کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1456336 1509766 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cellulose ethers and yield stress of cement pastes
ترجمه فارسی عنوان
استرهای سلولز و استرس عملکرد سیمان
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
چکیده انگلیسی


• We measure flow onset of cement pastes as a function of cellulose ether dosage.
• We measure cellulose ether adsorption on cement particles.
• We suggest that cellulose ethers are able to bridge cement particles.
• We analyze inter-particle forces due to polymer coils stretching and desorption.

We study in this paper the physical and chemical phenomena at the origin of the influence of cellulose ethers on flow onset of cement pastes. We first show that cellulose ether adsorption seems to slow down the nucleation of calcium silicates at the surface of the cement grains in the tens of minutes following mixing. We moreover suggest that the measured collapse of the van der Waals attractive interaction network upon the addition of cellulose ethers finds its origin in repulsive steric forces generated by adsorbed cellulose ether molecules. Finally, we measure the formation of a new interaction network in the system. From dimensional inter-particle force analysis, we suggest that this network finds its origin in the bridging of cement grains by adsorbed ether molecules. Flow onset occurs then through a desorption process, the energy of which can be assessed via adsorption isotherm measurements.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 55, January 2014, Pages 14–21
نویسندگان
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