Journal
CEMENT AND CONCRETE RESEARCH
Volume 34, Issue 6, Pages 1043-1049Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2003.11.013
Keywords
nano-SiO2; high-performance concrete; compressive strength; pore size distribution
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This paper presents a laboratory study on the properties of high-volume fly ash high-strength concrete incorporating nano-SiO2 (SHFAC). The results were compared with those of control Portland cement concrete (PCC) and of high-volume fly ash high-strength concrete (HFAC). Assessments of these concrete mixes were based on short- and long-term performance. These included compressive strength and pore size distribution. Significant strength increases of SHFAC compared to the high-volume fly ash high-strength were observed as early as after 3 days curing, and improvements in the pore size distribution of SHFAC were also observed. In this work, the hydration heat of nano-SiO2 fly ash cement systems was also studied in comparison to the fly ash-cement systems and to the pure cement systems. In addition, the weight change of fly ash incorporating nano-SiO2, fly ash, and nano-SiO2 alone after immersed in saturated lime solution was also studied. (C) 2004 Elsevier Ltd. All rights reserved.
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