Stability of cenospheres in lightweight cement composites in terms of alkali–silica reaction

This paper presents an experimental study on characteristics and stability of cenospheres used in lightweight cement composites. ASTM C227 and C1260 tests were used to evaluate if cenospheres are potentially deleterious due to alkali–silica reaction (ASR). Natural sand was used as control. Examinati...

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Bibliographic Details
Published in:Cement and concrete research 2012-05, Vol.42 (5), p.721-727
Main Authors: Wang, Jun-Yan, Zhang, Min-Hong, Li, Wei, Chia, Kok-Seng, Liew, Richard J.Y.
Format: Article
Language:English
Subjects:
Alkali-silica reactions
Alkali–silica reaction (C)
ALUMINIUM COMPOUNDS
Aluminum tobermorite (D)
Applied sciences
BUILDING MATERIALS
Buildings. Public works
Cement composites (E)
CEMENTS
Cenosphere (D)
Cenospheres
CHEMICAL ANALYSIS
Concretes. Mortars. Grouts
DIFFRACTOMETERS
ELECTRON MICROSCOPY
Exact sciences and technology
EXPANSION
General (composition, classification, performance, standards, patents, etc.)
GRAVIMETRIC ANALYSIS
MATERIALS
MATERIALS SCIENCE
MEASURING INSTRUMENTS
MICROSCOPY
MINERALS
MORTARS
OXIDE MINERALS
Pozzolanic reaction (C)
QUANTITATIVE CHEMICAL ANALYSIS
REACTIVITY
SAND
SCANNING ELECTRON MICROSCOPY
SILICA
SPECTROSCOPY
STABILITY
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
Weight reduction
X-RAY DIFFRACTOMETERS
X-RAY SPECTROSCOPY
X-rays
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Summary:This paper presents an experimental study on characteristics and stability of cenospheres used in lightweight cement composites. ASTM C227 and C1260 tests were used to evaluate if cenospheres are potentially deleterious due to alkali–silica reaction (ASR). Natural sand was used as control. Examination by scanning electron microscope with energy-dispersive X-ray spectroscopy and analyses by X-ray diffractometer and thermogravimetry were conducted on samples with cenospheres after 9-month C227 and C1260 tests to better understand the behavior of cenospheres exposed to high alkaline environments and higher temperatures in these tests. Results indicate that cenospheres are not potentially deleterious due to ASR. Expansion of the mortar specimens tested to ASTM C227 and C1260 seems to be affected by the pozzolanic reactivity of cenospheres. Fine cenospheres showed limited pozzolanic reactivity at 28–30°C and 38°C, but exhibited significant pozzolanic reactivity at 80°C with aluminum tobermorite [Ca5Si5Al(OH)O17∙5H2O] identified as the main reaction product.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2012.02.010