Armin Naibaho
(Staf pengajar Jurusan Teknik Sipil, Politeknik Negeri Malang)
ABSTRACT: Toughness is a measure which indicates the energy needed to happen propagation fracture/disintegration. This rigidity is often known as toughness. So perseverance is the rate of collapse of structures as determined by the ability of the material in order to dissipate energy. The purpose of this study are to examine the study for the Study of factors influence cement ais (fas) for normal concrete toughness. How to study includes the selection of materials ΓΈ20mm size of coarse aggregate; sieve 38 mm and 19 mm sieve and suspended fine, testing the physical properties of materials, mix design, specimen, density testing, self weight and compressive strength of specimens, as well as conclusion.The study shows: under FAS, it appears that the mixture containing the lowest FAS, namely 0:35 to give the value of compressive strength and modulus of elasticity is higher. When dipersentase visible; on FAS 0.45 = 20.98 MPa, increasing to 23.36 MPa at FAS 0.40 (11.34%) and increased to 26.68 MPa at FAS 0.35 (27.17%) . Also, the greater the compressive strength value achieved will show more ductile concrete. This can be seen from the value of Stress Intensity / Stress Intensity Factor (K) for the FAS 0.45 = 0.8267 N / m, rising to 0.8664 N / m at FAS 0.40 (4.80%) and increased to 0 , 9088 N / m at FAS 0.35 (9.93%).
Keywords: Coarse Aggregates, Water Factor Cement, Compressive Strength of Concrete and Incredulity
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