Table 4.

Acoustic insulation of different fibrous concrete composites.

Type of Fiber	Main Findings	Refs.
Rock wool	Similar acoustic behavior to glass wool	[108]
Carbon and glass fiber	Composites made with carbon fiber has higher SAC relative to glass fibered composite	[109]
Fibrous metal materials	Used to make silencers in cars	[110]
Glass wool	Comparison made between the Bies–Allard and Kino–Allard’s acoustic methods	[111]
Metal fiber felts	Used as an absorption material in silencers	[112]
Glass fiber-reinforced epoxy	Investigated the acoustic absorption properties of different composites	[113]
Sintered fibrous metals	Determined anisotropic acoustic properties of of sintered fibrous metals	[35]
Glass fiber recycled from deserted print circuit boards	Utilized for noise-reducing applications	[114]
Metal fiber	Absorption properties depends on the material properties such as the diameter, porosity, and thickness of fiber	[115]
Glass fiber felt	The direction of sound incidence and structure of the composite affects the sound insulation	[115]
Carbon fiber	Increases the sound absorption coefficient of a helical-shaped composite sound absorber	[116]
Fouled sintered fiber felts	Depends on the flow resistivity measurements	[117]
Basalt fiber	Panels shows a good absorption coefficient that increases with thickness and density	[118]
Carbon fiber	Composites made with carbon fibers shows higher absorption coefficients than Kevlar fiber at low to medium frequencies	[119]
Glass fiber-filled honeycomb sandwich panels	Improves the absorption coefficient at frequencies below 4.5 kHz	[120]
Metal fiber porous materials	Porous material can effectively enhance the sound absorption coefficient	[121]