Metakaolin-based inorganic polymer composite: Effects of fine aggregate composition and structure on porosity evolution,microstructure and mechanical properties |
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| Affiliation: | 1. Department of Materials and Environmental Engineering, University of Modena and Reggio Emilia, Via Vignolese 905, 41125 Modena, Italy;2. M. Rinker School of Building and Construction, University of Florida, RNK304/115703, FL32611-5703 Gainesville, FL, USA;3. Department Werkstoffwissenschaften Lehrstuhl fur Glas Und Keramik, Universtat Erlangen-Nurnberg, Martensstr. 5, D-91058 Erlangen, Germany;4. Department of Civil, Environmental and Materials Engineering, University of Bologna, Via Terracini 28, 40131 Bologna, Italy;5. Department of Materials Engineering and Industrial Technologies, University of Trento, Via Mesiano 77, 38050 Trento, Italy;1. National Research and Development Institute for Chemistry and Petrochemistry-ICECHIM, Advanced Polymer Materials and Polymer Recycling Group, Splaiul Independentei No. 202, Bucharest, Romania;2. University “Politehnica” of Bucharest, Department of Bioresources and Polymer Science, Calea Victoriei No. 149, Bucharest, Romania;3. Institute of Physical Chemistry of the Romanian Academy “Ilie Murgulescu”, Splaiul Independentei No. 202, Bucharest, Romania;1. Department of Architectural Engineering, Kongju National University, South Korea;2. Department of Architectural Engineering, and Engineering Research Institute, Gyeongsang National University, South Korea;1. School of Civil Engineering, Sun Yat-sen University, Guangzhou 510275, China;2. Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, China;3. China University of Mining and Technology, Beijing, China;1. School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Pulau Pinang, Malaysia;2. Structural Materials Niche Area, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Pulau Pinang, Malaysia;3. Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia |
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| Abstract: | This paper examines the phase transformation, pore evolution, microstructural and mechanical changes that occur in inorganic polymer cement (IPC) in the presence of three different grade of fine aggregates (ф < 100 μm) of ladle slag, nepheline syenite and quartz sand. Experimental results indicate that polycondensation was enhanced in nepheline syenite based specimens, compared to quartz sand, due to the increase in H MAS phases in relation to the dissolution and interaction of amorphous/disordered fraction of aggregates. HCS and HCAS with HMAS phases were identified in the ladle slag based specimens. The formation of these new phases reduced both the cumulative pore volume and pores size. The apparent increase in volume of capillary pores in ladle slag based specimens was explained by the residual bubbles from the carbonates included in raw slag. The flexural strength of the inorganic polymer cement increases from 4 MPa to 4.2, 4.8 and 6.8 MPa with the addition of 20 wt% of quartz sand, nepheline syenite and ladle slag respectively. These values increase significantly between 28 and 180 days of curing (9.1 MPa for ladle slag and 10.0 MPa for nepheline syenite). It was concluded that fines can be used to remove the HM and poorly bounded alumina oligomers in metakaolin based inorganic polymer matrices and improve the interfacial zone for the design of an optimum grade and high-performance composites. |
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| Keywords: | Inorganic polymer Microstructure Pore size distribution Fines Flexural strength |
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