Physical and Chemo/Mechanical behaviors of fly ash and silica fume belite cement pastes- Part I

Darweesh H.H.M
Refractories, Ceramics and Building Materials Department, National Research Centre, Cairo, Egypt.
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Abstract

Physical, chemical and mechanical properties of high belite cement (HBC) blended with high pulverized fly ash (HPFA) with stable ratio of silica fume (SF) in comparison with Portland cement (OPC) were investigated. Results showed that the water of consistency and setting times (Initial and final) tended to increase with the increase of HPFA content. The bulk density and compressive strength were also improved and enhanced with the increase of HPFS content at all hydration times, but only up to 15 % HPFA, and then decreased with further increase.  However, the total porosity slightly decreased, but started to increase with further increase of >15 % HPFA. The free lime content of the pure OPC and HBC gradually were increased as the hydration times progressed up to 90 days, while those of blended cements increased only up to 7 days and then decreased onward. The results were confirmed by measuring the heat of hydration and ultrasonic pulse velocity for the optimum cement pastes comparing with those of both OPC and HBC. The heat of hydration of the optimum cement pastes was decreased at all hydration times and become lower than those of OPC and HBC. The ultrasonic pulse velocity test (USPV) proved that the uniformity and quality of the matrix of the hardened cement pastes are good with no cracks.

Keywords

  • OPC,
  • HBC,
  • HPFA,
  • SF,
  • Setting,
  • Density,
  • Porosity,
  • Strength,
  • Free lime,
  • Heat of hydration
  • ...More
    Less

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