Characteristics of Cement Mortar with Nano-SiO2 Particles

A pozzolan's major component, amorphous or glassy silica, reacts with calcium silicate hydration-formed calcium hydroxide. Amount of reaction-available surface area is proportional to pozzolanic reaction rate, so adding nano-SiO2 (NS) particles to make high-performance concrete is plausible. The authors evaluated cement mortar compressive strengths at various water-cementitious material ratios (w/cm). 0.23, 0.25, 0.32, 0.35, and 0.48 were the five different w/cm used, and 3, 6, 9, and 12% by cement weight were the NS content percentages. With the addition of silica fume, cement mortar compressive strengths were also evaluated with a 0.35 w/cm for comparison with nano-SiO2 particle containing mortar and silica fume contents of 5, 10, and 15% by cement weight. Compressive strengths of mortars with NS were shown in experimental results to all be higher than those of 7 and 28 day silica fume containing mortars. That nano-particles proved more valuable in strength enhancement than silica fume was demonstrated. The authors also analyze some available continuous hydration progress monitoring examinations, such as heat evolution rate, Ca(OH)2 residual quantity test, and SEM observation. Examination results indicate that in nano scale the SiO2 improve the microstructure by acting as a filler, and also promote pozzolanic reaction by acting as an activator.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/13846872
• Authors:
  • Jo, Byung-Wan
  • Kim, Chang-Hyun
  • Lim, Jae-Hoon
• Publication Date: 2007

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 404-407
• Serial:
  • ACI Materials Journal
  • Volume: 104
  • Issue Number: 4
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0889-325X
  • Serial URL: https://www.concrete.org/publications/acimaterialsjournal.aspx

Subject/Index Terms

• TRT Terms: Calcium hydroxide; Cement; Cement mortars; Compressive strength; High performance concrete; Hydration; Microstructure; Monitoring; Nanostructured materials; Pozzolan; Silica fume; Silicon dioxide
• Uncontrolled Terms: Amorphous silica; Characteristics; Enhancements
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01055419
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 23 2007 1:00PM