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MICP (microbiologically induced calcium carbonate precipitation) cementing test device

A test device and microbial technology, which is applied in measurement devices, soil material testing, material inspection products, etc., can solve the problems of uneven spatial and temporal distribution of internal cementation substances, poor soil permeability, and poor cementation effect, and achieve accurate and reliable test data. , The effect of high bonding strength and simple structure

Inactive Publication Date: 2016-08-24
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the method of injecting the bacterial liquid from the bottom of the container to the top can solve the problem of bacterial liquid distribution, it does not match the actual experiment.
In addition, due to the uneven distribution of the bacterial solution during the grouting process, the internal cementing material is unevenly distributed in time and space after mineralization, and finally leads to poor cementation effect; for soil with low porosity, the permeability is poor and the cementation strength is low.
In summary, there are still some deficiencies in the current laboratory equipment for microbially induced calcium carbonate deposition.

Method used

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  • MICP (microbiologically induced calcium carbonate precipitation) cementing test device
  • MICP (microbiologically induced calcium carbonate precipitation) cementing test device

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Embodiment Construction

[0013] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0014] see Figure 1 ~ Figure 2 , a microorganism-induced calcium carbonate deposition cementation test device, comprising a sand column 5, an inlet 3 is provided in the center of the top of the sand column 5, and a geotechnical covering on the sample soil 9 is provided in the sand column 5 Cloth 7, a sand and gravel layer 6 is formed on the geotextile 7, a permeable plate 10 is fixedly connected to the lower end of the sand column 5, and an intermediate liquid storage column fixed to it is provided below the permeable plate 10 11. A liquid outlet 12 is provided at the bottom of the intermediate liquid storage column 11, and the liquid outlet 12 of the intermediate liquid storage column 11 is connected to the inlet of the peristaltic pump II1...

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Abstract

The invention discloses an MICP (microbiologically induced calcium carbonate precipitation) cementing test device. The MICP cementing test device comprises a sand column, wherein an inlet is formed in the top center of the sand column; geotextile covering a soil mass sample is arranged in the sand column; a sand gravel layer is formed on the geotextile; a porous plate is fixedly connected to the lower end of the sand column; a middle liquid storage column fixedly connected with the porous plate is arranged below the porous plate; a liquid outlet is formed in the bottom of the middle liquid storage column and is connected with an inlet of a peristaltic pump II through a pipeline, and an outlet of the peristaltic pump II is connected with a liquid containing vessel; a valve is arranged on the pipeline connecting the liquid outlet of the middle liquid storage column and the inlet of the peristaltic pump II; the inlet of the sand column is connected with an outlet of a peristaltic pump I, and an inlet of the peristaltic pump I is connected with a microbial slurry tank. A microbial liquid can infiltrate more uniformly, uniform space-time distribution of the microbial liquid in an infiltration process can be guaranteed, and the permeability in soil mass with low porosity is good, and the cementing strength is high.

Description

technical field [0001] The invention relates to a cementation test device, in particular to a cementation test device for microorganism-induced calcium carbonate deposition. Background technique [0002] The commonly used method for foundation treatment is to use artificial materials (cement, epoxy resin, sodium silicate, etc.) to inject them into the pores by grouting to achieve the effect of cementation. For the above chemical grouting, except for sodium silicate, the rest of the chemical grouts contain toxic substances to varying degrees, which will pollute the environment. In recent years, with the interdisciplinary research of biology, chemistry, mechanics, and materials science, a new technology—microbe-induced calcium carbonate deposition (MICP) has been studied. [0003] During the cementation test, if the bacterial solution is injected from the top to the bottom of the container, due to the influence of the side wall effect, most of the bacterial solution seeps thr...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N33/24
CPCG01N15/082G01N33/24G01N2015/0873
Inventor 唐阳练继建闫玥徐宏殷王昶力贺小青吴昊潼车振宁
Owner TIANJIN UNIV
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