Hubungan Kuat Tekan dan Kuat Tarik Belah Beton dengan Serat Bambu dari Tusuk Gigi Sebagai Bahan Tambah

The low value of the tensile strength of concrete is the biggest weakness that can cause the construction to crack easily if it is subjected to tensile stress. One type of research in an effort to improve the weakness of concrete is by adding fiber which is expected to increase the tensile strength of the concrete. In this study, the fiber used is bamboo fiber. To ensure uniformity in the shape and size of the fibers, bamboo fibers that have been processed in the form of toothpicks are used. The toothpicks used are 1.5 mm in diameter and 25mm long. This study uses several percentages of fiber, namely 0.5%; 1.0%; 1.5% and 2.0% by volume of concrete. The test carried out is the slump test, compressive strength and split tensile strength The compressive strength and split tensile strength tests were tested when the concrete was 28 days old. The results of this study indicate that the concrete reaches a maximum compressive strength at a fiber percentage of 1.0% of 34.90 MPa with an increase of 31.20% from normal concrete and the split tensile strength value reaches a maximum value at a percentage of 0.5% fiber of 4, 01 MPa with an increase of 22.76% than normal concrete. The empirical relationship between compressive strength and split tensile strength at fiber variation is 0.5%; 1.0%; 1.5% and 2.0% is 0.76√fc '; 0.51√fc '; 0.54√fc 'and 0.54√fc'.