Effect of Concrete Class, Maximum Aggregate Size and Specimen Size on the Compressive Strength of Cores and Cast Specimens

Abstract Core sampling is the most accurate method of evaluating compressive strength concrete structures. However, it preferable to take only small cores avoid damaging It turns out that various elements influence compressed cores. This study examines specimen size, aggregate class, and curing on strength. Three aggregates measuring 3/8, 8/15, 15/25 mm are used make six sets compositions with strengths 25 MPa 30 MPa. Nine specimens made, one for each variety concrete. Cores 100 mm, 75 50 sizes made. These extracted from blocks in outside air simulate real environment. Cast cured water diameters 150 also The objective compare average all cast or cylindrical standard diameter 150/300 specimens. obtained findings showed overestimated when we f p100 air-cured (f c ), a conversion factor varying 0.69 0.96. decrease observed comparison water-cured use p75 reduced factors, which between 0.83 0.87 B25 highest p /f ratios c50 cores, can reach 1.24. size core class have much greater ratios.