بررسی جمع‌شدگی طولانی مدت بتن سبک خودتراکم حاوی اسکوریا و لیکا

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشکده مهندسی، دانشگاه بوعلی سینا، همدان

2 دانشیار دانشکده مهندسی، دانشگاه بوعلی سینا

10.22124/jcr.2025.28899.1679

چکیده

یکی از ویژگی‌های مهم بتن سبک خودتراکم که بر دوام آن موثر است، جمع‌شدگی است. در تحقیق حاضر، بتن‌های سبک خودتراکم با سبکدانه‌های لیکا و اسکوریا در دو نسبت آب به سیمان 35/0 و 4/0 و دو درصد درشت‌دانه به کل سنگدانه 35% و 40% ساخته شده‌اند. کارایی، مقاومت فشاری و مدول الاستیسیته طرح‌ها ارزیابی شده‌اند. همچنین، جمع‌شدگی یک ساله طرح‌ها نیز مورد بررسی قرار گرفته است. نتایج حاکی از آن است که ساخت بتن‌های سبک خودتراکم با سبکدانه‌های لیکا و اسکوریا با کارایی مناسب، مقاومت فشاری و مدول الاستیسیته بیشتر از 30 مگاپاسکال و 17 گیگاپاسکال امکان‌پذیر است. جمع‌شدگی 365 روزه بتن‌های سبک خودتراکم از بتن‌های خودتراکم حدودا 38 درصدکمتر بوده است. کاهش نسبت آب به سیمان و افزایش درصد درشت‌دانه به ترتیب باعث کاهش 50 و 36 درصدی جمع‌شدگی شده است. نتایج نشان داده است که بیش از 80 درصد میزان جمع شدگی تا سن 250 روز رخ داده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

An investigation of the long-term shrinkage of self-compacted lightweight concretes with Scoria and Leca

نویسندگان [English]

  • nikta loghmani 1
  • M. Nili 2
1 Civil engineering faculty, Bu-Ali Sina university, Hamedan
2 Associate professor, Civil Eng., Dept., Bu-Ali Sina University, Hamedan, I.R.Iran
چکیده [English]

One of the important features of self-compacted lightweight concrete is shrinkage, which affects durability and service life of the structures. In the present study, self-compacted lightweight concretes containing Scoria and Leca were produced with two water-cement ratios (0.35, 0.4) and two coarse percentages (35%, 40%). Workability, compressive strength and modulus of elasticity of the specimens were evaluated. Moreover, the long term shrinkage strain was monitored during one year. The results indicated that it is possible to produce self-compacted lightweight containing Scoria and Leca with proper workability, compressive strength and modulus of elasticity of more than 30 MPa and 17 GPa, respectively. Also, the shrinkage value of self-compacted lightweight concretes was 38% lower than those for self-compacted ones. Reducing the water to cement ratio and increasing coarse percentage resulted into 50% and 36% decreases in the shrinkage, in turn. Monitoring of the results revealed that 80% of the total shrinkage strain occurred until 250 days.

کلیدواژه‌ها [English]

  • self-compacted lightweight concrete
  • long-term shrinkage
  • Leca
  • Scoria

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