Self-healing cement-based material containing bacterial spores and preparation method thereof

A technology of cement-based materials and bacterial spores is applied to concrete with self-healing function of cracks, self-healing cement-based materials and their preparation, mortar and similar building materials, and can solve the problem of limited self-healing ability and self-healing. Slow speed, inability to meet and other problems, to achieve the effect of reducing water penetration speed, strong resistance, and improving structural durability

Inactive Publication Date: 2014-06-25
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the self-healing ability of concrete itself is limited, limited to microcracks with a width of 0.1-0.2 mm, and the self-healing speed is slow, which cannot meet the requirements of practical engineering.

Method used

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  • Self-healing cement-based material containing bacterial spores and preparation method thereof
  • Self-healing cement-based material containing bacterial spores and preparation method thereof
  • Self-healing cement-based material containing bacterial spores and preparation method thereof

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preparation example Construction

[0017] The invention further discloses a preparation method of a self-healing cement-based material added with bacterial spores, comprising the following steps:

[0018] (1) Weigh the required cement, weigh and add calcium lactate in proportion, and stir until the calcium lactate is evenly distributed in the cement;

[0019] (2) Replace part of the mixing water with the spore suspension and shake the remaining required water together, then pour it into cement and calcium lactate, stir it evenly, and pour it into the mold for molding.

Embodiment 1

[0022] Embodiment 1: prepare two groups of test pieces by the test piece mixing ratio in table 1, water and cement mass ratio are 0.4, calcium lactate quality is 2% of cement quality, and proportioning 1 is benchmark group, does not add bacterial spore, will The weighed cement (P.O.42.5 cement), calcium lactate and water are mixed evenly and put into the mold; the proportion 2 is added with bacterial spores (108 spores are added to the cement-based material per cubic centimeter), and the weighed cement ( After P.O.42.5 cement) and calcium lactate are dry mixed evenly, replace part of the mixing water with the spore suspension and shake the remaining required water together, then pour it into the cement and calcium lactate, mix well and put it into the mold for molding. After forming, blow the surface of these two groups of test pieces with warm air immediately to make them produce plastic shrinkage cracks of 0.4-0.5mm. After 24 hours, measure the initial water seepage velocity ...

Embodiment 2

[0028] Embodiment 2: prepare two groups of test pieces by the test piece mixing ratio in table 3, water and cement mass ratio are 0.3, and calcium lactate quality is 3% of cement quality, and proportioning 1 is benchmark group, does not add bacterial spore, will The weighed cement (P.O.42.5 cement), calcium lactate and water are mixed evenly and then put into the mold; the ratio 2 is added with bacterial spores (3.3×10 per cubic centimeter of cement-based material) 7 spores), the weighed cement (P.O.42.5 cement) and calcium lactate are dry mixed evenly, and the spore suspension is replaced with part of the mixing water and the remaining water is shaken together, then poured into the cement and calcium lactate, and stirred. After uniformity, put it into the mould. After 24 hours of molding, demould, artificially create 0.4-0.5mm cracks on a three-point bending test machine, and then cure the cracked specimens in water, observe and record the self-healing conditions of cracks 7d...

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Abstract

The invention relates to a self-healing cement-based material containing bacterial spores and a preparation method thereof. The self-healing cement-based material consists of cement, water, calcium lactate and bacterial spores, wherein the mass ratio of the water to cement is 0.3-0.5, the mass of calcium lactate accounts for 1%- 5% of the mass of cement, 10<6>-10<9> spores are added into 1cm<3> of cement-based material. The preparation method comprises the steps of: inoculating alkali-resistant Bacillus, culturing to obtain strain solution having a high spore forming rate, heating the strain solution in a 80 DEG C water bath for 20min, centrifugally cleaning to obtain a spore suspension; weighing the required cement, proportionally weighing and adding calcium lactate, stirring until calcium lactate is evenly distributed in the cement; mixing the spores suspension which is used for replacing a part of mixing water with the rest water evenly in a shaking manner and pouring into the cement and calcium lactate, and stirring evenly, and pouring into a mold for forming.

Description

technical field [0001] The invention relates to a self-healing cement-based material added with bacterial spores and a preparation method thereof, belonging to the field of building materials, in particular to concrete, mortar and similar building materials with crack self-healing functions. Background technique [0002] Due to its high compressive strength and economical and practical characteristics, concrete has already become the most important building material today and for a long time to come. However, due to the insurmountable defects of high brittleness and low tensile strength in concrete, it is easy to produce cracks under the influence of the use process and the surrounding environment, which makes it easy for corrosive media such as sulfate and chloride to penetrate into the concrete. Inside the concrete, it will cause damage to the concrete itself and the pre-embedded steel bars, greatly shortening the service life of the concrete structure, causing huge econom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
Inventor 钱春香罗勉李瑞阳任立夫
Owner SOUTHEAST UNIV
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