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Self-repairing cement-based material based on microorganisms loaded on artificial functional carrier and preparation method of self-repairing cement-based material

A technology of cement-based materials and microorganisms, applied in the field of building materials, can solve the problems that the contribution of carrier crack self-repair is not fully utilized, the performance of concrete strength is negatively affected, and the scope of use of concrete is limited, so as to achieve good crack self-repair ability, Conducive to long-term maintenance and strength-enhancing effects

Active Publication Date: 2021-04-09
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while these carriers protect microorganisms, they have a negative impact on concrete strength and other properties, which limits the scope of use of concrete
In addition, the microbial carrier used in the existing microbial self-healing cement-based materials has a single function, most of the carriers only have the function of protecting microorganisms, and the contribution of the carrier itself to the self-healing of cracks has not been fully utilized

Method used

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  • Self-repairing cement-based material based on microorganisms loaded on artificial functional carrier and preparation method of self-repairing cement-based material
  • Self-repairing cement-based material based on microorganisms loaded on artificial functional carrier and preparation method of self-repairing cement-based material
  • Self-repairing cement-based material based on microorganisms loaded on artificial functional carrier and preparation method of self-repairing cement-based material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The self-healing cement-based material loaded with microorganisms on an artificial functional carrier is made of the following raw materials in parts by weight:

[0033] 450 parts of cement, 95 parts of artificial functional carrier loaded with microorganisms, 1233 parts of sand, 4.5 parts of calcium lactate, 4.5 parts of urea, and 225 parts of water.

[0034] The specific preparation method of the artificial functional carrier loaded with microorganisms is as follows:

[0035] (1) Inoculate the activated urease-producing microorganism into a liquid medium for constant temperature shaking culture to obtain a bacterial liquid, centrifuge the bacterial liquid at 8000r / min for 10 minutes to obtain a bacterial sludge, wash the bacterial sludge with distilled water, and obtain a bacterial The body suspension concentration is 3×10 9 cfu / ml, evenly spray 30ml of bacterial cell suspension onto 155g of calcium carbonate powder, dry and grind at 40°C to obtain bacteria-carrying ...

Embodiment 2

[0042] The self-healing cement-based material loaded with microorganisms on an artificial functional carrier is made of the following raw materials in parts by weight:

[0043]450 parts of cement, 190 parts of artificial functional carrier loaded with microorganisms, 1117 parts of sand, 4.5 parts of calcium lactate, 4.5 parts of urea, and 225 parts of water.

[0044] The specific preparation method of the artificial functional carrier loaded with microorganisms is the same as that in Example 1.

[0045] The preparation method of the self-healing cement-based material loaded with microorganisms based on the artificial functional carrier is the same as that in Example 1.

[0046] The prepared self-healing cement-based material was prefabricated with cracks with a width of about 0.4 mm by splitting with a press, and repaired by hydroponics for 28 days to evaluate the self-healing effect of cracks.

[0047] figure 2 is the crack self-healing effect of the prepared self-healing ...

Embodiment 3

[0049] The self-healing cement-based material loaded with microorganisms on an artificial functional carrier is made of the following raw materials in parts by weight:

[0050] 450 parts of cement, 380 parts of artificial functional carrier loaded with microorganisms, 881 parts of sand, 4.5 parts of calcium lactate, 4.5 parts of urea, and 225 parts of water.

[0051] The specific preparation method of the artificial functional carrier loaded with microorganisms is the same as that in Example 1.

[0052] The preparation method of the self-healing cement-based material loaded with microorganisms based on the artificial functional carrier is the same as that in Example 1.

[0053] The compressive strength of the prepared self-healing cement-based materials was tested. The compressive strength of the self-repairing cement-based material prepared by embodiment 1, embodiment 2, embodiment 3 is compared with the reference group, and the results are as follows image 3 shown. The c...

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Abstract

The invention discloses a self-repairing cement-based material based on microorganisms loaded on an artificial functional carrier and a preparation method of the self-repairing cement-based material. The self-repairing cement-based material is prepared from the following raw materials in parts by weight: 360 to 500 parts of cement, 95 to 380 parts of the microorganism-loaded artificial functional carrier in the claim 7, 3 to 15 parts of urea, 3 to 15 parts of calcium lactate, 800 to 1500 parts of sand and 180 to 300 parts of water. The self-repairing cement-based material based on the microorganisms loaded on the artificial functional carrier has good crack self-repairing capacity, when the cement-based material cracks, the pre-buried artificial functional carrier loaded with the microorganisms can trigger a series of biochemical reactions to generate more repairing products such as calcium carbonate and CSH gel, and meanwhile, the added microorganism-loaded artificial functional carrier has less influence on the strength of the cement-based material, so that the durability of the cement-based material is effectively improved.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a self-repairing cement-based material, in particular to a self-repairing cement-based material based on an artificial functional carrier loaded with microorganisms and a preparation method thereof. Background technique [0002] Concrete has become the most widely used civil engineering material due to its excellent properties such as high compressive strength, good durability, convenient material acquisition, and low price. However, due to the low tensile strength of concrete, it is prone to cracking due to factors such as load, shrinkage, temperature deformation, and uneven settlement, which affects the structural strength and durability of concrete. [0003] For concrete crack repair, traditional repair methods mainly include surface repair method, pressure grouting method, structural reinforcement method and concrete replacement method. These traditional maintenance methods o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/28C04B28/00
CPCC04B40/0039C04B28/00C04B2111/343C04B2103/0001C04B18/141C04B14/28C04B22/10C04B24/14C04B22/142C04B24/281C04B24/305C04B24/126C04B24/04C04B14/06
Inventor 罗勉白镜泉荆康李旭刘野冯家亮
Owner YANGZHOU UNIV