Cellular lightweight concrete containing high-calcium fly ash and natural zeolite
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Author list: Jitchaiyaphum K., Sinsiri T., Jaturapitakkul C., Chindaprasirt P.
Publisher: Springer
Publication year: 2013
Journal: International Journal of Minerals, Metallurgy and Materials (1674-4799)
Volume number: 20
Issue number: 5
Start page: 462
End page: 471
Number of pages: 10
ISSN: 1674-4799
eISSN: 1869-103X
Languages: English-Great Britain (EN-GB)
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Abstract
Cellular lightweight concrete (CLC) with the controlled density of approximately 800 kg/m3 was made from a preformed foam, Type-I Portland cement (OPC), fly ash (FA), or natural zeolite (NZ), and its compressive strength, setting time, water absorption, and microstructure of were tested. High-calcium FA and NZ with the median particle sizes of 14.52 and 7.72 μm, respectively, were used to partially replace OPC at 0, 10wt%, 20wt%, and 30wt% of the binder (OPC and pozzolan admixture). A water-to-binder mass ratio (W/B) of 0.5 was used for all mixes. The testing results indicated that CLC containing 10wt% NZ had the highest compressive strength. The replacement of OPC with NZ decreased the total porosity and air void size but increased the capillary porosity of the CLC. The incorporation of a suitable amount of NZ decreased the setting time, total porosity, and pore size of the paste compared with the findings with the same amount of FA. The total porosity and cumulative pore volume decreased, whereas the gel and capillary pores increased as a result of adding both pozzolans at all replacement levels. The water absorption increased as the capillary porosity increased; this effect depended on the volume of air entrained and the type or amount of pozzolan. © 2013 University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.
Keywords
lightweight concrete, Water absorption, zeolites
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