کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5437040 1509723 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
On the effect of calcium lignosulfonate on the rheology and setting time of cement paste
ترجمه فارسی عنوان
بر اثر لیگنوسولفونات کلسیم بر روی رئوولژی و زمان تنظیم رب سیمان
کلمات کلیدی
لیگنوسولفونات، مخلوط، رئوئولوژی، تنظیم عقب ماندگی جذب،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
چکیده انگلیسی
The effect of softwood calcium lignosulfonate, LSs, on the rheology and setting time of cement paste has been investigated. Two Portland cements with different surface area and C3A content were used. The lignosulfonate was added either immediately with the mixing water or delayed after 10 min of hydration. The cement pastes were characterized in terms of specific surface, rheology and heat of hydration. Extracted pore solutions were analysed for free lignosulfonate concentration and for changes in elemental composition. Immediate addition of LSs increased the specific surface, but not delayed addition. Correlations were found between rheology and surface coverage by LSs, as determined by adsorption isotherms, and between the setting time and the amount of free LSs in the pore solution. An increased setting retardation upon delayed addition related to an increased concentration of Al in the pore solution.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 100, October 2017, Pages 435-444
نویسندگان
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