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Nanomechanical Properties of Geopolymer/Cement Matrix in Recycled Aggregate Concrete

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The numerical simulation of concrete at small scales often requires the knowledge of the mechanical properties of the constitutive phases. To obtain more information to serve as the inputs in numerical simulation, an experimental investigation was conducted to characterize the nanomechanical properties of geopolymer/cement matrix in full-green recycled aggregate concrete (RAC). A two-step mixing procedure was applied to prepare RAC samples. Two water/cement (w/c) ratios were employed for the geopolymeric RAC (GRAC) to investigate the influence of the w/c ratio on nanomechanical properties of geopolymer matrix in RAC. By the grid nanoindentation technique, it was found that the geopolymer matrix in GRAC has an elastic modulus of 13.54 GPa and 10.38 GPa for the w/c ratio of 0.4 and 0.45, respectively. The cement matrix in the RAC (w/c ratio of 0.5) has an elastic modulus of 20.38 GPa.
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Keywords: Cement; Geopolymer; Nanoindentation; Recycled Aggregate Concrete

Document Type: Research Article

Affiliations: 1: Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge 70803, United States 2: Department of Civil and Architecture Engineering, Changsha University of Science and Technology, Changsha 410076, China

Publication date: January 1, 2019

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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