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Deicing salt on asphalt and asphalt mixture performance impact study

Author: FuGuangWen
Tutor: ChaXuDong
School: Changsha University of Science and Technology
Course: Road and Railway Engineering
Keywords: Deicing salt Asphalt Asphalt Road performance Void Flexural strength Splitting strength ratio Dynamic Stability
CLC: U414
Type: Master's thesis
Year: 2010
Downloads: 272
Quote: 5
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Abstract


Winter snow disaster weather has seriously affected the road traffic safety, in order to ensure smooth flow of traffic safety, to avoid serious economic losses, deicing get a lot of applications, but Asphalt' dissertation">Asphalt Pavement deicing salt will cause significant performance degradation. To this end, this paper deicing salt on asphalt and asphalt pavement performance, select NaCl, CaCl2 and NC three kinds of deicing salt to carry out laboratory experiments. (1) of three different concentrations of deicing salt and temperature conditions in the dissolving capacity, snow and ice melting capability capacity test results show that the effect of different snow melting agent in the melt there is a big difference, when used in the form of a solution deicing , snowmelt strengths and weaknesses sort of NaCl gt; NC gt; CaC12; when deicing salt in solid form, the order of the strength of the ice-melting capacity CaC12 gt; NC gt; NaCl. Therefore, NC combines the advantages of NaCl and CaC12, fast and stable ice melting of snow. (2) through the asphalt three indicators, Brookfield viscosity, film rotary oven heating, DSC / TG, IR spectroscopy and other tests before and after the impact on the deicing asphalt and SBS modified asphalt pavement performance are compared and analyzed. The results show that the effect of deicing salt, asphalt temperature susceptibility and high temperature performance improved low temperature performance and reduce anti-aging properties, asphalt no significant changes in the molecular structure, degree of influence by order of CaCl2 gt; NC gt; NaCl; For SBS modified asphalt, temperature resistance, high temperature performance, anti-aging properties were lower, while the mass loss and thermal stability changed little, sorted by degree of influence as NaCl gt; NC gt; CaCl2. (3) use of deicing salt soak and freeze-thaw basalt coarse aggregates were Los Angeles abrasion value and aggregates crushing value test, and asphalt and mortar - coarse aggregate adhesion test results show that the wear resistance of coarse aggregate capacity With the immersion time was significantly reduced, by order of impact NaCl gt; NC gt; CaCl2; each deicing salt on the coarse aggregate crushing capacity has little effect; through CaCl2, NC effects of asphalt and mortar - rough sets adsorption capacity feed system, the ability to reduce the effect of NaCl, sorted by impact of CaCl2 gt; NC gt; NaCl. (4) by means of freeze-thaw splitting, cold bending, rutting and other tests to study the deicing on Asphalt Mixture Performance. The results show that the effect of deicing salt, asphalt mixture ratio of freeze-thaw splitting strength, flexural tensile strength, dynamic stability and other performance indicators have declined, in general terms, the impact sort of NaCl gt; NC gt; CaCl2. In summary, deicing salt on asphalt and asphalt road performance has a significant impact, the degree of influence of different deicing larger difference. By proper selection of the type of deicing salt, modified asphalt pavement types and controlling porosity can enhance resistance of asphalt pavement deicing impacts.

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