کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
673015 1459477 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of frost damage and sample preconditioning on the porosity characterization of cement based materials using low temperature calorimetry
ترجمه فارسی عنوان
تأثیر آسیب یخبندان و تهیه نمونه اولیه بر خصوصیات تخلخل مواد با سیمان با استفاده از کالوریمتری درجه حرارت پایین
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی


• The impact of frost damage on the pore structure of cement pastes was studied.
• Frost damage can change the pore connectivity of cement based materials.
• Frost damage affects the (meso-)pore interior size distribution to a limited extent.
• Cement samples preconditioned in a big and a small amount of limewater were compared.
• Sample preconditioning has limited impact on the meso-porosity determination.

Low temperature calorimetry (LTC) can be used to study the meso-porosity of cement based materials. The influence of frost damage on the meso-porosity determination by LTC was explored on a model material MCM-41 and two cement pastes by conducting repeated cycles of freezing and melting measurements. The results indicate that the pressure generated during freezing and melting measurements has little impact on the pore structure of the powder MCM-41 samples. As for the studied cylinder samples of cement pastes, frost damage probably took place and it changed the pore connectivity while it had limited effect on changing the interior size distribution of the meso-pores. The analysis of the freezing and melting behavior of the pore liquid of cement based materials is complicated by the presence of ions. The freezing and melting behavior of the pore solution of cement paste samples preconditioned in either a small amount or a big amount of saturated limewater was compared. The results suggest that either the preconditioning in a big amount of limewater does not change the ionic concentration of the pore solution very much or the possible leaching of ions from cement hydrates during the preconditioning has limited influence on the freezing and melting behavior of the pore solution in the studied cement paste samples.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 607, 10 May 2015, Pages 30–38
نویسندگان
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