Volume 4, Issue 2, March 2016, Page: 6-16
Hydration Behavior of Composite Cement Containing Fly Ash and Nanosized-SiO2
H. El-Didamony, Chemistry Department, Faculty of Science, Zagazig University, Zagazig Egypt
S. Abd El-Aleem, Chemistry Department, Faculty of Science, Fayoum University, Fayoum, Egypt
Abd El-Rahman Ragab, Quality Department, Lafarge Cement, El Kattamia, El Sokhna, Suez, Egypt
Received: Feb. 11, 2016;       Accepted: Feb. 28, 2016;       Published: Mar. 17, 2016
DOI: 10.11648/j.nano.20160402.11      View  5950      Downloads  353
In recent years, there is a great interest in replacing a long time used materials in concrete structure by nanomaterials (NMs) to produce a concrete with novel functions. NMs are used either to replace a part of cement, producing ecological profile concrete or as admixtures in cement pastes. The great reactivity of NMs is attributed to their high purities and specific surface areas. A number of NMs been explored and among of them nanosilica (NS) has been used most extensively. This work aims to study, the hydration behavior of composite cements containing fly ash (FA) and nanosilica. Different cement blends were made from OPC, FA and NS. OPC was substituted with FA up to 30.0 mass, %, then the FA portion was replaced by equal amounts of NS (2.0, 4.0 and 6.0 mass, %). The hydration behavior was followed by determination of free lime (FL) and combined water (Wn) contents at different curing ages. The required water for standard consistency (W/C), setting times (IST & FST), bulk density (BD) and compressive strength were also estimated. Some selected hydration products were analyzed using XRD and DTA techniques. The results showed that, both of FA and NS improve the hydration behavior and mechanical properties of the investigated cements. But, NS possesses higher improvement level than FA, due to that, both of them behaves not only as filler, but also as activator to promote pozzolanic reaction, which enhances the formation of excessive dense products. The higher beneficial role of NS is mainly due to its higher surface area, seeding effect and pozzolanic activity in comparison with FA. The composite cement containing 70.0% OPC, 26.0% FA and 4.0% NS gave the desirable mechanical properties at all curing ages.
Hydration, Mechanical Properties, Composite Cement, Fly Ash, Nanosilica, Curing Time
To cite this article
H. El-Didamony, S. Abd El-Aleem, Abd El-Rahman Ragab, Hydration Behavior of Composite Cement Containing Fly Ash and Nanosized-SiO2, American Journal of Nano Research and Applications. Vol. 4, No. 2, 2016, pp. 6-16. doi: 10.11648/j.nano.20160402.11
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