Availability of density measuring methods estimating gypsum hemihydrate content in reclaimed gypsums

Shinya Inazumi, Hiroaki Sano, Mikio Yamada, Hsin Ming Shang

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish
Title of host publicationGeoEnvironmental Engineering - Selected Papers from the Proceedings of the 2014 GeoShanghai International Congress
PublisherAmerican Society of Civil Engineers (ASCE)
Number of pages10
Edition241 GSP
ISBN (Print)9780784413432
Publication statusPublished - 2014
Externally publishedYes
Event2014 GeoShanghai International Congress: GeoEnvironmental Engineering - Shanghai, China
Duration: 2014 May 262014 May 28

Publication series

NameGeotechnical Special Publication
Number241 GSP
ISSN (Print)0895-0563


Other2014 GeoShanghai International Congress: GeoEnvironmental Engineering

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology


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