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Quick-setting early strength cement slurry for ground pregrouting reinforcement

A cement slurry and pre-grouting technology, applied in the field of cement slurry, can solve the problems of slow viscosity growth, poor water dilution resistance, long cement slurry setting time, etc., achieve fast viscosity growth, strong water dilution resistance, and improve injection The effect of the slurry effect

Inactive Publication Date: 2012-10-31
BEIJING CHINA COAL MINE ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of long setting time of cement slurry, slow viscosity growth and poor water dilution resistance, the invention provides a cement slurry suitable for grouting reinforcement of broken zones and weak interlayers

Method used

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  • Quick-setting early strength cement slurry for ground pregrouting reinforcement
  • Quick-setting early strength cement slurry for ground pregrouting reinforcement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The quick-setting early-strength cement slurry for coal mine grouting reinforcement in this embodiment is composed of the following components: PO.4.25 ordinary portland cement 100kg, water 100kg, sodium silicate 5kg, sodium bicarbonate 1kg, triethanolamine hydrochloride 0.1 kg.

[0016] The initial setting time of the cement slurry in this embodiment is 5.2h, and the final setting time is 6.4h.

[0017] The early compressive strength of the slurry was measured and is 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 0.2MPa in 7h, and the compressive strength can reach more than 3.3MPa in 12h.

[0021] Weak interlayers and fractured zones often develop layer fissures and large structural fissures, are rich in water and have fast groundwater flow, so the ability of the grout to re...

Embodiment 2

[0027] The quick-setting early-strength cement slurry for coal grouting reinforcement in this embodiment is composed of the following components: PO.42.5 ordinary Portland cement 100kg, water 150kg, sodium silicate 10kg, sodium bicarbonate 1kg, triethanolamine hydrochloride 0.1 kg.

[0028] The initial setting time of the cement slurry in this embodiment is 5.6h, and the final setting time is 6.9h.

[0029] The early compressive strength of the slurry was measured and is shown in Table 3.

[0030] Early compressive strength of grout Table 3

[0031]

[0032] 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 0.27MPa in 8 hours, and the compressive strength can reach more than 2.5MPa in 12 hours.

[0033] The initial funnel viscosity of the slurry is 32s, and the fluidity is good. The time-varying properties of slurry viscosity were systematically tested, and the test result...

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Abstract

The invention discloses quick-setting early strength cement slurry for ground pregrouting reinforcement. The quick-setting early strength cement slurry for the ground pregrouting reinforcement of a coal mine shaft comprises the following components based on portion by weight: 100 portions of silicate cement, 100-150 portions of water, 5-10 portions of quick-setting additive, 1 portion of inorganic salt early strength admixture and 0.1 portion of organic amine salt early strength admixture. The quick-setting early strength cement slurry has the advantages of low initial viscosity, good fluidity, quick viscosity increment of the cement slurry, strong capability of resisting water dilution, short setting time and high strength of early aggregated masses.

Description

Technical field: [0001] The invention relates to a cement slurry used in the technical field of coal mine shaft ground pre-grouting, in particular to a quick-setting early-strength cement slurry for coal grouting reinforcement, which is suitable for grouting reinforcement of weathered zones, weak interlayers and broken rock formations. Background technique: [0002] The ground pre-grouting of coal mine shaft is used for drilling and grouting around the shaft before the shaft is excavated. Coal-measure strata have obvious layered rock mass structure characteristics, and these layered rock masses usually have an interbedded structure of soft and hard layers. In tectonic stress concentration areas, common hard rock formations such as limestone and quartz sandstone and other brittle formations are often partially broken; soft rock formations such as clay rock and other plastic formations often have layer-cutting fissures that cut through them, with strong water-richness and low ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467
Inventor 徐润袁东锋郑军宋雪飞王正胜籍晓龙
Owner BEIJING CHINA COAL MINE ENG CO LTD