Maturity and equivalent age functions of mineral admixtures incorporated mortars

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2017
Atasever, Muhammet
There are many studies on the maturity method, which is a non-destructive testing methods. However, most of these studies are associated with portland cement and its types. In this study, 4 different mineral admixtures (limestone powder, trass, fly ash and ground granulated blast furnace slag) were used at 6%, 20% and 35% (by mass) replacement levels. Besides the control portland cement mortars, mortars having 110 ± 5% flow according to ASTM C109 were also prepared using the blended cements. Then, 2, 7, 14, 28 and 90-day compressive strengths of 13 different mortars were determined. The aim of this thesis is to investigate the effects of mineral admixture type and amount on the maturity and equivalent age functions using methods described in the relevant standard (ASTM C1074). For this purpose, apparent activation energy and datum temperature of these 13 mixtures were determined according to 3 different options in ASTM C1074 and these options were examined. In addition, a new approach was proposed especially for blended cements by using Option A1.1.8.1. and the results obtained from this approach were discussed in detail. In addition, a method was proposed for the determination of apparent activation energy and datum temperature by considering the compressive strength-age relationship of these mixtures. Besides, the relationship between the Nurse-Saul equivalent age function and ratio of compressive strength at 3 different curing temperature by taking the reference temperature as 20°C was examined.  
Citation Formats
M. Atasever, “Maturity and equivalent age functions of mineral admixtures incorporated mortars,” M.S. - Master of Science, Middle East Technical University, 2017.