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Shield muck unfired hollow brick and preparation method thereof

A hollow brick and shield slag technology is applied in the field of shield slag-free burning hollow bricks and their preparation, which can solve the problems of unsuitable shield slag and difficulty in breaking shield slag, and achieve sustainable utilization and conservation of resources. The effect of cost and high economic efficiency

Active Publication Date: 2021-01-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, one of the objects of the present invention is to provide a shield dregs burn-free hollow brick and its preparation method, to solve the difficulty of shield dregs crushing and shield dregs containing part of the improver which makes the shield dregs unsuitable As a base material for non-fired hollow bricks

Method used

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  • Shield muck unfired hollow brick and preparation method thereof
  • Shield muck unfired hollow brick and preparation method thereof
  • Shield muck unfired hollow brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The weight ratio is 40 parts of shield muck, 10 parts of construction waste, 20 parts of machine-made sand, 5 parts of fly ash, 15 parts of cement, 4 parts of quicklime, 5 parts of soil curing agent, and sodium lignosulfonate for water reduction. 2 parts of agent, 3 parts of water glass, 2 parts of activator, 1 part of magnesium oxide, 2 parts of polysiloxane defoamer, 0.5 part of sodium hydroxide, 4 parts of talcum powder and 13 parts of water, according to the free The preparation plan of fired hollow bricks is to make unfired hollow bricks. After 28 days of curing according to the ratio, the unfired hollow bricks are tested for compressive strength, softening coefficient, and relative moisture content.

[0055] The natural moisture content of the shield muck soil sample was tested to be 40%, which is slightly higher than the liquid limit, and the soil is relatively moist. The plasticity index is 17.6, and the liquidity index is 0.86. Judging from the plastic state in...

Embodiment 2

[0060] Different from Example 1, the distribution ratio (weight ratio) of each component is: 50 parts of shield muck, 10 parts of construction waste, 20 parts of machine-made sand, 5 parts of fly ash, 12 parts of cement, 3 parts of quicklime, soil 4 parts of curing agent, 2 parts of polysiloxane defoamer, 0.5 parts of sodium hydroxide, 3 parts of talcum powder, 2 parts of sodium lignosulfonate water reducer, 2 parts of water glass, 2 parts of activator, magnesium oxide 0.5 parts, 13 parts of water.

[0061] After testing, the average compressive strength of the prepared shield slag unfired hollow brick is 11.2MPa, the strength after soaking in water for four days is 9.6MPa, the softening coefficient is 0.86, and the relative moisture content is 29.3%.

Embodiment 3

[0063] Different from Example 1, the distribution ratio (weight ratio) of each component is: 60 parts of shield muck, 20 parts of construction waste, 10 parts of machine-made sand, 10 parts of fly ash, 10 parts of cement, 3 parts of quicklime, soil 3 parts of curing agent, 1 part of polysiloxane defoamer, 0.5 parts of sodium hydroxide, 4 parts of talcum powder, 2 parts of sodium lignosulfonate water reducer, 4 parts of water glass, 2 parts of activator, magnesium oxide 1 part, 15 parts water.

[0064] According to the test, the average compressive strength of the prepared shield slag unfired hollow brick is 7.2MPa, the strength after soaking in water for four days is 5.8MPa, the softening coefficient is 0.81, and the relative moisture content is 34.9%.

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Abstract

The invention discloses a shield muck unfired hollow brick preparation method, which comprises: adding quick lime, magnesium oxide and a soil curing agent to shield muck, and carrying out a curing treatment to obtain first-stage muck; adding sodium hydroxide, talcum powder and a polysiloxane defoaming agent into the solidified muck, so that influence of an improver in the shield muck is eliminated, active substances in the shield muck are excited, and second-stage muck is obtained; adding water into the crushed two-stage muck and construction waste together with machine-made sand, fly ash, cement, water glass, an activating agent and a water reducing agent, and mixing to obtain a mixture; and pressing and maintaining the mixture to obtain the unfired hollow brick. The strength of the prepared unfired hollow brick can be close to the MU15 level, the softening coefficient is 0.78-0.92, the water absorption rate is 15% or below, the relative water content can reach 25% or below, the standard requirements of building bricks are met, the problem of shield muck discharge is solved, secondary pollution is avoided in the production process, and the unfired hollow brick can be efficiently produced in batches in a quality guaranteeing mode through cooperation of optimal production line equipment.

Description

technical field [0001] The invention relates to the field of treatment of shield dregs, in particular to a shield dregs burning-free hollow brick and a preparation method thereof Background technique [0002] As the main construction method of subway construction, the shield tunneling method has many problems, such as high cost of shield tunneling muck, easy to cause pollution, and potential safety hazards in muck stacking. Because the shield muck contains more secondary clay minerals, etc., it can be used to make clay non-fired hollow bricks by adding a certain amount of consolidation agent, so as to realize the recycling of resources. The patent with the application number CN201911021709.9 discloses an environment-friendly non-fired hollow brick and its preparation method for clay layer shield improved dregs, which solves the problem of shield improved muck treatment and reduces environmental pollution and land occupation. However, the patent provides The addition of defo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C04B18/16B28B3/00C04B111/40
CPCB28B3/00C04B18/16C04B28/26C04B2111/40C04B2201/50C04B14/06C04B18/08C04B7/02C04B2103/0068C04B24/18C04B22/064C04B14/042C04B22/062C04B22/066C04B24/42C04B22/002Y02W30/91
Inventor 王树英占永杰付循伟令凡琳王海波冯志耀
Owner CENT SOUTH UNIV
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