Application of temperature-sensitive hydrogel in improvement of anti-dry-shrinkage cracking property of concrete

A temperature-sensitive hydrogel and concrete technology, applied in the field of road materials, can solve the problems of affecting the mechanical properties of cement concrete and the poor anti-drying shrinkage cracking effect, so as to improve the anti-drying shrinkage performance, improve the anti-cracking performance and reduce the shrinkage rate. Effect

Inactive Publication Date: 2017-01-04
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a temperature-sensitive hydrogel for improving the anti-shrinkage cracking performance of c...

Method used

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  • Application of temperature-sensitive hydrogel in improvement of anti-dry-shrinkage cracking property of concrete
  • Application of temperature-sensitive hydrogel in improvement of anti-dry-shrinkage cracking property of concrete
  • Application of temperature-sensitive hydrogel in improvement of anti-dry-shrinkage cracking property of concrete

Examples

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Embodiment 1

[0027] The present embodiment provides a kind of concrete, which is composed of the following raw materials in terms of mass percentage: 4% of thermosensitive hydrogel, 15% of cement, 74% of aggregate, and 7% of water; wherein fine aggregate is 25%, Coarse aggregate is 49%.

[0028] Wherein: the lower critical solution temperature of the temperature-sensitive hydrogel involved is 32°C.

[0029] The fineness modulus of the fine aggregate is 2.8, the mud content is 2.5%, and the apparent density is 2650kg / m 3 , bulk density is 1420kg / m 3 . The particle size distribution of the coarse aggregate is 10-31.5mm, the crushing index is 7.5%, and the apparent density is 2690kg / m 3 , the mud content is 0.5%. The total volume occupied by aggregates in concrete is very high, but in most cases, it is difficult to reach the critical saturation inside the aggregates, so the concrete performance changes caused by aggregates are small, so this application uses different particle sizes aggr...

Embodiment 2

[0037] This embodiment provides a kind of concrete, which is composed of the following raw materials in terms of mass percentage: 3% of temperature-sensitive hydrogel, 16% of cement, 73% of aggregate, and 8% of water.

[0038] In this embodiment, the requirements for raw materials and the preparation method of concrete are the same as in Example 1, the difference is that the additions of N-isopropylacrylamide monomer, deionized water, initiator and crosslinking agent are respectively : 6g, 54g, 0.0024g, 0.0033g.

[0039] The performance test results of this embodiment are shown in Tables 1-4.

Embodiment 3

[0041] This embodiment provides a kind of concrete, which is composed of the following raw materials in terms of mass percentage: 5% of thermosensitive hydrogel, 14.2% of cement, 74% of aggregate, and 6.8% of water.

[0042]In this embodiment, the requirements for raw materials and the preparation method of concrete are the same as in Example 1, the difference is that the additions of N-isopropylacrylamide monomer, deionized water, initiator and crosslinking agent are respectively : 10g, 90g, 0.0041g, 0.0055g.

[0043] The performance test results of this embodiment are shown in Tables 1-4.

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Abstract

The invention provides application of temperature-sensitive hydrogel in improvement of the anti-dry-shrinkage cracking property of concrete. The concrete is prepared from the temperature-sensitive hydrogel, cement, aggregates and water. A preparation method of the concrete comprises the steps that firstly, the temperature-sensitive hydrogel is prepared; secondly, the aggregates and the water are blended to be uniform; lastly, the temperature-sensitive hydrogel and the water are added, the materials are blended to be uniform, and then the concrete can be prepared. The adopted homemade temperature-sensitive hydrogel is lightly-crosslinked macromolecules which can be polymerized to form a film after releasing water, no hole can be reserved in the cement concrete, and other properties of the cement concrete are not affected while the anti-cracking property of the concrete is improved. The initial volume water content of the concrete is increased along with increasing of the mixing amount of the temperature-sensitive hydrogel, and it is shown that the water storage capacity of the concrete is enhanced by mixing the temperature-sensitive hydrogel; the water absorption rate of the concrete is decreased along with increasing of the mixing amount of the temperature-sensitive hydrogel, and it is shown that the connectivity of capillary pores in the concrete is reduced by mixing the temperature-sensitive hydrogel.

Description

technical field [0001] The invention belongs to the field of road materials and relates to cement concrete materials, in particular to the application of a temperature-sensitive hydrogel in improving the anti-shrinkage and cracking performance of concrete. Background technique [0002] When cement concrete is placed in unsaturated air, the irreversible shrinkage caused by the loss of absorbed water in its internal capillary pores and gel pores is called drying shrinkage deformation, referred to as drying shrinkage. Drying shrinkage is one of the main causes of cement concrete cracking. When the tensile stress caused by shrinkage is greater than the tensile strength of concrete under different constraint states, the cement concrete structure will cause cracks in the concrete, resulting in a decline in the durability of the concrete. Therefore, it has very important engineering application value to carry out the research and improvement of the cracking and drying shrinkage of...

Claims

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Application Information

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IPC IPC(8): C04B28/04C08F120/54C08J3/075C04B111/34
CPCC04B28/04C08F120/54C08J3/075C08J2333/24C04B2111/346C04B2111/343
Inventor 王振军赵鹏白敏吴佳育刘加平李辉
Owner CHANGAN UNIV
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