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- W2374123435 abstract "Sound control structure, according to characteristics of orbit traffic sound and sound spread, is designed. T frame is used at the middle of orbits and distortion L frame is used at outside of orbit to improve the sound control efficiency and to reduce the infection for sightsee. All of wedge absorber, porous absorber, cavum resonance absorber and film resonance absorber are utilized to design the craftwork on form, structure, surface waterproof and preparation about sound absorption material. Sound absorption material CEMCOM, of which sound absorption coefficients reach 021, 0.66, 0.91, 0.94, 1.06 and 0.99 separately on 6 frequencies of 125, 250, 500, 1 000, 2 000, and 4 000 Hz, which meets ASTM E761, is produced by means of controlling diameter of grain, compress rate, admixture and water-adding. Expand perlite is used as aggregate after water-hate pretreatment, Sulfoaluminte cement is used as cement, Dura fiber is used to increase the intensity, techniques of abio-sparkle is utilized and half-dry material compress molding are exercised when producing CEMCOM." @default.
- W2374123435 created "2016-06-24" @default.
- W2374123435 creator A5069306155 @default.
- W2374123435 date "2005-01-01" @default.
- W2374123435 modified "2023-09-25" @default.
- W2374123435 title "Design on orbit traffic sound control structure anddevelopment on sound absorption material" @default.
- W2374123435 hasPublicationYear "2005" @default.
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