Concrete internal curing agent, preparation method and applications thereof

A concrete internal curing agent technology, which is applied in the field of concrete internal curing agent and preparation, can solve the problems of difficult heat dissipation and poor mechanical properties, and achieve the effects of simple equipment, low production cost, and overcoming uneven heat transfer

Inactive Publication Date: 2020-02-04
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of poor mechanical properties or difficult heat dissipation of alkali-r

Method used

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  • Concrete internal curing agent, preparation method and applications thereof
  • Concrete internal curing agent, preparation method and applications thereof
  • Concrete internal curing agent, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Weigh 0.5g of sorbitan fatty acid ester and 0.05g of polyoxyethylene sorbitan monooleate, dissolve them in 70mL of n-heptane, stir thoroughly to obtain a mixed solution, and then add it to the three-port In the flask, place it in a water bath at 40°C and stir it thoroughly, and pass N 2 , control the stirring speed at 500rpm, and stir for 40min to fully mix to form an oil phase system;

[0046] Pipette 0.12mL of methacrylic acid (anion: non-ionic mass ratio 1:10) into a glass test tube, and add 0.036g NaOH (neutralization degree is 65%) and 1mL deionized water to it, Shake to dissolve, then add 1.218g N-isopropylacrylamide, 0.06g N,N'-methylene bisacrylamide, 0.1g potassium persulfate, 5mL deionized water to the above mixed solution, and mix thoroughly to prepare water phase system;

[0047] (2) Keep the water bath temperature at 40°C, N 2 Under protection, add the water phase system prepared in step (1) to the oil phase system in step (1), control the rotation s...

Embodiment 2

[0051] (1) Weigh 0.5g of sorbitan fatty acid ester and 0.05g of polyoxyethylene sorbitan monooleate, dissolve them in 70mL of n-heptane, stir thoroughly to obtain a mixed solution, and then add it to the three-port In the flask, place it in a water bath at 30°C and stir it thoroughly, and inject N 2 , control the stirring speed to 500rpm, and stir for 40min to fully mix to form an oil phase system;

[0052] Use a pipette to pipette 0.24mL of acrylic acid (anion: non-ionic mass ratio 1:5) into a glass test tube, and add 0.079gNaOH (neutralization degree is 70%) and 2mL deionized water to it, shake to dissolve, and then Add 1.218g of N-isopropylacrylamide, 0.06g of N,N'-methylenebisacrylamide, 0.1g of potassium persulfate, and 5mL of deionized water to the above mixture, mix thoroughly, and prepare an aqueous phase system;

[0053] (2) Keep the water bath temperature at 40°C, N 2 Under protection, add the water phase system prepared in step (1) into the oil phase system, contr...

Embodiment 3

[0056] (1) Weigh 0.5g of sorbitan fatty acid ester and 0.05g of polyoxyethylene sorbitan monooleate, dissolve them in 75mL of n-heptane, stir thoroughly to obtain a mixed solution, and then add it to the three-port In the flask, place it in a water bath at 30°C and stir it thoroughly, and inject N 2 , control the stirring speed to 500rpm, and stir for 40min to fully mix to form an oil phase system;

[0057] Use a pipette to pipette 0.5 mL of methacrylic acid (anion: non-ionic mass ratio 1:2) into a glass test tube, and add 0.212 g of NaOH (neutralization degree is 75%) and 5 mL of deionized water to it, Shake to dissolve, then add 1.015g N-isopropylacrylamide, 0.06g N,N'-methylene bisacrylamide, 0.1g ammonium persulfate, 5mL deionized water to the above mixture, mix well, and prepare Aqueous system.

[0058] (2) Keep the water bath temperature at 30°C, N 2 Under protection, add the water phase system prepared in step (1) into the oil phase system, control the rotation speed...

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Abstract

The invention discloses a concrete internal curing agent, a preparation method and applications thereof, and belongs to the field of chemical synthesis. The preparation method comprises: 1) dispersingtwo emulsifiers in a dispersion medium at a room temperature to form an oil phase system, adjusting the neutralization degree of an anionic monomer aqueous solution, mixing the neutralized anionic monomer aqueous solution and a nonionic monomer aqueous solution, and adding a cross-linking agent and an initiator to form a water phase system; 2) under the protection of an inert gas, adding the water phase system into the oil phase system, and carrying out a reaction until a gel appears; and 3) taking the gel, washing, and drying to obtain the white powdery concrete internal curing agent. According to the invention, the concrete internal curing agent obtained by the preparation method is moderate in water absorption rate, integrates hydrophilic and alkali-resistant groups, ensures the moisture required by later hydration of cement, and reduces the negative influence on the strength of concrete after water release based on small particle size.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, in particular to a concrete internal curing agent, a preparation method and an application thereof. Background technique [0002] High-performance concrete has been widely used in large-scale projects such as bridges and high-rise buildings because of its compact structure, superior working performance and high durability. However, due to the insufficient hydration of the cement caused by the low water-cement ratio, a large volume shrinkage occurs in the early stage, and a large number of microcracks are generated, which eventually leads to cracking. Common external curing techniques such as watering and paving have great limitations in alleviating the internal self-drying phenomenon of concrete. This is because the internal structure of high-performance concrete is dense, and the moisture in traditional external curing methods cannot fully penetrate into the interior of the concrete and cannot ...

Claims

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Application Information

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IPC IPC(8): C08F220/54C08F220/06C08F222/38C08F2/32C08F4/30C04B24/26
CPCC04B24/2688C04B2103/0051C08F2/32C08F4/30C08F220/54C08F220/06C08F222/385
Inventor 夏慧芸张耿通赵旭刘冠宇宋莉芳陈华鑫
Owner CHANGAN UNIV
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