Mortar Properties Improvement by Using Fine Portland Cement Clinker as Reactive Aggregate
Publish Year: 1399
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IJMSEI-18-1_005
تاریخ نمایه سازی: 24 بهمن 1401
Abstract:
Microscopic studies has shown that adjacent to the interface between cement paste and aggregate, there exists an area with high porosity and low binding compounds that is referred to as interfacial transition zone (ITZ). ITZ in concrete and mortar imposes a number of negative effects, including flexural and compressive strengths reduction and permeability enhancement. That’s why many research attempts have been devoted to limit ITZ and its negative effects. The present study investigates the possibility of utilizing fine Portland cement (PC) clinker as a reactive aggregate in mortar for the same purpose. For this, natural quartz sand in normal mortar (NM) was totally replaced with PC clinker of the same particle size distribution and the most important engineering properties of the new mortar referred to as Reactive Aggregate Mortar (RAM) were measured and compared with NM as control. The results of compressive strengths measurements represented ۶۵% and ۲۱% increases at curing ages of ۷ and ۹۰ days, respectively, for RAM compared to NM. Chloride penetration depth in RAM displayed reductions by about ۳۳% and ۲۶% after ۱۴ and ۲۸ days of exposure, respectively. The effect of PC clinker reactivity on the microstructure and size of ITZ was studied by using scanning electron microscopy.
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Authors
Jafar Shafaghat
Research Laboratory of Inorganic Chemical Process Technologies,School of Chemical Engineering, Iran University of Science and Technology, Narmak
Ali Allahverdi
Iran university of Science and Technology
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