A self-healing cement-based material loaded with plant fibers and microorganisms

Abstract

The invention discloses a plant-fiber-loading-microbe self-repairing cement-based material. The plant-fiber-loading-microbe self-repairing cement-based material is prepared from a bacillus alcalophilus pasteurii bacterial solution, plant fibers and a nutrient solution, wherein the nutrient solution is prepared from maltodextrin, cottonseed cake meal, yeast extract powder and sodium citrate. The plant-fiber-loading-microbe self-repairing cement-based material disclosed by the invention has the following advantages that microbes can be preserved in a cement matrix for a long time in a high survival rate manner, so that the cement matrix can achieve life-time self-repairing in time of service; the adding of plants does not affect mechanical properties of concrete and can enhance the pull resistance and toughness of the concrete; the plants can release the microbes in time when cracks are generated; and the natural plants are wide in source, and the required plants do not need special complicated process treatment, so that the cost is low, and the plant-fiber-loading-microbe self-repairing cement-based material has environment-friendliness and economical efficiency.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a self-repairing cement-based material loaded with plant fibers and microorganisms. Background technique [0002] In 1925, Abrams first discovered that cement-based materials have a weak self-healing phenomenon. In the past 100 years, countless experts and scholars have proposed a variety of methods to promote the self-healing of cracks in cement-based materials. Jonkers et al. have used inorganic porous materials as microbial carriers. Such materials, such as expansive clay particles and ceramsite sand, often have a rich interconnected pore structure, which creates the material and energy exchange environment required for microbial growth and metabolism. The surface is relatively The dense structure can also protect microorganisms from the high-alkaline environment of concrete; De Belie of Ghent University and others have also used inorganic porous materials-diatomite as a bac...

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Problems solved by technology

[0004] 1. Directly place microorganisms in the concrete environment. It is difficult for microorganisms to survive for too long in a strong alkaline environment, and it is difficult to realize the lifetime self-repair of concrete during its service period

[0005] 2. The compatibility between the carrier and the cement-based material, and the implantation of other materials inside the cement-based material may affect its integrity and durability

[0006] 3. Larger carriers such as glass tubes, capsules, etc., after the internal repair agent flows out, the pores generated by the carrier itself cause matrix defects, which may affect its mechanical properties such as compression resistance and impermeability

[0007] 4. Due to the complicated manufacturing process and high cost of capsule materials, it is difficult to realize the universal application in general engineering, and the actual product has not been applied so far

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