DefinePK

Abstract

Structure of concrete blocks consist of concrete and reinforcing steel that work together to carry the load acting on the beam. Besides that the steel reinforcement where the use of materials to make concrete is also noteworthy. On the implementation of the field often found sand used for concrete mixes are not eligible. Among these are the levels of sludge that is more than 5 %, so that when it is used to mix concrete sand must be washed first. In this study, researchers will examine whether such additives affect the deflection and bending stress on concrete beams using sand with high mud levels. Tests on the flexural strength of concrete beam in the laboratory by making seven variations of the beam with a size of 20 x 20 x 60 cm, which consists of a variation of 1 is the beam that uses sand Lumajang, variation 2 is beam by using sand Mojokerto, Variation 3 is the beam by using Mojokerto sand plus 15 % fly Ash, variation 4 is a beam that uses sand Mojokerto plus 15 % additive substance, variation 5 is beam by using sand Jombang and variation 6 is a beam that uses sand Jombang plus 13 %. Variation 7 is a beam that uses sand Jombang plus 13 % other additives. The result showed that the concrete beams using sand Jombang with additional material 13 % additive substances able to carry a maximum load of 15,500 kg, with a maximum deflection of 5.1 mm, the bending stress of 504 kg / cm2 and bending moment of 472 500 kgcm. Concrete beams using Jombang sand with the addition of additive 13 % experienced significant improvement to flexural testing at age 28 days.