Chapter
May 22, 2014
Availability of Density Measuring Methods Estimating Gypsum Hemihydrate Content in Reclaimed Gypsums
Authors: Shinya Inazumi [email protected], Hiroaki Sano [email protected], Mikio Yamada [email protected], and Hsin Ming Shang [email protected]Author Affiliations
Publication: Geoenvironmental Engineering
Abstract
In order to utilize reclaimed gypsums (gypsum board waste) derived from waste plasterboards as geo-materials, thermal behaviors of the reclaimed gypsums and reagent gypsum are investigated in this paper. As a result, it was found that the dihydrate gypsum is changed into the hemihydrate gypsum under thermal condition of 90°C and the hemihydrate gypsum is changed into anhydrite under that of 120°C with heating of 24 hours. The followings are clarified in this paper:(1) The cement density measuring method was available in order to measure the density of reclaimed gypsums; (2) that density was dependent on the drying conditions of the reclaimed gypsums; and (3) the density measuring method was appropriate to estimate the gypsum hemihydrate content on reclaimed gypsums.
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Information
Published In
Geoenvironmental Engineering
Pages: 222 - 231
Copyright
© 2014 American Society of Civil Engineers.
History
Published online: May 22, 2014
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ASCE Technical Topics:
- Cement
- Concrete
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Geomaterials
- Geomechanics
- Geotechnical engineering
- Gypsum
- Materials characterization
- Materials engineering
- Measurement (by type)
- Minerals
- Recycling
- Soil mechanics
- Soil properties
- Temperature effects
- Temperature measurement
- Thermal properties
- Thermodynamics
Authors
Affiliations
Akashi National College of Technology, 679-3, Nishioka, Uozumi, Akashi, Hyogo 6748501, Japan. E-mail: [email protected]
Oita National College of Technology, 1666, Maki, Oita, Oita 8700152, Japan. E-mail: [email protected]
Fukui National College of Technology, Geshi, Sabae, Fukui 9168507, Japan. E-mail: [email protected]
Jines Construction Co. Ltd., No. 67, Lane 11, Kwang-Fu N. Road, Taipei City, Taiwan. E-mail: [email protected]
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