Effect of Water-Cement Ratio on Fracture Energy based on Work of Fracture Adelfy Dara Arianti (a*). Resmi Bestari Muin (a*). Agnes Hanna Patty (b*)
a) Civil Engineering, Mercu Buana University Jl. Meruya Selatan No. 1, Meruya Selatan, Kec. Kembangan, DKI Jakarta 11650, Indonesia *adelfydaraarianti[at]gmail.com *resmi.bestari[at]mercubuana.ac.id
b) Civil Eningeering, Katolik Widya Karya Malang University, Jl. Bondowoso 2-Malang No. 2, Gading Kasri, Kec. Klojen, Kota Malang, Jawa Timur 65115, Indonesia *agneshpatty[at]gmail.com
Abstract
Concrete are brittle material is generally consists of many micro cracks which are potential sources of crack propagation that lead to the possibility of catastrophic failure (rapid or catastrophically) resulting in fracture of the concrete structure under service load. The relationship of fracture energy with material properties has not been clearly identified, with most studies showing insensitivity relative to the water-cement ratio where cracks in concrete propagate particularly along the cement-aggregate interface. This study was an experiment on the effect of water-cement ratio on fracture energy based on RILEM method with several tests such as compressive strength, modulus elasticity and flexural strength. Fracture energy was measured through a three-point-bending test of notched concrete beams. The configuration of the beams was 20x10x120 cm with the ratio of notch to depth was 0.25 and the loading rate was 0.05 mm/min. The testing controlled by midspan deflection which produced a load-displacement curve. Concrete mixtures contain crushed aggregate with maximum sizes of 19 mm are tested at ages 28 days and have water-cementitious (w/cm) ratios are 0.30, 0.40 and 0.6. The correlation between fracture energy and water-cement ratio are characterized by the fracture energy does not increase while the compressive strength is increase. This can be seen when concrete which contains a lower water-cement ratio (0.3) tends to have a rather high compressive strength but decreased the fracture energy.
Keywords: compressive strength; modulus elasticity; fracture energy; water-cementitious ratio
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