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Method for concreting loose sand particles through biological phosphate/carbonate composite cementing material

A technology of composite cementitious materials and phosphate, which is applied in the field of foundation reinforcement, bio-phosphate and carbonate composite cementitious materials to consolidate loose sand particles, and can solve the problems of large capital investment, unfavorable large-scale application, environmental damage, etc. problems, to achieve the effect of small investment, avoid waste of resources, and less pollution

Active Publication Date: 2015-03-25
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because MICP will release a large amount of ammonia gas and form an ammonium ion solution during the cementation process, which will damage the environment, and it needs to be treated in actual engineering, so it needs a lot of capital investment, which is not conducive to large-scale application

Method used

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  • Method for concreting loose sand particles through biological phosphate/carbonate composite cementing material
  • Method for concreting loose sand particles through biological phosphate/carbonate composite cementing material
  • Method for concreting loose sand particles through biological phosphate/carbonate composite cementing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, 1 mol K 2 HPO 4 The solid was completely dissolved in the pasteurized bacteria liquid (1 L) to obtain a phosphate bacteria liquid. Prepare 1L (1mol / l) urea and (2mol / l) magnesium chloride mixed solution. Pumping cemented high 6cm diameter 3cm quartz sand column (medium sand: 0.15-3.0, 90% fine sand: <0.15, 10%). First, 25ml of phosphate bacteria solution was pumped and injected into the sand column at 8ml / min, then 25ml of urea and magnesium chloride mixed solution was pumped and injected into the sand column at 6min / ml, and then 25ml of phosphate bacteria solution was injected into the sand column. After standing at 30°C for 1.5h, inject 25ml of mixed solution of urea and magnesium chloride into the sand column; then inject 25ml of phosphate bacteria solution into the sand column, after standing at 30°C for 1.5h, and so on, until it cannot be injected until the sand column. The belt mold was placed in an oven at 45°C for 14 days, and after the mold was remov...

Embodiment 2

[0029] First, 1 mol K 2 HPO 4 The solid was completely dissolved in the pasteurized bacteria liquid (1 L) to obtain a phosphate bacteria liquid. Prepare 1L (1mol / l) urea and (2mol / l) magnesium chloride mixed solution. Pumping cemented high 6cm diameter 3cm quartz sand column (medium sand: 0.15-3.0, 90% fine sand: <0.15, 10%). First, 25ml of phosphate bacteria solution was pumped and injected into the sand column at 10ml / min, and then 25ml of urea and magnesium chloride mixed solution was pumped and injected into the sand column at 8min / ml, and then 25ml of phosphate bacteria solution was injected into the sand column. After standing at 30°C for 2 hours, inject 25ml of mixed solution of urea and magnesium chloride into the sand column; then inject 25ml of phosphate bacteria solution into the sand column, after standing at 30°C for 2 hours, and so on, until the sand column cannot be injected until. The belt mold was placed in an oven at 45°C for 14 days, and after the mold w...

Embodiment 3

[0031] Configuration 1 first converts 1 mol K 2 HPO 4The solid was completely dissolved in the pasteurized bacteria liquid (1 L) to obtain a phosphate bacteria liquid. Prepare 1L (1mol / l) urea and (2mol / l) magnesium chloride mixed solution. Pumping cemented high 6cm diameter 3cm quartz sand column (medium sand: 0.15-3.0, 90% fine sand: <0.15, 10%). First, 25ml of phosphate bacteria solution was pumped and injected into the sand column at 16ml / min, then 25ml of urea and magnesium chloride mixed solution was pumped and injected into the sand column for 10min / ml, and then 25ml of phosphate bacteria solution was injected into the sand column. After standing at 30°C for 2 hours, inject 25ml of mixed solution of urea and magnesium chloride into the sand column; then inject 25ml of phosphate bacteria solution into the sand column, after standing at 30°C for 2 hours, and so on, until the sand column cannot be injected until. The belt mold was placed in an oven at 45°C for 10 days,...

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Abstract

The invention discloses a method for concreting loose sand particles through a biological phosphate / carbonate composite cementing material. The method comprises the following steps: inoculating the second to third-generation Bacillus pasteurii strains into a soy peptone and casein peptone culture medium, thereby obtaining the third to fourth-generation Bacillus pasteurii bacterium solution; completely dissolving K2HPO4 solids in the Bacillus pasteurii bacterium solution, thereby forming phosphate bacterium solution; preparing a mixed solution of 1mol / l of urea and 2mol / l of anhydrous MgCl2; preparing two grades of quartz sand of which the particle sizes are 150microns or below and 150-300 microns respectively according to a Fuller closest packing method, and filing the quartz sand in a mold provided with a buffer pad and filter sand; respectively injecting the phosphate bacterium solution and the mixed solution into the prepared quartz sand mold according to a volume ratio of 1:1 by virtue of a peristaltic pump until the phosphate bacterium solution and the mixed solution cannot be injected; and maintaining the sample and the mold in a drying oven together for 10-15 days, performing form stripping, thereby obtaining corresponding quartz sand columns.

Description

technical field [0001] The invention relates to a method for consolidating loose sand particles with biological phosphate and carbonate composite cementitious materials, belonging to the technical category of foundation reinforcement. Background technique [0002] Portland cement is the most commonly used cementitious material in the construction field, and it is also an important part of the building materials industry. The main component of cement is limestone containing a large amount of calcium carbonate. During the production process, fossil fuels are consumed to heat the limestone. During the heating process, the limestone decomposes and releases the greenhouse gas carbon dioxide (CO 2 ). Therefore, both fuel combustion and carbonate decomposition release CO 2 . According to Pang Cuijuan's report, producing 1 ton of cement clinker requires a comprehensive energy consumption of about 113.5 kgce and emits about 0.8 tons of CO 2 gas, if atmospheric CO 2 If the concen...

Claims

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Application Information

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IPC IPC(8): C04B28/34C04B12/02
CPCC04B28/34
Inventor 钱春香於孝牛薛彬王欣
Owner SOUTHEAST UNIV
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