Strength and microstructure of mortar containing nanosilica at high temperature

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The effect of high temperature on the mechanical properties and microstructure of nanosilica-incorporated mortars has been studied. Results show that the incorporation of nanosilica increases both compressive and flexural strengths significantly at both ambient and after a 2-hour exposure to 752°F (400°C) temperatures; the strengths increase with the increase of nanosilica content. A significant decrease in strength was recorded for all control and nanosilica-incorporated mortar specimens after a 2-hour exposure to 1292°F (700°C) heat; however, nanosilica-incorporated specimens show higher residual strength than those without nanosilica. Microstructural analysis shows that nanosilica reduces the calcium hydroxide crystals to produce more calcium silicate hydrate, the process that contributes to the strength and the residual strength of the material. In addition, the material exhibits a stable structure state up to 842°F (450°C), while exposure to higher temperatures results in a decomposition of hydration products.

Original languageEnglish
Pages (from-to)163-170
Number of pages8
JournalACI Materials Journal
Volume111
Issue number2
DOIs
Publication statusPublished - 2014

Fingerprint

Mortar
Microstructure
Silicic Acid
Calcium Hydroxide
Calcium silicate
Hydrated lime
Hydrates
Bending strength
Hydration
Temperature
Compressive strength
Decomposition
Mechanical properties
Crystals

Keywords

  • Compressive strength
  • Flexural strength
  • High temperature
  • Microstructure
  • Nanosilica
  • Residual strength

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)
  • Civil and Structural Engineering

Cite this

Strength and microstructure of mortar containing nanosilica at high temperature. / Ibrahim, Rahel Kh; Hamid, Roszilah; Taha, Mohd. Raihan.

In: ACI Materials Journal, Vol. 111, No. 2, 2014, p. 163-170.

Research output: Contribution to journalArticle

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