کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
261030 503678 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sorption scanning curves for hardened cementitious materials
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
Sorption scanning curves for hardened cementitious materials
چکیده انگلیسی
Drying of screeded floor slabs is an important issue for the building industry. However, virtually no attention is paid in prediction models to the hysteresis of sorption isotherms, mainly because of lack of data. Disregarding the hysteresis in prediction models will generate inaccurate predictions of future moisture distribution and remaining drying time. This paper presents a method for fast determination of scanning sorption isotherms and sorption isotherms by using a gravimetric vapour sorption balance. A sorption balance continuously determines the mass of a small sample subjected to a sequence of predefined vapour pressures and temperatures. Sorption isotherms and two examples of sorption scanning curves at 20 °C are presented. Results from three materials commonly used in screeded slabs are included, viz concrete W/C 0.65, concrete W/C 0.55, and a screed, Floor 4310 Fibre Flow. Absorption scanning curves obtained for concrete show a significant moisture history dependence as a consequence of the hysteresis of the desorption isotherm itself. Desorption scanning curves originating from the absorption isotherms indicate little influence of the moisture history.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 22, Issue 11, November 2008, Pages 2228-2234
نویسندگان
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