کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
862147 1470799 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Exploitation and investigation of new grafted copolymer shrinkage-reducing admixture
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Exploitation and investigation of new grafted copolymer shrinkage-reducing admixture
چکیده انگلیسی

Four grafted copolymer shrinkage-reducing admixtures(SRA)were synthesized by the radical copolymerization reacted between unsaturated polyether macro-monomer (RPM(V24) RPM(A24) RPM(MA24) RPM(B24)) which contain the same branch chain length of 2400 and acrylic acid(AA). The experimental results showed that the RPM(B24)-AA had the most optimal shrinkage-reducing effect when the number average molecular weight was between 15000∼20000. Compared with conventional polyether shrinkage-reducing admixture (PSRA), the RPM(B24)-AA demonstrated the superior shrinkage reduction performance without the reduction of the surface tension of capillary water significantly. It has been found that the dry shrinkage of hardened cement paste at 90 days was reduced by about 33.1% and the autogenous shrinkage at 90 days by about 58.1% with 2.0% dosage. The results also indicated that, the shrinkage performance of the grafted copolymer shrinkage-reducing admixture was closely related with the hydrophobic of main chain structure and the molecular weight of grafted copolymer.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Procedia Engineering - Volume 27, 2012, Pages 365-373