Early-strength low-shrinkage prestressed tunnel pressure slurry and preparation method thereof

A technology of channel grouting and low shrinkage, which is applied in the field of building materials, can solve the problems of poor fluidity and stability of fresh grout, insufficient cohesion, and insufficient density of slurry, etc., achieve good viscosification effect, and solve shrinkage condition and early crack problems, good water storage - effect of water retention

Active Publication Date: 2019-11-08
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, my country's prestressed tunnel pressure slurry is mainly composed of cementitious materials, mineral powder, water reducer, expansion agent, retarder and other materials. Because it does not mix coarse and fine aggregates, the slurry There is serious shrinkage after setting, and the problem of early cracks is serious, which leads to adverse effects on the safety, mechanical properties and durability of the structure after the prestressed concrete is set.
At the same time, due to the diversification and variability of the current prestressed grout ingredients in my country, the fluidity and stability of the freshly mixed grout are poor, the construction performance is weak, and it is easy to produce segregation, stratification and bleeding. The density of the body is not enough, the porosity is large, and the bonding force with the prestressed tendon is not strong enough, so there is still a lot of room for improvement in the ingredients of the prestressed tunnel pressure grout

Method used

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  • Early-strength low-shrinkage prestressed tunnel pressure slurry and preparation method thereof
  • Early-strength low-shrinkage prestressed tunnel pressure slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This example provides a prestressed tunnel pressure slurry, which consists of the following raw materials by weight: 90% ordinary portland cement, 1% ultrafine attapulgite, 1.5% coal gasification residue, 0.008% poly Acrylamide, 0.1% water absorbent resin, 0.2% water reducer, 5% straw ash, 0.3% aluminum powder, 0.008% silane coupling agent, 0.2% defoamer, and the balance is water.

[0032] The preparation method of the above-mentioned prestressed tunnel pressure slurry comprises the following steps:

[0033] Step 1: taking the above-mentioned raw materials by mass;

[0034] Step 2: Spray the weighed water-reducing agent into a uniformly distributed powder, and the fineness is less than 1% with a 100-mesh sieve;

[0035] Step 3: Add an appropriate amount of water to the weighed silane coupling agent to make it into a solution with a concentration of 0.8%, add the weighed aluminum powder, ultrasonically oscillate for 4 minutes, and then stir at 25°C for 2.5 h, filter it...

Embodiment 2

[0038] This example provides a kind of prestressed tunnel pressure slurry, which consists of the following raw materials by weight: 90% ordinary portland cement, 0.5% ultrafine attapulgite, 1.5% coal gasification residue, 0.008% polystyrene Acrylamide, 0.2% water absorbent resin, 0.2% water reducer, 8% straw ash, 0.3% aluminum powder, 0.008% silane coupling agent, 0.2% defoamer, and the balance is water.

[0039] The preparation method of the above-mentioned prestressed tunnel pressure slurry comprises the following steps:

[0040] Step 1: taking the above-mentioned raw materials by mass;

[0041] Step 2: Spray the weighed water-reducing agent into a uniformly distributed powder, and the fineness is less than 1% with a 100-mesh sieve;

[0042] Step 3: Add an appropriate amount of water to the weighed silane coupling agent to make it into a solution with a concentration of 0.8%, add the weighed aluminum powder, ultrasonically oscillate for 4 minutes, and then stir at 25°C for ...

Embodiment 3

[0045] This example provides a prestressed tunnel pressure slurry, which consists of the following raw materials by weight: 92% ordinary portland cement, 0.5% ultrafine attapulgite, 1.5% coal gasification residue, 0.01% poly Acrylamide, 0.2% water absorbent resin, 0.2% water reducer, 8% straw ash, 0.3% aluminum powder, 0.008% silane coupling agent, 0.2% defoamer, and the balance is water.

[0046] The preparation method of the above-mentioned prestressed tunnel pressure slurry comprises the following steps:

[0047] Step 1: taking the above-mentioned raw materials by mass;

[0048] Step 2: Spray the weighed water-reducing agent into a uniformly distributed powder, and the fineness is less than 1% with a 100-mesh sieve;

[0049] Step 3: Add an appropriate amount of water to the weighed silane coupling agent to make it into a solution with a concentration of 0.8%, add the weighed aluminum powder, ultrasonically oscillate for 4 minutes, and then stir at 25°C for 2.5 h, filter it,...

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Abstract

The invention provides a prestressed duct grouting material with early strength and low shrinkage. The prestressed duct grouting material is prepared from the following raw materials by weight: 90 to 92% of cement, 0.5 to 2% of superfine attapulgite, 1.5% of gasified residue, 0.008 to 0.01% of polyacrylamide, 0.1 to 0.4% of water-absorbent resin, 0.2% of water reducing agent, 4 to 10% of straw ash, 0.3% of aluminum powder, 0.008% of silane coupling agent and 0.2% of defoaming agent. The prestressed duct grouting material provided by the invention has the advantages that the effects of excellent water holding property, excellent micro-expansion effect, good liquidity, freeness from segregation and bleeding and the like are achieved, the generation of a shrinkage crack of slurry at the early stage is relieved to a great degree, and the mechanical property and durability of the slurry are improved.

Description

【Technical field】 [0001] The invention belongs to the field of building materials, and relates to a prestressed tunnel pressure slurry, in particular to a prestressed tunnel pressure slurry with early strength and low shrinkage. 【Background technique】 [0002] Compared with ordinary concrete, prestressed concrete structures are widely used in highways, bridges and civil engineering projects in my country because of their advantages such as high strength, good crack resistance, high rigidity, low dead weight and good durability. At present, most of the prestressed concrete components in our country usually need to reserve channels during processing in order to penetrate the prestressed steel bars during the construction process. These reserved channels need to be filled with channel grout. As one of the very important processes in the prestressed concrete structure system, the tunnel press grout is required to effectively prevent the corrosion of the prestressed tendons, prov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/05C04B2201/50C04B14/102C04B18/065C04B24/2652C04B2103/0051C04B2103/302C04B18/101C04B22/04C04B2103/50
Inventor 何锐谈亚文耿瑶龙景潭黄鑫杨哲
Owner CHANGAN UNIV
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