Sensitivity of Reactivity Test Methods to the Fineness of Supplementary Cementitious Materials

Author(s): Anuj Parashar, Vineet Shah and Shashank Bishnoi
Paper category: Proceedings
Book title: Proceedings of International Conferences (ICACMS) Advances in Construction Materials and systems Vol 2
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN: 978-2-35158-194-0
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 108-115
Total Pages: 8
Language : English

Abstract: Reactivity of pozzolanic materials highly depends upon their fineness. Generally quality of calcined clay pozzolana is very fine and reacts faster than other pozzolanic materials. Reactivity test methods, which do not consider the fineness as an important factor can create the hindrance for their actual strength potential when used in mortar or concrete. This study compares the pozzolanic reactivity of different supplementary cementitious materials (SCMs)
after changing fineness using different methods. For this purpose, one type of calcined clay, one fly ash and one slag was selected. The SCMs were ground to the higher fineness and their reactivity was compared with the original state. Different test methods such as lime reactivity, Chapelle’s test and isothermal calorimetry was tried for the reactivity study before and after changing the fineness. A clear difference in the compressive strength of cement mortar cubes and lime reactivity cubes were observed. Similar trend was observed with the help of calorimeter. In the case of Chapelle’s test, no variation on the calcium consumption was observed by altering the fineness of SCMs. This behaviour was also confirmed for fly ash sample with induction coupled plasma optical emission spectroscopy (ICP-OES). It was concluded that the methods which consider the factor of fineness while accounting the reactivity can be best suitable for the realistic reactivity potential of SCMs.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00

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