بررسی آزمایشگاهی عملکرد پلی اتیلن گلیکول به عنوان ماده کاهنده جمع‌شدگی بتن (SRA)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیأت علمی دانشگاه خواجه نصیرالدین طوسی

2 کارشناسی ارشد مهندسی و مدیریت ساخت. دانشگاه خواجه نصیر

3 کارشناسی ارشد مهندسی و مدیریت ساخت دانشگاه خواجه نصیر

4 کارشناسی ارشد مهندسی سازه دانشگاه خواجه نصیر

چکیده

< p>< p>یکی از روش‌های کاهش جمع‌شدگی ناشی از خشک‌شدن، استفاده از مواد افزودنی کاهنده جمع‌شدگی می‌باشد. هر چند این مواد با نام های تجاری مختلف عرضه می گردند، در بسیاری موارد ماده پایه آنها گلیکولی می باشد. در این تحقیق به بررسی عملکرد پلی اتیلن گلیکول به عنوان ماده کاهنده جمع شدگی پرداخته شده است. بررسی آزمایشگاهی شامل دو فاز بوده است. در فاز اول آزمایش‌ها خصوصیات این ماده تعیین و همچنین تاثیر آن بر روی کارایی، مقاومت فشاری و جمع شدگی آزاد مخلوط های ملات کنترل و مخلوط های ملات حاوی درصدهای مختلف پلی اتیلن گلیکول شامل 5/1، 2، 5/2و 3 درصد وزنی سیمان بررسی شده است. در فاز دوم این پژوهش تأثیر ماده پلی اتیلن گلیکول روی خواص مختلف بتن شامل کارایی، مقاومت فشاری و کششی، جمع شدگی آزاد و پتانسیل ترک‌خوردگی در آزمایش حلقه جمع‌شدگی مقید مورد بررسی قرار گرفت. نتایج نشانگر این است که با استفاده از پلی‌اتیلن گلیکول به میزان 2 الی 3 درصد وزنی سیمان، امکان کاهش قابل توجه در جمع‌شدگی آزاد و همچنین کاهش پتانسیل ترک‌خوردگی بتن وجود دارد. در عین حال میزان تاثیر این ماده در مقایسه با موارد گزارش شده برای مواد تجاری کمتر بوده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Laboratory Investigation of Polyethylene Glycol as a Concrete Shrinkage Reducing Admixture (SRA)

نویسندگان [English]

  • Alireza Bagheri 1
  • M.H. Noormohammadbeyk 2
  • S.H. Kashian 3
  • H Zanganeh 4
1 Associate Professor, Faculty of Civil Eng., K. N. Toosi University of Technology
2 M.Sc . Construction eng and management. K. N. Toosi university of echnology
3 M.Sc. in construction engineering and management. K. N. Toosi university of technology
4 M.Sc. in structural engineering. K. N. Toosi university of technology
چکیده [English]

< p >< p >The use of shrinkage reducing admixtures, is one of the methods for reducing concrete drying shrinkage. As many of commercial shrinkage reducing admixtures are glycol-based, in this study the performance of polyethylene glycol as a shrinkage reducing admixture was studied. In the first phase the basic properties of the material were determined and its effect on workability, compressive strength development and free shrinkage of cement mortars containing various dosages of this material, from 1.5 to 3 % by cement weight, was investigated. In the second phase of this research, the effect of polyethylene glycol on various properties of concrete including; workability, compressive and tensile strength development, free shrinkage and cracking potential in restrained ring test was studied. The results showed that using polyethylene glycol at a dosage of 2, 3% by cement weight results in considerable reduction in free shrinkage and also the cracking potential under restrained conditions. However the effect is lower than that reported for the commercial materials.

کلیدواژه‌ها [English]

  • drying shrinkage
  • Shrinkage Reducing Admixture
  • polyethylene glycol
  • Restrained ring test
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دوره 5، شماره 2 - شماره پیاپی 10
پاییز و زمستان 1399
صفحه 189-208
  • تاریخ دریافت: 21 بهمن 1399
  • تاریخ بازنگری: 23 فروردین 1400
  • تاریخ پذیرش: 27 اردیبهشت 1400