Experimental Study of Effect of Fly Ash on Self-Compacting Rammed Earth Construction Stabilized with Cement-Based Composites
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 7
Abstract
As an environmentally friendly construction technique, modern rammed earth generally stabilized with portland cement has attracted growing interest recently. In this study, cement-based composites (CSCN) consisting of cement, sodium silicate, and composite promoter were used for substituting portland cement, and the effect of fly ash was investigated by unconfined compressive strength (UCS) test, thermogravimetric analysis (TG), X-ray diffraction (XRD), and scanning electron microscope (SEM). Based on the theory of pozzolanic and dispersing (P&D) effects, the contribution of fly ash was regarded as an addition of CSCN, and the quantitative analysis of P&D effects defined as P&D factors was evaluated by the clay-water/CSCN ratio hypothesis. It was found that the P&D factors for both compressive strength and secant modulus varied with CSCN content and curing age. The models of different curing ages for predicting the strength and modulus of specimens stabilized with CSCN and fly ash were developed from the combination of P&D factors and clay-water/CSCN ratio. The precisions of P&D factors and prediction models were verified by comparing predicted results and experimental results, and the deviation was mostly within 10%. The mineralogical and microstructural analyses confirmed that the combination of pozzolanic and dispersing effect hypothesis could be appropriate to study the fly ash effects.
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Acknowledgments
This research work was financially supported by the National Natural Science Foundation of China, Grant No. 51378309 and 51379122.
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 7 • July 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: May 12, 2015
Accepted: Oct 28, 2015
Published online: Jan 20, 2016
Discussion open until: Jun 20, 2016
Published in print: Jul 1, 2016
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