Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 184, Issue -, Pages 68-75Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.06.162
Keywords
Alkali-activated material; Ground granulated blast furnace slag; Phosphogypsum; Naturally occurring radionuclide material; Radon exhalation; Building material
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Funding
- fund for scientific research Flanders (FWO)
- University of Leuven
- COST Action [TU1301]
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This study evaluates the immobilization potential of Rn-222 in alkali-activated materials (AAMs) based on ground granulated blast furnace slag (GGBFS). As radon source, 10 wt% phosphogypsum (PG) was added to evaluate PG reuse via AAMs. Matrix properties were modified by varying alkali activator's SiO2/Na2O and H2O/Na2O ratios. During hardening of AAMs, radon release occurs in three stages resulting, after 30 h, to 0.26 Bq/(kg(*)h). By varying the alkali-activator, massic exhalation for hardened samples decreased down to 0.01 Bq/(kg(*)h). Radon release was successfully reduced mainly by physical encapsulation, with best results being achieved by adjusting the alkali-activator to SiO2/Na2O = 0.75 and H2O/Na2O = 20. (C) 2018 Elsevier Ltd. All rights reserved.
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