Reducing Railway Noise with Porous Sound-Absorbing Concrete Slabs

Table 1

Parameters of P.O52.5 cement.

80 μm sieve residue (%)	Setting time (min)		Flexural strength; (Mpa)—ISO 679:1989		Compression strength; (Mpa)—ISO 679:1989		Stability
	Initial setting time	Final setting time	3 d	28 d	3 d	28 d
1.5	139	205	4.5	7.8	25.1	55.5	Qualified