TY - JOUR
T1 - Performance of recycled soda-lime glass powder in mitigating alkali-silica reaction
AU - Shafaatian, Seyed M.H.
AU - Wright, Jared R.
AU - Rajabipour, Farshad
N1 - Funding Information:
The authors gratefully acknowledge the financial support from the National Science Foundation (NSF) under Award Number CMMI 1030708 and Career Award Number 1254333, both granted to the third author. Any opinions, findings, conclusions or recommendations expressed in this paper are those of the authors solely and do not necessarily reflect the views of NSF. The authors also wish to thank Mr Dan Fura and the teams at Citel and the Material Characterization Laboratory of Penn State. The authors also thank Mr William Shaker for supplying glass powders SLGP1 and SLGP2 and Ms Carole Anne MacDonald of the Ministry of Transportation in Ontario, Canada, for providing them with ample amounts of Spratt aggregate.
PY - 2018/7/25
Y1 - 2018/7/25
N2 - Recycled soda-lime glass powder (SLGP) is a valuable supplementary cementitious material. However, it has a high alkali content, and its effectiveness in mitigating the alkali-silica reaction (ASR) is uncertain. In this study, the ASR performance of SLGP was evaluated using the accelerated mortar bar test (ASTM C 1567) and the concrete prism test (ASTM C 1293). It was determined that a sufficient dosage of SLGP can mitigate ASR according to ASTM C 1567, and that finer SLGP is more effective. Meanwhile, the 2-year concrete prism test showed that the same type, fineness and dosage of glass powder as tested by C 1567 does reduce ASR, but not sufficiently and below the ASTM failure threshold. Pore fluid composition monitoring revealed that SLGP, over time, serves as a net contributor to the pore solution alkalinity, but these alkalis are released slowly. Overall, SLGP can reduce ASR, albeit insufficiently and temporarily. This ASR reduction is likely through a combination of reduced pore solution pH at early ages (due to cement dilution) and reduced portlandite content and transport properties at later ages (due to pozzolanic reaction). Long-term ASR testing is necessary to determine if and at what dosage a glass pozzolan may be able to control ASR sufficiently.
AB - Recycled soda-lime glass powder (SLGP) is a valuable supplementary cementitious material. However, it has a high alkali content, and its effectiveness in mitigating the alkali-silica reaction (ASR) is uncertain. In this study, the ASR performance of SLGP was evaluated using the accelerated mortar bar test (ASTM C 1567) and the concrete prism test (ASTM C 1293). It was determined that a sufficient dosage of SLGP can mitigate ASR according to ASTM C 1567, and that finer SLGP is more effective. Meanwhile, the 2-year concrete prism test showed that the same type, fineness and dosage of glass powder as tested by C 1567 does reduce ASR, but not sufficiently and below the ASTM failure threshold. Pore fluid composition monitoring revealed that SLGP, over time, serves as a net contributor to the pore solution alkalinity, but these alkalis are released slowly. Overall, SLGP can reduce ASR, albeit insufficiently and temporarily. This ASR reduction is likely through a combination of reduced pore solution pH at early ages (due to cement dilution) and reduced portlandite content and transport properties at later ages (due to pozzolanic reaction). Long-term ASR testing is necessary to determine if and at what dosage a glass pozzolan may be able to control ASR sufficiently.
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U2 - 10.1680/jgrma.18.00032
DO - 10.1680/jgrma.18.00032
M3 - Article
AN - SCOPUS:85076016805
VL - 7
SP - 28
EP - 39
JO - Green Materials
JF - Green Materials
SN - 2049-1220
IS - 1
ER -