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گواهی نمایه سازی مقاله EFFECT OF SILICA FUME ON HYDRATION HEAT AND STRENGTH DEVELOPMENT OF HIGH STRENGTH CONCRETE

عنوان مقاله: EFFECT OF SILICA FUME ON HYDRATION HEAT AND STRENGTH DEVELOPMENT OF HIGH STRENGTH CONCRETE
شناسه (COI) مقاله: ICCD03_004
منتشر شده در سومین کنفرانس بین المللی بتن و توسعه در سال ۱۳۸۸
مشخصات نویسندگان مقاله:

M Nili - Ass. Professor, Civil Eng. Dept. Faculty of Eng. Bu Ali Sina University, Hamedan
A Ehsani - Msc Student, Civil Eng. Dept. Bu Ali Sina University, Hamadan

خلاصه مقاله:
Recently, silica fume became a vital ingredient for producing concrete in aggressive hot climate of Iran. In mass structures heat generation due to hydration of cement and strength properties are two important parameters which affect service life of structures. In the early age the temperature in the body of mass concrete is high and tensile strength is low. This special condition may lead to occurrence of thermal cracks. In the present study, concrete specimens with water cement ratio 0.3, were made and 0, 10 and 15 percent Portland cement replaced with silica fume. Temperature rise of the specimens was monitored just after casting in a semi adiabatic box. Temperature rise was recorded for 7 days. Furthermore, compressive strength of the cubic specimens from 1 day after casting to 91 days was measured. The results declared that hydration heat regime is affected by silica fume percent. The mixes with both 10 and 15% silica fume, had peak temperature about 6ºC lower than the specimens without silica fume. Furthermore, peak temperature of the specimens without silica fume occurred 23 hours after casting, while it became about 31 hours for silica fume specimens. The slope of cooling zone of hydration regime in the specimens with 10% silica fume is very mild compare with the others. On the other hand, 10% silica fume enhanced compressive strength more effectively. These results demonstrated that hydration heat and strength development of mass concrete are affected by silica fume content and higher replacement of this pozzolan material may adversely affect service life of structures. s

کلمات کلیدی:
silica fume, hydration heat, high strength concrete, strength development

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