Additive capable of improving bending strength and tensile strength of cement base material and its preparation method

A cement-based material and tensile strength technology, applied in the field of admixtures for cement-based material modification, can solve the problems of high cost, high polymer content, difficult preparation, etc., to increase the bonding area, improve mechanical properties, The effect of accelerating the hydration process

Active Publication Date: 2015-05-13
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (2) The amount of polymer in polymer modified concrete is too high
[0013] In addition, patents CN103130436A and CN101239800B respectively report the use of graphene (graphene oxide) and carbon nanotubes to modify cement-based materials to improve compressive, tensile, and flexural strengt

Method used

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  • Additive capable of improving bending strength and tensile strength of cement base material and its preparation method
  • Additive capable of improving bending strength and tensile strength of cement base material and its preparation method
  • Additive capable of improving bending strength and tensile strength of cement base material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] (1) Add polymerizable monomer A (code A1, polyethylene glycol methacrylate, -CH in the polyethylene glycol chain) to the reactor 2 CH 2 O-the average number of repeating units is 6, the terminal group is hydroxyl, and the amount is 0.1), polymerizable monomer B (0.29 parts of AA and 9.22 parts of methyl methacrylate (MMA)), crosslinking agent C (divinyl 5 parts of benzene (DVB), commercial DVB contains meta-position and para-position isomers) and 92.22 parts of water, fully stir and mix; pass N into the mixed solution 2 Divide O 2, the temperature of the reactor was raised to 80°C, and the initiator (0.05 parts of ammonium persulfate APS dissolved in 30 parts of water) was added to the reactor under agitation to initiate polymerization, and at the same time, the polymerizable monomer D was added dropwise to the reactor. (4.28 parts of acrylic acid and 81.13 parts of MMA), added dropwise for 5h. Timing was started when the initiator was added into the reactor, reacted...

Embodiment 2

[0077] (1) Add polymerizable monomer A (number A2, polyethylene glycol monomethyl ether acrylate, -CH in the polyethylene glycol chain) to the reactor 2 CH 2 O-the average number of repeating units is 22, the terminal group is a methyl group, and the dosage is 2.00 parts), polymerizable monomer B (0.49 parts of 4-aminostyrene hydrochloride (4-VBAH) and 97.51 parts of styrene (St) ), 3 parts of APS and 92.22 parts of water, fully stirred and mixed; 2 Divide O 2 , the temperature of the reactor was raised to 70° C., and the initiator (1.71 parts of sodium bisulfite SBS dissolved in 30 parts of water) was evenly added dropwise to the reactor under stirring conditions to initiate polymerization, and was added dropwise for 6 hours. Timing was started when the initiator was added to the reactor, reacted for 7 hours under polymerization conditions, and then removed the inert atmosphere protection to obtain the organic polymer core particle dispersion.

[0078] (2) After the temper...

Embodiment 3

[0085] (1) Add polymerizable monomer A (code A3, polyethylene glycol monomethyl ether methacrylate, -CH in polyethylene glycol chain) to the reactor 2 CH 2 O-the average number of repeating units is 45, and the dosage is 5.00 parts), polymerizable monomer B (2-hydroxyethyl acrylate (HEA) 1.38 parts, n-butyl acrylate (n-BuA) 17.12 and lauryl acrylate (LA ) 9.10 parts), the first part of crosslinking agent C (1 part of DVB) and 92.22 parts of water, fully stirred and mixed; pass N into the mixed solution 2 Divide O 2 , the temperature of the reactor was raised to 60°C, and the initiator (1 part of azobisisobutylamidine hydrochloride V50 dissolved in 30 parts of water) was added to the reactor under stirring conditions to initiate polymerization, and at the same time, the The second part of crosslinking agent C (2 parts of DVB) and polymerizable monomer D (1.29 parts of 4-VBAH and 63.11 parts of MMA) were added dropwise, and the second part of crosslinking agent C and polymeriz...

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Abstract

The invention discloses an additive capable of improving bending strength and tensile strength of a cement base material. The additive is an aqueous dispersion of organic-inorganic hybrid particles with core-shell structures. Each organic-inorganic hybrid particle is composed of inner and outer layers, wherein the inner layer is an organic polymer core; the outer layer is an inorganic composite oxide or an inorganic composite oxide covalently connected with an organic functional group; the inorganic composite oxide is a silicon-calcium composite oxide or a silicon-magnesium composite oxide or a silicon-calcium-magnesium composite oxide; and the outer layer is in covalent connection with an electronegative organic polyelectrolyte internally. Compared to the mixing amount of a polymer or polymer fiber in a pure polymer-modified cement base material or a polymer fiber-modified cement base material, the mixing amount of the additive in the cement base material can be greatly reduced; and the additive can more obviously improve the splitting tensile and bending resistant performances of the cement base material in comparison with a traditional polymer emulsion in the same mixing amount. Therefore, the additive overcomes the disadvantage that the high polymer mixing amount of the traditional polymer modified cement base material affects the compressive strength of the cement base material, and can effectively improve the bending strength and tensile strength (or splitting tensile strength) of the cement base material.

Description

technical field [0001] The invention relates to the field of admixtures used for modifying cement-based materials, in particular to an admixture capable of improving the flexural and tensile strength of cement-based materials. Background technique [0002] As used herein, the term "concrete" generally refers indiscriminately to cementitious materials such as concrete, mortar or grout, and this applies elsewhere herein as well. [0003] Ordinary cement concrete is a typical brittle material with high compressive strength but obviously insufficient bending and tensile strength. In actual use, it is easy to produce various cracks or damage due to stress concentration or uneven force, making it durable. For example, when it is applied to cement pavement, it is easy to cause premature plate fracture and surface structure damage, which limits its application in high-grade highways. [0004] People have carried out a lot of research on improving the brittleness of concrete, especi...

Claims

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Application Information

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IPC IPC(8): C04B24/16C04B22/06
Inventor 冉千平舒鑫刘浩杨勇于诚刘金芝刘加平
Owner JIANGSU SOBUTE NEW MATERIALS
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