Crack self-repairing concrete using aerobic basophilic microorganisms and preparation method thereof
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An alkaliphilic microorganism and self-repairing technology, applied in the field of concrete materials, can solve problems such as limited application, high cost, and toxicity of repairing adhesives, and achieve good durability and volume stability, good mechanical properties and durability, and save energy. The effect of maintenance funds
Active Publication Date: 2016-10-26
TAIYUAN UNIV OF TECH
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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; 3. The repai
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Embodiment 1
[0043]A self-healing concrete for cracks using aerobic alkaliphilic microorganisms, made of the following raw materials in parts by weight: 90 parts of expanded perlite particles, 400 parts of cement, 950 parts of stones, 425 parts of sand, 11 parts of silica fume, and 310 parts of water 12 parts of calcium lactate, 3 parts of superplasticizer.
[0044] The preparation method of expanded perlite particles comprises the following technological process:
[0045] Vector preparation:
[0046] (1) Select Bacillus pseudostrongis, purify and cultivate the strain;
[0047] (2) Preparation of culture medium for aerobic basophilic microorganisms (content of each component per liter: distilled water 1L, peptone 5g, beef extract 3g);
[0048] (3) Adjust the pH value of the above culture medium to 9.7 with 1mol / L sodium sesquicarbonate sterile solution (the content of each component per liter: sodium bicarbonate 42g, anhydrous sodium carbonate 53g), and sterilize at 120°C for 30 Minutes...
Embodiment 2
[0060] A self-healing concrete for cracks using aerobic alkaliphilic microorganisms, made of the following raw materials in parts by weight: 120 parts of expanded perlite particles, 435 parts of cement, 1025 parts of stones, 430 parts of sand, 12 parts of silica fume, and 290 parts of water parts, 13 parts of calcium lactate, and 3 parts of superplasticizer.
[0061] The preparation method is the same as in Example 1.
Embodiment 3
[0063] A self-healing concrete for cracks using aerobic alkaliphilic microorganisms, made of the following raw materials in parts by weight: 130 parts of expanded perlite particles, 445 parts of cement, 1050 parts of stones, 435 parts of sand, 13 parts of silica fume, and 275 parts of water 14 parts of calcium lactate, 3 parts of superplasticizer.
[0064] The preparation method is the same as in Example 1.
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Abstract
The invention relates to crack self-repairing concrete using aerobic basophilic microorganisms and a preparation method thereof. The concrete contains expanded perlite loading an aerobic basophilic microorganism repair agent, cement, pebbles, sand, silica fume, water, calcium lactate and water reducer. The crack self-repairing concrete has the crack self-repairing function and has heat-preservation and heat-insulation functions, the aerobic basophilic microorganisms serve as a crack repairing agent, calcium lactate serves as nutritional matter for microorganism metabolism, and expanded perlite serves as a carrier of the crack repairing agent. When concrete cracks, water and air enters the cracks so that resting microorganisms can restore the metabolism function, calcium lactate is converted into calcium carbonate precipitate, and accordingly the aims of automatically diagnosing and repairing the concrete cracks, preventing expansion of the cracks and improving concrete impermeability are achieved. The microorganism crack self-repairing concrete serves as a concrete material integrating the functions of crack self-diagnosis and self-repairing, lightweight, heat preservation and heat insulation, and has large research value and application potential.
Description
technical field [0001] The invention relates to a concrete material, especially a crack self-repairing concrete material, in particular to a crack self-repairing concrete which uses aerobic alkaliphilic microorganism technology to realize crack self-diagnosis and self-repair, and has the function of heat preservation and heat insulation. Background technique [0002] Concrete is widely used in construction engineering because of its advantages of high compressive strength, good durability and low cost. However, concrete is a typical brittle material, which will inevitably produce micro-cracks or local damage under the action of external force or other factors, resulting in a decrease in its mechanical properties and durability. If effective treatment measures are not taken in time, the cracks may further expand, making it easier for harmful substances such as water, oxygen, carbon dioxide, and chlorides to enter the interior of the concrete, which may cause corrosion of stee...
Claims
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Application Information
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