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Title:
PRODUCTION OF SOUND ABSORBING CONCRETE PLATE
Document Type and Number:
Japanese Patent JP3774292
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide a method to produce a sound absorbing concrete plate having ≥0.8 sound absorption rate for sound in 400 to 4000 Hz frequency region at a low cost.
SOLUTION: (1) A porous concrete having 20 to 40% continuous porosity and 2 to 5 mm average diameter of vacancies is supplied in a mold frame having a rugged pattern in the bottom in such a manner that the supplied concrete has 50 to 80% thickness of the objective concrete plate. (2) A foamed resin member containing ≥1.0 weight ratio of heavy oil to the foamed resin member is fixed to embed the upper face or a part of the porous concrete in such a manner that the projected area of the foamed member on the sound absorbing face is ≥15% of the area of the face of the concrete. (3) A normal concrete is applied thereon and formed. (4) The body is aged in vapor at ≤60°C to shrink the formed resin member in the plate so that an air reservoir 3 is formed in the concrete plate comprising the porous concrete part 1 and the normal concrete part 2.


Inventors:
Hiromi Fujiwara
Akito Dozono
Shinichi Takemoto
Castle
Application Number:
JP8354097A
Publication Date:
May 10, 2006
Filing Date:
April 02, 1997
Export Citation:
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Assignee:
Taiheiyo Cement Co., Ltd.
Dopy Construction Industry Co., Ltd.
International Classes:
C04B38/00; E01F8/00; B32B5/18; B32B13/12; C04B32/00; C04B41/00; C04B41/52; E01F8/02; (IPC1-7): C04B32/00; B32B5/18; B32B13/12; C04B38/00; E01F8/00; E01F8/02
Domestic Patent References:
JP53088024A
JP58187305A
JP2131296A
JP6048810A
JP8013644A
JP8217560A
JP8283079A
JP10102623A
Attorney, Agent or Firm:
Nao Okuyama
Arihara Koichi
Shoichi Okuyama
Naoyuki Koda
Matsushima Tetsuo