High-ductility self-recovery cement-based material and preparation method thereof

A cement-based material and self-restoring technology, which is applied in the field of high-ductility self-restoring cement-based materials and its preparation, can solve problems such as limiting the use of shape memory alloys, difficulty in implementation, and new structural hazards, so as to improve service life and reduce structural damage. Damage, the effect of improving electrical conductivity

Inactive Publication Date: 2020-11-13
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN109695458A discloses a shape memory alloy curved tube to realize the repair function of the structure, but the implementation is difficult, the temperature rise will bring new hazards to the structure, and at the same time, the aggregate content of the concrete material is high, the matrix is ​​brittle and other factors are limited The use of shape memory alloys

Method used

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  • High-ductility self-recovery cement-based material and preparation method thereof
  • High-ductility self-recovery cement-based material and preparation method thereof
  • High-ductility self-recovery cement-based material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A high ductility self-healing cement-based material, including cement mortar, carbon black, and SMA fiber. The cement mortar includes the following components according to the mix ratio: 200 parts of Portland I type cement, 25 parts of glass powder, and 400 parts of refined quartz sand , 900 parts of Class I fly ash, 330 parts of water, 4 parts of polycarboxylate high-performance water reducing agent; the unit is Kg / m 3 . Wherein, the dosage of SMA fiber is 0.5% of the volume of cement mortar, and 5 parts of conductive carbon black. The ratio of SMA fiber to carbon black is 32:5. SMA fiber shapes such as figure 1 shown.

[0025] The method for preparing the above-mentioned high-ductility self-healing cement-based material specifically includes the following steps:

[0026] (1) Accurately weigh the quality of each raw material according to the mix ratio;

[0027] (2) Start the mixer, first wet the inner surface of the mixer, then add cement, quartz sand, fly ash and...

Embodiment 2

[0032] On the basis of Example 1, different from Example 1, 250 parts of Portland Type I cement, 20 parts of glass powder, 420 parts of refined quartz sand, 900 parts of Class I fly ash, 350 parts of laboratory tap water, 6 parts of polycarboxylate high-performance water reducing agent, 10 parts of conductive carbon black, the volume content of SMA fiber is 1%, and the ratio of SMA fiber to carbon black is 64:10.

[0033] The test under the same conditions as in Example 1 showed that the 28d tensile strength was 4.8 MPa, and the ultimate tensile strain was 0.23%. In its ultimate tensile strain stage, the stress is removed after cracking, and after standing for a period of time, most of the tiny cracks are closed, and the closing rate reaches more than 50%, and the width of the main cracks in the final stretching area is significantly reduced, as image 3 (b) shown. By comparing the change of resistivity after cracking and recovery, it is found that the resistivity after recov...

Embodiment 3

[0035] On the basis of Example 1, different from Example 1, 200 parts of Portland Type I cement, 950 parts of Class I fly ash, 350 parts of laboratory tap water, 10 parts of conductive carbon black, the volume of SMA fiber mixed The amount is 1.5%, and the ratio of SMA fiber to carbon black is 96:10.

[0036] The test was carried out under the same conditions as in Example 1, the 28d tensile strength was 5.0 MPa, and the ultimate tensile strain was 0.37%. In its ultimate tensile strain stage, the stress is removed after cracking, and after standing for a period of time, most of its tiny cracks are closed, and the closing rate reaches more than 80%. The width of the main cracks in the final stretching area is obviously reduced and almost completely closed, showing an obvious cracking mode with many cracks, such as image 3(c) shown. By comparing the change of resistivity after cracking and recovery, it is found that the resistivity after recovery is 75% lower than that after ...

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Abstract

The invention discloses a high-ductility self-recovery cement-based material and a preparation method thereof, the cement-based material comprises cement mortar, SMA fibers and carbon black, and the mass ratio of SMA fibers to carbon black is 32: 5-96: 10. The preparation method of the high-ductility self-recovery cement-based material comprises the following steps: mixing the cement mortar with the carbon black, and adding the SMA fibers to obtain the high-ductility self-recovery cement-based material. The cement-based material disclosed by the invention has high ductility, can sensitively monitor the cracking condition, and can be self-recovered after cracking; the SMA fibers are uniformly dispersed by changing the feeding sequence, so that the prepared cement-based material has the characteristics of high ductility and multi-crack development of a common fiber cement-based material, and also has the capability of recovering part of cracks.

Description

technical field [0001] The invention relates to a cement-based material and a preparation method thereof, in particular to a high-ductility self-recovering cement-based material and a preparation method thereof. Background technique [0002] With the development of construction industrialization, CFST has been widely used due to its high bearing capacity, good plasticity and toughness, prefabrication, and simple construction, and has achieved good social and economic benefits. However, as the requirements for engineering quality are getting higher and higher, the performance of the concrete materials contained in the CFST is difficult to meet the engineering requirements. Concrete is a material with high compressive strength and low tensile strength. In actual concrete engineering damage, most of the accidents are caused by the failure of concrete under tension. Therefore, changing the tensile properties of concrete in CFST columns is of great significance to improving the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B40/00C04B14/48C04B14/02C04B111/34
CPCC04B14/022C04B14/48C04B28/04C04B40/0032C04B2111/343C04B2201/50C04B14/06C04B18/08C04B14/42C04B22/002C04B2103/302
Inventor 潘金龙蔡景明韩进生许荔
Owner SOUTHEAST UNIV
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