TY - JOUR
T1 - Alkali Activated Fly Ash-Based Concrete
T2 - Evaluation of Curing Process Using Non-Linear Ultrasonic Approach
AU - Nikvar-Hassani, Arash
AU - Alnuaimi, Hamad N.
AU - Amjad, Umar
AU - Sasmal, Saptarshi
AU - Zhang, Lianyang
AU - Kundu, Tribikram
N1 - Funding Information:
The author Hamad N. Alnuaimi acknowledges the financial support of Qatar University (Doha, Qatar) for his education at the University of Arizona. Dr. Umar Amjad acknowledges partial financial support from Pacific Waves NDT, LLC.
Publisher Copyright:
Copyright © 2021 by ASME.
PY - 2022/5
Y1 - 2022/5
N2 - This paper investigates the applicability of the nondestructive testing and evaluation (NDT&E) method using ultrasonic signals to monitor the curing of alkali-activated fly ash-based concrete (AAFC). The evaluation was carried out on AAFC specimens with two different water/binder (W/B) ratios of 0.3 and 0.5 and after curing at 60 °C for 7, 14, and 28 days, respectively. The signals are recorded and analyzed using linear and non-linear ultrasonic techniques. The results show that the non-linear ultrasonic technique has a clear advantage over the linear ultrasonic technique when monitoring the curing of AAFC specimens with a lower W/B ratio. However, the specimens with the higher W/B ratio do not undergo proper curing and therefore do not show clear distinctions between the curing times measured from the two ultrasonic techniques. The unconfined compressive strength (UCS) of the AAFC specimens at different W/B ratios and curing times is also measured. The UCS results showed a good correlation with the ultrasonic results.
AB - This paper investigates the applicability of the nondestructive testing and evaluation (NDT&E) method using ultrasonic signals to monitor the curing of alkali-activated fly ash-based concrete (AAFC). The evaluation was carried out on AAFC specimens with two different water/binder (W/B) ratios of 0.3 and 0.5 and after curing at 60 °C for 7, 14, and 28 days, respectively. The signals are recorded and analyzed using linear and non-linear ultrasonic techniques. The results show that the non-linear ultrasonic technique has a clear advantage over the linear ultrasonic technique when monitoring the curing of AAFC specimens with a lower W/B ratio. However, the specimens with the higher W/B ratio do not undergo proper curing and therefore do not show clear distinctions between the curing times measured from the two ultrasonic techniques. The unconfined compressive strength (UCS) of the AAFC specimens at different W/B ratios and curing times is also measured. The UCS results showed a good correlation with the ultrasonic results.
KW - alkali activated concrete
KW - class F fly ash
KW - guided waves
KW - linear and nonlinear ultrasonic techniques
KW - nondestructive testing
KW - unconfined compressive strength
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U2 - 10.1115/1.4052952
DO - 10.1115/1.4052952
M3 - Article
AN - SCOPUS:85127281168
SN - 2572-3901
VL - 5
JO - Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems
JF - Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems
IS - 2
M1 - 021006
ER -