کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7884542 | 1509714 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Autogenous shrinkage of alkali activated slag mortars: Basic mechanisms and mitigation methods
ترجمه فارسی عنوان
انقباض اتوژن از ملات های قلیایی فعال سرباره: مکانیزم های اصلی و روش های کاهش آن است
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کلمات کلیدی
انقباض اتوژن سرباره فعال سرباره، کشش سطحی، استرس مویرگی، روش کاهش ریزش،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی صنعتی و تولید
چکیده انگلیسی
This paper presents various mechanisms that can explain the cause of excessive autogenous shrinkage exhibited by alkali activated slag mortars (AASM) compared to Portland cement mortars (OPC). The influence of activator concentration parameters such as Na2O content and of the silica modulus (Ms) on the magnitude of autogenous shrinkage are evaluated, as are the proposed mechanisms. The results show that the shrinkage kinetics of AASM is strongly dependent upon the rate of reaction, internal relative humidity (RH) and surface tension of the pore solution. Pore size variation between AASM and OPC mortars and the corresponding tensile stresses based on the capillary tension approach were also calculated using experimentally measured internal RH and surface tension values. A higher amount of both Na2O and Ms. resulted in larger capillary stress resulting in greater autogenous shrinkage. Use of internal curing and of shrinkage reducing admixture were very effective in reducing the autogenous shrinkage of AASMs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 109, July 2018, Pages 1-9
Journal: Cement and Concrete Research - Volume 109, July 2018, Pages 1-9
نویسندگان
Darshan Ballekere Kumarappa, Sulapha Peethamparan, Margueritte Ngami,