کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1454561 1509680 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Shrinkage characteristics of alkali-activated fly ash/slag paste and mortar at early ages
ترجمه فارسی عنوان
ویژگی های انقباض خمیر خاکستر / خاکستر قلع فعال قلیایی و ملات در اوایل سنین
کلمات کلیدی
انقباض، ریز ساختار، محصولات واکنش خاکستر و خاکستر فعال خاک آلوده، استحکام فشاری، قطر بینی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
چکیده انگلیسی

The purpose of this study is to investigate the shrinkage characteristics of alkali-activated fly ash/slag (henceforth simply AFS) and the factors affecting it. A series of tests were conducted to determine the chemical shrinkage, autogenous shrinkage and drying shrinkage. The microstructures and reaction products were also characterized through XRD and SEM/EDS analyses. An increase in the slag content from 10% to 30% resulted in a denser matrix and showed a higher Ca/Si ratio of C–N–A–S–H in the microstructure. Higher sodium silicate and slag contents in a mixture caused more chemical, autogenous, and drying shrinkage, but led to a higher compressive strength. From the test results, it can be concluded that the autogenous shrinkage of AFS mortar occurs mainly due to self-desiccation in hardened state rather than volume contraction by chemical shrinkage in fresh state. The AFS paste showed higher drying shrinkage than ordinary Portland cement (OPC), which may be caused by the higher mesopore volume of the AFS paste compared to that of OPC paste.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Composites - Volume 53, October 2014, Pages 239–248
نویسندگان
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