THE EFFECT OF TEMPERATURE ON ULTRASONIC PULSE VELOCITY AND STRENGTH OF CONCRETE SAMPLES UNDER CYCLIC LOADING USING THE IMPACT TEST METHOD

• Main Author: Khoirun Ni'am, Ahmad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/85353
• Institution: Institut Teknologi Bandung

In certain mining conditions, such as underground coal gasification, drilling, and blasting, rocks are exposed to high temperatures and repeated dynamic loading. These conditions can drastically reduce the strength of rocks from their natural state, and the same applies to concrete. Numerous studies have been conducted separately to investigate the effects of heat and repeated dynamic loading on the mechanical properties of concrete. This study aims to examine the combined effects of high temperatures and varying impact heights on repeated loading on the ultrasonic pulse velocity (UPV) and uniaxial compressive strength (UCS) of concrete. Concrete samples were made from a 2:1 sand-to-cement ratio and then tested at various temperatures and impact heights using the impact test method, including UPV and UCS testing. The results indicate that increasing temperature and impact height leads to a reduction in the ultrasonic pulse velocity and uniaxial compressive strength of the concrete. The decrease in Vp and Vs as the temperature rises from room temperature (25 ?) to 400 ? in concrete follows a linear equation, with reductions of 33.9% and 35.3% for a drop height of 30 cm, and 30.1% and 34.8% for a drop height of 70 cm, respectively. The reduction in UCS values as the temperature rises from 25 ? to 400 ? in concrete also follows a linear equation, with reductions of 25.1% and 29.4% for drop heights of 30 cm and 70 cm, respectively.