کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1456734 989221 2011 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The origin of early age expansions induced in cementitious materials containing shrinkage reducing admixtures
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
پیش نمایش صفحه اول مقاله
The origin of early age expansions induced in cementitious materials containing shrinkage reducing admixtures
چکیده انگلیسی

Studies on the early-age shrinkage behavior of cement pastes, mortars, and concretes containing shrinkage reducing admixtures (SRAs) have indicated these mixtures frequently exhibit an expansion shortly after setting. While the magnitude of the expansion has been noted to be a function of the chemistry of the cement and the admixture dosage; the cause of the expansion is not clearly understood. This investigation uses measurements of autogenous deformation, X-ray diffraction, pore solution analysis, thermogravimetry, and scanning electron microscopy to study the early-age properties and describe the mechanism of the expansion in OPC pastes made with and without SRA. The composition of the pore solution indicates that the presence of the SRA increases the portlandite oversaturation level in solution which can result in higher crystallization stresses which could lead to an expansion. This observation is supported by deformation calculations for the systems examined.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 41, Issue 3, March 2011, Pages 218–229
نویسندگان
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