Curing and Adhesive Characteristics of Single-Component Polyurethane Binders
[1]Zhong Ke,Wang Xue,Zhang Meng,et al.Curing and Adhesive Characteristics of Single-Component Polyurethane Binders[J].Journal of Zhengzhou University (Engineering Science),2021,42(06):81-86.[doi:10.13705/j.issn.1671-6833.2021.04.027]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
42
Number of periods:
2021 06
Page number:
81-86
Column:
Public date:
2021-11-10
- Title:
- Curing and Adhesive Characteristics of Single-Component Polyurethane Binders
- Keywords:
- monocomponent polyurethane; curing; adhesion characteristics; isocyanate index; urea index
- CLC:
- -
- DOI:
- 10.13705/j.issn.1671-6833.2021.04.027
- Abstract:
- Monocomponent polyurethane is a reactive adhesive, and its mechanical properties are better than those of conventional asphalt binders, but the reaction process is easily affected by environmental factors such as temperature, air and water, etc. During the paving and rolling construction of polyurethane mixes, it is necessary to strictly control the construction time nodes of each process in combination with the site temperature and humidity working conditions.In order to popularize the application of single-component polyurethane in road, curing and adhesive characteristics of monocomponent polyurethane were studied in this paper. Curing and adhesion characteristics of two single-component polyurethane (PU) binders were studied from FTIR, pull-out and shear tests. With the increase of natural curing conditions, the results showed that the isocyanate index of PU-I and PU-II decreased, while the urea index had the opposite trend. Both the isocyanate index and urea index of PU were stable after 4 days natural curing,and the variation coefficients of isocyanate index and urea index of PU-I and PU-II were 10% and 2%, 2% and 2%, respectively in 4-7 days, which belong to small variations, indicating that PU had basically reached the fully cured state. With the increase of curing time, the pull-out strength and shear strength of polyurethane bonding system generally increased, and the pull-out and shear strength of stone-polyurethane-stone interface were better than those stone-polyurethane-rubber, rubber-polyurethane-rubber bonding system. The pull-out strength of rubber-polyurethane-rubber interface was the worst, and the shear strength of stone-polyurethane-rubber interface was the worst.
- References:
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Last Update:
2021-12-17