Yazar "Demir I." seçeneğine göre listele

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    Öğe
    Determination of type and ratio of superplasticizers in concrete production
    (2007) Şimşek O.; Aruntaş H.Y.; Demir I.
    Concrete is the most commonly used construction material. The most significant properties of the concrete are the workability and compressive strength. The use of silica fume (SF) and super plasticizers (SP) in concrete has considerably increased in recent years. In this research, three different SP in three different ratios were added to 10 % SF substitution of concrete. Slump, Ve-Be and air content properties were examined in the fresh sample concrete mixtures. In addition, the effects of 2, 7 and 28-day compressive strength and freezing-thawing resistance on hardened concrete were investigated. As a result, the highest compressive strength and freezing-thawing resistance were obtained with 1 % modification lignosulphanate SP additive concrete and 2 % modification lignosulphanate SP additive concrete, respectively.
  • [ X ]
    Öğe
    Effects of the fine recycled concrete aggregates on the concrete properties
    (2011) Yaprak H.; Aruntas H.Y.; Demir I.; Simsek O.; Durmus G.
    In this experimental study, the effects of the recycled fine recycled concrete aggregate (FRA) that was manufactured from concrete wastes on the concrete properties were investigated. In concrete mixtures, 0, 10, 20, 30, 40, 50 and 100% by weight FRA were used instead of river sand. Afterwards, unit weight and water absorption ratios and 28-day compressive strength were determined. According to the test results obtained, it was seen that FRA can be used up to 10% ratio for producing C30 concrete, between 20-50% ratios for producing C25 concrete. Thus, environmental impacts and consumption of the natural resources can be significantly reduced by using recycled fine concrete aggregates in concrete applications. © 2011 Academic Journals.