Electronic Theses and Dissertation

Beton mutu tinggi merupakan beton yang memiliki kuat tekan di atas 41,4 mpa. campuran beton mutu tinggi membutuhkan lebih banyak semen sebagai solusi digunakan tanah diatomae sebagai pengganti sebagian semen. penggunaan serat merupakan solusi untuk mencegah terjadinya penyusutan, karena serat dapat meningkatkan kinerja beton dalam menahan retak. serat rami dan serat abaka digunakan karena bersifat alami, biaya yang ekonomis dan memiliki kuat tarik yang tinggi. tujuan penelitian ini adalah mengetahui pengaruh penambahan serat rami dan serat abaka terhadap susut pada beton mutu tinggi dengan menggunakan tanah diatomae sebagai subtitusi semen. penelitian dilakukan dengan menggunakan balok beton berukuran 100 mm × 100 mm × 400 mm sebanyak 16 benda uji. variasi penambahan serat rami dan serat abaka adalah 0%, 0,60%, 0,75%, dan 0,90% dari volume beton. penambahan tanah diatomae dengan variasi 0% dan 10% dari berat semen, dengan fas 0,27. pengamatan dilakukan selama 60 hari. hasil penelitian menunjukkan bahwa penambahan serat rami dan serat abaka berpengaruh mengurangi penyusutan. pada umur 60 hari, penambahan serat sebesar 0,60%, 0,75%, dan 0,90% jika dibandingkan dengan benda uji 0% serat menunjukkan penurunan susut pada penambahan serat rami masing-masing sebesar 35%, 49%, dan 64% pada benda uji tanah diatomae 0%, dan 34%, 54%, dan 68% pada benda uji tanah diatomae 10%. sementara itu, penambahan serat abaka menunjukkan penurunan susut sebesar 37%, 45%, dan 65% pada benda uji tanah diatomae 0%, dan 38%, 54%, dan 70% pada benda uji tanah diatomae 10%.dari hasil pengamatan nilai regangan susut yang terjadi pada benda uji dengan substitusi 0% tanah diatomae lebih besar daripada benda uji dengan substitusi 10% tanah diatomae. kata kunci: beton mutu tinggi, susut, serat rami, serat abaka, tanah diatomae

High-strength concrete is a concrete that has a compressive strength above 41.4 MPa. High-strength concrete mixes require more cement as a solution to use diatomaceous earth as a partial replacement for cement. The use of fiber is a solution to prevent shrinkage, due to fiber can improve the performance of concrete by resisting cracking. Ramie fiber and abaca fiber are used because they are natural, economical, and have high tensile strength. The purpose of this study was to determine the effect of the addition of ramie fiber and abaca fiber on shrinkage in high-quality concrete using diatomaceous earth as a substitute for cement. This research was conducted using concrete blocks measuring 100 mm × 100 mm × 400 mm with total of 16 specimens. Variations in ramie fiber and abaca fiber addition were 0%, 0,60%, 0,75%, and 0,90% for concrete volume. The addition of diatomaceous earth was 0% and 10% by weight of cement, with 0,27 water-cement ratio. Observations were made for 60 days. The results show that the addition of ramie fiber and abaca fiber reduced shrinkage. At the age of 60 days, the addition of fibers of 0,60%, 0,75%, and 0,90%, when compared with 0% of fiber specimens, showed a decrease in shrinkage in the addition of ramie fiber by 35%, 49%, and 64%, respectively, in 0% substitution of diatomaceous earth and 34%, 54%, and 68% in 10% substitution of diatomaceous earth. Meanwhile, the addition of abaca fiber showed a decrease in shrinkage of 37%, 45%, and 65%. The addition of abaca fiber showed a decrease in shrinkage of 37%, 45%, and 65% in the 0% substitution of diatomaceous earth and 38%, 54%, and 70% in the 10% substitution of diatomaceous earth. From the observations, the shrinkage strain value that occurred in the specimen with 0% diatomaceous earth substitution was more significant than the specimen with 10% diatomaceous earth substitution. Keywords: high-quality concrete, shrinkage, ramie fiber, abaca fiber, diatomaceous earth