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As'ad, Sholihin
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PENGARUH DOSIS DAN ASPEK RASIO SERAT BAJA TERHADAP KUAT TEKAN DAN MODULUS ELASTISITAS PADA BETON NORMAL DAN BETON MUTU TINGGI Musyaffa, Dwi Nuur; As'ad, Sholihin; Wibowo, Wibowo
Matriks Teknik Sipil Vol 3, No 2 (2015): Juni 2015
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (549.614 KB) | DOI: 10.20961/mateksi.v3i2.37196

Abstract

Masalah yang sering muncul dalam hal penggunaan beton adalah sifatnya yang getas. Kuat tekan beton yang semakin besar maka beton mempunyai daktilitas yang rendah.. Penambahan serat diharapkan dapat mengatasi hal tersebut. Serat baja dapat menambah penyerapan energi yang lebih besar dan meningkatkan daktilitas beton. Karakter dari beton serat dipengaruhi oleh tipe material serat, geometri serat, distribusi serat, orientasi serat, dan konsentrasi serat. Penelitian ini mencari besar pengaruh dosis serat yang ditambahkan dan aspek rasio serat baja yang berbeda pada beton normal dan beton mutu tinggi. Penelitian ini dilakukan untuk mengetahui karakteristik beton yaitu kuat tekan, modulus elastisitas, dan disrtibusi serat. Penelitian ini menggunakan metode eksperimen dengan menggunakan 54benda uji, 3 benda uji untuk setiap variasi penambahan serat antara lain 0 kg/m3, 20 kg/m3, 40 kg/m3, 60 kg/m3, dan 80 kg/m3. Serat yang digunakan adalah tipe serat end hooked dengan 2 aspek rasio(l/d) yang berbeda yaitu RC 80/60 BN (tipe A) dan RC 65/35 BN (tipe B). Masing- masing benda uji digunakan untuk pengujian kuat tekan dan modulus elastisitas. Ukuran benda uji yang digunakan adalah silinder dengan ukuran diameter 15 cm dan tinggi 30 cm. Pengujian dilakukan setelah beton berumur 28 hari. Hasil pengujian menunjukkan bahwa penambahan dosis serat baja sebesar 60 kg/m3menghasilkan kuat tekan dan nilai modulus elastisitas maksimum kecuali pada beton mutu tinggi aspek rasio 80. Besar kenaikan kuat tekan maksimum pada beton normal sebesar 10,54% (tipe A) dan 10,81% (tipe B) dan beton mutu tinggi sebesar 12,41% (tipe A penambahan 80 kg/m3) dan 12,41%. Peningkatan maksimum nilai modulus elastisitas pada beton normal adalah 25,10% pada tipe B sedangkan pada beton mutu tinggi sebesar 10,98% pada tipe A. Jumlah serat pada saat pemeriksaan distribusi pada beton segar dan beton setelah diuji terhadap jumlah serat teoritis terdapat perbedaan.Dosis serat lebih berpengaruh terhadap kenaikan kuat tekan dan modulus elastisitas daripada jumlah seratnya.
PENGARUH PENGGUNAAN ELEKTROOSMOSIS TERHADAP TEKANAN AIR PORI PADA TANAH LEMPUNG Majid, Abdul; Surjandari, Niken Silmi; As'ad, Sholihin
Matriks Teknik Sipil Vol 1, No 4 (2013): Desember 2013
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (486.724 KB) | DOI: 10.20961/mateksi.v1i4.37489

Abstract

Tanah lempung dengan kadar air tinggi kurang memenuhi syarat sebagai tempat mendirikan suatu bangunan Elektroosmosis adalah salah satu metode perbaikan tanah lempung dengan pengaturan drainase menggunakan arus searah (DC) secara langsung. Tujuan penelitian ini adalah mengetahui pengaruh penggunaan elektroosmosis terhadap tekanan air pori tanah lempung. Metode elektroosmosis dibuat model fisik di laboratorium. Bahan elektroda adalah tembaga dengan konduktivitas listrik yang tinggi, yaitu sebesar 6 x 107 ?m. Model elektroosmosis dalam bentuk box ukuran 30x30x15 cm dengan variasi beda potensial 0, 3, 6, 9 dan 12 volt. Uji elektroosmosis diberi perlakuan tanpa preloading dan dengan preloading. Pengamatan yang dilakukan adalah ketinggian muka air tanah untuk mendapatkan nilai tekanan air pori dengan pengamatan setiap 24 jam selama 3 hari pengujian. Hasil penelitian menunjukkan bahwa semakin tinggi beda potensial yang diberikan pada uji model elektroosmosis kondisi tanpa preloading dan dengan preloading semakin besar dan semakin cepat penurunan tekanan air pori dengan penurunan terbesar terjadi pada beda potensial 12 Volt. Pada kondisi tanpa preloading dan dengan preloading. penurunan tekanan air pori terbesar dan tercepat terjadi di daerah anoda. Uji model elektroosmosis pada kondisi preloading mengalami penurunan tekanan air pori yang lebih besar dan lebih cepat daripada kondisi tanpa preloading.
KUAT TEKAN, POROSITAS DAN PERMEABILITAS PERVIOUS CONCRETE DENGAN CAMPURAN AGREGRAT LIMBAH GERABAH Puji Astutik, Herna; As'ad, Sholihin; Basuki, Achmad
Matriks Teknik Sipil Vol 2, No 1 (2014): Maret 2014
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (332.675 KB) | DOI: 10.20961/mateksi.v2i1.37477

Abstract

One of an effort to reduce water runoff and increase infiltration into the soil is environment-based pervious concrete drainage technologies. As amixture of aggregate, the waste of burned clay fraction in the pervious concrete had its own advantages. The waste of burned clay aggregate is goodin a strength, and bigger pores than concrete. This study aims to determine the compressive strength, porosity, permeability recycle of waste ofburned clay ; the relationship between compressive strength and porosity; and the relationship between porosity and permeability of the perviousconcrete with a mixture. This research was in laboratory experimental method. Samples were cylinder pervious concrete with of coarse gravelaggregate with burned clay fraction by 0%, 44.6%, 50.9% and 100%. Each mixture consisted of three test specimens. Specimens of compressivestrength test was cylinder form in 15 cm diameter and 30 cm height, while the specimen test of permeability and porosity test were a cylinder in10 cm diameter and 6.3 cm height. The compressive strength test was conducted in the age of 7, 14, 21, and 28 days, while porosity andpermeability test at 28 days of age concrete. The concrete porosity were tested with VIM (Void in Mix) method, Add permeability with fallingwater permeability test method which were also done in the age of 28 days. Replacement of gravel with the burned clay fraction aggregate hadincreased the porosity and the permeability coefficient of concrete. However this replacement decreased compressive strength. Pervious concretecompressive strength test results generated from the mixing of the aggregate fraction of burned clay waste 0%, 44.6%, 50.9%, and 100% were5,662 MPa; 5,473 MPa; 3,963 MPa; 2,925 Mpa respectively. Pervious concrete porosity test resulted that the average porosity of sample were29.048%, 30.33%, 31.941%, 39.317% for 0%, 44.6%, 50.9%, and 100% of burned clay aggregrat respectively . While their, permeabilityspecimens contained cement as a binding substance were 0758 cm/sec, 0.1203 cm/sec, 0.1343 cm /sec; 0.2487 cm/sec and without cementwere 18.4798 cm/sec; 21.0162 cm/sec; 21.7312 cm/sec; 25.9522 cm/sec. Those data showed that the greater concrete porosity, the greatercoeficienzy permeability consequenty the compressive strength decreased.
PENGARUH UKURAN BUTIRAN AGREGAT TERHADAP KUAT TEKAN DAN MODULUS ELASTISITAS BETON KINERJA TINGGI GRADE 80 Purwati, Agus; As'ad, Sholihin; Sunarmasto, Sunarmasto
Matriks Teknik Sipil Vol 2, No 2 (2014): Juni 2014
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mateksi.v2i2.37436

Abstract

The use of reactive materials with finer grains, like mikrosilica (silica fume) and superplasticizer enables to produce a more dense concrete with lowwater-cement ratio. Extra dense concrete improves the concrete compressive strength. One way to increase the concrete compressive strength withextra dense concrete manufacture is applying micro-sized particle filler. In addition, aggregate gradation plays an important role in determining thequality of the high performance concrete is grade 80. If the aggregates are finer and their grain are vary, the pore volume of concrete will be less.This is due the tiny grains that fill the pores between the larger grains. Less pore in concrete that leads to form more compact concrete. This studyaims to acces the compressive strength and modulus of elasticity of high performance concrete by varying the size of the aggregates. The study used anexperimental method with a total of 18 samples, there were 3 variations of each sample. Specimens used by cylinder in diameter 7.62 cm and15.24 cm in height. The compressive strength and modulus of elasticity of concrete were tested at the 28 days of concrete age. Compressive strengthof concrete with a larger grain size has a value lower compressive strength than concrete with a small grain size. Concrete made of aggregate size 19mm has the lowest compressive strength recorded 42.66 MPa and its modulus of elasticity was 16366.887 MPa and concrete made of aggregatesize 0.85 mm has the higest compressive strength recorded 84.7 MPa and its modulus of elasticity was 24870.674 MPa. Good aggregategradation will be able to result in maximum density and minimum porosity. This generates higher compressive strength in concrete.
Co-Authors Abdul Majid Achmad Basuki Hermawan, Ridwan Musyaffa, Dwi Nuur Niken Silmi Surjandari Nurul Azizah, Fadhliyah Puji Astutik, Herna Purwati, Agus Silmi Surjandari, Niken Sunarmasto, Sunarmasto Wibowo Wibowo