Thermal resistance, microstructure and mechanical properties of type I Portland cement pastes containing low-cost nanoparticles

This study aimed to utilize laboratory-prepared nano-silica (NS) and nano-alumina (NA) as low-cost nano-oxides additions for improving the mechanical properties and thermal resistance of hardened ordinary Portland cement (OPC) pastes. NS was synthesized from rice husk ash in the absence of any surfa...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2018-02, Vol.131 (2), p.949-968
Main Authors: El-Gamal, S. M. A., Abo-El-Enein, S. A., El-Hosiny, F. I., Amin, M. S., Ramadan, M.
Format: Article
Language:English
Subjects:
Aluminum chloride
Aluminum oxide
Analytical Chemistry
Cement
Cement paste
Cements (Building materials)
Chemistry
Chemistry and Materials Science
Compressive strength
Cooling
Cost control
Drinking water
Economic aspects
Heat transfer
Hydration
Inorganic Chemistry
Low cost
Measurement Science and Instrumentation
Mechanical properties
Physical Chemistry
Polymer Sciences
Portland cements
Silicon dioxide
Surfactants
Synthesis
Thermal resistance
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Summary:This study aimed to utilize laboratory-prepared nano-silica (NS) and nano-alumina (NA) as low-cost nano-oxides additions for improving the mechanical properties and thermal resistance of hardened ordinary Portland cement (OPC) pastes. NS was synthesized from rice husk ash in the absence of any surfactant, while NA was synthesized from AlCl 3 in the presence of CTAB as a surfactant. The average particle sizes of synthesized NS and NA were 30 and 40 nm, respectively. Nano-silica or nano-alumina was added to OPC as a single phase with different ratios of 0.5, 1, 2 and 3 by mass % of OPC. The physico-chemical characteristics of different OPC-NS and OPC-NA hardened pastes were studied after 1, 3, 7, 14, 28 and 90 days of hydration. The resistance of the hardened composites for firing was evaluated for specimens cured for 28 days under tap water and then fired at 300, 600 and 800 °C for 3 h. The fired specimens were cooled by two methods: gradual cooling and rapid cooling. The compressive strength test was performed for all mixes at each firing temperature. The compressive strength results revealed that the optimum addition of NS is 1, whereas the optimum addition of NA is 0.5 by mass % of OPC. XRD, TG/DTG and SEM results indicated that ill-crystalline and nearly amorphous C–S–H, C–A–S–H and C–A–H were the main hydration products.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-017-6629-1