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Early strength cement grout with low dehydration ratio for grouting

A technology of cement slurry and water separation rate, applied in the field of cement slurry, can solve the problems of poor suspension stability and uncontrollable diffusion distance of single-liquid cement slurry, improve the suspension stability, effectively control the diffusion radius, and improve the resistance to water dilution. effect of ability

Inactive Publication Date: 2010-01-20
BEIJING CHINA COAL MINE ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of poor suspension stability and uncontrollable diffusion distance of single-liquid cement slurry, the present invention provides a composite cement slurry suitable for hydrogeological characteristics of fault zones and bedrock weathering zones

Method used

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  • Early strength cement grout with low dehydration ratio for grouting
  • Early strength cement grout with low dehydration ratio for grouting
  • Early strength cement grout with low dehydration ratio for grouting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The low water-separation rate early-strength cement slurry for coal wellbore grouting in this embodiment consists of the following components: 100 kg of No. 425 ordinary Portland cement, 80 kg of water, 10 kg of silica sol, 1 kg of sodium carbonate, and 0.03 kg of diethanolamine.

[0016] The water separation rate of the cement slurry in this embodiment is 0, the initial setting time is 4.5 hours, and the final setting time is 5.4 hours.

[0017] In order to further characterize the early strength performance of the slurry, the hourly compressive strength of the slurry stone body was measured. The experimental results are shown in Table 1.

[0018] Early compressive strength of grout Table 1

[0019]

[0020] It can be seen from Table 1 that the early strength of the slurry is significantly improved, and the compressive strength of the stone body can reach 0.32MPa in 6 hours, and the compressive strength can reach more than 3.5MPa in 12 hours.

[0021] The addition...

Embodiment 2

[0029] The low water-separation rate early-strength cement slurry used for coal shaft grouting in this embodiment is composed of the following components: 100 kg of No. 425 ordinary Portland cement, 80 kg of water, 12 kg of silica sol, 1 kg of sodium carbonate, and 0.08 kg of triisopropanolamine .

[0030] The water separation rate of the cement slurry in this embodiment is 0%, the initial setting time is 4.3 hours, and the final setting time is 5.2 hours.

[0031] In order to further characterize the early strength performance of the slurry, the hourly compressive strength of the slurry stone body was measured. The experimental results are shown in Table 3.

[0032] Early compressive strength of grout Table 3

[0033]

[0034] It can be seen from Table 3 that the early strength of the slurry is significantly improved, and the compressive strength of the stone body can reach 0.4MPa in 6 hours, and the compressive strength can reach more than 3.8MPa in 12 hours.

[0035] ...

Embodiment 3

[0042] The low water-separation rate early-strength cement slurry for coal wellbore grouting in this embodiment consists of the following components: 100 kg of No. 425 ordinary Portland cement, 100 kg of water, 36 kg of silica sol, 1 kg of sodium carbonate, and 0.06 kg of diethanolamine.

[0043] The water separation rate of the cement slurry in this embodiment is 1%, the initial setting time is 5.3 hours, and the final setting time is 5.8 hours.

[0044] In order to further characterize the early strength performance of the slurry, the hourly compressive strength of the slurry stone body was measured. The experimental results are shown in Table 5.

[0045] Early compressive strength table of grout Table 5

[0046]

[0047]It can be seen from Table 5 that the early strength of the slurry is significantly improved, and the compressive strength of the stone body can reach 0.2MPa in 6 hours, and the compressive strength can reach more than 3.5MPa in 12 hours.

[0048] The ex...

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Abstract

The invention discloses early strength cement grout with low dehydration ratio for grouting. The stable early strength cement grout for pre-grouting of coal mineshaft surface comprises the following components in part by weight: 100 parts of silicate cement, 80-120 parts of water, 10-40 parts of suspending agent, 1 part of inorganic sodium salt and 0.03-0.1 part of organic alcohol early strength agent. The cement grout utilizes physical and chemical functions of composite admixture, improves the suspending stability of the cement grout and the early compression strength of a concretion body, improves the flow deformation feature and the movable shearing force of the grout and realizes controllable grout diffusion distance.

Description

Technical field: [0001] The invention relates to a cement slurry used in the technical field of pre-grouting on the ground of coal well shafts, in particular to a low water-separation rate early-strength cement slurry for grouting, which is suitable for grouting reinforcement and plugging of bedrock weathering zones and fault zones water. Background technique: [0002] In coal mine shaft ground pre-grouting engineering, bedrock weathering zone and fault fracture zone need grouting reinforcement and water plugging to improve their engineering geology and hydrogeological conditions, and prevent slabs and collapse accidents during sinking. Cement-based grout has good reinforcement performance, so cement grout has been used as the grouting material for bedrock weathering zones and fault fracture zones in ground pre-grouting projects. At present, the grouting depth of most coal shafts has reached 1,000 meters. In order to ensure the pumpability and injectability of the grout, ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B24/12C04B103/12
Inventor 徐润袁东锋郑军宋雪飞王正胜吴莹籍晓龙
Owner BEIJING CHINA COAL MINE ENG CO LTD
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