Geomechanics and Engineering

  • 제20권3호
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  • Pages.233-241
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  • 2020
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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Effect of rock mineralogy on mortar expansion

  • Karaman, Kadir (Department of Mining Engineering, Karadeniz Technical University) ;
  • Bakhytzhan, Aknur (Department of Mining Engineering, Karadeniz Technical University)
  • 투고 : 2019.11.08
  • 심사 : 2020.01.23
  • 발행 : 2020.02.10
⟨ 이전 논문 다음 논문 ⟩

초록

Alkali-silica reaction (ASR) is among one of the most important damaging mechanisms in concrete, depending primarily on aggregates which contain reactive minerals. However, expansion in concrete may not directly relate to the reactive minerals. This study aims to investigate the influence of ASR and the expansion of mortar bars depending on aggregate type containing various components such as quartz, clay minerals (montmorillonite and kaolinite) and micas (muscovite and biotite). In this study, the accelerated mortar bar tests (AMBT) were performed in two conditions (mortar bars in the same and sole NaOH solutions). Petrographic thin section studies, X-ray diffraction (XRD) analysis (Rietveld method), scanning electron microscopy (SEM) and chemical analyses were carried out. This study showed that quartzite bars led to increase in expansion values of mortar bars in diabase-1 and andesite when these were in the same NaOH solution. However, three samples (basalt, quartzite and claystone) were found having ASR expansion based on the AMBT when the special molds were used for each sample. SEM study revealed that samples which exhibit highest expansions according to AMBT had a generally rough surface and acicular microstructures in or around the micro-cracks. Basalt and quartzite showed more variable in major oxides than those of other samples based on the chemical analyses, SEM studies and AMBT. This study revealed that the highest expansions were observed to source not only from reactive aggregates but also from alteration products (silicification, chloritization, sericitization and argillisation), phyllosilicates (muscovite, biotite and vermiculite) and clays (montmorillonite and kaolinite).

키워드

과제정보

연구 과제 주관 기관 : Karadeniz Technical University

The study was financially supported by Karadeniz Technical University through project (No: 7828). The authors would like to express their sincere thanks and appreciation to Assoc. Prof. Dr. Ferdi Cihangir and Assoc. Prof. Dr. Ayberk Kaya for improving the quality of the manuscript.

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