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Continuous monitoring for leaching of calcium sulfoaluminate cement pastes incorporated with ZnCl 2 under the attacks of chloride and sulfate

Tang, Shengwen (author)
Wuhan University
Yuan, Junhui (author)
Wuhan University
Cai, Rongjin (author)
Wuhan University
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Wei, Xuanchun (author)
Wuhan University
Zhao, Cheng (author)
Wuhan University
Cai, Xinhua (author)
Wuhan University
He, Zhen (author)
Wuhan University
Chen, Teresa E, 1988 (author)
Hong Kong University of Science and Technology,Chalmers tekniska högskola,Chalmers University of Technology
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 (creator_code:org_t)
Elsevier BV, 2019
2019
English.
In: Chemosphere. - : Elsevier BV. - 0045-6535 .- 1879-1298. ; 223, s. 91-98
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Ionic zinc is considered as an environmental pollutant. This work systematically investigated leaching mechanisms of calcium sulfoaluminate cement (CSA) pastes incorporated with/without ZnCl 2 under the attacks of chloride and/or sulfate. The leaching behaviors of CSA pastes in the leaching solution are in-situ and continuously monitored by innovative non-contact electrical impedance measurement (NCEIM) and pH meter. The dissolution and diffusion during the leaching process are experimentally identified. Other techniques are also performed to verify the finding of NCEIM: the ion chromatograph and inductively coupled plasma optical emission spectrometer reveal the leaching or decomposition sequence of CSA pastes during the leaching process. Besides, results from XRD and SEM techniques demonstrate that main solid products in CSA pastes are ettringite and calcium monosulfoaluminate hydrates. The incorporation of Zn in the pastes has great impact on the decomposition of CSA pastes in the temperature elevation. External chloride and/or sulfate attacks significantly alter the pore structure of CSA pastes during the leaching process.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Keramteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Ceramics (hsv//eng)
TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Byggproduktion (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Construction Management (hsv//eng)
NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)

Keyword

Calcium sulfoaluminate cement
Electrical impedance
Sulfate
Chloride
Zinc
Leaching

Publication and Content Type

art (subject category)
ref (subject category)

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