Alkali-Silica Reaction Potential of Arc-related Volcanic Rocks from the Göksun Ophiolite (Kahramanmaraş-Turkey)

Yıl 2017, Cilt: 17 Sayı: 1, 247 - 256, 24.04.2017

Tamer Rızaoğlu

Öz

The alkali-silica reactivity is one of the most important problems that can occur in concrete structures.

Because of their wide spectrum of mineralogical compositions and phases, volcanic rocks are more

likely to cause alkali-silica reactivity. In this study, alkali-silica reactivity potentials of the rocks

representing the upper levels of the crustal section of the Late Cretaceous suprasubduction-type

Göksun ophiolite in the Tauride ophiolitic belt have been investigated. The Göksun ophiolite displays

and intact ophiolite pseudostratigraphy with the thick layer of volcanic section characterized by a

different composition of rock units such as basalt, basaltic-andesite, andesite, dacite and rhyolite.

Firstly, the petrographic determinations of the samples derived from these volcanic units were made

and then geochemical analyzes carried o ut o n t he s ame s pecimens t o c ontrol t he a ccuracy o f t he

petrographic analyzes and the rocks were classified according to trace elements. Finally, the

accelerated mortar bar method was applied on the concrete bars produced from same rock samples to

compare the variation of Alkali-Silica Reactivity (ASR) with lithology. The test results yielded that the

intermediate volcanics have much Alkali Silica Reactivity (ASR) potential than basic and acidic volcanics

(basalts, rhyolites and dacites). It is estimated that the glassy matrix of the intermediate volcanics is

partly responsible for the alkali-silica reactivity. SiO2, TiO2, Al2O3, Na2O a nd K 2O values have show

positive correlation with the amounts of expansion in the andesite and basaltic andesites, whereas the

major oxide contents of acidic and basic volcanic rocks have no clear relation with the expansion ratios.

Anahtar Kelimeler

Ophiolite; volcanic, aggregate, Alkali-silica reactivity, Accelerated mortar bar method

Kaynakça

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