Alkali Activated Fly Ash-Based Concrete: Evaluation of Curing Process Using Non-Linear Ultrasonic Approach

Arash Nikvar-Hassani, Hamad N. Alnuaimi, Umar Amjad, Saptarshi Sasmal, Lianyang Zhang, Tribikram Kundu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


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.

Original languageEnglish (US)
Article number021006
JournalJournal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems
Issue number2
StatePublished - May 2022


  • alkali activated concrete
  • class F fly ash
  • guided waves
  • linear and nonlinear ultrasonic techniques
  • nondestructive testing
  • unconfined compressive strength

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Safety, Risk, Reliability and Quality
  • Mechanics of Materials


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