as used herein a formliner is a rubber or plastic liner that is placed at the bottom of the form and creates the face of a panel another advantage of using chemically treated wood particles is that unlike stone aggregate and granulated rubber wood particles are fibrous the fibrous nature of wood makes wood particles natural sound absorbers a stone aggregate and granulated rubber mixture creates channels that dissipates sound energy and absorb noise however the stone aggregate also reflects noise replacing a percentage of stone aggregate with chemically treated wood particles decreases the amount of reflected sound energy and increased sound absorption an additional advantage of using chemically treated wood particles is the wood particles create additional tortuosity within the interconnected sound absorbing channels increasing the tortuosity within the interconnected sound absorbing channels dissipates additional sound energy consequently using chemically treated wood particles in the sound absorbing layer increases the amount of absorbed sound energy as mentioned above the bond between the sound absorbing layer and the structural concrete layer is very critical if the bond between the layers is weak the sound absorbing layer can dislodges from the structural concrete layer failure of the bond is dangerous because large pieces of the sound absorbing layer may fall and endanger the general public products using a cement binder mixed.