Pengaruh Arang Tempurung Kelapa Terhadap Kuat Tekan Mortar

Arang tempurung kelapa adalah bahan tambahan (Admixture) yang termasuk dalam bahan pozolan buatan. Penelitian ini bertujuan untuk mengetahui nilai kuat tekan mortar pada persentase variasi penambahan arang tempurung kelapa sebesar 0%, 2%, 4%, 6% dan 8%. Benda uji yang digunakan adalah kubus mortar dengan ukuran 5 cm x 5 cm x 5 cm. Jumlah benda uji untuk setiap perlakuan adalah 6 buah dengan umur pengujian 7, 14, 21 dan 28 hari. Dari  hasil pengujian menunjukkan nilai kuat tekan mortar akan menurun untuk semua variasi penambahan jika dibandingkan dengan mortar normal (tanpa bahan tambahan

METODE ELEMEN HINGGA DENGAN PROGRAM MATLAB DAN APLIKASI SAP 2000 UNTUK ANALISIS STRUKTUR CANGKANG

Metode Elemen Hingga merupakan metode numeris yang sangat populer dalam penyelesaian masalah – masalah mekanika kontinum, tegangan – regangan, gaya – gaya dalam serta perpindahan pada struktur yang linear maupun non linear. Kepoluleran Metode Elemen Hingga ini karena kemudahan formulasinya terutama dengan meningkatnya pengetahuan dan teknologi komputerisasi. Dalam kajian ini, ditinjau analisa struktur cangkang dengan formulasi Elemen Hingga dibuat dalam program MATLAB dan aplikasi Software SAP 2000. Pada program MATLAB, Formulasi perilaku cangkang diidealisasi dengan pendekatan pelat datar sebagai bentuk superposisi perilaku lentur dan membran serta kontribusi geser. Berkaitan dengan Matriks Kekakuan maka dibuat dalam bentuk perumusan isoparametrik dengan integrasi numeris Gauss – Legendre. Untuk aplikasi Software SAP 2000 digunakan elemen cangkang tipis. Hasil analisis untuk lendutan maksimum menggunakan program MATLAB dengan tingkat akurasi 5,25% pada 16 elemen, serta Software SAP 2000 dengan tingkat kesalahan 0,52% pada 36 elemen

PENGARUH PENGGUNAAN ABU SEKAM PADI SEBAGAI PENGGANTI SEBAGIAN TANAH LIAT TERHADAP KUAT TEKAN BATU BATA MERAH

Perilaku kuat tekan adalah salah satu parameter penting dalam analisa suatu elemen struktur. Penelitian batu bata merah sebagai komponen dalam konstruksi dan merupakan salah satu aplikasi dari analisa perilaku kuat tekan. Beberapa hasil kajian mengemukakan bahwa pembuatan batu bata merah dapat dikembangkan dengan cara ilustrasi yaitu menggunakan material lain sebagai bahan pengganti sebagian tanah liat. Salah satunya adalah bahan abu sekam padi. Dalam penelitian ini yang diteliti adalah penyerapan air, kerapatan dan kuat tekan. Adapun tujuan penelitian ini yaitu guna mengetahui sifat fisis batu bata merah, mengetahui daya serap air dan kerapatan batu bata merah serta mengetahui nilai presentase kuat tekan optimum batu bata merah. Adapun komposisi campuran antara tanah liat dan abu sekam padi yaitu 0% dan 20 kg, 5% dan 19 kg, 10% dan 18 kg, 15% dan 17 kg. Berdasarkan hasil pengujian nilai penyerapan air diantara komposisi 0% - 15% didapat nilai komposisi 10% campuran abu sekam padi dan tanah liat sebesar 19.73%. Hal ini disebabkan penambahan 10% abu sekam padi mampu memperkecil penyerapan air sesuai syarat SNI-15-2094-2000. Tingkat penyerapan air maksimum batu bata merah sebesar 20%. Adapun pengujian nilai kerapatan batu bata merah diantara komposisi 0% - 15% didapat nilai komposisi 10% campuran abu sekam padi dan tanah liat sebesar 0.888 g/cm3 dan pengujian kuat tekan batu bata merah antara komposisi 0% - 15% didapat nilai komposisi 10% campuran abu sekam padi dan tanah liat sebesar 54.64 kg/cm2

Pengaruh Penambahan Polypropylene Fiber Mesh Terhadap Sifat Mekanis Beton

Polypropylene fiber is the fiber type of plastic (polypropylene) which is a special production with high technology. It is a chemical compound with the formula C3H6 hydrocarbons in the form of a single filamentor thin fibrous tissue shaped nets with a length of 6 mm to 50 mm and has a diameter of 8-90 microns. Thesefibers can be used to improve the performance of concrete.This research aims to determine how much influence the addition of polypropylene fibers on mechanicalproperties of concrete (compressive strength. split tensile strength and flexural strength). polypropylenefibers used doses of 0; 0.40 kg/m³, 0.60 kg/m³, 0.80 kg/m³ of concrete, which is made on the type of concretef'c 20 MPa with the value of water cement factor (FAS) at 0.53. Calculation of mixed concrete plans usingguidelines DOE (Department of Environment). The research location at Concrete and Building MaterialsLaboratory of the Faculty of Engineering, University Tadulako Palu. Specimens made as many as 72 piecesof 60 cylinders (D15 x 30 cm ³) and a beam of 12 pieces (15 x 15 x 60 cm ³). Specimen testing performed at28 days.Test results obtained fiber concrete compressive strength, split tensile strength and flexural strength, higherthan normal concrete. Compressive strength testing of optimum values obtained at doses 0.60 kg/m³. with anincrease of 3.62% compared to normal concrete. From testing split tensile strength and flexural strengthoptimum values obtained of each at doses of 0.65 kg/m³ and 0.58 kg/m³. For the split tensile strengthincreased 20.44% and flexural strength increased 11.26% compared to normal concrete

PANEL BETON BERTULANGAN BAMBU SEBAGAI ALTERNATIF BAHAN KONSTRUKSI

The use of natural materials for construction purposes should be developed. Special reinforced concrete construction, in some cases, the compressive strength is not a determining factor, but rather ductility. On the other hand, bamboo is a natural material has a ductile properties sufficient to be used as reinforcement. For this type of bamboo lear, some properties that are important to note is the compressive strength , σ//= 39.89 MPa,  σ┴ = 5.55 MPa, Shear strength is 7.644 MPa  and tensile strength is 207.523 MPa. In addition, the physical properties of mortar material used is weight of contents of cement is 1.25 gr/cm3, weigtht ofcontent of sand is 1.60 gr/cm3.From the test results it can be concluded that the test samples for concrete mix bamboo panel with division 1 cement and 4 sand did not change significantly so that the maximum load obtained for testing age from 7 days to 21 days also resulted in maximum load that is not much different. Thus the utilization of bamboo reinforced concrete panels for the purpose of the wall can be done, although it still requires further development

PENGARUH BAHAN TAMBAH PLASTIMENT-VZ TERHADAP SIFAT BETON

Concrete mixture for structure of the building is expected to according to the quality and specifications desired. With the addition of admixtures materials used for concrete mix, it is necessary to know the type, properties and benefits of admixture produced by various companies. Concrete used In this study were added admixtureof Plastiment-VZ for characters investigated.In this study used two variations of concrete, ie normal concrete and concrete with the addition PlastimentVZ with usage percentage of 0.20%, 0.40% and 0.60% of the weight of the cement used in normal concrete. Cylindrical specimens used for compressive strength testing with a total of 3 pieces for each test.The test results obtained average compressive strength of normal concrete (f'cr) of 27.554 MPa, and for concrete with the addition of-VZ Plastiment of 0.20% obtained an average compressive strength, f'cr = 29.252 MPa, the concrete with the addition of Plastiment-VZ 0.40%, obtained f'cr = 30.951 MPa, whereas the addition of 0.60% for the compressive strength at 28 days obtained at 32.083 MPa.Keywords: Compressive strength, Plastiment-V

PENGARUH PENAMBAHAN POLYPROPYLENE FIBER MESH TERHADAP SIFAT MEKANIS BETON

Polypropylene fiber is the fiber type of plastic (polypropylene) which is a special production with high technology. It is a chemical compound with the formula C3H6 hydrocarbons in the form of a single filamentor thin fibrous tissue shaped nets with a length of 6 mm to 50 mm and has a diameter of 8-90 microns. Thesefibers can be used to improve the performance of concrete.This research aims to determine how much influence the addition of polypropylene fibers on mechanicalproperties of concrete (compressive strength. split tensile strength and flexural strength). polypropylenefibers used doses of 0; 0.40 kg/m³, 0.60 kg/m³, 0.80 kg/m³ of concrete, which is made on the type of concretef'c 20 MPa with the value of water cement factor (FAS) at 0.53. Calculation of mixed concrete plans usingguidelines DOE (Department of Environment). The research location at Concrete and Building MaterialsLaboratory of the Faculty of Engineering, University Tadulako Palu. Specimens made as many as 72 piecesof 60 cylinders (D15 x 30 cm ³) and a beam of 12 pieces (15 x 15 x 60 cm ³). Specimen testing performed at28 days.Test results obtained fiber concrete compressive strength, split tensile strength and flexural strength, higherthan normal concrete. Compressive strength testing of optimum values obtained at doses 0.60 kg/m³. with anincrease of 3.62% compared to normal concrete. From testing split tensile strength and flexural strengthoptimum values obtained of each at doses of 0.65 kg/m³ and 0.58 kg/m³. For the split tensile strengthincreased 20.44% and flexural strength increased 11.26% compared to normal concrete. Keywords: polypropylene fibers. mechanical properties of concrete