Strength and Durability Performance of Mortars Incorporating Calcined Clay as Pozzolan in Comparison with silica fume

سال انتشار: 1401
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 309

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شناسه ملی سند علمی:

JR_JCEMA-6-3_004

تاریخ نمایه سازی: 28 فروردین 1402

چکیده مقاله:

The use of low-grade calcined clays is the only potential material available in large quantities to meet the requirements of eco-efficient supplementary cementitious materials by decreasing the clinker content in blended types of cement or cement content in concrete. In the present paper, six mortar mixtures with a constant w/b ratio were used to investigate the mechanical and durability properties of mixtures substituted with low-grade calcined clays with/without limestone compared to PC and silica fume mixtures. The results obtained show that using calcined clays with low or intermediate purity (i.e., kaolinite content) leads to enhanced durability properties besides the comparable strength development characteristics compared to PC mortar. In this regard, the addition of ۳۰% calcined clay with/without limestone led to a marked decrease (about ۸۰ and ۴۰%) in chloride ion diffusion coefficient (Da) and an increase in surface chloride content (Cs) compared to the reference mixture. In addition, the utilization of calcined clay with a kaolinite content of ۵۶.۷% led to a reduction of ۵۲% in Da and an increase of ۱۴۰% in electrical resistivity compared to silica fume binder. The primary reason for the better performance is attributed to the refined pore structure and dense microstructure of the cement paste with the calcined clay pozzolan compared to PC and silica fume.

نویسندگان

Ali Dousti

Assistant Professor of Road, Housing & Urban Development Research Center, Tehran, Iran.

Hadi Beyki

School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran.

Mohammad Shekarchi

School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran.

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