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Special shrinkage reducing agent for concrete mortar

A concrete mortar and shrinkage reducing agent technology, which is applied in the field of building material additives, can solve the problems of poor shrinkage reduction performance of concrete, and achieve the effects of good water absorption and water retention, shrinkage reduction, good emulsification and surface activity

Inactive Publication Date: 2018-05-11
胡果青
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention is: aiming at the problem of poor shrinkage reduction performance of traditional concrete, a special shrinkage reducer for concrete mortar is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] Mix cornstarch and water into a beaker according to the mass ratio of 1:12, and transfer the beaker to a digital speed measuring constant temperature magnetic stirrer, and stir and mix at a constant temperature for 4 hours at a temperature of 65°C and a speed of 1200r / min. Obtain starch slurry; stir and mix octenyl succinic anhydride and absolute ethanol at a mass ratio of 1:10 to obtain an acid anhydride dilution; weigh the starch slurry and acid anhydride dilution at a mass ratio of 1:25, and pour the starch slurry into the reaction kettle, and then the acid anhydride dilution is added dropwise to the reaction kettle through the dropping funnel, and the acceleration rate of the acid anhydride dilution drop is controlled to 10mL / min. After the acid anhydride dilution is added dropwise, the pH in the reaction kettle is adjusted to 9.0, continue to stir and react at constant temperature for 5 hours, adjust the pH in the reactor to neutral with hydrochloric acid, then tran...

example 2

[0030]In parts by weight, take 20 parts of lightweight aggregate, 6 parts of N,N-dimethylcyclohexylamine, 5 parts of calcium bicarbonate, 3 parts of water reducer, 3 parts of defoamer, and 3 parts of air-entraining agent , first mix the lightweight aggregate, N,N-dimethylcyclohexylamine and calcium bicarbonate at room temperature with a stirrer at a speed of 600r / min for 3 hours, then add water reducer, defoamer and air-entraining agent agent, continue to stir and mix for 3 hours, discharge, and fill to obtain the special shrinkage reducer for concrete mortar. The lightweight aggregate is chitosan. The water reducer is lignosulfonate. The defoamer is emulsified silicone oil. The air-entraining agent is sodium alkylbenzene sulfonate. The oil is liquid paraffin.

example 3

[0032] Pour cornstarch and water into the mixer at a mass ratio of 1:50, stir and mix at a speed of 800r / min for 60 minutes, then add oil 0.2 times the quality of water into the mixer, and continue to rotate at a speed of 800r / min Stir and mix for 30 minutes to obtain a mixed solution, then use a high-speed disperser to disperse the obtained mixed solution at a high speed of 20000r / min for 45 minutes to obtain a dispersion, then transfer the obtained dispersion to a high-pressure homogenizer, homogeneous, discharging, to obtain modified starch emulsion; in parts by weight, successively get 100 parts of modified starch emulsion, 20 parts of lightweight aggregate, 6 parts of N,N-dimethylcyclohexylamine, 5 parts of calcium bicarbonate, 3 parts of water reducer, 3 parts of defoamer, 3 parts of air-entraining agent, first mix modified starch emulsion, lightweight aggregate, N,N-dimethylcyclohexylamine and calcium bicarbonate at room temperature, and use a stirrer Stir and mix at a ...

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Abstract

The invention discloses a special shrinkage reducing agent for concrete mortar. The special shrinkage reducing agent for the concrete mortar belongs to the technical field of building material auxiliaries, and is prepared from a modified starch emulsion, a lightweight aggregate, N,N-dimethyl cyclohexyl amine, calcium bicarbonate, a water reducing agent, a defoaming agent and an air entraining agent, wherein the modified starch emulsion is obtained through stirring and mixing octenyl succinic acid modified starch and water, adding oil liquid, continuously stirring and mixing, dispersing at highspeed, and homogenizing at high pressure. The special shrinkage reducing agent for the concrete mortar is prepared through stirring and mixing the modified starch emulsion, the lightweight aggregate,the N,N-dimethyl cyclohexyl amine and the calcium bicarbonate, adding the water reducing agent, the defoaming agent and the air entraining agent, continuously stirring and mixing, discharging and filling. The special shrinkage reducing agent for the concrete mortar provided by the invention has an excellent reducing performance.

Description

technical field [0001] The invention discloses a special shrinkage reducer for concrete mortar, which belongs to the technical field of building material additives. Background technique [0002] Foamed concrete is popular because of its light weight, thermal insulation, fire prevention, earthquake resistance, sound insulation and other functions, and its annual output is close to 1.7×10 7 m 3 . However, factors such as high porosity, high cementitious material content and lack of aggregates lead to rapid water loss and large dry shrinkage of foamed concrete in a dry environment, and high chemical shrinkage caused by high cementitious material content, prompting foamed concrete to exhibit Larger self-shrinkage. Significant drying shrinkage and autogenous shrinkage show large volumetric deformation macroscopically under the limitation of lack of aggregate. When the deformation is restrained, it is easy to crack. Cracking will degrade its thermal and mechanical properties,...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B24/38C04B24/12C04B22/10
CPCC04B22/106C04B24/121C04B24/38C04B40/0039C04B22/002C04B24/36C04B24/18C04B24/42C04B24/20
Inventor 龙国华许玉张淼
Owner 胡果青
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