Pengaruh Penambahan Admixture Terhadap Nilai Slump dan Kuat Tekan Beton Bleeding

Abstract

In construction projects that occur during the construction or post-construction process, we can often encounter various problems, one of which is damage to fresh concrete such as bleeding in fresh concrete. The condition of the volume of deformed concrete in 1 year at the study site was 307 m3 due to extreme weather conditions (rain) in October - March, the slump value could change due to the fact that the funnel on the mixer truck was not closed. This research was carried out by adding bleeding concrete with admixture. This study aims to determine whether bleeding concrete can return to normal concrete after admixture is added. The method used is an experimental method using 15x15x15 cm cube specimens tested at age, 3 days, 7 days, 14 days, and 28 days. The quality of the concrete used in this study was C40 and C50 with an admixture composition of 0.05%, 0.1% and 0.2%. Based on this study, the slump values ​​for the 0.05% admixture composition for C40 and C50 were 24 and 21 cm, for the 0.1% admixture composition were 18 cm and for the 0.2% admixture composition were 17 and 18 cm. Maximum concrete compressive strength at 28 days of age for 0.1% admixture composition with C40 quality is 45.79 MPa and for C50 quality is 59.14 MPa. The time required for one repair of bleeding concrete at the casting location using admixture is 10 minutes, so that it can be time efficient by 205 minutes or equivalent to a time efficiency of 95.34%. With this admixture can reduce costs by Rp. 54,750,073 or equivalent to 83.45% of the total volume of bleeding of 307 m3.