A dual-expansion filling mortar

A technology of filling sand and double expansion, which is applied in the field of building materials and underground engineering, and can solve the problems of grout not filling, waterproofing and reinforcement, filling mortar being easily diluted by water, and structure damage of grouting materials, etc., so as to achieve good filling Self-compacting performance, excellent flow performance, reducing the effect of segment floating

Inactive Publication Date: 2018-05-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the scouring and erosion of the undercurrent in the formation, the filling mortar is easily diluted by water, resulting in structural damage to the grouting material. Phenomena such as sheet floating, surface subsidence, etc.

Method used

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  • A dual-expansion filling mortar

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Cement, 110kg / m 3 ;

[0017] Fly ash, 350kg / m 3 ;

[0018] Sand, 960kg / m 3 ;

[0019] Polycarboxylic acid water reducing agent powder, 1.84kg / m 3 ;

[0020] Sodium bentonite, 31.6kg / m 3 ;

[0021] Calcium magnesium swelling agent, 18.4kg / m 3 ;

[0022] Silica fume, 0;

[0023] Water, 322kg / m 3 .

[0024] Preparation process and test results:

[0025] 1) Using industrial tailings as raw materials, through mineral composition design, ingredient calculation, grinding and appropriate calcination process, a new type of calcium-magnesium expansion agent is prepared for use;

[0026] 2) Stir dry materials such as cement and filler evenly, add water reducing agent and water, and stir again to ensure that the functional materials are evenly dispersed in the mortar;

[0027] 3) Use JGJ 70-2009 "Test Method for Basic Performance of Building Mortar", JC / T985-2005 "Cement-based Self-Leveling Mortar for Floor" and GB / T8077-2012 "Test Method for Homogeneity of Concrete Admixtures" as the test Accord...

Embodiment 2

[0030] Cement, 110kg / m 3 ;

[0031] Fly ash, 300kg / m 3 ;

[0032] Sand, 960kg / m 3 ;

[0033] Polycarboxylic acid water reducing agent powder, 2.76kg / m 3 ;

[0034] Sodium bentonite, 31.6kg / m 3 ;

[0035] Calcium magnesium swelling agent, 18.4kg / m 3 ;

[0036] Silica fume, 0;

[0037] Water, 322kg / m 3 .

[0038] Preparation process and test results:

[0039] 1) Using industrial tailings as raw materials, through mineral composition design, ingredient calculation, grinding and appropriate calcination processes, a new type of calcium-magnesium expansion agent is prepared for use;

[0040] 2) Stir dry materials such as cement and filler evenly, add water reducing agent and water, and stir again to ensure that the functional materials are evenly dispersed in the mortar;

[0041] 3) Use JGJ 70-2009 "Test Method for Basic Performance of Building Mortar", JC / T985-2005 "Cement-based Self-Leveling Mortar for Floor" and GB / T8077-2012 "Test Method for Homogeneity of Concrete Admixtures" as the test Acco...

Embodiment 3

[0044] Cement, 110kg / m 3 ;

[0045] Fly ash, 350kg / m 3 ;

[0046] Sand, 960kg / m 3 ;

[0047] Polycarboxylic acid water reducing agent powder, 2.76kg / m 3 ;

[0048] Sodium bentonite, 22.4kg / m 3 ;

[0049] Calcium magnesium expanding agent, 27.6kg / m 3 ;

[0050] Silica fume, 0;

[0051] Water, 322kg / m 3 .

[0052] Preparation process and test results:

[0053] 1) Using industrial tailings as raw materials, through mineral composition design, ingredient calculation, grinding and appropriate calcination processes, a new type of calcium-magnesium expansion agent is prepared for use;

[0054] 2) Stir dry materials such as cement and filler evenly, add water reducing agent and water, and stir again to ensure that the functional materials are evenly dispersed in the mortar;

[0055] 3) Use JGJ 70-2009 "Test Method for Basic Performance of Building Mortar", JC / T985-2005 "Cement-based Self-Leveling Mortar for Floor" and GB / T8077-2012 "Test Method for Homogeneity of Concrete Admixtures" as the test Acc...

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Abstract

The invention provides double-expansion filling mortar. The double-expansion filling mortar per cubic meter comprises, by mass, the following ingredients of 100-120 kg of cement, 340-360 kg of fly-ash, 950-970 kg of sand, 1.84-2.76 kg of a water reducing agent, 50 kg of an expanding material, 0-13.8 kg of silica fume and 310-330 kg of water, wherein the water reducing agent is a polycarboxylate superplasticizer powder agent. The double-expansion filling mortar can be used for the fields including tunneling shields, coal mine backfilling, urban duct backfilling and the like, compared with traditional filling mortar, the mobility and the degree of density of the filling mortar are improved, the delayed coagulation is achieved, in addition, the transformation performance of the filling mortar is improved, and the economic benefit of the filling mortar is improved.

Description

Technical field [0001] The invention relates to the field of building materials and underground engineering, in particular to a double expansion filling mortar. Background technique [0002] Grouting technology is an important means of stratum improvement in underground engineering. It was first used in mine projects, dams, and foundation projects in some European countries in the early 19th century. The method was to inject grout into pores or caves in the rock. After a series of processes such as diffusion, solidification, and hardening, the permeability of the rock is reduced, and its stability and strength are increased, so as to achieve the purpose of strengthening and blocking water on the rock. The grouting material needs to be pumped under pressure, and the slurry may be eroded by groundwater during the grouting process. Therefore, it is required to have a high water retention capacity, and the strength only needs to support the soil to prevent sinking. Therefore, in ter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B24/24C04B18/08C04B14/12
CPCY02W30/91
Inventor 高培伟刘书斌徐少云姚应征耿飞鞠向伟马爱群刘祥勇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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