تاثیر تعداد سیکل های یخبندان-ذوب روی خواص فیزیکی و مکانیکی ماسه سنگ لوشان و ملات سیمان

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه بین المللی امام خمینی (ره)

2 دانشگاه بین المللی امام خمین (ره)

چکیده

فرایند یخبندان-ذوب از جمله این عوامل است که به صورت گسترده خواص سنگ‌ها و بتن را تحت تاثیر قرار می‌دهد. بنابراین در مناطقی که احتمال رخ دادن این فرایند است ضروری می‌باشد تاثیر این فرایند بر روی ویژگی‌های فیزیکی و مکانیکی مصالح در نظر گرفته شود. در بیشتر پژوهش های انجام شده دمای دوره ی یخبندان و دوره ی ذوب و مدت زمان آن بدون توجه به وضعیت آب و هوایی مناطقی که احتمال رخ دادن فرایند یخبندان-ذوب است انتخاب شده است و همچنین در مورد مصالح بر پایه سیمان تمرکز پژوهش ها بر روی بتن بوده و پژوهش های اندکی در رابطه با تاثیر یخبندان-ذوب روی ملات سیمان انجام شده است. در این پژوهش تاثیر تعداد سیکل های یخبندان-ذوب روی تخلخل، مقاومت تراکمی تک محوره و مقاومت کششی برزیلی نمونه ماسه سنگ و ملات سیمان با توجه به داده های هواشناسی مناطق غرب و شمالغرب ایران که احتمال رخ دادن فرایند یخبندان- ذوب در این مناطق می باشد بررسی شده است.همچنین برای بررسی تخریب در اثر یخبندان-ذوب عکس برداری سی تی اسکن از نمونه ماسه سنگ به عمل آمده است نتایج نشان داده است با افزایش تعداد سیکل های یخبندا-ذوب مقدار درصد تخلخل نمونه ها به صورت خطی افزایش در حالی که مقاومت تک محوره و مقاومت کششی آن ها کاهش پیدا کرده است همچنین بررسی عکس های سی تی اسکن نشان می دهد فاکتور آسیب در نمونه ماسه سنگ با افزایش سیکل افزایش پیدا کرده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of number of freeze-thaw cycles on physical and mechanical properties of Lushan sandstone and cement mortar

نویسندگان [English]

  • Koorosh Abdolghanizadeh 1
  • Mehdi Hosseini 2
  • Morteza saghafiyazdi 1
1 Imam Khomeini international university
2 Imam Khomeini International University
چکیده [English]

Freeze-thaw process is one of these factors which extensively affects rocks and concrete properties. Thus, taking its impact on physical and mechanical properties of materials into account is required in the regions susceptible to the process. In most of the previous studies, the freezing and thawing periods' temperatures and their duration were chosen regardless of the weather conditions of the regions susceptible to the freeze-thaw process and regarding cement-based materials, the investigations were focused on concrete and there are a few studies on freeze-thaw effect on cement mortar. This study addressed the effect of number of freeze-thaw cycles on porosity, uniaxial compressive strength and Brazilian tensile strength of sandstone and cement mortar specimens considering the climatic data of western and northwestern regions of Iran in which the occurrence of freeze-thaw process is possible. Furthermore, the computerized scan (CT) was carried out on the sandstone specimen to examine the damage resulting from freeze-thaw. The results indicated that the increase in the number of freeze-thaw cycles caused in linear increase in the porosity of the specimens, while reducing their uniaxial and tensile strength. The study of the CT images also showed that the damage factor was increased by increasing the number of cycles.

کلیدواژه‌ها [English]

  • physical and mechanical properties
  • Freeze-thaw cycle
  • Sandstone
  • cement mortar

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