ANALYSIS OF THE INFLUENCE OF LOADING RATE ON UNCONFINED COMPRESSIVE STRENGTH CONCRETE SAMPLES

• Main Author: OCTAVIANSYAH (NIM : 12103024); Pembimbing : Dr. Ir. Suseno Kramadibrata M.Sc., FARIZ
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/18457
• Institution: Institut Teknologi Bandung

One of the most commonly known test for rock mechanics is unconfined compressive strength (UCS) test. On UCS test, cylindrical rock samples were pressed under one stress component (uniaxial) until it reached failure and as a final results, will provide mechanical rock properties described as uniaxial compressive strength (c), elasticity modulus (E), Poisson’s ratio (), and stress – strain curve. <br /> <br /> <br /> One of factors that influence UCS test results is the loading rate. Therefore, the objective of this research is to study the influence of loading rate to mechanical properties of concrete samples on UCS test. Some scientists had conduct same research about influence of loading rate on unconfined compressive strength, such as Abrams (1917), Jones and Richart (1936), Watstein (1953), Cowell (1966), Atchley and Furr (1967), Takeda and Tachikawa (1971), Sparks and Menzies (1973), Evan (1958), Wakabayashi et al. (1980), Fu, Erki, and Seckin (1991), and Bischoff and Perry (1991). <br /> <br /> <br /> In this research, concrete samples (with cement to sand ratio 1 : 1), were tested with unconfined compressive strength test at loading rate based on range from 0,024 MPa/s to 0,003 MPa/s (8 – 65 minutes). Based on this research, the results shown that uniaxial compressive strength (c) were dropt as much as 8,38% according to the dropt of the loading rate, Average Young's modulus (EAv) were raised as much as 1,5% according to the dropt of the loading rate, Secant Young's modulus (Esec) were dropt as much as 15,73% according to the dropt of the loading rate, Tangent Young's modulus (Etan) were dropt as much as 13% according to the dropt of the loading rate, Poisson's ratio () were dropt as much as 17,39 % according to the dropt of the loading rate, and the loading rate did not shown any significant influences to the slope changing in stress – strain curve.