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A kind of viscosity reducer for ultra-high performance concrete and preparation method thereof

An ultra-high performance, viscosity reducing agent technology, applied in the field of concrete admixtures, can solve problems such as difficulty in application, and achieve the effect of enhancing dispersion performance, reducing aggregation tendency, and enhancing dispersion

Active Publication Date: 2022-01-11
CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD
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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 provide a viscosity reducer for ultra-high performance concrete and a preparation method thereof for existing viscosity reducers that are difficult to apply to ultra-high performance concrete with a water-binder ratio of 0.2 and below 0.2.

Method used

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  • A kind of viscosity reducer for ultra-high performance concrete and preparation method thereof
  • A kind of viscosity reducer for ultra-high performance concrete and preparation method thereof
  • A kind of viscosity reducer for ultra-high performance concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 500g of polyethylene glycol (weight average molecular weight 200g / mol) into a four-necked flask, raise the temperature to 30°C, stir, then add 185g of phthalic anhydride, then add 0.1g of concentrated sulfuric acid, stir for 2 hours, add 100g Phosphoric acid, 50g of water, heated up to 60°C, stirred for 2 hours to obtain a reddish-brown liquid which is the viscosity reducer (solid content 94.0%). At the end of the reaction, the phthalic anhydride content in the reaction solution was monitored by HPLC to be less than 5%, and the phosphate content was determined to be less than 6% by titration. The following examples are the same as this method. (HPLC detection method and titration method measure phosphate radical content are routine standard methods, do not repeat at this)

Embodiment 2

[0030] Add polypropylene glycol 500g (weight average molecular weight 800g / mol) in four-neck flask, heat up to 40 DEG C, stir, then add phthalic anhydride 46g, then add 0.1g concentrated sulfuric acid, stir and react for 1 hour, add phosphoric acid aqueous solution ( 25g phosphoric acid and the mixture of 20g water), be warming up to 50 ℃, stir 3 hours to obtain reddish-brown liquid and be viscosity reducing agent (solid content 96.6%).

Embodiment 3

[0032] Add 500g of polypropylene glycol (weight average molecular weight: 2000g / mol) into a four-neck flask, raise the temperature to 40°C, stir, then add 18.5g of phthalic anhydride, then add 0.1g of p-toluenesulfonic acid, stir for 2 hours, add Phosphoric acid aqueous solution (a mixture of 10g polyphosphoric acid and 10g water), heated up to 60°C, stirred for 2 hours to obtain a reddish-brown liquid which is the viscosity reducer (solid content 98%).

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Abstract

The invention discloses a viscosity reducer for ultra-high-performance concrete, which is prepared by using phthalic anhydride, polyol polymer and phosphorylation reagent as raw materials and reacting with a catalyst; the polyol polymer is polyethylene glycol or Polypropylene glycol; the phosphorylation reagent is one of phosphoric acid, phosphorus pentoxide, polyphosphoric acid, and sodium phosphate; the molar ratio of phthalic anhydride, polyol polymer, and phosphorylation reagent is 1:(1.1~1.5) : (1.1~1.7). The preparation method of the viscosity reducer is as follows: step 1, add polyol polymer into a four-necked flask, control the temperature at 30°C to 40°C, stir, add phthalic anhydride, then add catalyst, and stir for 1 to 2 hours; Step 2: Add the phosphorylation reagent aqueous solution to step 1, control the temperature at 50°C-60°C, stir and react for 2-3 hours, and cool to room temperature to obtain the viscosity reducer. The viscosity reducer is used in ultra-high-performance concrete with a water-binder ratio of 0.12 to 0.2, and can significantly reduce the viscosity of the concrete and improve the workability of the concrete.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a viscosity reducer for ultra-high performance concrete and a preparation method thereof. Background technique [0002] Ultra-high performance concrete has the characteristics of high strength, large load capacity, resource saving, and excellent durability. It is one of the important directions for the development of concrete technology to meet the requirements of lightweight, high-rise, large-span and durability of construction projects. One of the characteristics of ultra-high performance concrete composition is ultra-low water-binder ratio (below 0.20). As the water-binder ratio decreases, the viscosity of the concrete mixture increases, causing construction problems such as difficulty in mixing and pumping, which largely limits its application. How to reduce the viscosity of concrete has become a key issue in the development of ultra-high performance concrete. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/08
CPCC04B40/0039C04B24/32C04B24/045C08G65/327C08G65/331C07C67/08C07F9/091C04B2103/0068C04B2103/0078C04B2103/008C04B2103/0081C07C69/80
Inventor 高育欣刘明张磊杨文王军叶子
Owner CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD
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