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High-strength prestressed duct grouting agent

A channel grouting and prestressing technology, applied in the field of grouting agents, can solve problems such as lack of control, and achieve the effect of improving mechanical strength properties

Active Publication Date: 2020-04-10
武汉品泰特种建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The grouting agent prepared by using these raw materials mixed with cement, although the setting time meets the requirements of relevant standards, it is not controlled within a more reasonable range, and the bleeding rate also needs to be further controlled, and its mechanical strength performance is still limited. room for further improvement

Method used

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  • High-strength prestressed duct grouting agent
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The high-strength prestressed channel grouting agent provided in this example includes 39wt% of viscosity modifier, 28wt% of coagulation regulator, 22wt% of modified sodium hydroxide powder, 10.5wt% of water reducer, and 0.5wt% of defoamer ;

[0030] Wherein, the concrete preparation method of viscosity modifier is:

[0031] A1. Take superfine calcium carbonate hollow balls and pullulan polysaccharide according to the weight ratio of 1:2, add water 20 times the weight of pullulan polysaccharide and / or welan gum, and stir for 30min under a pressure of 0.2MPa. 800r / min, to obtain a suspension;

[0032] A2. Take the filter residue by membrane filtration, and vacuum-dry to obtain the finished product of the viscosity modifier. The absorbance of the pullulan in the ultrafine calcium carbonate hollow spheres is detected by a spectrophotometer, and compared with the absorbance of the original pullulan, the encapsulation efficiency of the pulland is measured to be 92.93%.

...

Embodiment 2

[0038] The high-strength prestressed channel grouting agent provided in this embodiment includes 42wt% of viscosity modifier, 30wt% of coagulation regulator, 15wt% of modified sodium hydroxide powder, 12.5wt% of water reducer, and 0.5wt% of defoamer The concrete preparation method of viscosity modifier, coagulation regulator is identical with embodiment 1.

Embodiment 3

[0040] The high-strength prestressed channel grouting agent provided in this example includes 34wt% of viscosity modifier, 27wt% of coagulation regulator, 24wt% of modified sodium hydroxide powder, 14.5wt% of water reducer, and 0.5wt% of defoamer The concrete preparation method of viscosity modifier, coagulation regulator is identical with embodiment 1.

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Abstract

The invention discloses a high-strength prestressed duct grouting agent. The grouting agent comprises 34-42 wt% of a viscosity modifier, 22-30 wt% of a thickening time control agent, 15-24 wt% of modified sodium hydroxide powder, 3.5-14.5 wt% of a water reducing agent and 0.5 wt% of a defoaming agent, wherein the viscosity modifier is a superfine calcium carbonate hollow sphere with Pulullan and / or welan gum embedded in the inner cavity; the thickening time control agent is a superfine silicon dioxide hollow sphere with molasses embedded in the inner cavity; and the modified sodium hydroxide powder is paraffin-coated sodium hydroxide powder. The synergistic effects of the viscosity modifier, the thickening time control agent and the modified sodium hydroxide powder are utilized to form a gel latticed structure in the grouting agent, and other components of the grouting agent are fixed in lattices, so the mechanical strength performance of a grouting material finally prepared from the grouting agent is improved to the maximum extent on the basis that ideal construction time and setting time are guaranteed.

Description

technical field [0001] The invention belongs to the field of grouting agents, in particular to a high-strength prestressed tunnel grouting agent. Background technique [0002] Prestressed concrete members have the characteristics of high rigidity, high strength, strong shear resistance and good fatigue resistance, which can effectively reduce the structural section size, reduce self-weight, prevent cracking and reduce deflection. be widely used. Prestressed concrete components need to reserve channels during processing to allow prestressed steel bars to pass through. After prestressing the prestressed steel bars, fill the channels with grout to combine the prestressed steel bars with the structural concrete. They can give full play to their strengths and obtain excellent mechanical properties and structural properties. The performance indicators of this prestressed channel grouting agent must meet the "Technical Specifications for Highway Bridge and Culvert Construction" (...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B24/10C04B24/38C04B22/06C04B20/10C04B103/22C04B103/44
CPCC04B40/0039C04B20/1044C04B2103/22C04B2103/445C04B22/062C04B2103/302C04B24/42C04B28/04C04B22/10C04B24/38C04B22/06C04B24/10
Inventor 汪进国郭偲
Owner 武汉品泰特种建材科技有限公司
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