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تحقیقات سیمان و بتن 2011
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • shear-thickening behavior of high-performance cement grouts — influencing mix-design parameters

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 863
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     rheology of concrete is of great importance to its flow performance, placement and consolidation. a full understanding of fresh concrete flow behavior can be achieved through a good understanding of paste rheology. cement pastes exhibit a complex rheological behavior affected by several physical and chemical factors, including water-to-cement ratio (w/c), high-range water-reducer (hrwr) type and dosage, and cement characteristics. an experimental investigation was carried out to evaluate the effect of w/c, hrwr–cement combinations, and supplementary cementitious materials (scm) on the pseudoplastic behavior of high-performance cement grouts. grout mixtures proportioned with w/c of 0.30, 0.33, 0.36, and 0.40, various cement–hrwr combinations, and cement substitutions by 8% silica fume were investigated. the incorporation of hrwr can lower the yield stress of mixtures, thus enhancing deformability, while silica fume improves mechanical and durability performances.

    high-performance structural grouts are shown to exhibit shear-thickening behavior at low w/c and shear-thinning behavior at relatively higher w/c. mixtures made with polycarboxylate hrwr acting by steric effect exhibited greater shear-thickening behavior compared to those made with polynaphthalene sulfonate-based hrwr acting by electrostatic effect. the paper discusses the effect of mixture parameters on non–linear rheological behavior of various grout mixtures prepared with different w/c, hrwr–cement combinations, and silica fume.

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