Effect of Pozzolanic Materials on Setting Time and Properties of Fresh Concrete

  • سال انتشار: 1390
  • محل انتشار: اولین کنفرانس بین المللی و سومین کنفرانس ملی سد و نیروگاههای برق آبی
  • کد COI اختصاصی: NCHP03_262
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 2335
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نویسندگان

Farzaneh Sami

MSc student of Hydraulic Structural Engineering

Seyed Shahab Esmaeil Nejad

B.ScStudent of Civil Engineering Sharif University of Technology

Mohammad Shekarchizadeh

Assistant Professor of Civil Engineering and Director of Construction Material Institute University of Tehran

چکیده

The paper presents the result of an experimental investigation carried out on the effect of pozzolanic materials on six properties of fresh concrete including initial setting, final setting, bleeding, density, slump, and slump loss. Four pozzolanic concrete containing Silica Fume, Zeolite, Metakaolin (high reactive), and Fly Ash were compared in rheological properties with each other and with a control concrete containing no pozzolanic materials. In this study, the water to binder ratio is fixed to 0.47 for all mixtures, but owing to different pozzolanic materials, initial slumps were different in all mixtures. The addition of pozzolanic materials is based on the normal amount of usage of these materials in industrial concreting. The replacement of cement in each mix design is 7.5%, 10%, 15% and 10% by weight for Silica Fume, Zeolite, Fly Ash and Metakaolin, respectively. Results show that utilizing Fly Ash increases the workability and delays the hardening of concrete, which will result in less early age’s shrinkage. Beyond this, use of pozzolans like Silica Fume, Zeolite, and Metakaolin could be assumed as a catalyst which accelerates hardening of concrete and eventuates in more early age’s shrinkage

کلیدواژه ها

Fresh concrete, Slump, Setting, Bleeding, Pozzolan

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