A Preliminary Investigation on The Correlation Between the Arrival Time of Ultrasonic Signals and The Concrete Condition. - Farah Aina Jamal Mohamad; Anita Ahmad; Ruzairi Abdul Rahim; Sallehuddin Ibrahim; Juliza Jamaludin; Nasarudin Ahmad; Fazlul Rahman Mohd Yunus; Mohd. Hafiz Fazalul Rahiman; Nur Arina Hazwani Samsun Zaini (AsiaSim (2), 2023)