Electronic Theses and Dissertation

Ferrocement adalah beton pracetak yang telah dikenal lama, namun penggunaan mortar beton normal menghasilkan panel pracetak yang berat. penggunaan beton ringan seperti beton busa sebagai pengganti matriks pada material ferrocement, disebut ferrofoam concrete, dapat mengatasi masalah ini. namun, beton busa memiliki kuat tarik rendah dan sifat getas, sehingga perlu modifikasi seperti penambahan serat. penelitian ini menguji kuat tarik pelat ferrofoam concrete dengan matriks beton busa sg 1,4 dengan 10% tanah lempung bentonit dan penambahan 0,5% serat polyethylene, variasi panjang 10 mm dan 15mm. tujuannya mengidentifikasi pengaruh serat polyethylene dengan panjang berbeda terhadap kapasitas tarik dan retak pelat ferrofoam concrete. pengujian kuat tekan dan tarik belah beton busa juga dilakukan. benda uji yang digunakan berupa pelat ferrofoam concrete 400 x 100 x 20 mm dengan 4 lapis wiremesh untuk pengujian tarik pelat serta silinder 100 x 200 mm untuk pengujian kuat tekan dan tarik belah beton busa. metode pengujian mengacu pada standar aci 549.1r-93 untuk ferrofoam concrete dan sni 1974:2011 serta sni 2401:2014 untuk beton busa. hasil penelitian ini menunjukkan bahwa penambahan serat pada beton busa dapat meningkatkan kapasitas tarik, serat lebih panjang memberikan hasil lebih baik, kuat tarik belah beton berserat 15mm mencapai 13,84% kuat tekan beton. beton busa berserat 10mm dan tanpa serat memiliki rasio kuat tarik belah terhadap kuat tekan 12,10% dan 11,54%. penambahan serat juga meningkatkan kapasitas retak pelat ferrofoam concrete, penambahan serat yang lebih panjang juga menunjukkan peningkatan kapasitas retak yang lebih baik. tegangan retak rata-rata pelat tanpa serat 0,3 mpa, serat 10mm 0,9 mpa dan serat 15mm 1,5 mpa.

Ferrocement is a precast concrete that has been well-known for a long time; however, the use of normal concrete mortar results in heavy precast panels. The utilization of lightweight concrete, such as foam concrete, as a substitute for the matrix in ferrocement, termed as ferrofoam concrete, can overcome this issue. However, foam concrete possesses low tensile strength and brittle properties, necessitating modifications such as fiber addition. This study examines the tensile strength of ferrofoam concrete plates with a foam concrete matrix of SG 1.4 with 10% bentonite clay and the addition of 0.5% polyethylene fibers, with lengths of 10mm and 15mm. The aim is to identify the influence of different lengths of polyethylene fibers on the tensile capacity and crack behavior of ferrofoam concrete plates. Compressive and splitting tensile tests were also conducted on foam concrete. Test specimens included 400 x 100 x 20 mm ferrofoam concrete plates with 4 layers of wiremesh for the plate tensile test and 100 x 200 mm cylinders for foam concrete compressive and splitting tensile tests. Testing methods followed ACI 549.1R-93 standards for ferrofoam concrete and SNI 1974:2011 and SNI 2401:2014 standards for foam concrete. The results of this study indicate that fiber addition to foam concrete enhances its tensile capacity, with longer fibers yielding better results. Tensile splitting strength of 15mm fiber-reinforced foam concrete reached 13.84% of the compressive strength of concrete. Fiber-reinforced foam concrete with 10mm fibers and without fibers exhibited split tensile to compressive strength ratios of 12.10% and 11.54%, respectively. Fiber addition also increased the crack capacity of ferrofoam concrete plates, with longer fibers showing improved crack resistance. The average crack stress of plates without fibers was 0.3MPa, while those with 10mm and 15mm fibers were 0.9MPa and 1.5MPa, respectively.