Dissertation
Dissertation > Transportation > Road transport > Road works > Road construction materials

Freezing-thawing Durability of Concretes Subjected to Aircraft Deicer

Author CaoWenTao
Tutor YuHongFa
School Nanjing University of Aeronautics and Astronautics
Course Road and Railway Engineering
Keywords concrete durability aircraft deicer freezing-thawing corrosion concentration flaking inhibition
CLC U414
Type Master's thesis
Year 2009
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Before air plane takes off, ice covered on the air planes must all be melted away as icing is one of the important factors of flight safety. large quantities of glycol-based aircraft deicer(AD) were used to deice on aircraft for the purpose of ensuring wintertime flight safety in cold area. Destruction such as surface flaking of the airport pavement is durability damage of concrete, and enough concerns should be given to deal with safety hidden danger of flight.In this paper, three series of concrete, namely Ordinary Portland cement concrete(OPC), high performance concrete of Portland cement (HPC-P?Ⅱ) and high performance concrete of anti-sulfate fate cement (HPC-P?HSR), were prepared on the proportion principals of altering of binder and incorporating with synergistic effect of fly ash(FA), water reducing and air-entraining properties of concrete admixture and hybrid fiber. Room-temperature corrosion test and rapid freezing-thawing experiment were taken in water,3.5%NaCl solution, AD arrange from 3.5% to 25% and 25% LBR-A to study durability of concrete. Deterioration process and features of concretes subjected to the aircraft deicer were investigated by a large number of laboratorial experiments. Eventually, cement type, content of fly ash and effect of fiber and hybrid fiber were probed on the inhibition of deterioration in aircraft deicer. Main conclusions are drawn as follows:(1)The deterioration of concrete in aircraft deicer is freezing-thawing damage without influence of corrosion. Freezing-thawing damage of concrete in aircraft deicer behaves severe flaking of surface while internal damage of concrete is the major feature as well in 3.5% AD.(2) Freezing-thawing damage of OPC obviously intensifies in low concentration AD while it weakens in high concentration AD, and damage in low concentration AD especially is inhibited by HPC-P?Ⅱand HPC-P?HSR.(3)Deterioration of concrete in aircraft deicer weakens with the growth of concentration arrange from 3.5% to 25%.(4)Proper selection of binder, appropriate addition of FA and application of fiber can reduce freezing-thawing damage effectively in 3.5% aircraft deicer.

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