Duct grouting agent for post-tensioning prestressed concrete beams

A technology of channel grouting and prefabricated beams, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problem that volume stability, fluidity and other properties cannot meet the high requirements of high-speed passenger railway engineering, channel Problems such as low performance of grouting agent, to achieve the effect of good filling degree and volume stability, adjustable fluidity, and wide construction temperature

Inactive Publication Date: 2011-07-06
BEIJING ACAD OF BUILDING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The channel grouting agent used in ordinary projects has low performance, and its volume stability, fl

Method used

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  • Duct grouting agent for post-tensioning prestressed concrete beams

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The raw material composition ratio of this channel grouting agent is calculated by weight: water reducing component 100kg, late expansion component 550kg, plastic stage expansion component 2kg, water retention component 343kg, defoaming component 3kg, coagulation adjustment component 2kg .

Embodiment 2

[0026] The raw material composition ratio of this channel grouting agent is calculated by weight: water reducing component 110kg, late expansion component 550kg, plastic stage expansion component 5kg, water retention component 330kg, defoaming component 5kg, coagulation adjustment component 0kg .

Embodiment 3

[0028] The raw material composition ratio of this channel grouting agent is calculated by weight: water reducing component 100kg, late expansion component 500kg, plastic stage expansion component 5kg, water retention component 387kg, defoaming component 5kg, coagulation adjustment component 3kg .

[0029] The present invention is obtained by mixing the above-mentioned components uniformly. The present invention prepared by adopting the above formula is mixed with cement (externally mixed with 10%) and water to form press grout. According to the test method in TB / T3192-2008 "Technical Conditions for Pressure Drop of Railway Post-tensioned Concrete Beam Pipes", the test results are as follows:

[0030]

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PUM

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Abstract

The invention relates to a duct grouting agent for post-tensioning prestressed concrete beams, which is proportionally mixed with cement and water at a construction site for duct grouting and filling of the prestressed concrete beams. The duct grouting agent is characterized in that the duct grouting agent comprises the following components: 2 to 11 percent of water-reducing component, 0.3 to 0.6 percent of expansion component at a plastic stage, 30 to 40 percent of water-retaining component, 0.2 to 0.5 percent of antifoaming component, 0 to 0.4 percent of retarding component and 40 to 55 percent of expansion component at a later stage, wherein all the components are weighed according to the weight percentages and mixed to obtain the duct grouting agent. The duct grouting agent has the advantages of wide raw material sources, low cost, simpleness and convenience in operation, no pollution, high operability, good and adjustable fluidity, no bleeding under constant pressure, low bleeding rate under pressure, good uniformity, filling degree and volume stability, good protective effect to prestressed steel bars and no rust.

Description

technical field [0001] The invention is a high-performance grouting agent developed for grouting of post-tensioned prefabricated beam tunnels in high-speed passenger dedicated line projects, and is directly mixed with cement on the construction site for use. The slurry has the characteristics of good fluidity, early strength, high strength, and no shrinkage. It is an ideal prestressed channel grouting material. It can also be used for channel grouting in other prestressed structures such as highway bridges in general engineering. technical background [0002] As the main connector of various structures, the prestressed tunnel grout can not only protect the prestressed tendon from being corroded by harmful ions from the outside, ensure the safe life of the prestressed concrete structure and components, but also make the prestressed tendon and concrete Good combination ensures effective stress transfer between prestressed tendons and concrete components, eliminates fatigue da...

Claims

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Application Information

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IPC IPC(8): C04B24/16C04B24/20C04B24/26C04B24/38
CPCC04B40/0039Y02W30/91C04B22/008C04B28/04C04B2103/22C04B2103/302C04B2103/46C04B2103/50C04B14/02C04B18/08C04B18/146C04B24/16C04B24/226C04B24/24C04B24/2641C04B24/383C04B2103/10C04B22/085C04B22/16C04B24/06
Inventor 王万金贺奎盛喜忧
Owner BEIJING ACAD OF BUILDING ENG
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