The influence of glycol

the main composition of the most frequently used aircraft dicer

on the freezethaw durability of high performance concrete (HPC ) is investigated. Freezethaw durability of HPC is tested by accelerated freez e thaw test. Four kinds of the solution

i.e.

tap water

35％ NaCl solution

glyc ol solutions

and a LBRA type commercial aircraft deicer are employed. Results s how that freezethaw durability of HPC exposed to glycol solutions is closely related to the solution concentrations. The failure of HPC exposed to 35％ gl ycol solution is similar to that of those exposed to 35％ NaCl solution

i.e.

serious surface scaling. While the damage of HPC exposed to 125％—2 5％ glycol solutions is postponed. Compared with glycol solution

the commercia l aircraft deicer has much more negative effects on HPC freezethaw durability compared with 35％ NaCl solution. In t he presence of com mercial aircraft deicer for HPC subjected to freezethaw cycles

the deteriora tion is mainly due to scaling and spalling.