Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 238, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.117683
Keywords
Low clinker cement; Superfine blast furnace slag; Nano silica; Mechanical strength; Hydration; Pore structure
Categories
Funding
- National Natural Science Foundation of China [51572207, 51808420]
- Fundamental Research Funds for the Central Universities [WUT: 2019IVB058]
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Substituting part of cement clinker with superfine blast furnace slag (SFBFS) is a wonderful way to solve the problems of environmental pollution and resource consumption caused by cement manufacture. In this study, a low clinker cement containing high volume SFBFS was prepared with nano silica (NS) for property improving. The low clinker cement containing no more than 70% SFBFS exhibited higher mechanical strength than plain cement. At 90 d, the compressive and flexural strength of low clinker cement containing 70% SFBFS were 9.8% and 27.3% higher than that of plain cement. The hydration exothermic action of low clinker cement were significantly decreased, in comparison to plain cement. The results of X-ray powder diffraction and thermogravimetric analysis revealed that SFBFS was involved in the pozzolanic reaction, resulting in the consumption of CH and the production of C-S-H. The result of mercury intrusion porosimetry demonstrated that the incorporation of SFBFS refined the pore structure of blended cement pastes. In addition, NS played an important role in improving the mechanical strength, promoting the hydration and modifying the pore structure of low clinker cement blended with SFBFS. (C) 2019 Elsevier Ltd. All rights reserved.
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