Surface modified microcrystalline cellulose from cotton as a potential mineral admixture in cement mortar composite |
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| Affiliation: | 1. Department of Civil Engineering, IIT Madras, Chennai 600 036, India;2. Department of Chemistry, IIT Madras, Chennai 600 036, India;1. Department of Civil and Environmental Engineering, Tennessee Technological University, 1020 Stadium Drive, Box 5015, Cookeville, TN 38505-0001, USA;2. Smith Seckman Reid, Inc., 2995 Sidco Drive, Nashville, TN 37204, USA;1. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0355, United States;2. School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, South Korea;3. Department of Civil and Environmental Engineering, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, South Korea;1. Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China;2. School of Materials Science and Engineering, Tongji University, Shanghai 201804, China;3. Department of Engineering, Aarhus University, Aarhus 8000, Denmark;4. Shanghai Construction and Building Materials Market Supervision Station, Shanghai 200032, China;1. School of Engineering, Universidad Pontificia Bolivariana, Medellín, Colombia;2. Universidad de Buenos Aires, Facultad de Ingeniería, Buenos Aires, Argentina;3. Instituto de Tecnología de Polímeros y Nanotecnología (ITPN), Universidad de Buenos Aires/CONICET, Buenos Aires, Argentina;1. Department of Civil Engineering, University of Minho, Campus de Azurem, 4800-058, Guimaraes, Portugal;2. School of Engineering, University of Minho, Campus de Azurem, 4800-058, Guimaraes, Portugal;1. Oregon State University, Corvallis, OR, United States;2. USDA-Forest Service, Madison, WI, United States;3. Georgia Institute of Technology, Atlanta, GA, United States;4. Purdue University, West Lafayette, IN, United States |
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| Abstract: | The objective of the work is to examine the performance of tetraethyl orthosilicate (TEOS) modified microcrystalline cellulose (MCC) fiber, derived from cotton, as a mineral admixture that could be compatible in cement mortar composites. The effectiveness of surface modification of MCC is characterized by powder X-ray diffraction, FTIR, TGA and SEM techniques. The present silane based surface modifier (TEOS) minimizes the water uptake and acts as a pozzolan, that could result in additional calcium silicate hydrates (C-S-H) linkages. This is reflected by the enhancement in the mechanical properties of the cement mortar composite. A dramatic two fold enhancement of flexural strength and almost 45% increase of compressive strength are observed in the case of TEOS-MCC when compared with the cement mortar composites without any mineral admixture there by validating the method chosen. The enhancement of compressive and flexural strength could be due to proper dispersion of smaller size MCC fibers within the pores of the cement mortar composite. When an optimized amount of chemical admixture (polycarboxylate ether (PCE) superplasticizer) is used along with TEOS- MCC a greater enhancement in flexural strength and compressive strength is observed with good workability, at a lower water/cement ratio. |
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| Keywords: | Microcrystalline cellulose Surface modification Tetraethyl orthosilicate Stӧber silica Admixture Superplasticizer Cement mortar Strength enhancement |
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