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

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

doi:10.1061/9780784413432.023

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 proceeding › Conference contribution

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.

Original language	English
Title of host publication	GeoEnvironmental Engineering - Selected Papers from the Proceedings of the 2014 GeoShanghai International Congress
Publisher	American Society of Civil Engineers (ASCE)
Pages	222-231
Number of pages	10
Edition	241 GSP
ISBN (Print)	9780784413432
DOIs	https://doi.org/10.1061/9780784413432.023
Publication status	Published - 2014
Externally published	Yes
Event	2014 GeoShanghai International Congress: GeoEnvironmental Engineering - Shanghai, China Duration: 2014 May 26 → 2014 May 28

Publication series

Name	Geotechnical Special Publication
Number	241 GSP
ISSN (Print)	0895-0563

Other

Other	2014 GeoShanghai International Congress: GeoEnvironmental Engineering
Country/Territory	China
City	Shanghai
Period	14/5/26 → 14/5/28

ASJC Scopus subject areas

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

Access to Document

10.1061/9780784413432.023

Cite this

Inazumi, S., Sano, H., Yamada, M., & Shang, H. M. (2014). Availability of density measuring methods estimating gypsum hemihydrate content in reclaimed gypsums. In GeoEnvironmental Engineering - Selected Papers from the Proceedings of the 2014 GeoShanghai International Congress (241 GSP ed., pp. 222-231). (Geotechnical Special Publication; No. 241 GSP). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/9780784413432.023

Availability of density measuring methods estimating gypsum hemihydrate content in reclaimed gypsums. / Inazumi, Shinya; Sano, Hiroaki; Yamada, Mikio et al.

GeoEnvironmental Engineering - Selected Papers from the Proceedings of the 2014 GeoShanghai International Congress. 241 GSP. ed. American Society of Civil Engineers (ASCE), 2014. p. 222-231 (Geotechnical Special Publication; No. 241 GSP).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Inazumi, S, Sano, H, Yamada, M & Shang, HM 2014, Availability of density measuring methods estimating gypsum hemihydrate content in reclaimed gypsums. in GeoEnvironmental Engineering - Selected Papers from the Proceedings of the 2014 GeoShanghai International Congress. 241 GSP edn, Geotechnical Special Publication, no. 241 GSP, American Society of Civil Engineers (ASCE), pp. 222-231, 2014 GeoShanghai International Congress: GeoEnvironmental Engineering, Shanghai, China, 14/5/26. https://doi.org/10.1061/9780784413432.023

Inazumi S, Sano H, Yamada M, Shang HM. Availability of density measuring methods estimating gypsum hemihydrate content in reclaimed gypsums. In GeoEnvironmental Engineering - Selected Papers from the Proceedings of the 2014 GeoShanghai International Congress. 241 GSP ed. American Society of Civil Engineers (ASCE). 2014. p. 222-231. (Geotechnical Special Publication; 241 GSP). doi: 10.1061/9780784413432.023

Inazumi, Shinya ; Sano, Hiroaki ; Yamada, Mikio et al. / Availability of density measuring methods estimating gypsum hemihydrate content in reclaimed gypsums. GeoEnvironmental Engineering - Selected Papers from the Proceedings of the 2014 GeoShanghai International Congress. 241 GSP. ed. American Society of Civil Engineers (ASCE), 2014. pp. 222-231 (Geotechnical Special Publication; 241 GSP).

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

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