Affiliation:
1. Institute for Testing of Materials - IMS, Belgrade, Serbia
2. Institute for Technology of Nuclear and other Mineral Raw Materials, Belgrade, Serbia
Abstract
This experimental study was conducted with an aim to investigate the effect
of the elevated temperature on the mineral phase composition, microstructure
and mechanical properties of the thermal insulation lightweight concretes.
The first group of experimental concretes was based on the expanded
vermiculite and expanded perlite used as lightweight aggregates (in 65 wt%)
in combination with either ordinary Portland cement or refractory calcium
aluminate cement. The mix-design of the second group of concretes comprised
standard quartz aggregate, vermiculite or perlite as aggregate replacement
(25 wt%) and binder (PC or CAC). A total of 10 concrete mix-designs were
fabricated in form of 40?40?160 mm samples which were submitted to
heat-treatment at 400?, 600?, 800? and 1000?C upon standard 28-days period
of curing and hardening. The changes in crystallinity and mineral phase
composition induced by temperature were monitored by X-ray diffraction
technique. Microstructural visualizations of the non-fired and fired
concrete samples were conducted by scanning electron microscopy accompanied
with EDX analysis. The results indicated that despite the decrease in
compressive strengths upon firing, investigated lightweight concretes can be
categorized both as thermal insulators and structural materials.
Publisher
National Library of Serbia
Subject
Materials Chemistry,Metals and Alloys,Condensed Matter Physics,Ceramics and Composites
Cited by
6 articles.
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