Impacts of elevated temperatures on the strength and microstructure of cement mortars containing silica fume

This research investigated the influence of elevated temperatures on the strength and micro structure of cement mortars containing silica fume (SF). The cement mortars were substituted with three different weight percents (2%, 4% and 6%) of silica fume and the prepared samples were exposed to elevat...

Full description

Saved in:
Bibliographic Details
Main Authors: Albeer, Shahad, Hassn, Maan
Format: Conference Proceeding
Language:English
Subjects:
Compressive strength
High temperature
Microstructure
Mortars (material)
Physical properties
Silica fume
Slaked lime
Thermogravimetric analysis
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This research investigated the influence of elevated temperatures on the strength and micro structure of cement mortars containing silica fume (SF). The cement mortars were substituted with three different weight percents (2%, 4% and 6%) of silica fume and the prepared samples were exposed to elevated temperatures of 250 °C, 450 °C, 600 °C and 900 °C. After cooling, the compressive strength, microstructure, and any changes in chemical and physical properties were determined using scanning electron microscopy, X-ray diffraction, and thermogravimetric analysis. Silica fume was found to reduce the size and density of micro cracks, reduce the prevalence of calcium hydroxide components, and improve compressive strength. As a consequence, an ideal silica fume ratio, favourable for enhancing high temperatures resistance of cement mortars, was identified at 4 wt.% replacement.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0207573