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All Journal Fondasi: Jurnal Teknik Sipil
Darwis, Zulmahdi
Jurusan Teknik Sipil Universitas Sultan Ageng Tirtayasa
Civil Engineering, Building, Construction & Architecture Transportation

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Experimental Study Comparative Compressive Strength and Tensile Strength of Nail Fiber Concrete Against Fiber Concrete Wiraningrum, Widya; Baehaki, Baehaki; Darwis, Zulmahdi
Jurnal Fondasi Vol 12, No 2 (2023)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fondasi.v12i2.22040

Abstract

Concrete has high compressive strength but weak tensile strength. The innovations to increase tensile strength is addition fiber. Fiber concrete has been proven increase the tensile strength, but the basic material from flammable plastic and difficult to find in Indonesia, making polypropylene fibers less desirable, so an innovation was to add nails to concrete mix as substitute for polypropylene fibers. Nails made of steel, non-flammable, higher melting point than polypropylene, high tensile strength and easy to find in Indonesia. The purpose of this study was to determine the effect of adding nail and polypropylene fiber to the compressive and split tensile strength of concrete, and to determine the optimum proportion of nail fiber to polypropylene fiber concrete. Mix design using SNI 7656:2012. Based on the results, the compressive strength of normal concrete was 20,007 MPa and 1% polypropylene concrete was 20,097 MPa. The compressive strength of nail fiber concrete varies 0,5%, 1%, 1,5%, 2% and 2,5%, respectively, 16,334 MPa, 18,790 MPa, 21,290 MPa, 21,324 MPa, 19,242 MPa. The split tensile strength of normal concrete is 1,834 MPa and 1% polypropylene concrete is 2,361 MPa. The split tensile strength of nail fiber concrete varies 0,5%, 1%, 1,5%, 2% and 2,5%, respectively, 1,620 MPa, 1,990 MPa, 1,942 MPa, 1,800 MPa, and 1,730 MPa. The optimum proportion of nail fiber concrete as substitute for 1% polypropylene fiber concrete is variation of 1,5% with compressive strength of 21,290 MPa and split tensile strength of 1,942 MPa.
The Effect of Using PVAc (Polyvinyl Acetate) & Epoxy Resin Adhesives on the Shear Strength of Laminated Bamboo Darwis, Zulmahdi; Soelarso, Soelarso; Riyadi, Andry Afrizal
Jurnal Fondasi Vol 13, No 1 (2024)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fondasi.v13i1.24920

Abstract

The use of wood as a construction material is common throughout Indonesia. Based on this, wood material is easy to obtain and wood material itself can make buildings look more attractive. Wood as a source of materials for both construction and non-construction makes the price of wood increase and makes rainforests that function to protect the environment threatened with loss as well as the ecosystem in it. One material that is suitable for replacing wood is bamboo. Bamboo is easy to plant, breed, fast in growth, and of course the price is relatively cheap. The hollow or empty interior of bamboo often makes it difficult for users to utilise bamboo, therefore bamboo lamination technology is applied to facilitate the manufacture of building construction components. The purpose of this study is to determine the shear strength value of bamboo laminates using PVAc adhesive and epoxy resin adhesive and to determine the damage pattern on bamboo laminated beams after shear strength testing when using PVAc adhesive and Epoxy Resin adhesive. The tests carried out refer to SNI 03-3400-1994 using test specimens in the form of laminated bamboo beams with 2 variations of lamination, namely with PVAc and epoxy resin adhesives. Based on the tests carried out, the shear strength of laminated bamboo beams using epoxy resin adhesive is stronger with an average value of 6.7206 MPa compared to laminated bamboo beams using PVAc adhesive with an average value of 2.7949 MPa. The damage pattern that occurs in the adhesive part is damaged during maximum load with the bamboo slats detaching from the adhesive in the epoxy resin adhesive and in the PVAc adhesive the glue part is lifted.
Co-Authors Baehaki, Baehaki Riyadi, Andry Afrizal Soelarso, Soelarso Wiraningrum, Widya