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Green lightweight cementitious composite incorporating aerogels and fly ash cenospheres - Mechanical and thermal insulating properties
Hanif A.; Diao S.; Lu Z.; Fan T.; Li Z.
2016-07-30
Source PublicationConstruction and Building Materials
ISSN09500618
Volume116Pages:422-430
AbstractThe research focused on the development of an ultra-lightweight cementitious composite with both excellent mechanical and thermal insulating properties. Fly ash cenosphere (FAC), and aerogel, a nano-structured highly porous material made of silica, were used as lightweight aggregates. Polyvinyl alcohol fibers were used to improve the mechanical behavior of the cementitious composite. The experimental results showed higher specific strength (up to 18 kPa/kg m) of the resulting composites as compared to conventional lightweight materials. Depending on the amount of FAC and aerogel, the compressive and flexural strengths of the cementitious composite were found as 23.54-18.63 MPa and 4.94-3.66 MPa, respectively, while the thermal conductivity was reduced to 0.3197 W/m-K. Moreover, the hydration products and microstructures of the FAC/aerogel modified cementitious composite were investigated by the Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy (EDS). Thermal stability of the hardened matrix was studied by using thermo-gravimetric analyses and it was revealed that the composites were fairly stable at a high temperature range. The weight loss varied with increasing aerogel content. In conclusion, both FAC and aerogel are excellent candidates for producing mechanically strong as well as thermally insulated composites which have great potential to be used in buildings for energy conservation.
KeywordAerogel Cementitious composite Fly ash cenosphere Lightweight Sustainable development Thermal conductivity
DOI10.1016/j.conbuildmat.2016.04.134
URLView the original
Language英語
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Cited Times [WOS]:45   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
AffiliationHong Kong University of Science and Technology
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Hanif A.,Diao S.,Lu Z.,et al. Green lightweight cementitious composite incorporating aerogels and fly ash cenospheres - Mechanical and thermal insulating properties[J]. Construction and Building Materials,2016,116:422-430.
APA Hanif A.,Diao S.,Lu Z.,Fan T.,&Li Z..(2016).Green lightweight cementitious composite incorporating aerogels and fly ash cenospheres - Mechanical and thermal insulating properties.Construction and Building Materials,116,422-430.
MLA Hanif A.,et al."Green lightweight cementitious composite incorporating aerogels and fly ash cenospheres - Mechanical and thermal insulating properties".Construction and Building Materials 116(2016):422-430.
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