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Viscosity reducer for ultra-high performance concrete and its preparation method and application

An ultra-high-performance, viscosity-reducing agent technology, applied in the field of concrete admixtures, can solve the problems of restricting the promotion and application of high-strength and ultra-high-strength concrete, poor workability, high viscosity, etc., to achieve low production costs, reduce viscosity, and increase mutual repulsion force effect

Active Publication Date: 2021-03-23
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a large amount of PCE is added, ultra-high-performance concrete contains a large amount of siliceous pozzolanic materials, which still has the defect of high viscosity, which causes a series of poor workability construction problems such as concrete mixing, transportation, and pumping, which largely limits high-strength concrete. The promotion and application of ultra-high-strength concrete

Method used

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  • Viscosity reducer for ultra-high performance concrete and its preparation method and application
  • Viscosity reducer for ultra-high performance concrete and its preparation method and application
  • Viscosity reducer for ultra-high performance concrete and its preparation method and application

Examples

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Embodiment 1

[0039] A kind of preparation method of ultra-high performance concrete viscosity reducer of the present embodiment, comprises the following steps:

[0040]Step 1: Add 10g of silica fume (average particle size 0.5μm) into 100g of water and ultrasonically disperse for 15 minutes (in other embodiments, the same or similar technical effect can be achieved if the dispersion time is 10-25 minutes), move to magnetic stirring and add dropwise 5g of vinyltriethoxysilane (VTEO) was dripped for 1 hour, and the reaction was continued for 2 hours to obtain a precursor solution.

[0041] Step 2: Add 137g of isopentenol polyoxyethylene ether fully dissolved in water to the precursor solution, pour 1.8g of hydrogen peroxide, stir for 1-2min, and gradually add a solution of 15.2g of acrylic acid and 30g of water, 0.3 A solution of 1 g of ascorbic acid, 0.76 g of mercaptothiol and 50 g of water was dripped for 2.5 hours, then reacted for 2 hours after the dropwise addition, and neutralized with...

Embodiment 2

[0043] A kind of preparation method of ultra-high performance concrete viscosity reducer of the present embodiment, comprises the following steps:

[0044] Step 1: Add 15g of fly ash (average particle size 5.6μm) into 120g of water and ultrasonically disperse for 25min, move to magnetic stirring and add 5g of γ-methacryloxypropyltrimethoxysilane (KH570) dropwise for 1h , and continue to react for 1 h to obtain a precursor solution.

[0045] Step 2: Add 140g of allyl alcohol polyoxyethylene ether fully dissolved in water to the precursor solution, pour 1.8g of hydrogen peroxide, stir for 1-2min, and gradually add a solution of 20g of methyl methacrylate and 50g of water at the same time , 0.5g of ascorbic acid, 0.9g of thioglycolic acid and 50g of water, drop it for 2 hours, react for 1.5 hours after the dropwise addition, neutralize it with sodium hydroxide until the pH is 7, and obtain the viscosity reducer for ultra-high performance concrete.

Embodiment 3

[0047] A kind of preparation method of ultra-high performance concrete viscosity reducer of the present embodiment, comprises the following steps:

[0048] Step 1: Add 20g of silica fume (average particle size 0.5μm) into 150g of water for ultrasonic dispersion for 20min, move to magnetic stirring and add dropwise 5g of γ-methacryloxypropyltrimethoxysilane (KH570) and 5g of vinyl trimethoxysilane The mixture of ethoxysilane (VTEO) was dropped after 2 hours, and the reaction was continued for 1 hour to obtain a precursor solution.

[0049] Step 2: Add 170g of allyl alcohol polyoxyethylene ether fully dissolved in water to the precursor solution, pour 1.8g of hydrogen peroxide, stir for 1-2min, and gradually add a solution of 30g of maleic anhydride and 70g of water, 0.5 A solution of 1 g of ascorbic acid, 0.7 g of mercaptopropionic acid and 50 g of water was dripped for 2.5 hours, then reacted for 1 hour after the dropwise addition, and neutralized with sodium hydroxide to a pH...

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Abstract

The invention discloses an ultra-high performance concrete viscosity reducer. The viscosity reducer comprises a siliceous volcanic ash material and a comb-shaped structure PCE polymer grafted on the surface of the siliceous volcanic ash material. The invention also provides a preparation method of the viscosity reducer, a monomer A and the siliceous volcanic ash material carry out a hydrolysis reaction to prepare a precursor, the precursor, a monomer B and a monomer C carry out an addition polymerization reaction to prepare the viscosity reducer, and the viscosity reducer can effectively reduce the viscosity of ultra-high performance concrete after being applied to the ultra-high performance concrete.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a viscosity reducer for ultra-high performance concrete and its preparation method and application. Background technique [0002] Ultra-high performance concrete (UHPC) has a compressive strength higher than 120MPa, has good toughness and excellent durability, and is currently the focus and hotspot of research at home and abroad. In order to achieve ultra-high strength, the water-cement ratio of the UHPC system is usually lower than 0.25, and it is necessary to introduce nano- or micron-scale mineral admixtures to fill the gaps between cement particles. Mineral admixtures usually play a filling effect, pozzolanic effect, ball effect and hydration nucleation effect in UHPC systems. Mineral admixtures have low density, small particle size, large specific surface area, high surface activity, strong adsorption between particles, and difficult dispersion. There are different degree...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F283/06C08F220/06C08F220/14C08F222/06C04B24/26C04B103/40
CPCC04B24/2605C04B24/2647C04B24/267C04B2103/408C08F283/065C08F292/00C08F220/06C08F220/14C08F222/06
Inventor 王敏姚灏
Owner HUNAN UNIV
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