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Viscosity regulator and preparation method thereof and self-leveling self-compacting concrete

A technology of viscosity modifier and dense concrete, applied in the field of concrete, can solve the problems that the thickener cannot meet the requirements at the same time, affect the fluidity and filling property of concrete, and the concrete has no effect on segregation and bleeding, so as to prevent segregation and bleeding. , Increase viscosity, good compatibility

Active Publication Date: 2014-05-21
GUANGDONG REDWALL NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common disadvantage of these thickeners is that if the dosage is low, it will have no effect on the anti-segregation and bleeding of concrete; if the dosage is high, it will affect the fluidity and filling performance of concrete.
[0006] That is to say, the existing thickeners cannot meet the requirements at the same time: it can not only play a thickening role, prevent segregation and bleeding of concrete, but also not affect the fluidity of concrete.

Method used

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  • Viscosity regulator and preparation method thereof and self-leveling self-compacting concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] 1. Preparation of viscosity modifier

[0114] Grind 0.45g KOH into fine powder, add 60g of starch into 300ml of butylene oxide, stir at room temperature for 2 days, make the butylene oxide fully penetrate into the starch granules, make them fully wet and swell; heat up to Continue to react at 45-50°C for 48 hours, filter, and dry to obtain the reaction product hydroxybutyl starch ether, that is, the viscosity modifier.

[0115] 2. Apply the viscosity modifier to the preparation of concrete

[0116] First add 400kg of cement, 150kg of fly ash, 832kg of sand and 768kg of gravel, then add 25kg of slag powder, then add 86kg of water, then add 5.75kg of 20% solid content polycarboxylate superplasticizer and 0.4kg of viscosity modifier, Finally, add the remaining 86kg of water and stir evenly to obtain concrete.

Embodiment 2

[0118] 1. Preparation of viscosity modifier

[0119] Grind 0.3g KOH into fine powder, add 45g of starch into 260ml of butylene oxide, stir at room temperature for 2 days, make the butylene oxide fully penetrate into the starch granules, make them fully wet and swell; heat up to Continue to react at 45-50°C for 48 hours, filter, and dry to obtain the reaction product hydroxybutyl starch ether, that is, the viscosity modifier.

[0120] 2. Apply the viscosity modifier to the preparation of concrete

[0121] First add 400kg of cement, 150kg of fly ash, 832kg of sand and 768kg of gravel, then add 25kg of slag powder, then add 86kg of water, then add 5.75kg of 20% solid content polycarboxylate superplasticizer and 0.3kg of viscosity modifier, Finally, add the remaining 86kg of water and stir evenly to obtain concrete.

Embodiment 3

[0123] 1. Preparation of viscosity modifier

[0124] Grind 0.6g KOH into fine powder, add 75g of starch into 380ml of butylene oxide, stir at room temperature for 2 days, make the butylene oxide fully penetrate into the starch granules, make them fully wet and swell; heat up to Continue to react at 45-50°C for 48 hours, filter, and dry to obtain the reaction product hydroxybutyl starch ether, that is, the viscosity modifier.

[0125] 2. Apply the viscosity modifier to the preparation of concrete

[0126] First add 400kg of cement, 150kg of fly ash, 832kg of sand and 768kg of gravel, then add 25kg of slag powder, then add 86kg of water, then add 5.75kg of 20% solid content polycarboxylate superplasticizer and 0.5kg of viscosity modifier, Finally, add the remaining 86kg of water and stir evenly to obtain concrete.

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Abstract

The invention discloses a viscosity regulator which is exclusively applied to the self-leveling self-compacting concrete. The viscosity regulator is prepared mainly from the following raw materials in parts by weight: 15-85 parts of starch, 160-550 parts of epoxybutane and 0.1-2.0 parts of alkali. Correspondingly, the invention also discloses a preparation method of the viscosity regulator, which comprises the steps of grinding the alkali into fine powder, and adding the fine powder together with the starch into epoxybutane; stirring for two days at room temperature so that the epoxybutane sufficiently permeates into the starch particles to realize sufficient wetting and swelling; heating to 45-50 DEG C, and continuously reacting for 48 hours; filtering and drying to obtain a reaction product, namely hydroxybutyl starch ether. Meanwhile, the invention also discloses self-leveling self-compacting concrete using the viscosity regulator. By adopting the viscosity regulator disclosed by the invention, the viscosity of concrete slurry can be improved, a thickening effect is realized, and the separation and bleeding of the concrete are prevented without influencing the fluidity of the concrete.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a viscosity modifier, a preparation method thereof and a self-leveling and self-compacting concrete. Background technique [0002] Self-leveling and self-compacting concrete refers to the concrete that can flow and compact under its own gravity, and can completely fill the formwork even if there is dense steel reinforcement, while obtaining good homogeneity and requiring no additional vibration. The prominent feature of self-leveling and self-compacting concrete is its high fluidity, the slurry is suspended in the concrete, but it does not segregate and bleed. [0003] The workability of fresh self-leveling self-compacting concrete, also known as self-compacting, includes four important aspects: flow ability, filling ability, gap passing ability and anti-segregation ability. Flow capacity and filling capacity refer to the ability of self-compacting concrete to flow and fill the...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B28/00
CPCC04B24/38C04B2103/0059C04B2111/00103C04B20/023
Inventor 张小富白淑英赵利华翟冲
Owner GUANGDONG REDWALL NEW MATERIALS
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