Hardening performance of reclaimed gypsums for stabilizing agent to improve soft clayey ground

ORIGINAL ARTICLE
  • 44 Downloads

Abstract

For a prospective solution of effective recycling of gypsum board wastes, the present study was conducted to evaluate applicability of reclaimed gypsum as stabilizing agent for improvement of soft clayey ground. A series of unconfined compression tests and needle penetration tests were conducted to understand the fundamental properties of reclaimed gypsum and gypsum treated soils and the durability in water. An important finding was strength decrease in relation to mixing time of gypsum and soil. This may attribute to excessive mixing that caused breakage of the promptly hardened gypsum treated clay. In addition, from sounding and laboratory tests on the stabilized ground by shallow mixing method with different execution conditions, it was found that the strength of stabilized ground appeared in an early stage and that the hardening effect of cement that was used in combination with gypsum continued in a longer period. Regarding an environmental aspect, a specific amount of cement could have restrained leaching fluorine satisfactorily under the standard level in the field by adopting suitable mixing proportions based on the laboratory mixing test results. For practical application, the mixing procedure was a major factor of strength growth when hemihydrate gypsum was used to stabilize soft clayey ground.

Keywords

Reclaimed gypsum Soil stabilization Stabilizing agent Needle penetration Field execution test 

References

  1. 1.
    Gypsum Board Association of Japan (2014) Gypsum board handbook. http://www.gypsumboard-a.or.jp/pdf/Tableofcontents.pdf. Accessed 16 Dec 2016
  2. 2.
    Kamei T, Horai H (2009) Development of solidification technology for fluorine contaminated bassanite using Portland blast-furnace (B) cement. J Jpn Geotech Soc 4(1):91–98CrossRefGoogle Scholar
  3. 3.
    Ahmed A, Ugai K, Kamei T (2011) Laboratory and field evaluations of recycled gypsum as a stabilizer agent in embankment construction. J Soils Found 51(6):975–990CrossRefGoogle Scholar
  4. 4.
    Kamei T, Ahmed A, Ugai K (2013) Durability of soft clay soil stabilized with recycled bassanite and furnace cement mixture. J Soils Found 53(1):155–165CrossRefGoogle Scholar
  5. 5.
    Kamei T, Ahmed A, Horai H, Ugai K (2015) A novel solidification technique for fluorine-contaminated bassanite using waste materials in ground improvement applications. J Mater Cycles Waste Manag 17:380–390CrossRefGoogle Scholar
  6. 6.
    Inazumi S, Sano H, Yamada M (2016) Estimation of gypsum hemihydrate content in recycled gypsums derived from gypsum boards. J Mater Cycles Waste Manag 18:168–176CrossRefGoogle Scholar
  7. 7.
    Sano H, Yamada M, Kotake N, Inazumi S, Kuwajima K (2016) Proposal of estimating equations on water content of stabilized soils by reclaimed gypsums. J Jpn Geotech Soc 10(4):603–610 (in Japanese) CrossRefGoogle Scholar
  8. 8.
    Maruto Co. Ltd. (2006) Penetrometer for soft rock: model SH-70. Maruto Corporation, Tokyo, Japan. http://www.maruto-group.co.jp/menu_2/post-105.html. Accessed 16 Dec 2016
  9. 9.
    Japan Society of Civil Engineers (JSCE) (1991) Proposed testing methods for soft rock. Committee on rock mechanics of JSCE, JapanGoogle Scholar
  10. 10.
    Japanese Geotechnical Society (JGS) (2004) Method for engineering classification of rock mass (JGS: 3811–2004). JGS Publication, Tokyo, Japan, pp 1–6Google Scholar
  11. 11.
    Murakami N, Kotake N, Ochi Y (2013) A study on the stabilizing effects of solidification agent using reclaimed gypsum. In: Proceedings of 19th conference of JSCE Shikoku-branch, pp 175–176Google Scholar
  12. 12.
    Kotake N, Kawano K, Matsushita K (2014) Field test of stabilizing sediment by reclaimed gypsum. In: 25th annual conference, material cycles and waste management, pp 147–148Google Scholar
  13. 13.
    Marui Co. Ltd. (2013). Portable bearing tester CASPFOL. http://www.marui-group.co.jp/en/products/items2_4/item2_4_3/ Accessed 16 Dec 2016

Copyright information

© Springer Japan KK 2017

Authors and Affiliations

  1. 1.Department of Civil Engineering, National Institute of TechnologyKagawa CollegeTakamatsuJapan
  2. 2.Department of Civil and Environmental Engineering, National Institute of TechnologyOita CollegeOitaJapan

Personalised recommendations