Reducing Railway Noise with Porous Sound-Absorbing Concrete Slabs

Table 3

Mixture design of porous sound absorption concrete slab for the test.

Expanded perlite	Slag	Cement	Water/cement ratio	Polyester fibre	Water reducing agent	Foaming agent	Foam-stabilising agent
35%	25%	30%	0.2	0.3%	0.75%	1.95%	1%