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Additive for crack self-repairing cement-base material, use method thereof and cement-base material

A technology of cement-based materials and additives, which is applied in the field of cement-based materials and self-repairing additives for cracks in cement-based materials. It can solve the problems of inconvenient mixing of concrete, lack of self-regulation and self-repair, and inability to ensure uniform distribution of concrete structures. Effect of Labor Repair Funding

Inactive Publication Date: 2012-07-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods all have unavoidable defects: the hollow capsules or hollow fibers pre-embedded with the adhesive are all glass tubes, which brings great inconvenience to the mixing of concrete, and cannot ensure uniformity in the concrete structure. distribution; the pre-embedded shape memory alloy can only repair the "line" of concrete cracks but not the repair of "points"; and the in-situ repair method still requires a continuous supply of external energy, and cannot automatically respond appropriately. Lack of self-regulation and self-repair mechanism, and this mechanism produces ammonia gas during the repair process, causing great damage to the atmospheric environment

Method used

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  • Additive for crack self-repairing cement-base material, use method thereof and cement-base material
  • Additive for crack self-repairing cement-base material, use method thereof and cement-base material
  • Additive for crack self-repairing cement-base material, use method thereof and cement-base material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Bacterial culture

[0026] Prepare the culture medium (the composition of the medium is shown in Table 1), adjust the pH = 7.0, sterilize at 121°C for 25 minutes, dry in an oven at 60°C, and inoculate the strain Bacillus halodurans into the Erlenmeyer flask containing the medium ( Aseptic operation), shaking culture at 30°C (oscillating frequency 170r / min) for 24h on a shaking table to obtain a turbid bacterial liquid, the concentration of the bacterial cells contained in the bacterial liquid is (5~6)×10 6 individual / mL. The bacterial liquid was placed in a centrifuge at 7000r / min for 5 minutes, and the bacterial sludge was obtained by freezing and centrifuging.

[0027] Table 1 Medium composition

[0028]

[0029] Selection of carrier

[0030] As a necessary condition for the self-healing of cracks, the carrier mainly plays the role of adsorbing microorganisms and giving them enough space to survive, and the selected slag and ceramsite are both porous. The parti...

Embodiment 2

[0044] According to the mixing ratio shown in Table 3, at the same time, each group was mixed with 100 mL of bacterial sludge obtained by centrifuging the bacterial liquid to form a mortar sample. Cured for 7 days in a standard curing room to obtain the concrete material of the present invention, manufactured cracks according to the method of Example 1, and then repaired, calcium carbonate precipitates could be obviously formed in the cracks in 5 days, and a layer of compact concrete could be formed after 40 days It proves that the cement-based material of the present invention does have self-healing function.

[0045] Table 2 Mortar sample molding mix ratio

[0046]

[0047] The calcium lactate is formulated as a 1%wt aqueous solution for use.

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Abstract

The invention provides an additive for a crack self-repairing cement-base material, a use method thereof and a cement-base material. The additive is composed of bacterial mud which is obtained by centrifuging 270-500g of carriers, 5-10g of calcium lactates and 100mL of bacterial liquid, wherein the bacterial liquid is obtained by inoculating bacterial strains, namely, Bacillus halodurans, to a culture medium for culturing according to a conventional method; the density of thallus contained in the bacterial liquid is (5-6)*106 pieces per mL; the carrier is slag or ceramsite; the calcium lactates are prepared into an aqueous solution with the weight percent of 1% and then are added; according to the cement-base material based on the additive for the crack self-repairing cement-base material, the weight of the additive is 20%-40% of the total weight of the cement plaster and additive; after the additive is cured for 24h, the additive is soaked in constant-temperature oxygen enrichment water bath at 30 DEG C; after 5 days, few white matters are generated in a crack; and after 40 days, the crack is fully filled, so that the crack is completely repaired.

Description

technical field [0001] The invention relates to a self-healing additive for cracks in cement-based materials and a cement-based material, in particular to an additive and a cement-based material that utilize microbial technology and can make cracks produce an automatic repair function. Background technique [0002] In the past 50 years, most of the failures of concrete structures at home and abroad are caused by concrete cracking, so that corrosive media such as sulfate and chloride salts can easily penetrate into the interior of the concrete, causing damage to the concrete itself and the pre-embedded steel bars. The service life of the concrete structure is shortened to the greatest extent, and the accidents caused by it occur frequently, which not only bring huge economic losses to the country and the people, but also seriously threaten personal safety. [0003] The self-healing method of cracks in cement-based materials has received extensive attention and research all ov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/04C04B28/00
Inventor 钱春香潘庆峰
Owner SOUTHEAST UNIV
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