MANUFACTURING METHOD OF POROUS SOUND-ABSORBING CONCRETE BLOCK USING WASTE CONCRETE BYPRODUCT, LIGHT WEIGHT AGGREGATE, ARTIFICIAL ZEOLITE

摘要

PURPOSE: A manufacturing method of a porous sound-absorbing concrete block is provided to prevent the contamination of environment and improve utility of materials through the use of waste materials. CONSTITUTION: In the manufacture of the porous sound-absorbing concrete block, a normal Portland cement having a specific gravity of 3.14 to 3.22 is used. The Portland cement consists of 60 to 65 weight percent of Ca, 20 to 24 weight percent of SiO2, and 3.5 to 5.5 weight percent of Al2O3. Further, used is aggregate obtained by mixing broken pieces having grain sizes of 2 to 5mm, 5 to 13mm, and 13 to 20mm, and having a specific gravity of 2.60 to 2.75, or KS waste concrete recycled aggregate having a specific gravity of 2.42 to 2.55 with light weight aggregate having a specific gravity of 0.8 to 1.8 and an absorptivity of 1.2 to 1.8 percent. In order to secure a constant workability and an increase of strength of cement paste, AE water-reducing agent is mixed in an amount of 0.5 to 1.2 percent. Further, the cement paste is endowed with a continuous porosity of 15 to 30 percent, thereby achieving a reduction in sound energy through the friction of pore surfaces.