How GRC performs?
It is worth noting that this test was performed using frequencies from a highway where automobiles are traveling at much slower speeds than the speeds of high-speed trains.
There are obvious advantages and disadvantages of using concrete as an acoustic barrier compared to the nearest competitors. Firstly, concrete will be able to withstand the wind and aerodynamic loading much better than, for example, timber. On the other hand, concrete acoustic barriers located on highways and bridges will significantly increase the self-weight of the structure and may mean the superstructure will need to be reconsidered with the additional weight.
The properties of foamed concrete vary widely, and it can, therefore, be used in a wide variety of applications. It is described as a highly aerated paste, typically containing between 30% and 80% air bubbles. The bubble size varies between 0.1 and 1.5mm in diameter, but coalescence (which is the merging of bubbles) may produce voids of much larger size. It comprises Portland Cement, water, fine aggregate and mechanically produced foam which allows it to have high workability and therefore compact under its own weight. The typical densities of foamed concrete are between 400 and 1600kg/m³ and are therefore generally lighter than aggregate concrete. In fact, final dry densities are up to 300kg/m³ lower than normal concrete.