The Environmental Adaptability Research Of The Silicate-Based Porous Sound-Absorbing Material

Silicate and various additional materials are adopted as raw materials, a new silicate-based porous sound-absorbing material is developed through the way of in-situ assembly. Through analysis, we get that this silicate-based porous sound-absorbing material is mainly applied to The sidewalls of the bridge, highway, highway tunnel wall, railway station wall, Rail transit, Noisy industrial park and other serious environmental noise pollution and so on. According to the composition, molding process and structure characteristics of this material, and its probable application conditions, We work out the environmental adaptability test scheme for this material. Artificial accelerated test environment for this material about normal outdoor high temperature, wetting-drying cycles, salt-fog, the freeze-thaw cycles of these four conditions are made in laboratory. And we get the changing rule of the sound absorption coefficient and compressive strength of this silicate-based porous sound-absorbing material in the corresponding conditions. Then, we evaluate the adaptability of this material in each kind of condition above and Put forward some Suggestions for improvement.Neither the normal outdoor high temperature nor the salt-fog have little effect on the sound absorption coefficient of this material, but wetting drying cycles has a smaller effect on the sound absorption properties of silicate-based porous sound-absorbing material. After15wetting-drying cycles, its average sound absorption coefficient increase by about9%. So, it has almost little effect on the sound absorption coefficient when under the three kinds of environment above. The condition of wetting-drying cycles has a certain influence on the mechanical property of the silicate-based porous sound-absorbing material that with the increasing number of the cycles, its compressive strength shows increasing first then reducing down and finally to maintain a stable trend. Its compressive strength value is reduced to about95%of the initial and then remain stable after15cycles. The condition of salt-fog also affected the mechanical property of the silicate-based porous sound-absorbing material. The compressive strength value of this material shows increasing fist and then to maintain a stable trend. Its strength is increased to the maximum Around130%of initial strength after staying in the condition of salt-fog16days. The condition of normal outdoor high temperature almost has no effect on the mechanical property of the silicate-based porous sound-absorbing material. This material can work very well under all the three conditions above. The freeze-thaw cycles has a lot affect on the mechanical property of this material. The compressive strength of the material will be reduced as the cycle number increasing, and the reduce rate will experience a process from fast to slow. The compressive strength will not change obviously any longer when it is reduced to about50%of the initial. The mechanical property of the silicate-based porous sound-absorbing material will be significantly weakened when under the condition of freeze-thaw cycles and this situation may lead to some potential safety problems, so the material should avoid the condition of freeze-thaw cycles as far as possible when it’s applied.