Modifikasi Beton Normal Sebagai Rigid Pavement Yang Memenuhi Syarat Kuat Lentur

Abstract

Minimum specification of concrete flexural strength for rigid pavement structure is 4.5 MPa. If it is estimated, the concrete quality that meets these requirements is f'c 41. To get concrete f'c 41 requires very good material, measurable methods of implementation and strict supervision. Therefore, the procurement of concrete is very expensive. In addition to price issues, the provision of coarse aggregates with specific gravity above 2.5 in Bali Province is still difficult. Under these conditions, normal concrete is designed but meets the requirements by 1) adding wire fibers with a variation of 0.5%, 0.75%, 1%, 3% and 5% of the concrete weight and 2) giving a layer of carbon fiber under a layer of concrete without resin adhesive. The results of the study revealed that the addition of wire fibers of less than 5% turned out to make the value of flexural strength lower than without wire, so that at 5% wire content the flexural strength slightly exceeded the flexural strength without wire. The value of flexural strength without wire is 4.57 MPa, flexural strength with a 5% wire content is 4.94 MPa, resulting in a difference of 0.44 MPa or greater 9.47%. For flexural strength with carbon fiber layer at the bottom, the value of flexural strength increased significantly to 5.63 MPa or about 25.10%. This is understandable because carbon fiber has a high tensile strength   pecification and is the main material in retrofit activity.

Kata kunci : rigid pavement, flexural strenght, wire fibers, carbon fiber