Computers and Concrete

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Effectiveness of mineral additives in mitigating alkali-silica reaction in mortar

  • Nayir, Safa (Department of Civil Engineering, Karadeniz Technical University) ;
  • Erdogdu, Sakir (Department of Civil Engineering, Karadeniz Technical University) ;
  • Kurbetci, Sirin (Department of Civil Engineering, Karadeniz Technical University)
  • Received : 2017.03.24
  • Accepted : 2017.09.02
  • Published : 2017.12.25
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Abstract

The effectiveness of mineral additives in suppressing alkali-silica reactivity has been studied in this work. Experimentation has been performed in accordance with the procedures prescribed in ASTM C 1567. In the scope of the investigation, a quarry aggregate which was reactive according to ASTM C 1260 was tested. In the experimental program, prismatic mortar specimens measuring $25{\times}25{\times}285mm$ were produced. Ten sets of production, three specimens for each set, were made. Length changes were measured at the end of 3, 7, 14 and 28 days and then expansions in percentage have been calculated. Fly ash, silica fume, and metakaolin have been used as cement replacement in different ratios for the testing of the alkali-silicate reactivity of the aggregate. In the mixes performed, the replacement ratios were 20%, 40%, and 60% for the fly ash, and 5%, 10%, and 15% for the silica fume, and 5%, 10%, and 15% for the metakaolin. Mixes without mineral additives were also produced for comparison. The beneficial effect in suppressing alkali-silica reactivity is highly noticeable as the replacement ratios of the mineral additives increase regardless of the type of the mineral additive used. Being more concise, the optimum concentrations of using silica fume and metakaolin in mortar in suppressing ASR is 10%, respectively, while it is 20% for fly ash.

Keywords

References

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