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Grouting material for large bridge support and preparation method thereof

A bridge bearing and grouting material technology, which is applied in the field of building materials, can solve the problems of poor freeze-thaw durability and slow early strength development, and achieve the effects of reducing shrinkage and thermal expansion coefficient, improving early strength, and increasing density

Active Publication Date: 2020-10-30
SHIJIAZHUANG TIEDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of slow early strength development and poor freeze-thaw durability existing in existing grouting materials, the present invention provides a grouting material for large bridge supports and a preparation method thereof

Method used

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  • Grouting material for large bridge support and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A grouting material for large bridge supports, including the following raw material components in parts by mass: 30 parts of 72.5 grade rapid hardening sulfoaluminate cement; 30 parts of stone; 28 parts of natural sand; 4 parts of grade II fly ash 1.2 parts of polyacrylate-polyurethane copolymer emulsion (solid content is 50%); 1.5 parts of dihydrate gypsum; 0.5 part of hardening agent; 0.1 part of retarder; 0.3 parts of water and 9.6 parts of water,

[0031] Wherein, the hardening accelerator is a mixture of calcium formate and sodium nitrite with a mass ratio of 1:1.2; the retarder is a mixture of sodium gluconate and boric acid with a mass ratio of 1:3.8;

[0032]The solid content of the polyacrylate-polyurethane copolymer emulsion is 50%, and the molar ratio of the polyurethane part to the polyacrylate part in the polyacrylate-polyurethane copolymer segment is 20:80. The specific preparation method is as follows:

[0033] S1: Polypropylene glycol 600 and castor oil...

Embodiment 2

[0039] A grouting material for large bridge supports, including the following raw material components in parts by mass: 28 parts of 72.5 grade rapid hardening sulfoaluminate cement; 38 parts of stone; 30 parts of natural sand; 3 parts of grade II fly ash 1.7 parts of polyacrylate-polyurethane copolymer emulsion (solid content is 40%); 2 parts of dihydrate gypsum; 0.5 part of hardener; 0.2 part of retarder; 0.2 parts of water and 9.5 parts of water,

[0040] Wherein, the hardening accelerator is a mixture of calcium formate and sodium nitrite with a mass ratio of 1:0.8; the retarder is a mixture of sodium gluconate and boric acid with a mass ratio of 1:3.2;

[0041] The solid content of the polyacrylate-polyurethane copolymer emulsion is 40%, and the molar ratio of the polyurethane part to the polyacrylate part in the polyacrylate-polyurethane copolymer segment is 10:90. The specific preparation method is as follows:

[0042] S1: Polypropylene glycol 600 and castor oil with a ...

Embodiment 3

[0048] A grouting material for large bridge supports, including the following raw material components in parts by mass: 26 parts of 72.5 grade rapid hardening sulfoaluminate cement; 32 parts of stone; 28 parts of natural sand; 6 parts of grade II fly ash 0.5 part of polyacrylate-polyurethane copolymer emulsion (solid content is 30%); 1 part of dihydrate gypsum; 0.8 part of hardener; 0.08 part of retarder; 0.4 parts of water and 9.4 parts of water,

[0049] Wherein, the hardening accelerator is a mixture of calcium formate and sodium nitrite with a mass ratio of 1:1; the retarder is a mixture of sodium gluconate and boric acid with a mass ratio of 1:3.5;

[0050] The solid content of the polyacrylate-polyurethane copolymer emulsion is 30%, and the molar ratio of the polyurethane part to the polyacrylate part in the polyacrylate-polyurethane copolymer segment is 15:85. The specific preparation method is as follows:

[0051] S1: Polypropylene glycol 600 and castor oil with a mol...

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Abstract

The invention relates to the technical field of building materials, and particularly discloses a grouting material for a large bridge support and a preparation method of the grouting material. The grouting material comprises the following raw material components in parts by mass: 20 to 40 parts of cement, 30 to 60 parts of stone, 20 to 45 parts of natural sand, 3-6 parts of fly ash, 0.3 to 2 partsof a polyacrylate-polyurethane copolymer emulsion, 1 to 4 parts of gypsum, 0.4 to 0.8 part of a hardening accelerator, 0.08 to 0.2 part of a retarder, 0.02 to 0.08 part of a defoaming agent, 0.1 to 0.4 part of a water reducing agent, and 6 to 12 parts of water. The grouting material provided by the invention has the characteristics of high hardening speed, good early strength, high compactness, good anti-freezing durability and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a grouting material for large bridge supports and a preparation method thereof. Background technique [0002] The bridge support is an important structure connecting the upper and lower parts of the bridge. The flatness and strength of the support after installation and anchorage directly affect the performance of the support, which in turn affects the driving safety and comfort of the bridge. The current anchoring materials mostly use cement-based grouting materials, which have good construction and quality stability. [0003] However, the existing grouting materials still have the problem of slow strength development in the early stage. The beams and slabs cannot be erected immediately after the support is installed, and it is not easy to build bridge supports. In addition, drying shrinkage and temperature stress are easy to occur during the hydration process of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B111/20C04B111/70
CPCC04B28/06C04B2111/70C04B2201/50C04B2201/05C04B2111/20C04B14/02C04B14/06C04B18/08C04B24/28C04B22/143C04B22/085C04B24/04C04B24/10C04B22/0013C04B2103/50C04B2103/302
Inventor 高振国张成刘淼王磊冯旭
Owner SHIJIAZHUANG TIEDAO UNIV
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