کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1454624 1509676 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructural investigations on the skinning of ultra-high performance concrete
ترجمه فارسی عنوان
تحقیقات میکرو سازه در پوست سازی بتن فوق العاده با کارایی بالا
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
چکیده انگلیسی

A skinning phenomenon occurring in the first seconds to minutes on ultra-high performance concrete (UHPC) was analysed by microstructural investigations. The low water content and the resulting high content of superplasticizers, i.e. polycarboxylate ethers, lead to differences in rheological behaviour of fine grained UHPC containing silica fume. A visco-elastic surface layer impedes the deaeration and constrains smoothing of the concrete surface. A detailed multi-method characterization of the microstructure of the layered cross-section revealed enrichments of polycarboxylate ether superplasticizers (PCE) on the surface of the UHPC. FITC-staining of the PCE made a localisation and relative quantification possible. A hypothesis for the formation of the skin comprising PCE enrichment driven by evaporation is derived from this microstructural study.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Composites - Volume 57, March 2015, Pages 27–33
نویسندگان
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