کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7884733 1509717 2018 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Determination of mortar setting times using shear wave velocity evolution curves measured by the bender element technique
ترجمه فارسی عنوان
تعیین زمان تنظیم ملات با استفاده از منحنی تکامل سرعت موج برشی با استفاده از روش عنصر خمشی اندازه گیری شد
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
چکیده انگلیسی
Although identified as a good indicator to characterize freshly cast cementitious materials, shear wave velocity (Vs) alone has not been used successfully to determine the initial and final setting times (ti and tf). The challenge originates from the large Vs range that can vary from <50 m/s to >2000 m/s for cementitious materials at early age (typically <24 h). To overcome these challenges, modifications to traditional bender element and to specimen geometry were made to obtain Vsversus time (Vs(t)) curves of six early age mortars at different water-to-cement ratios, some with chemical admixtures. Derivative methods were then proposed to obtain ti and tf. The peak time (tpeak′) in the first-order derivative of Vs(t) curves correlate well to the final setting time (R2 = 0.979), while the peak time (tpeak″) of the second-order derivative of Vs(t) curves correspond well to the initial setting time (R2 = 0.950).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 106, April 2018, Pages 1-11
نویسندگان
, , , ,