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Self-healing concrete and preparation method thereof

A concrete and self-healing technology, applied in the field of bio-concrete materials, can solve the problems of high cost of pre-embedded shape memory alloys, high addition of active substances, consumption of active substances, etc., achieve great research value and application potential, and high porosity , the effect of preventing death

Inactive Publication Date: 2021-01-15
NANJING UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

Although the above methods can achieve self-repair of concrete cracks to a certain extent, these methods also have obvious deficiencies: 1. Mineral self-repair method has limited repair amount and low repair efficiency; 2. Fiber-reinforced cement-based composite Although the material has higher potential self-healing performance than ordinary concrete, it is still affected by age, environmental media, temperature and humidity, and admixtures, etc., which takes a long time and the effect is not obvious; The addition of active substances has higher requirements
4. The cost of embedded shape memory alloy is too high, which limits its application in construction engineering

Method used

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  • Self-healing concrete and preparation method thereof

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preparation example Construction

[0026] A preparation method of self-healing concrete, the specific steps are as follows:

[0027] Step 1, select Bacillus pasteurii (Sporosarcina pasteurii, ATCC11859) with mineralization and precipitation function as the lyophilized powder of the thallus, and the thallus should be activated according to the microbial culture method before use;

[0028] Step 2, using the vacuum impregnation method, the mineralized microorganism ATCC11859 Bacillus pasteurianum solution and calcium lactate are adsorbed on the surface and internal pores of the ceramsite particles under negative pressure, dried, and the yeast extract solution is sprayed on the surface of the ceramsite. After completion, it is dried to obtain ceramsite loaded with bacteria and calcium lactate;

[0029] Step 3, evenly spraying a slurry formed by mixing metakaolin, sodium silicate and water on the surface of the ceramsite immobilized with bacteria and calcium lactate, and drying to obtain self-repairing particles;

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Embodiment 1

[0038] Step 1: The microorganism ATCC11859 Bacillus pasteurianus used in the test was inoculated and cultured according to the routine method of aerobic microorganisms, and the bacillus was cultured in a large amount using a liquid medium. The composition of the medium used was as follows: ultrapure water 1L, peptone 5g , beef extract 3g, sodium carbonate 0.53g, sodium bicarbonate 0.42g, agar powder 18g. Bacillus pasteuriani is an aerobic bacterium, which requires oxygen intake during the growth process. Inoculate the bacteria into a conical flask with a liquid volume of 150mL on the ultra-clean bench, place it in a constant temperature shaker, and The temperature of the shaker was 30° C., and the shaking frequency was 120 r / min, and the culture was carried out at a constant temperature for 24 hours to obtain a bacterial liquid containing Bacillus thallus and spores. Dilute the obtained bacterial liquid with distilled water to an OD600 value of 0.40, and then proceed to the ne...

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Abstract

The invention discloses self-healing concrete and a preparation method thereof. The preparation method comprises the following steps: firstly immobilizing microorganisms and required nutrient substances on ceramsite in a soaking manner, then uniformly mixing the ceramsite with mineral materials such as cement, and performing pouring to form concrete. In a proper maintenance environment, microorganisms generate calcium carbonate to bond sand and the like into a whole, so that pores or cracks are filled, crack repair is finally realized, and the impermeability and durability of the structure areensured. Ceramsite is used as a carrier, so that on one hand, the living environment of bacteria can be improved, death caused by a high-alkali environment in concrete is prevented, and the remediation efficiency is improved; and on the other hand, the ceramsite is used as a light porous material, has the effects of heat preservation and heat insulation, and has great research value and application potential.

Description

technical field [0001] The invention belongs to the field of biological concrete materials, and relates to a self-healing concrete and a preparation method thereof. Background technique [0002] Concrete has such high compressive strength, durability, and low cost that it is currently the most widely used building material. However, as a multi-phase heterogeneous material, concrete has disadvantages such as low tensile strength, high brittleness, and poor crack resistance. Therefore, it is easily affected by the surrounding complex environment during long-term use. Micro cracks are produced. After the cracks are generated, not only the strength of the concrete will decrease, but also water, oxygen, chloride and other corrosive substances in the environment will invade the interior of the concrete through the cracks, causing a series of problems such as leakage, carbonization, and corrosion of steel bars, reducing the concrete structure. durability. For example, cracks in ...

Claims

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Application Information

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IPC IPC(8): C04B20/12C04B18/02C04B28/00C04B111/72
CPCC04B18/027C04B20/12C04B28/00C04B2111/72C04B20/1022C04B20/10C04B20/1074
Inventor 孙溪晨冯君孙巍巍水维佳胡玮王娅玲单婷语丁鑫伟陈捷王发家徐鸿飞奕嘉琦陈思宇刘苗苗陈柄丞张威
Owner NANJING UNIV OF SCI & TECH
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