کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1457525 989266 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The microstructure of dispersed and non-dispersed fresh cement pastes — New insight by cryo-microscopy
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
پیش نمایش صفحه اول مقاله
The microstructure of dispersed and non-dispersed fresh cement pastes — New insight by cryo-microscopy
چکیده انگلیسی

This study aims to give new insights to the microstructural development of fresh cement pastes without and with polycarboxylate-type (PCE) of superplasticizers. Qualitative comparisons of the particulate structure of such cementitious systems were carried out by using cryo-FIB and cryo-SEM techniques. The natural structure of fresh cement pastes was preserved by high pressure freezing.It is illustrated that non-dispersed cement systems tend to form hydration rims on the surface of the clinker grains immediately after mixing. This leads to an interlocking of the particles. In contrast, in the dispersed systems the early hydrates precipitate in the pore solution and thus, agglomeration is prevented. These microstructural observations are important aspects of the fluidization effect of superplasticizers.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 38, Issue 4, April 2008, Pages 522–529
نویسندگان
, , , , , , ,