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Hydrogel encapsulated bacterial spore self-repairing material with pH responsiveness and cement-based concrete self-repairing method

A technology of self-healing materials and bacterial spores, which is applied in the field of cement-based concrete self-repairing and hydrogel-encapsulated bacterial spore self-repairing materials, which can solve problems such as the influence of cement strength, the effect of cement self-healing results, and the destruction of bacterial spores

Active Publication Date: 2020-04-24
BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of microorganisms to self-heal cement faces two main difficulties: one is that great stress will be generated during the cement solidification process, which will cause damage to bacterial spores and affect the final self-healing result of cement; the other is to ensure the protection of bacterial spores. Resuscitating, it is necessary to add water-absorbing substances and nutrients to ensure the normal life activities of bacteria, but these additional additions often affect the strength of cement

Method used

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  • Hydrogel encapsulated bacterial spore self-repairing material with pH responsiveness and cement-based concrete self-repairing method
  • Hydrogel encapsulated bacterial spore self-repairing material with pH responsiveness and cement-based concrete self-repairing method
  • Hydrogel encapsulated bacterial spore self-repairing material with pH responsiveness and cement-based concrete self-repairing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] 1. Materials

[0067] The bacterial encapsulation materials used in this example are alginate, chitosan, calcium source and aluminum source. The calcium source is composed of calcium chloride and calcium nitrate in a molar ratio of 3:1. The aluminum source is composed of aluminum chloride and aluminum sulfate in a molar ratio of 5:1. The molar ratio of the calcium source (calcium ion) to the aluminum source (aluminum ion) is 6:1. Chitosan calcium alginate hydrogel was used to encapsulate bacterial spores and used for self-healing of cement. Under the condition of external aqueous solution infiltrated into cement cracks, the hydrogel expanded by absorbing water to stimulate the recovery of spores to achieve self-healing. The dosage of hydrogel is 3-5g / 100g cement, and the number of spores contained in each gram of dry hydrogel is 1.0×10 7 ~9.8×10 7 indivual.

[0068] 2. Preparation

[0069] Mix 50 mL of spores of Bacillus alkalophilus (3-7% (w / v), wet weight) with ...

Embodiment 2

[0076] 1. Materials

[0077] The bacterial encapsulation materials used in this example are alginate, polyvinylpyrrolidone and calcium source. The calcium source is composed of calcium chloride and calcium nitrate in a molar ratio of 3:1. The aluminum source is composed of aluminum chloride and aluminum sulfate in a molar ratio of 5:1. The molar ratio of the calcium source (calcium ion) to the aluminum source (aluminum ion) is 6:1. Polyvinylpyrrolidone calcium alginate hydrogel was used to encapsulate bacterial spores and used for self-healing of cement. Under the condition of external aqueous solution infiltrated into cement cracks, the hydrogel expanded by absorbing water to stimulate the recovery of spores to achieve self-healing. The dosage of hydrogel is 3-5g / 100g cement, and the number of spores contained in each gram of dry hydrogel is 1.0×10 7 ~9.8×10 7 indivual.

[0078] 2. Preparation

[0079] Mix 50ml of spores of Bacillus alkalophilus (3-7% (w / v), wet weight)...

Embodiment 3

[0084]1. Materials

[0085] The bacterial encapsulation materials used in this example are polyaspartate, chitosan and calcium source. The calcium source is composed of calcium lactate and calcium acetate in a molar ratio of 3:1. The aluminum source is aluminum chloride. The molar ratio of the calcium source (calcium ion) to the aluminum source (aluminum ion) is 6:1. Chitosan polycalcium aspartate hydrogel was used to encapsulate bacterial spores and used for cement self-healing. Under the condition of external aqueous solution infiltrated into cement cracks, the hydrogel expanded by absorbing water to stimulate the recovery of spores to achieve self-healing. The dosage of hydrogel is 3-5 / 100g cement, and the number of spores contained in each gram of dry hydrogel is 1.0×10 7 ~9.8×10 7 indivual.

[0086] 2. Preparation

[0087] Mix 50ml of alkalophilic Bacillus spores (3-7% (w / v), wet weight) with 350ml of 1.0-9.0% (w / v) polyaspartate solution, and stir evenly. Add the ...

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Abstract

The invention belongs to the field of interdiscipline of civil engineering materials and microbiology, and relates to a hydrogel encapsulated bacterial spore self-repairing material with pH responsiveness and a cement-based concrete self-repairing method. The self-repairing material comprises hydrogel with pH responsiveness, bacterial spores encapsulated by the hydrogel and a calcium source, wherein the hydrogel is prepared from a cross-linked hydrophilic polymer, and the bacterial spores comprise bacillus pseudofirmus spores. The hydrogel used in the invention has pH responsiveness, and can encapsulate bacterial spores on the premise of ensuring no damage to cement strength, thus successfully realizing cement self-healing.

Description

technical field [0001] The invention belongs to the interdisciplinary field of civil engineering materials and microbiology, and more specifically relates to a pH-responsive hydrogel-encapsulated bacterial spore self-repair material, and a cement-based concrete self-repair using the self-repair material method. Background technique [0002] Cement is the most commonly used material in modern construction projects. After being injected with tap water, the cement paste can solidify aggregates such as stones and sand together to form cement-based materials such as mortar and concrete with good compression resistance. However, the production of cement often causes serious environmental pollution and energy loss, including the emission of carbon dioxide and air particles, and the consumption of heat energy. In the natural environment, cement-based materials such as concrete often produce cracks due to factors such as temperature changes, resulting in the infiltration of externa...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B28/02C04B111/34
CPCC04B28/04C04B28/02C04B2111/343C04B14/06C04B24/38C04B22/124C04B22/085C04B22/12C04B22/148C04B2103/0001C04B24/2652C04B24/04C04B24/06
Inventor 刘珞王虎群高苗苗郭嘉
Owner BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
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