Through the shear tests on composite specimens using four different kinds of tack coat material （epoxy resin, SBS modified emulsified asphalt, SBS modified asphalt and H# bridge waterproof material）, the bond condit...Through the shear tests on composite specimens using four different kinds of tack coat material （epoxy resin, SBS modified emulsified asphalt, SBS modified asphalt and H# bridge waterproof material）, the bond condition between layers of porous asphalt pavement under traffic load, temperature variation and moisture situation is evaluated. The test results show that the bond strength decreases with the rise in temperature, and the relationship between shear strength and temperature can be expressed by a logarithm curve at a high reliability. Under the action of traffic load, the value of shear strength of the mixture right under the centre of the wheel track is smaller than that of other parts of the pavement. It is also found that some effects concerning moisture have comparative effects on the bonding of the two layers. Given all the results achieved during the study, it will be quite rewarding to make rational comparisons during selecting the sound type of tack coat.展开更多
Based on the Wuhan Yangtse River Tunnel Project, the low-penetration fiber concrete used in the protecting layer of Wuhan Yangtse River Tunnel tube has been studied in this paper. With the effect of silica fume, slag ...Based on the Wuhan Yangtse River Tunnel Project, the low-penetration fiber concrete used in the protecting layer of Wuhan Yangtse River Tunnel tube has been studied in this paper. With the effect of silica fume, slag and polypropylene fiber on the anti-penetration of tunnel concrete by means of NEL test, XRD and SEM, some conclusions has been drawn. The affection on the anti-penetration capability of the four factors is capacity of silica fume>portion of short and long fiber> fiber VOL Portion>length of Fiber. Fiber capacity of 0.15% is still not good enough for the anti-penetration capability of concrete. While that of 0.5% has exceed the maximum, and the fiber tends to assemble together. Silica fume may greatly enhance the anti-penetration capability of concrete, while the relationship between them is not direct proportion. The average of chloric ion pervasion coefficient with 8% capacity of silica fume is the lowest. Slag may reacted with other component to generate lots of C-A-H. When reacted with free chloride ion, C-A-H may form friedel salt which may also enhance the Anti-penetration capability of concrete.展开更多
文摘Through the shear tests on composite specimens using four different kinds of tack coat material （epoxy resin, SBS modified emulsified asphalt, SBS modified asphalt and H# bridge waterproof material）, the bond condition between layers of porous asphalt pavement under traffic load, temperature variation and moisture situation is evaluated. The test results show that the bond strength decreases with the rise in temperature, and the relationship between shear strength and temperature can be expressed by a logarithm curve at a high reliability. Under the action of traffic load, the value of shear strength of the mixture right under the centre of the wheel track is smaller than that of other parts of the pavement. It is also found that some effects concerning moisture have comparative effects on the bonding of the two layers. Given all the results achieved during the study, it will be quite rewarding to make rational comparisons during selecting the sound type of tack coat.
文摘Based on the Wuhan Yangtse River Tunnel Project, the low-penetration fiber concrete used in the protecting layer of Wuhan Yangtse River Tunnel tube has been studied in this paper. With the effect of silica fume, slag and polypropylene fiber on the anti-penetration of tunnel concrete by means of NEL test, XRD and SEM, some conclusions has been drawn. The affection on the anti-penetration capability of the four factors is capacity of silica fume>portion of short and long fiber> fiber VOL Portion>length of Fiber. Fiber capacity of 0.15% is still not good enough for the anti-penetration capability of concrete. While that of 0.5% has exceed the maximum, and the fiber tends to assemble together. Silica fume may greatly enhance the anti-penetration capability of concrete, while the relationship between them is not direct proportion. The average of chloric ion pervasion coefficient with 8% capacity of silica fume is the lowest. Slag may reacted with other component to generate lots of C-A-H. When reacted with free chloride ion, C-A-H may form friedel salt which may also enhance the Anti-penetration capability of concrete.
