Leaching behaviour of Cs-134 immobilised in cement-biochar matrix

Zalina Laili, Muhamad Samudi Yasir, Mohd Abd Wahab Yusof

Research output: Contribution to journalArticle

Abstract

The leaching behavior of cesium -134 (Cs-134) from cement mixed with 5%, 11% and 18% of biochar has been investigated accordance with the ANSI/ANS 16.1-2003 method. The leachate was collected and measured using gamma spectrometry after the leaching periods of 2 h, 7 h, 24 h, 14 days, 28 days, 43 days and 90 days. In order to evaluate the leaching behavior of Cs-134 from cement biochar matrix, the cumulative leach fraction, leaching rate, diffusion coefficient and leachability index for Cs-134 were calculated. The compressive strength of the specimen after 90 days of leaching test was also performed to evaluate its durability in the water. The results indicated that the addition of biochar affects the leaching behavior of Cs-134 from the cement matrix. The optimum amount of biochar required to obtain the lowest leachability and the highest compressive strength of Cs-134 was found to be at 11%. The leaching of Cs-134 from cement-biochar matrix was found less than 20%, in which the leaching behavior approximates that of a semi-infinite medium. The leachabilty indices of all specimens were above the recommend minimum value of 6, which suggest the leaching behavior of Cs-134 from cement-biochar matrix occurred in a very slow diffusion.

Original languageEnglish
Pages (from-to)59-67
Number of pages9
JournalJurnal Teknologi
Volume78
Issue number7
DOIs
Publication statusPublished - 1 Jul 2016

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Cesium
Leaching
Cements
Compressive strength
Spectrometry
Durability

Keywords

  • Biochar
  • Cement
  • Cesium-134
  • Leaching behavior

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Leaching behaviour of Cs-134 immobilised in cement-biochar matrix. / Laili, Zalina; Yasir, Muhamad Samudi; Yusof, Mohd Abd Wahab.

In: Jurnal Teknologi, Vol. 78, No. 7, 01.07.2016, p. 59-67.

Research output: Contribution to journalArticle

Laili, Zalina ; Yasir, Muhamad Samudi ; Yusof, Mohd Abd Wahab. / Leaching behaviour of Cs-134 immobilised in cement-biochar matrix. In: Jurnal Teknologi. 2016 ; Vol. 78, No. 7. pp. 59-67.
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