Mechanical Properties of Different Volcanic Origin Rock Based Geopolymer Mortars Activated with Sodium Hydroxide
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https://doi.org/10.5281/zenodo.7771748Keywords:
Volcanic tuff, volcanic slag, geopolymer, alkali activation, sodium hydroxideAbstract
Different pozzolans are used in the cement industry to ensure sustainable cement production. Pyroclastic rocks, which are an important natural source of pozzolana, which can be in argillized or zeolized structure, are formed by the accumulation of all kinds of clastic materials from eruptive volcanoes in a storage area during volcanic events. The rocks formed by the consolidation of volcanic ash and volcanic dust are called "volcanic tuff". Rocks composed of volcanic glass in basic composition are called "volcanic slag". The most important feature of pyroclastic rocks is that they can easily decompose into zeolite minerals. Especially in Turkey, zeolite deposits containing clinoptilolite mineral were formed in this way. These pyroclastics with hydraulic properties rich in zeolite minerals are known as natural pozzolans. In this study, the usability of volcanic origin rocks named "VC" and "VT", respectively, obtained from Antakya with "volcanic slag" feature and Manisa Gördes region with "volcanic tuff" feature, in geopolymer mortar production was investigated. 40x40x160mm geopolymer mortar samples were produced by using sodium hydroxide at 8% sodium concentration for alkali activation of rocks of volcanic origin. The rocks of volcanic origin were ground according to ASTM-C618 pozzolanic fineness limit.The produced geopolymer mortar samples were subjected to heat curing at 80°C for 36, 72 and 96 hours. It was observed that the highest flexural strength value was found in VT12.5 sample (7.8 MPa) and the highest compressive strength value was found in VT12.5 sample (44.3 MPa) in geopolymer mortars that were thermally cured in an oven at 80°C curing temperature for 96 hours.
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