Effect of sodium silicate- and ethyl silicate-based nano-silica on pore structure of cement composites |
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| Affiliation: | 1. Architectural Technology Research Team, Daewoo Institute of Construction Technology, 60 Songjuk-Dong, Jangan-Gu, Suwon 440-210, Republic of Korea;2. Fire Research Center, Korea Institute of Construction Technology, Hwaseong 445-861, Republic of Korea;3. Department of Architecture & Interior Design, Woosuk University, Samnye-Eup, Wanju-Gun 565-701, Republic of Korea;4. Korea Conformity Laboratories Daejeon & Chungnam Testing Lab., 60-4 Jang-Dong, Yuseong-Gu, Daejeon 305-343, Republic of Korea;1. School of Civil Engineering, Chongqing University, Chongqing 400045, China;2. Key Laboratory of New Technology for Construction of China in Mountainous Area, Chongqing University, Chongqing 400030, China;1. Department of Materials, Energy Science and Engineering, The Nelson Mandela Institution of Science and Technology, P.O. Box 447, Arusha, Tanzania;2. Department of Built Environment Engineering, Mbeya University of Science and Technology, P.O. Box 131, Mbeya, Tanzania;3. Department of Structural and Construction Engineering, University of Dar es Salaam, P.O. Box 35131, Dar es Salaam, Tanzania;4. Department of Chemical and Forensic Sciences, Botswana University of Science and Technology, Private Bag 16, Palapye, Botswana;5. Department of Chemistry, South Eastern Kenya University, P.O. Box 170-90200 Kitui, Kenya;1. Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology, Mianyang, 621010, China;2. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, 621010, China;3. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, China;1. School of Materials Science & Engineering, University of Jinan, Jinan, Shandong 250022, China;2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, Jinan, Shandong 250022, China;3. Technical Supervision and Research Center of the Building Materials Industry, Beijing 100024, China;4. Department of Civil & Environmental Engineering, Northwestern University, Evanston, IL 60201, USA |
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| Abstract: | This study proposes using sodium silicate-based nano-silica (SS) in cement composites. The effect of the addition of the proposed nano-silica on cement composites was compared to that of conventional ethyl silicate-based nano-silica (ES) and silica fume (SF). This study found that the inclusion of SS in cement composites has mainly two effects on their properties: one is a fast pozzolanic reaction, and the other is a pore-filling effect in a cement matrix. As a result, SS dramatically improves the early-age strength of cement composites by up to 184% and 152%, compared to a control specimen and the specimen with ES inclusion, respectively. Calorimetry, X-ray diffraction (XRD), scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP) tests were conducted to monitor the effects of these nano-silicas. |
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| Keywords: | Nano-silica Silica fume Cement composites Pore structure Compressive strength |
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