کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6712689 1428727 2018 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental investigation on the relationship between pore characteristics and unconfined compressive strength of cemented paste backfill
ترجمه فارسی عنوان
بررسی تجربی در مورد رابطه بین ویژگی های منفذ و مقاومت فشاری غیرقابل نفوذ سطحی ریز سیمان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
In this paper, the pore structure characteristics of CPB specimens were characterized using nuclear magnetic resonance (NMR) and scanning electronic microscopy (SEM) techniques, and the relationship between the unconfined compressive strength (UCS) and the pore characteristics of cemented paste backfill (CPB) was investigated. The results showed that the pores in CPB specimens were mainly small, “non-damaging” ones, which accounted for about 70 vol% of all pores in CPB specimens. Although the “damaging” and “multi-damaging” pores only accounted for 3.93 vol% and 6.99 vol% of all pores respectively, they had significant impacts on the UCS of CPB specimens. With the increase of curing time, the porosity of CPB specimens decreased gradually (i.e. the average porosities of CPB specimens at the curing time of 3 d, 14 d and 28 d were 11.07 vol%, 8.58 vol% and 7.09 vol%, respectively). Besides, the porosity of CPB specimens also decreased with the increase of solid concentration of CPB slurry. On the basis of fitting analysis, it could be observed that there was a negatively exponential relationship between the UCS and the porosity of CPB specimens and a linearly inverse relationship between the UCS and the fractal dimension. Our study demonstrates that it is feasible to study the relationship between mechanical properties and pore characteristics of CPB specimens by using the NMR technique.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 179, 10 August 2018, Pages 254-264
نویسندگان
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