-entraining agent, 0.02-0.08% of thickener, 0.05-0.20% of activator and the balance of water. The preparation method comprises the following steps of: weighing all compositions by the weight percentage of each effective solid content, putting and slowly mixing the compositions in a reaction kettle for 10-30min, thus obtaining the concrete. By adjusting the proportion of all compositions, the polycarboxylic retarding high-performance water reducing agent can meet the usage requirements of the concrete of middle and low strength grade (C15-C40), has the advantages of wide doping range, high water reducing ratio, good retarding effect, low chlorine and alkali content, low concrete shrinkage ratio, greenness, environmental protection and the like, and can prepare the green and economic high-performance concrete.

Description

technical field [0001] The invention belongs to the field of chemical building materials and construction, and in particular relates to a polycarboxylate-based slow-setting high-efficiency water reducer for preparing medium and low-strength concrete. Creep concrete, self-compacting and vibration-free concrete, high-durability concrete, low-heat mass concrete, etc. Background technique [0002] At present, the types of high-efficiency water reducers widely used in China are mainly naphthalenesulfonic acid formaldehyde condensates, sulfamic acid salts, and melamine. These water reducers all have certain limitations. The slump loss of concrete mixed with naphthalene-based and melamine-based high-efficiency water-reducers is fast, while sulfamate-based water-reducers are likely to cause separation and bleeding of concrete. In recent years, the various performance requirements of concrete in civil structures have been continuously improved, which puts forward higher requirement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B103/30
Inventor 郭鑫琪于飞宇麻秀星方云辉蒋卓君尹键丽温庆如林添兴
Owner KZJ NEW MATERIALS GROUP CO LTD
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