Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Application of temperature-sensitive hydrogel in improving concrete shrinkage and cracking resistance

A temperature-sensitive hydrogel and concrete technology, which is applied in the field of road materials, can solve the problems of poor anti-shrinkage cracking effect and affect the mechanical properties of cement concrete, etc., and achieve the goal of improving anti-shrinkage performance, cracking resistance performance, and water retention capacity Effect

Inactive Publication Date: 2018-06-29
CHANGAN UNIV
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 concrete, so as to solve the poor effect of the prior art on the anti-shrinkage cracking of cement concrete, which affects the performance of cement concrete. Technical issues of mechanical properties

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Application of temperature-sensitive hydrogel in improving concrete shrinkage and cracking resistance
  • Application of temperature-sensitive hydrogel in improving concrete shrinkage and cracking resistance
  • Application of temperature-sensitive hydrogel in improving concrete shrinkage and cracking resistance

Examples

Experimental program
Comparison scheme
Effect test

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
densityaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C08F120/54C08J3/075C04B111/34
CPCC04B28/04C04B2111/343C04B2111/346C08F120/54C08J3/075C08J2333/24C04B14/00C04B22/002C04B24/2652
Inventor 王振军赵鹏白敏吴佳育刘加平李辉
Owner CHANGAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com