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Uji Perbaikan Retakan Dinding Akibat Geser dengan Kawat Ayam Fauziah, Rizkya Imro?atul ; Karjanto, Adjib; Djatmika, Boedya
Prosiding SENTIKUIN (Seminar Nasional Teknologi Industri, Lingkungan dan Infrastruktur) Vol 1 (2018): PROSIDING SENTIKUIN
Publisher : Fakultas Teknik Universitas Tribhuwana Tunggadewi

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The wall is designed as a non-structural filler component but is used as a support load on it. When exposed to high earthquake vibrations, there will be diagonal cracks accompanied by a reduction in strength because Indonesia is a country that has the potential to cause earthquakes. There needs to be repairs and reinforcement on the damaged part, one of which is using a chicken wire reinforcement. This study used experimental descriptive with test specimens in the form of brick wall measuring 50 cm x 50 cm, thickness of 14 cm, and in the middle of plaster planted chicken wire. In the crack gap was given mortar. The result of study are (1) test of shear diagonal strength of brick wall without reinforcement of chicken wire obtained a mean value of 1,16 kg / cm2; (2) test of shear diagonal strength of brick wall with chicken wire strengthening obtained a mean value of 1,21 kg / cm2; (3) test of shear diagonal strength of brick wall repair with reinforced chicken wire obtained a mean value of 4.04 kg / cm2; and (4) there was significant different score at ? = 0,05 of brick wall without reinforcement, with reinforcement, and repair with chicken wire strengthening.  

Uji Kekuatan Dinding Batu Bata dengan Spesi yang Bervariasi Menerima Beban Tekan Terpusat Firmansyah, Revaldo; Karjanto, Adjib; Djatmika, Boedya
Prosiding SENTIKUIN (Seminar Nasional Teknologi Industri, Lingkungan dan Infrastruktur) Vol 1 (2018): PROSIDING SENTIKUIN
Publisher : Fakultas Teknik Universitas Tribhuwana Tunggadewi

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Generally, bricks are used as building structural wall materials and dwelling. This study aims to find out the strength of the brick wall pairs when receiving a lumped load of the roof structure of a mixture commonly used by the community is 1 PC: 8 Sand and 1 PC : 10 Sand so as to avoid cracks in the wall due to the roof structure load. This test used  local bricks from Tumpang Malang with Model M-6B 230 mm x 110 mm x 55 mm. Another materials obtained from the building store in Malang City. The testing method used is SNI 03-4166-1996 robust test procedure for compressing red brick. The test method used is SNI 03-4166-1996 about the test procedure of compressive strength of red brick masonry wall. The dimensions of specimens is 75 x 64 cm as much as 3 samples of each thickness variation, where the thickness variation is 3 cm, 4 cm, and 5 cm so that the number of sample objects test all 18 specimens. Further test object tested press using UTM according SNI 03-4166-1996. The result showed that the average compressive strength of brick masonry wall was 1 PC : 8 Sand on variation of thickness of 3 cm, 4 cm, 5 cm, respectively by 8.26 kg/cm2, 7.63 kg/cm2, 7.4 kg/cm2. The average compressive strength of brick masonry wall of 1 PC : 10 Sand on variation in thickness of 3 cm, 4 cm, 5 cm, respectively by 8.11 kg/cm2, 6.91 kg/cm2, 6.46 kg/cm2.

Perkuatan pada Balok Beton Berlubang di Daerah Tekan yang Mengalami Lenturan dengan Mortar Geoplimer Karjanto , Adjib; Djatmika, Boedya; Susanto, Prijono Bagus
Prosiding SENTIKUIN (Seminar Nasional Teknologi Industri, Lingkungan dan Infrastruktur) Vol 2 (2019): PROSIDING SENTIKUIN
Publisher : Fakultas Teknik Universitas Tribhuwana Tunggadewi

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In its development, changes in building functions often occur so as to require flexible bending of building functions, ways are needed to provide reinforcement or repairs to hollow beams. One method in strengthening or repairing hollow beams is the grouting method. Grouting using geopolymer material has the advantage of great strength and faster setting time. These geopolymer properties are very suitable for grouting methods that require fast setting times and small shrinkage. In this study the test uses a beam measuring 100 X 20 X 15 cm with 10 M NaOH molarity Comparison of the activator, as well as the location and number of holes, 2 points in the bending area to determine the flexural strength and condition of the concrete after reinforcement (grouting). Where in this study used 9 pieces of reinforced concrete beams (3 normal beams, 3 porous beams, 3 reinforced beams). Normal beams have an average bending capacity of 149.777 kg / cm2, while hollow beams have an average bending capacity of 118.36 kg / cm2, and repaired / grouting beams have an average bending capacity of 139.022 kg / cm2. There is a difference in the average flexural capacity in normal beams of 149.777 kg / cm2 in hollow beams of 118.36 kg / cm2, which has a difference of 31.41 kg / cm2 (20.97%). There is a difference in the average flexural capacity in the grouting beam of 139.022 kg / cm2 in the hollow beam of 118.36 kg / cm2, which has a difference of 20.66 kg / cm2 (14.86%). In a statistical analysis with a significance of 0.05 there was no significant difference in flexural strength in reinforced concrete grouting blocks 131.11 kg / cm2 against normal beams, 149.77 kg / cm2 had a difference of 10.755 kg / cm2 in a percentage of 7.19%.

KAJIAN PENAMBAHAN ABU BONGGOL JAGUNG YANG BERVARIASI DAN BAHAN TAMBAH SUPERPLASTICIZER TERHADAP SIFAT FISIK DAN MEKANIK BETON MEMADAT SENDIRI (SELF – COMPACTING CONCRETE) Nindi Fakhrunisa; Boedya Djatmika; Adjib Karjanto
BANGUNAN Vol 23, No 2 (2018): BANGUNAN EDISI OKTOBER
Publisher : Universitas Negeri Malang

Pembangunan di Indonesia seperti saat ini memunculkan keperluan pemakaian beton yang cukup besar dan cepat. Upaya penyelesaian masalah tersebut dengan membuat beton jenis self - compacting concrete. Beton SCC adalah beton yang memiliki nilai slump cukup tinggi sehingga mampu mengisi ruang-ruang sempit tanpa harus adanya pemadatan. Pembuatan beton SCC diperlukan superplasticizer atau bahan tambah lainnya. Dan pada penelitian ini beton SCC ditambahkan abu bonggol jagung dan dapat mengurangi pemakaian semen yang merupakan penyumbang polusi udara. Tujuan penelitian ini untuk mengetahui presentase unsur kimia abu bonggol jagung, mengetahui sifat fisik beton SCC, nilai kuat tekan dan modulus elastisitas beton SCC, komposisi campuran beton SCC pada kuat tekan rencana fc’ 30 MPa, perbedaan sifat fisik dan mekanik beton SCC dengan penambahan abu bonggol jagung yang bervariasi dan, dan kadar abu bonggol jagung optimum yang menghasilkan kinerja terbaik. Metode yang digunakan pada penelitian ini adalah metode eksperimental. Dengan variasi penambahan abu bonggol jagung 0 persen, 4 persen, 8 persen, 12 persen dan superplaticizer 0,8 persen. Benda uji yang digunakan Ø 7,5 cm x 15 cm sebanyak 60 benda uji dan Ø 15 cm x 30 cm sebanyak 8 benda uji. Pengujian beton SCC dilakukan dengan menguji sifat fisik berupa slump flow, berat volum, porositas, sedangkan sifat mekanik yaitu kuat tekan yang dilakukan pada umur 7, 14, dan 28 hari dan modulus elastisitas pada umur 28 hari. Hasil Penelitian didapatkan (1) Presentase kimia abu bonggol jagung yang dominan yaitu pada unsur kalium sebesar 81,2 persen, (2) Hasil pengujian sifat fisik beton SCC dengan penambahan abu bonggol jagung memenuhi persyaratan dari masing-masing pengujian, (3) Nilai kuat tertinggi umur 28 hari didapatkan pada kadar abu bonggol jagung 4 persen sebesar 36,25 MPa, dan nilai modulus elastisitas umur 28 hari didapatkan pada kadar abu bonggol jagung 4 persen sebesar 20.078,37 MPa, (4) Campuran beton SCC kadar 4 persen dan 8 persen umur 28 hari melebihi fc’ 30 MPa. (5) Uji hipotesis berat volume, porositas, dan kuat tekan tidak terdapat perbedaan yang signifikan, namun pada modulus elastisitas ada perbedaan secara signifikan dengan Sig kurang dari 0,05. (6) Kadar abu bonggol jagung yang menghasilkan kinerja terbaik adalah pada kadar 4 persen. Kata Kunci: abu bonggol jagung, beton SCC, sifat fisik, sifat mekanik

KAJIAN PENAMBAHAN PAPER SULDGE YANG BERVARIASI TERHADAP SIFAT FISIK DAN MEKANIK CEILING BRICK M. Abdul Aziz Kurniawan; Eko Suwarno; Boedya Djatmika
BANGUNAN Vol 25, No 1 (2020): BANGUNAN EDISI MARET
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um071v25i12020p41-52

Abstrak:Ceiling brick buangan paper sludge salah satu alternatif membuat pelat lantai, secara ekonomis lebih murah dan memiliki kuat tekan setara dengan beton konvensional K300. Penelitian ini menggunakan metode eksperimen. Terdapat dua jenis benda uji yang digunakan yaitu berbentuk kubus dengan ukuran 5 cm x 5 cm x 5 cm untuk mengetahui kualitas bahan ceiling brick dan benda uji berbentuk produk ceiling brick untuk mengetahui kualitas produk ceiling brick. Variasi paper sludge yang digunakan adalah 2, 4, 6, dan 8 persen. Satu benda uji dilakukan dua pengujian yaitu uji fisik (rembesan air) dan mekanik (kuat tekan). Metode penelitian menggunakan analisa statistik One Way dan dilanjutkan analisis Tukey. Hasil dari penelitian ini adalah (1) Kuat tekan produk ceiling brick dengan campuran paper sludge berurut-urut 0, 2, 4, 6, dan 8 persen sebesar 8.43 MPa, 9.39 MPa, 11.28 MPa, 10.31 MPa, dan 8.30 MPa. Nilai rata-rata rembesan air produk ceiling brick dengan variasi berurut-urut 0%,2%, 4%, 6%, dan 8%, yaitu sebesar 0.35 ml/menit, 0.37 ml/menit, 0.35 ml/menit, 0.42 ml/menit, dan 0.36 ml/ menit. (2) Kuat tekan mortar kubus ceiling brick dengan campuran paper sludge berurut-urut 0, 2, 4, 6, dan 8 persen sebesar 105.66 MPa, 112.67 MPa, 104.20 MPa, 98.55 MPa, dan 105.24 MPa. Rembesan air mortar kubus ceiling brick dengan variasi berurut-urut 0, 2, 4, 6, dan 8 persen, yaitu sebesar 0,59 ml/menit, 0,54 ml/menit, 0,46 ml/menit, 0,27 ml/menit, dan 0,28 ml/menit. (3) Uji kuat tekan dan rembesan air terhadap produk ceiling brick yang telah dicampur paper sludge mengalami perbedaan tetapi tidak signifikan. (4) Uji kuat tekan terhadap mortar kubus ceiling brick yang dicampur paper sludge mengalami perbedaan tetapi tidak signifikan. Sedangkan uji rembesan air tehadap mortar kubus ceiling brick yang dicampur paper sludge mengalami perbedaan yang signifikan. (5) Campuran paper sludge 4 persen pada produk ceiling brick dan campuran paper sludge 2 persen pada mortar kubus ceiling brick menghasilkan kuat tekan optimum.Kata-kata kunci: paper sludge, limbah kertas, ceiling brick, sifat fisik & mekanikAbstract: Paper sludge ceiling bricks are an alternative to making floor plates, are economically cheaper and have compressive strength equivalent to conventional K300 concrete. This research is using experimental method. There are two types of specimens used which are cube shaped with a size of 5 cm x 5 cm x 5 cm to determine the quality of ceiling brick material and specimens in the form of ceiling brick products to determine the quality of ceiling brick products. Paper sludge variations used are 0, 2, 4, 6, dan 8 percent. One test object was carried out two tests, namely physical test (water seepage) and mechanical (compressive strength). The research method uses One Way statistical analysis and Tukey analysis continues. The results of this study are (1) Compressive strength of brick brick products with a mixture of paper sludge in sequence of 0, 2, 4, 6, dan 8 percent at 8.43 MPa, 9.39 MPa, 11.28 MPa, 10.31 MPa and 8.30 MPa. The average seepage value of ceiling brick products with sequential variations of 0, 2, 4, 6, dan 8 percent which is 0.35 ml / minute, 0.37 ml / minute, 0.35 ml / minute, 0.42 ml / minute minutes, and 0.36 ml / minute. (2) Compressive strength of ceiling brick cube mortar with a mixture of paper sludge in a sequence of 0, 2, 4, 6, dan 8 percent by 105.66 MPa, 112.67 MPa, 104.20 MPa, 98.55 MPa and 105.24 MPa. Mortar cube ceiling water seepage with sequential variations of 0, 2, 4, 6, dan 8 percent in the amount of 0.59 ml / minute, 0.54 ml / minute, 0.46 ml / minute, 0.27 ml / minute, and 0.28 ml / minute. (3) The compressive strength and water seepage tests on ceiling brick products that have been mixed with paper sludge experience differences but are not significant. (4) Compressive strength test of ceiling brick cube mortar mixed with paper sludge is different but not significant. While the water seepage test of ceiling brick cube mortar mixed with paper sludge experienced a significant difference. (5) 4 percent paper sludge mixture in ceiling brick products and 2 percent paper sludge mixture in ceiling brick cube mortars produce optimum compressive strength.Keywords: paper sludge, waste paper, ceiling brick, physical & mechanical properties

Effect of the Use of Metakaolin Artificial Lightweight Aggregate on the Properties of Structural Lightweight Concrete Puput Risdanareni; Afif Achsanul Choiri; Boedya Djatmika; Poppy Puspitasari
Civil Engineering Dimension Vol. 19 No. 2 (2017): SEPTEMBER 2017
Publisher : Institute of Research and Community Outreach - Petra Christian University

This paper investigates the effect of using metakaolin Artificial Lightweight Aggregates (ALWA) as a substitute for coarse aggregates to produce structural lightweight concrete. A combination of 10M NaOH solution and sodium silicate solution was used as alkali activator. The ratio between the metakaolin binder and the alkali activator used in producing metakaolin ALWA is 48%:52%, by mass. It is shown that metakaolin ALWA has higher abrasion and water absorption, and lower bulk density values compared to normal aggregates. To determine the effect of using metakaolin ALWA as coarse aggregates in concrete, three variations of ALWA dosages were used, i.e. 0%, 50%, and 100% of the total coarse aggregates, by volume. The results show that the compressive strength of concrete decreased along with the increase of ALWA content in the mixture. However, concrete using 100% ALWA as coarse aggregates meets the requirements of compressive strength and density of structural light weight concrete.

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