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Autolysis enhanced self-repairing system, concrete comprising same, and preparation method thereof

A self-healing and reinforced technology, applied in cement production and other directions, can solve the problems of insignificant recovery of mechanical properties, weakened healing ability, poor stability of healing products, etc. Effect

Active Publication Date: 2016-05-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, fly ash, slag and other materials can react with calcium ions to form secondary hydration, but the healing ability is not significant, and the width of the healing crack is less than 150 μm. Due to the secondary hydration consumes calcium ions, the matrix hydration products dissolve and The formation of calcium carbonate is limited; although osmotic crystallization technology can improve the impermeability of cracked concrete, it does not significantly restore the mechanical properties of cement-based materials, and the stability of the healing product is poor; special mineral materials refer to mineral materials with different functions. For example, expansion agent, citric acid, oxalic acid, bentonite, silicon-based materials, sodium carbonate, etc. Although these materials can heal larger crack width (0.4mm), they cannot effectively heal the inside of the crack, and the recovery of mechanical properties is not significant. Participate in the reaction in the early stage, which weakens the healing ability, and the secondary healing ability is average

Method used

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  • Autolysis enhanced self-repairing system, concrete comprising same, and preparation method thereof
  • Autolysis enhanced self-repairing system, concrete comprising same, and preparation method thereof
  • Autolysis enhanced self-repairing system, concrete comprising same, and preparation method thereof

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Embodiment 1

[0045] An autolysis-enhanced self-healing system, the system is an autolysis microsphere composed of ordinary dicalcium silicate and polyvinylpyrrolidone K15 protective film coated with ordinary dicalcium silicate, and the ordinary dicalcium silicate is passed the following method Prepared from:

[0046] (1) After calcium hydroxide and silicon dioxide are dried, they are mixed in a molar ratio of 1:1 to obtain a preliminary mixture;

[0047] (2) Add B to the preliminary mixture at a mass ratio of 100:0.2 2 o 3 , mixed to obtain batch materials;

[0048] (3) The batch is placed in a ceramic ball mill tank for mixing for 6 hours, and pressed into a test block under a pressure of 100kN;

[0049] (4) Put the test piece in the calcination furnace, heat up to 1440°C at a heating rate of 5°C / min, keep the temperature constant for 2 hours, and then cool it to room temperature with air to obtain ordinary dicalcium silicate.

[0050] A kind of concrete with the above-mentioned self-...

Embodiment 2

[0055] An autolysis-enhanced self-healing system, which is an autolysis microsphere composed of ordinary dicalcium silicate and a polylactic acid protective film coated with ordinary dicalcium silicate, and ordinary dicalcium silicate is prepared by the following method :

[0056] (1) after calcium hydroxide and silicon dioxide are dried, mix according to molar ratio 3: 1, obtain primary mixture;

[0057] (2) Add B to the preliminary mixture at a mass ratio of 100:1 2 o 3 , mixed to obtain batch materials;

[0058] (3) The batch is placed in a ceramic ball mill tank for mixing for 10 hours, and pressed into a test block under a pressure of 100kN;

[0059] (4) Put the test piece in the calciner, raise the temperature to 1440°C at a heating rate of 5°C / min, leave the furnace at a constant temperature for 6 hours, and then cool it to room temperature with air to obtain ordinary dicalcium silicate.

[0060] A kind of concrete with the above-mentioned self-dissolving enhanced s...

Embodiment 3

[0065] An autolysis-enhanced self-healing system, which is an autolytic microsphere composed of ordinary dicalcium silicate and a polycaprolactone protective film coated with ordinary dicalcium silicate, and the ordinary dicalcium silicate is prepared by the following method into:

[0066] (1) after calcium hydroxide and silicon dioxide are dried, mix according to molar ratio 2:1, obtain primary mixture;

[0067] (2) Add B to the preliminary mixture at a mass ratio of 100:0.5 2 o 3 , mixed to obtain batch materials;

[0068] (3) Place the batch material in the ceramic ball mill tank for mixing for 8 hours, and press it into a test block under a pressure of 100kN;

[0069] (4) Put the test piece in the calcination furnace, heat up to 1440°C at a heating rate of 5°C / min, keep the temperature constant for 4 hours, and then cool it to room temperature with air to obtain ordinary dicalcium silicate.

[0070] A kind of concrete with the above-mentioned self-dissolving enhanced s...

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Abstract

The invention relates to an autolysis enhanced self-repairing system, concrete comprising the same, and a preparation method thereof. The self-repairing system is composed of autolysis microspheres composed of a dicalcium silicate repairing material and a protective film that covers the dicalcium silicate repairing material. The concrete is prepared by mixing a gel material, aggregate, autolysis microspheres, and water and then pouring the mixture. The added dicalcium silicate repairing material accounts for 8 to 12% of the weight of the gel material. The preparation method of concrete comprises the following steps: (1) preparing autolysis microspheres: wrapping the dicalcium silicate repairing material by a protective film; (2) preparing concrete: adding autolysis microspheres into water, stirring to evenly disperse the microspheres, then adding a gel material and coarse aggregate in sequence, evenly stirring, casting, moulding, removing the mould, and performing maintenance to obtain the concrete. Compared with the prior art, the system has the advantages that the microspheres have a good autolysis property, the controllability is good, the strength can be prominently recovered in primary repairing, the performance of secondary repairing is excellent, the adhesive strength is strong, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an autolysis enhanced self-repair system, concrete with the system and a preparation method thereof. Background technique [0002] The design life of the urban rail transit tunnel structure is 100 years. The rock and soil conditions in which it is located are complex, the surrounding environment is sensitive, the train running density is extremely high, and the service conditions are harsh. Or cannot be replaced, and will induce underground engineering disasters. Cracks in cement-based materials are the root cause of premature structural failure. The self-healing system of cement-based materials provides a new method for the repair of micro-cracks in the concrete matrix and effectively delays potential damage. A self-healing system will eliminate the high cost of effective monitoring and external repair, and avoid artificial Problems such as the outage of rail transi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/02C04B7/32C04B7/36C04B20/10
CPCC04B7/02C04B7/32C04B7/36C04B20/1033C04B20/1037Y02P40/10
Inventor 蒋正武袁政成陈庆
Owner TONGJI UNIV
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