A Study on Properties of Limestone-blast Furnace Slag Blended Cement and the Influencing Factors

DOI
  • GOTO So
    International Technology Team, Cement & Concrete Research Department，Central Research Laboratory
  • KIRINO Yusuke
    Cement Chemistry Team, Cement & Concrete Research Department，Central Research Laboratory
  • HYODO Hikotsugu
    Manager，International Technology Team, Cement & Concrete Research Department，Central Research Laboratory

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Other Title
  • 石灰石―高炉スラグ混合セメントのモルタル物性に 与える影響要因に関する研究

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 Use of mineral admixtures in cement has been promoted in the cement industry in the efforts towards a carbon-neutral society. On the other hand, the production of blast furnace slag, a typical mineral admixture, is forecasted to decrease in the future. This study experimentally investigated the properties of the mortar of blended blast furnace slag cement which was partially replaced with limestone powder, and also evaluated the influencing factors of the properties for the mortar. It was found that the partial replacement with limestone powder increased flowability of the mortar, shortened setting time and improved early strength development. When the replacement ratio of limestone powder was up to 10%, both 28-day compressive strength and water penetration rate coefficient of the mortar remained almost the same as those without replacement. Moreover, the results suggested that while porosity was the dominant influencing factor of the compressive strength, the complexity of the pore structure in the mortar had to be also taken into account for the water penetration rate coefficient.

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