Pit backfill material, preparation method thereof and application method thereof

A mine pit and calcination technology, applied in the field of building materials, can solve the problems of unfavorable environmental protection and low-carbon economy development, low backfill construction efficiency, large material demand, etc., to improve self-compacting, pumpability, and water retention good effect

Active Publication Date: 2011-11-16
GUANGDONG REDWALL NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the backfilling of mine pits does not have high requirements on the performance of materials, the demand for materials is quite large
If the traditional materials such as cement mortar and cement soil are used for backfilling, the cement consumption will be huge, which is not only costly, but also not conducive to the development of environmental protection and low-carbon economy
Furthermore, due to the poor fluidity of traditional materials, the efficiency of backfill construction is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0072] The preparation method of mine pit backfill material of the present invention, the specific steps are: weigh each component according to the aforementioned weight ratio, add cement, calcined activated coal gangue, steel slag powder, polycarboxylate water reducer and modified starch ether into the mixer, After dry mixing evenly, add hydrated lime powder, phosphogypsum, expansion agent, glass quartz sand tailings and machine-made sand, and dry mix evenly. The obtained pit backfill material only needs to be added to the required proportion of tap water and stirred for 2 minutes at the construction site, parked for 5 minutes, stirred again for 1 minute, and then pumped for construction. The mortar made by adding water to the pit backfill material of the present invention not only has good fluidity, is easy to pump, but also has excellent water retention, good self-compacting and self-filling properties, and the compressive strength and bonding strength after hardening meet t...

Embodiment 1

[0087] A pit backfill material, in parts by weight, 52.5 grade ordinary portland cement 100, calcined activated coal gangue 200, steel slag powder 100, slaked lime powder 15, phosphogypsum 35, expansion agent 20, glass quartz sand tailings 50, Made of machine-made sand 4000, water reducing agent 1.5, modified starch ether 0.1. After adding water accounting for 35% of the product's weight and stirring evenly to form a mortar, its fluidity is 300mm, bleeding rate is 0, compressive strength is 2.2MPa, bonding strength is 0.7MPa, and expansion rate is 0.05% in 28 days. Can resist 100 times sulfate attack.

Embodiment 2

[0089] A mine pit backfill material, in parts by weight, 52.5 grade Portland cement 100, calcined activated coal gangue 400, steel slag powder 250, slaked lime powder 50, phosphogypsum 90, expansion agent 80, glass quartz sand tailings 150, mechanism Sand 14000, water reducer 3.5, modified starch ether 1.0. After adding water accounting for 47% of the product's weight and stirring evenly to form a mortar, its fluidity is 330mm, bleeding rate is 0, compressive strength is 1.6MPa, bonding strength is 0.5MPa, and expansion rate is 0.04% in 28 days. Can resist 200 times of sulfate attack.

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Abstract

The invention discloses a pit backfill material and an application method thereof. The pit backfill material comprises cement, calcined activated coal gangue, steel slag powder, lime hydrate powder, phosphogypsum, an expanding agent, glass quartz sand tailings, machine-made sand, a water reducer, and modified starch ether. The material can be constructed through pumping only by adding water with 35-90% of the total weight on a building site and stirring according to requirements. The pit backfill material which is prepared from a large amount of industrial solid wastes in the invention and allows workability, water retention, fluidity and self-compaction fallibility to be good, compressive strength to be high, bonding strength and sulphate erosion resistance to satisfy relevant requirements, and slight dilatability to be possessed has the advantages of simple production technology, convenient application, waste utilization, energy saving, consumption reduction, low carbon, and good market prospect.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a pit backfill material and a preparation and use method thereof. Background technique [0002] With the exploitation of oil, coal and various mineral resources in our country, the pits of hundreds of millions of cubic meters need to be backfilled. If the mine pit is not backfilled in time, it will bring about various natural disasters such as landslides, water seepage, and mudslides, endangering personal and property safety. However, although the backfilling of mine pits does not have high requirements on the performance of materials, the demand for materials is quite large. If traditional materials such as cement mortar and cement soil are used for backfilling, the cement consumption will be huge, which is not only costly, but also not conducive to environmental protection and the development of a low-carbon economy. Furthermore, due to the poor fluidit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/04C04B28/142Y02W30/91C04B14/06C04B14/365C04B18/142C04B22/008C04B22/064C04B24/38C04B40/0057C04B2103/302C04B7/02
Inventor 赵利华黄海燕翟冲
Owner GUANGDONG REDWALL NEW MATERIALS
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