Effects of colloidal nanoSiO2 on fly ash hydration |
| |
| Authors: | Pengkun Hou Kejin Wang Jueshi Qian Shiho Kawashima Deyu Kong Surendra P. Shah |
| |
| Affiliation: | 1. College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China;2. Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL 60208, USA;3. Department of Civil, Construction and Environmental Engineering, Iowa State University, Ames, IA 50011, USA;4. College of Architecture and Civil Engineering, Zhejiang University of Technology, Hangzhou 310014, China;1. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China;2. Department of Civil Engineering, Qingdao Technological University (Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone), Qingdao, China;3. Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO, USA;1. Civil Engineering Faculty, K.N. Toosi University of Technology, No. 1346, Vali Asr Street, Mirdamad Intersection, Tehran, Iran;2. Department of Concrete technology, Building and Housing Research Center (BHRC), Pas Farhangian Street, Sheikh Fazlollah Exp. way, Tehran, Iran;1. Chemistry Department, Faculty of Science, Fayoum University, Fayoum, Egypt;2. Chemistry Department, College of Science, Al Imam Mohammad Ibn Saud, Islamic University (IMSIU), Riyadh, Saudi Arabia;3. Chemistry Department, Faculty of Science, Benha University, Benha, Egypt;4. Building Physics Institute BPI, Housing and Building National Research Center, HBRC, Dokki, Giza 11511, Egypt |
| |
| Abstract: | ![]()
The influences of colloidal nanoSiO2 (CNS) addition on fly ash hydration and microstructure development of cement–fly ash pastes were investigated. The results revealed that fly ash hydration is accelerated by CNS at early age thus enhancing the early age strength of the materials. However, the pozzolanic reaction of fly ash at later age is significantly hindered due to the reduced CH content resulting from CNS hydration and the hindered cement hydration, as well as due to a layer of dense, low Ca/Si hydrate coating around fly ash particles. The results and discussions explain why the cementitious materials containing nanoSiO2 had a lower strength gain at later ages. Methods of mitigating the adverse effect of nanoSiO2 on cement/FA hydration at later ages were proposed. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
