Tackifier of cement-base material and its preparation method and application

A technology of cement-based materials and tackifiers, applied in the field of building materials, can solve the problems of high price and unfavorable promotion and application, and achieve the effects of strong practicability, cost reduction, and solution to segregation and bleeding problems

Inactive Publication Date: 2008-08-13
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

They improve the firmness and homogeneity of high fluidity concrete and self-compacting concrete to a certain extent, but their high price is not conducive to popularization and application

Method used

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  • Tackifier of cement-base material and its preparation method and application
  • Tackifier of cement-base material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1, the preparation method of the tackifier of cement-based material.

[0016] (1) Add 10 parts of acrylic acid, 50 parts of methylphenylpropane containing phenolic hydroxyl groups and concentrated sulfuric acid as a catalyst into a four-necked flask, heat up to 90±2°C while stirring, and perform an esterification reaction for 6 hours; Add 3 parts of acrylic acid and catalyst potassium persulfate, the reaction temperature is 85±2°C, react for 3 hours, then add dropwise 20 parts of formaldehyde solution with a concentration of 37%, and react for 1 hour; after the reaction is completed, adjust the pH of the reaction mixture with NaOH 6-7.

[0017] (2) Add 10 parts of maleic acid, 50 parts of methylphenylpropane containing phenolic hydroxyl groups and catalyst p-toluenesulfonic acid into a four-necked flask, heat up to 90±2°C while stirring, and perform esterification for 6 hours; Add 1.7 parts of maleic acid and catalyst ammonium persulfate after the reaction i...

Embodiment 2

[0018] Embodiment 2, the application example of tackifier

[0019] Application example of the present invention in large-volume fly ash self-compacting concrete: 230kg of cement, 230kg of fly ash, 900kg of sand, 800kg of 5-20mm stones, 170kg of water, 1.5kg of high-efficiency water reducer, and the tackifier of the present invention 138g. The indicators of the concrete after mixing are as follows: slump expansion degree 700mm, J-ring expansion degree 660mm, L-shaped box height ratio 0.87, U-shaped box flow height 330mm, concrete viscosity 65Pa·S, water retention and viscosity increase effect is obvious, no obvious Segregation and bleeding phenomenon.

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Abstract

The present invention discloses an adhesion promoter of a cement-based material and the preparing method and the use thereof, the invention is the adhesion promoter of the cement-based material which is obtained using the papermaking waste liquor, extracting the methyphenylpropane of the phenol-containing hydroxyl group, generating esterifying reaction with the carboxyl monomer under the function of the catalyst and then copolymerizing with the carboxyl acid, or graft-copolymerizing with the acidamide substance and ahs a comb-shaped structure. When the adhesion promoter is mixed into the cement-based material the appropriate thickness and workability can be endowed to the cement-based material, the mixed water is leaded to be uniformly distributed in the cement-based material and can be kept stable for a long time without discharging out, at the same time the adhesion promoter of the invention increases the viscosity of the paste and leads to that the particles of aggregate is not easily moved thereby effectively preventing the disengagement and facilitating that the cement-based material always keeps better homogeneity.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a tackifier for cement-based materials, a preparation method and its application in concrete construction. Background technique [0002] In modern concrete construction, high fluidity concrete and self-compacting concrete are more and more widely used due to their high constructability. However, large fluidity concrete and self-compacting concrete often have segregation and bleeding phenomena during construction, which has adverse effects on construction operations and project quality. Therefore, it needs to add a certain amount of substance to keep it sticky and firm. The thickeners used in the past are mainly cellulose ethers, including sodium carboxymethyl cellulose, methyl cellulose, ethyl cellulose, and hydroxypropyl methyl cellulose ether. They have improved the solidity and homogeneity of high fluidity concrete and self-compacting concrete to a certain extent, but their...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B103/44
CPCC04B28/02C04B24/2647C04B2103/34C04B2111/00103
Inventor 蒋亚清杨培杰潘云峰
Owner HOHAI UNIV
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