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Anchoring cement

A cement and anchoring technology, applied in the field of cement building materials, can solve the problems of poor resistance to double salt erosion, affecting the anchoring effect and durability, and unstable quality. Effect

Inactive Publication Date: 2006-01-11
GANSU BUILDING MATERIALS DESIGN & RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor resistance to sulfate and double salt erosion, it affects the anchoring effect and durability, resulting in unstable quality and other shortcomings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1, a kind of anchoring cement is mixed by 81% aluminate ferrite cement clinker, 7% limestone, 6% anhydrite, 5% calcium chloride, 1% hydroxymethyl cellulose, and passed through a ball mill A compound cement made by grinding.

[0020] (1) Coagulation time

[0021] The test equipment adopts the instruments and appliances specified in GB1346 "Cement Standard Consistency Water Consumption, Setting Time, Stability Test Method".

[0022] Pour 300g of anchoring cement into the mixing pot, add 90g of tap water, stir quickly and evenly, and immediately put it into the round mold, vibrate several times to scrape off the excess thick slurry, and after drying, measure the initial setting time as 1min and the final setting time as 2min ;

[0023] (2) Compressive strength

[0024] Referring to the test method of MT219-90 "Cement Anchor Roll Type Anchoring Agent", pour 2000g of anchoring cement into the mixing pot, add 600g of water, stir rapidly, and immediately pour 4×4×16...

Embodiment 2

[0029] Example 2, a kind of anchoring cement is mixed by 72% aluminate ferrite cement clinker, 10% limestone, 10% anhydrite, 3% calcium chloride, 5% hydroxymethyl cellulose, and passed through a ball mill Grinding.

[0030] Its test method, instrument and utensil are the same with embodiment 1.

[0031] Tested out:

[0032] (1) The initial setting time is 4 minutes, and the final setting time is 8 minutes.

[0033] (2) The compressive strength is 10.2MPa in 0.5 hours and 18.8MPa in 1 hour.

[0034] (3) The anchoring force is 74KN

[0035] (4) The expansion rate is 0.029% in 0.5 hours and 0.041% in 1 hour.

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Abstract

The invention discloses an anchoring cement, which is prepared from ferrum aluminates as principal raw material as well as lime stone, anhydrous gypsum, calcium chloride as hydrating promoter, methylcellulose propylene glycol ether as organic polymer through grinding by a ball mill. The invention solves the problem of weak resistance to abrasion of the present supporting materials.

Description

technical field [0001] The invention belongs to a cement building material. technical background [0002] Railways, highways, tunnels, mine well foundations and underground engineering are complex, especially in mine tunnels. Due to the mining depth and complex geological structure, the existing support materials have poor corrosion resistance, and the support strength gradually decreases, posing hidden dangers of accidents. In order to protect the lives of miners and the safety of national property, it is very necessary to develop and promote the supporting technology of bolt support, and the development of high-strength bolt support materials is the key point in the development and application of supporting technology of bolt support. [0003] High-strength bolt support materials mainly include mining steel strips, bolts, anchoring cement, etc. At present, the anchoring cement used by users is mainly composed of ordinary Portland cement mixed with various admixtures. Dur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/32C04B22/08C04B24/38
Inventor 宋旭辉曹万智
Owner GANSU BUILDING MATERIALS DESIGN & RES INST CO LTD
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