Abstract
Pozzolanes are mineral additives that have been widely used in concrete production recently. The main purposes of pozzolana additives used in concrete are to provide economy and improve various properties of concrete. In this study, obsidian mineral which located in Pasinler District of Erzurum Province and has high amount of reserves in the world with high silica content, and zinc slag which occurring during the production of zinc metal, in the metal industry mainly in Turkey and high production capacity in the world, pozzolanic properties has been investigated. For the pozzolanic activity test, mortar samples were produced by using 5, 10, 15, 20 and 25% obsidian; 2.5, 5, 7.5 and 10% zinc slag instead of cement. Samples produced for the determination of pozzolanic activity index were kept at 7 and 28-days standard cure. At the end of the curing period, pozzolanic activity indexes were determined on the basis of compressive strength. As a result of the pozzolanic activity test, the highest pozzolanic activity value was obtained at the rate of 15% for obsidian and 5% for zinc slag. When the results are examined, it is determined that both materials can be used as pozzolan instead of cement.
Highlights
Pozzolanes are divided into 2 main parts; natural pozzolans; volcanic ash, tuff, diatomaceous earth and similar materials containing the residues of siliceous algae called diatoms, and some clays that have been fired up to a certain temperature are included in this class
SiO2, which is found in pozzolanic materials used in pozzolanic reactions in cement or concrete, reacts with Ca(OH)2 formed as a result of hydration of the cement with water and creates C-S-H gels, resulting in an increase in strength in the short or long term (Erdoğan and Erdoğan, 2007).When Table 1 is evaluated, it is seen that the silica amount of Pasinler obsidian is much higher than the amount of silica and the silica amount of zinc slag
While silica ratio of the Pasinler obsidian is high enough compared to the ratio of these two artificial pozzolan, the silica ratio of the zinc slag is partially low
Summary
Pozzolanes are divided into 2 main parts; natural pozzolans; volcanic ash, tuff, diatomaceous earth and similar materials containing the residues of siliceous algae called diatoms, and some clays that have been fired up to a certain temperature are included in this class. Artificial pozzolanes that emerge as a by-product during industrial production such as fly ash, granulated blast furnace slag and silica fume, rice husk ash (Erdoğan and Erdoğan, 2007). Artificial pozzolans such as fly ash, silica fume and blast furnace slag, which take up space in nature as waste products, are widely used in concrete production (Ardahanlı et al, 2021; Bascetin et al, 2021; Alameri et al, 2020; Bascetin et al, 2020; Ardahanlı et al, 2019; Alameri et al, 2019; Şahin et al, 2019; Wang et al, 2017; Nowak, 2014; Wong and Razak, 2005; Siddique, 2004). The materials that are classified as natural and artificial pozzolan and the materials that are specified in their definition (SiO2, Al2O3) are carried out in studies to determine whether they show pozzolanic properties
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