Fiber reinforced mortar affected by alkali-silica reaction: A study by synchrotron microtomography |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, Pennsylvania State University, 3127 Research Drive, State College, PA, 16801, USA;2. Department of Civil and Environmental Engineering, Pennsylvania State University, 231M Sackett Building, University Park, State College, PA, 16802, USA;1. CIC, Commission of Scientific Research, Department of Civil Engineering, La Plata National University, La Plata, Argentina;2. CONICET, National Council of Scientific and Technological Research, Department of Civil Engineering, La Plata National University, La Plata, Argentina;3. LEMIT, 52 e/121 y 122, B1900AYB, La Plata, Pcia. de Buenos Aires, Argentina;1. Civil and Construction Engineering, Oregon State University, Corvallis, United States;2. Civil, Architectural and Environmental Engineering, University of Texas at Austin, Austin, United States;3. SES Group and Associates, Turner-Fairbank Highway Research Center, McLean, VA, United States;4. American Engineering Testing, Inc., St Paul, MN, United States;5. Federal Highway Administration (Retired), Washington DC, United States |
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| Abstract: | Alkali-Silica reaction (ASR) is a physicochemical process that can deteriorate concrete and is a recurring engineering problem. In this study three different cylindrical samples affected by ASR were prepared: a plain mortar and two composite mortars containing fibers (polypropylene and a polymer hybrid), which were analyzed at the microtomography (μCT) beamline 8.3.2 at the Advanced Light Source (ALS). In general, three different features were observed during the 136 day observation period: (1) aggregate dissolution, (2) crack propagation from inside the aggregate, through the cement matrix, and at the ITZ, and (3) the alkali-silica gel filling cracks and voids. In addition, accelerated mortar bar tests were utilized to observe ASR's expansive effect in the plain and composite mortars, and the fibers' ability to restrain expansion due to ASR. |
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| Keywords: | ASR Alkali-silica reaction Synchrotron tomography Polymer fiber Mortar Crack formation |
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