Properties of fireproofing coating with dirt resistance and water resistance on tunnel surface

JING Hong-jun; CUI Shi-fu; AI Tao; JING Hong-wei

Volume 17 Issue 5

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JING Hong-jun, CUI Shi-fu, AI Tao, JING Hong-wei. Properties of fireproofing coating with dirt resistance and water resistance on tunnel surface[J]. Journal of Traffic and Transportation Engineering, 2017, 17(5): 50-60.

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JING Hong-jun, CUI Shi-fu, AI Tao, JING Hong-wei. Properties of fireproofing coating with dirt resistance and water resistance on tunnel surface[J]. Journal of Traffic and Transportation Engineering, 2017, 17(5): 50-60.

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Properties of fireproofing coating with dirt resistance and water resistance on tunnel surface

1.
School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, Shaanxi, China
2.
Ankang Highway Bureau of Shaanxi, Ankang 725000, Shaanxi, China
3.
School of Materials Science and Engineering, Chang'an University, Xi'an 710064, Shaanxi, China
4.
Shaanxi Highway Bureau, Xi'an 710068, Shaanxi, China

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Author Bio:
JING Hong-jun(1974-), male, professor, PhD, 424689213@qq.com
Corresponding author: CUIShi- fu(1968-), male, senior engineer, 13689101111@163.com
Received Date: 2017-06-24
Publish Date: 2017-10-25

Abstract

Abstract

In order to improve the dirt resistance and water resistance of fireproofing coating of tunnel surface, waterborne epoxy resin was taken as adhesive, organic silicon polymer, nanometer silicon dioxide and titanium dioxide were taken as antifoulants, brucite fibre was taken as inorganic flame retardant, ammonium polyphosphate (APP) /melamine (MEL) /pentaerythrotol (PER) was taken as organic flame retardant system, the appropriate proportions of organic flameretardant system's components were determined by thermo analysis, the effects of nanometer silicon dioxide, nanometer titanium dioxide, and organic silicon against on the dirt resistance of fireproofing coating were studied by fire test, thermo-gravimetric analysis, sticky dirty resistance test and water resistance test, and the excellent new-type multifunctional fireproofing coating with dirt resistance and water resistance was developed by screening and optimization experiments of formula, fire endurance test and microscopic analysis.Analysis result shows that when the mass ratio of APP, PER and MEL is 2∶1∶1, the charring temperature peak of epoxy resin decreases from 331 ℃to 277 ℃ under the catalysis of APP on PER, and the carbon residue rate of epoxy resin increases by 10%in the temperature range of 270 ℃-800 ℃.The charring peak temperature of APP-PER is lower about 66 ℃ than the decomposition temperature of MEL and about 100 ℃ than the charring temperature of epoxy resin degree, which is helpful to form expanding carbonaceous layer with good heat insulation effect.When 5% organic silane or 3%nanometer silica and 5% nanometer titanium dioxide is added into the flame retardant system comprised of APP, PER and MEL, the fireproofing time of coating is 60 min or 80 min.When quantitative organic silane, nanometer silicon dioxide and nanometer titanium dioxide are added into the flame retardant system together, the fireproofing time of coating increases to 100 min.Then 10%zinc stannate is added into the system, the fireproofing time of coating increases to 120 min.The increase of fireproofing time shows the significant coordination fireproofing effect of the components.The final formula of optimized intumescent fireproofing coating is that the mass ratio of waterborne epoxy resin, silane, composite flame retardant, curing agent, composite nanometer powder and zinc stannate is 40∶5∶33∶4∶8∶10, its dirt resistance grade is 1, its fireproofing time is more than 120 min, and there are no peeling and cracking phenomena after800 himmersion.
- tunneling engineering,
- fireproofing coating,
- tunnel surface,
- dirt resistance,
- water resistance,
- epoxy resin

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References(25)

References

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