The role of residual cracks on alkali silica reactivity of recycled glass aggregates
Publication: Research - peer-review › Journal article – Annual report year: 2011
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The role of residual cracks on alkali silica reactivity of recycled glass aggregates. / Maraghechi, Hamed; Shafaatian, Seyed-Mohammad-Hadi; Fischer, Gregor; Rajabipour, Farshad.
In: Cement and Concrete Composites, Vol. 34, No. 1, 2012, p. 41-47.Publication: Research - peer-review › Journal article – Annual report year: 2011
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TY - JOUR
T1 - The role of residual cracks on alkali silica reactivity of recycled glass aggregates
AU - Maraghechi,Hamed
AU - Shafaatian,Seyed-Mohammad-Hadi
AU - Fischer,Gregor
AU - Rajabipour,Farshad
PY - 2012
Y1 - 2012
N2 - Despite its environmental and economical advantages, crushed recycled glass has limited application as concrete aggregates due to its deleterious alkali-silica reaction. To offer feasible mitigation strategies, the mechanism of ASR should be well understood. Recent research showed that unlike some natural aggregates, soda-lime glass undergoes ASR within cracks in the interior of glass particles and not at glass–paste interface. These cracks originate during bottle crushing and propagate further by ASR. This paper examines whether glass aggregates could become innocuous if these cracks are healed by annealing or when the crack widths are smaller than a critical size. The results confirm that glass annealed at 650°C for 40min or particles containing cracks smaller than approximately 2.5μm can be considered innocuous based on ASTM C1260. Also larger glass particles contain significantly higher percentages of reactive microcracks which may explain why ASR expansions are lowered by reducing the size of glass aggregates.
AB - Despite its environmental and economical advantages, crushed recycled glass has limited application as concrete aggregates due to its deleterious alkali-silica reaction. To offer feasible mitigation strategies, the mechanism of ASR should be well understood. Recent research showed that unlike some natural aggregates, soda-lime glass undergoes ASR within cracks in the interior of glass particles and not at glass–paste interface. These cracks originate during bottle crushing and propagate further by ASR. This paper examines whether glass aggregates could become innocuous if these cracks are healed by annealing or when the crack widths are smaller than a critical size. The results confirm that glass annealed at 650°C for 40min or particles containing cracks smaller than approximately 2.5μm can be considered innocuous based on ASTM C1260. Also larger glass particles contain significantly higher percentages of reactive microcracks which may explain why ASR expansions are lowered by reducing the size of glass aggregates.
KW - Annealing
KW - Recycled glass
KW - Crack
KW - Alkali-silica reaction
KW - Scanning electron microscope
U2 - 10.1016/j.cemconcomp.2011.07.004
DO - 10.1016/j.cemconcomp.2011.07.004
M3 - Journal article
VL - 34
SP - 41
EP - 47
JO - Cement and Concrete Composites
T2 - Cement and Concrete Composites
JF - Cement and Concrete Composites
SN - 0958-9465
IS - 1
ER -