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Low-shrinkage early-strength type mine filling cementing material

A technology for mine filling and cementitious materials, applied in the field of mine filling, can solve the problems of easy settling time, shrinkage and cracking, and achieve the effects of low cost, prevention of dry shrinkage and reduction of cracking.

Inactive Publication Date: 2017-05-31
北京华德创业环保设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The present invention overcomes the problems that the slag-based alkali-activated material is easy to sink and crack and has a long setting time under the condition of low-concentration slurry filling, and improves the strength of the filling body

Method used

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  • Low-shrinkage early-strength type mine filling cementing material
  • Low-shrinkage early-strength type mine filling cementing material

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Experimental program
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Effect test

Embodiment 1

[0011] The composition and ratio are 66.5% slag powder, 10% Portland cement, 6% aluminate cement, 10% fly ash, 5% gypsum, 2% sodium metasilicate and 0.5% polypropylene with a length of 4mm The fibers are evenly mixed to prepare the slag-based alkali excitation material. When the concentration of tailing sand (the tailing sand is relatively fine) is 60%, the material with different lime-sand ratios (1:6, 1:12) is evenly mixed with the tailing sand. Check the physical properties of the material. The table below shows the comparison between the slurry prepared with this material and the slurry prepared with cement.

[0012]

Embodiment 2

[0014] The composition and ratio are 64% slag powder, 10% Portland cement, 5% silica fume, 5% gypsum, 10% quicklime and 6% expansion agent, and are evenly mixed to prepare the slag-based alkali excitation material. When the tailings concentration is 70%, the material with different lime-sand ratios (1:10, 1:15) is mixed evenly with the tailings. Check the physical properties of the material. The table below shows the comparison between the slurry prepared with this material and the slurry prepared with cement.

[0015]

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Abstract

The invention relates to a low-shrinkage early-strength type mine filling cementing material. The cementing material comprises the following components in percentage by weight: 50-90% of slag powder, 5-25% of cement or cement clinker, 1-30% of mineral additive, 0-10% of gypsum, 0.5-10% of alkali activator and 0.1-10% of shrinkage-reducing and cracking-resistant material. The invention solves the problem that fillers are prone to high shrinkage, cracking, slow setting and low strength when a slag-based alkali activation material is used for full tailing filling of a mine and the concentration of filling slurry is low especially in case of improper curing. The material is used instead of cement for mine filling, has favorable adaptability for tailings of different concentrations (55-80%), and has the advantages of fast filler setting, high strength and low shrinkage.

Description

technical field [0001] The invention relates to a slag-based alkali-activated gelling material, which is mainly used in the field of mine filling. Background technique [0002] In the mining process, the cemented filling mining method is currently the most commonly used and most respected method. The slag-based alkali-activated material is used as a cementitious material in mine filling. It has a wide range of raw material sources and a large quantity. It has a large tolerance to the fine particles in the tailings, high strength, and the slurry does not segregate and stratify under a certain concentration. And the small amount of water has become the preferred choice for many mining units to choose filling cementitious materials. However, the slag-based alkali-activated material shrinks more than Portland cement. When the slurry concentration is low, especially in the case of improper maintenance, it is easy to cause large shrinkage, cracking and slow coagulation of the fi...

Claims

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Application Information

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IPC IPC(8): C04B7/21C04B28/08C04B18/12
CPCC04B7/21C04B28/08C04B2111/00724C04B2201/50C04B18/12Y02P40/10Y02W30/91
Inventor 王悦
Owner 北京华德创业环保设备有限公司
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