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PENGARUH PENAMBAHAN PASIR SUNGAI PADA BATA MERAH TERHADAP KUAT TEKAN DAN PENYUSUTAN DI TALANG KERING KOTA BENGKULU Fitri Herlina; Elhusna Elhusna; Mukhlis Islam
Inersia: Jurnal Teknik Sipil Vol 7, No 1 (2015)
Publisher : Universitas Bengkulu

This report is the result of the research of the effect of river sand addition to red brick to the shrinkage and the compressive strength of the red brick. The production ofred bricks was done in brick factory in Talang Kering Kota Bengkulu. River sand derived from Taba Penanjung. The composition of the sand used was 0%, 5%, 10%, 15%, 20%, 25%, 30% of the weight of clay with the mold size of 10,5 cm x 21cm x 5 cm. The sample used for shrinkage sample is also used for compressive strength test as many as 140 pieces.Compressive strengthtesting refers to the SNI 03-4164-1996 and use compression tool hand operated machine with a capacity of 250kN. Compressive strength testing performed after the red brick with capping is7 days old. Mortar is made with a ratio of 1: 3 using the mount sandto produce mortar with compressive strength of 3,18 MPa. The results showed thatthe brick color is dominant yelloworange with lack of smooth surface and sharp edge. Depreciation smallest volume and weight of each of the addition of 30% amounting to 34,2% and 28,87%. Depreciation largest volume and weight of each of the addition of 15% sand by 39,7% and amounted to 32,96% without sand.Most powerful press red brick on the addition of 5% sand by 1,72MPa and the smallest on the addition of 30% sand at 1,24MPa. The resulting maximum compressive strength less than 2,5MPa so it does not meet the SII-0021-978.

PENINGKATAN KUAT TARIK BETON AKIBAT PENAMBAHAN SERAT SABUT KELAPA Elhusna Elhusna; Jefri Suwandi
Inersia: Jurnal Teknik Sipil Vol 4, No 1 (2012)
Publisher : Universitas Bengkulu

Five variations of fibre coconut were used to find out the ability of the fibre to enhance the concrete tensile strength. The coconut fibre (1%, 2%, 3%, 4% and 5% of the volume of the specimen) was added during mixing the concrete. the mix design of the concrete was done at 0,5 water cement ratio and 30-60 mm of slump value. SNI 03-2493-2002 was the standar that used for casting and curing the silinder (diameter/height;150/300 mm) while the split cylinder test was done according to SNI 03-2491-2002. The results showed that the addition of coconut fibre was significantly enhance the tensile strength of the fibre concrete. The correlation between the fibre and the tensile strength was given in quadratic equation which the correlation coeficient ( R2 ) was 0,982. The addition of 5% of the fibre enhanced the tensile strength up to 64,66% of the fibre concrete compared to the concrete without the fibre.

PENGARUH PENAMBAHAN ABU SEKAM PADI (ASP) TERHADAP KUAT TEKAN DAN ABSORPSI BATA MERAH Rudi Hartono; Elhusna Elhusna; Fepy Supriani
Inersia: Jurnal Teknik Sipil Vol 7, No 1 (2015)
Publisher : Universitas Bengkulu

Penelitian ini bertujuan mengetahui besarnya pengaruh penambahan abu sekam padi (ASP) terhadap sifat mekanis bata merah (kuat tekan dan absorpsi) dan persentase penambahan ASP yang terbaik untuk campuran bata merah. Metode penelitian yang digunakan berupa eksperimen dengan menambahkan ASP sebagai bahan campuran pembuatan bata merah. Variasi sampel bata merah yang dibuat yaitu bata normal (R0) dan bata merah dengan penambahan ASP (5%, 10%, 15%, 20% dan 25%). Jumlah sampel benda uji untuk masing-masing persentase penambahan ASP adalah sebanyak 20 buah bata merah. Berdasarkan penelitian yang dilakukan kuat tekan tertinggi terdapat pada sampel bata R0 (3,164 MPa), sedangkan kuat tekan terendah terdapat pada bata merah dengan persentase penambahan ASP 25% (1,030 MPa). Nilai absorpsi terbesar terdapat pada bata merah dengan penambahan ASP 25% (28,2%) dan yang terendah terdapat pada bata merah normal (23,1%). Berdasarkan hasil pengujian kuat tekan dan absorpsi bata merah dapat disimpulkan bahwa penambahan ASP dapat menurunkan nilai kuat tekan bata merah dan menaikan persentase absorpsi. Nilai kuat tekan berbanding terbalik dengan absorpsi bata merah.

ANALISIS PENAMPANG KOLOM BETON BERTULANG PERSEGI PANJANG BERLUBANG Marzon Marzon; Mukhlis Islam; Elhusna Elhusna
Inersia: Jurnal Teknik Sipil Vol 10, No 2 (2018)
Publisher : Universitas Bengkulu

Installation of pipes (conduit) in the building columns often found in reinforced concrete structures. The installation of pipes inside the columns is utilized as sanitary and mechanical electrical pipes. The case research in this study is to analyze the rectangular column with the applied research type (applied/pratical research). This research aims to analyze the impact of the holes on square rectangular columns. This calculation consists of 675 samples with differentconcrete compression strength (f'c), reinforcement area, holes area, and the dimensions of the column. Analysis of the calculation of hollow rectangular columns using the stress-strain relationship equation developed by Hognestaad. The results of the analysis on hollow rectangular columns resulted in a decrease column capacity. The largest decrease of the rectangular column capacity occurred on holes area of 7%, with concrete compression strength 30 MPa, and dimensions of the column 450 x 1800 mm which is 16.97%.

HUBUNGAN BERAT ISI DAN KUAT TARIK BETON SERAT BAMBU DENGAN ABU CANGKANG LOKAN DAN ABU SEKAM PADI Elhusna Elhusna; Agustin Gunawan; Reizki Darmawan
Inersia: Jurnal Teknik Sipil Vol 5, No 2 (2013)
Publisher : Universitas Bengkulu

Concrete which has significant weight is good at compressive strength and poor at tensile strength. This study aimed to find out the relationship between the tensile strength and density of bamboo fiber concrete which 40 % of the fine aggregate was replaced with the sea shell ash (ACL) and the rice husk ash (ASP). The bamboo fiber variations which used, 0,25 % (V1) dan 0,50 % (V2) were calculated from the cement weight. Each fiber bamboo variations has 3samples of ACL and ASP weight ratio e.g 35:65 (C1), 50:50 (C2), 65:35 (C3). 3 concrete cylinders of diameter 15 cm and height 30 cm were made for each samples. All the specimens were compared to the normal concrete of water cement ratio 0,45 and slump value 6-10 cm.The specimens were made and maintained by SK SNI T-15-1990-03 and SNI 03-2493-1991. The tensile strength of the specimens were tested at the age of 28 days according to SNI 03-24912002. The highest tensile strength was belonged to V2C2. The significance density (2.347,57 kg/m3) belong to the normal concrete. The highest of the density and the tensile strength of eachvariation of ACL and ASP were occurred at the bamboo fiber concrete 0,5 % (V2).

KUAT TEKAN BATA MERAH DENGAN VARIASI USIA DAN KADAR AIR ADUKAN TANAH LIAT Elhusna Elhusna; Rina Agustin
Inersia: Jurnal Teknik Sipil Vol 8, No 2 (2016)
Publisher : Universitas Bengkulu

Clay mortar storage during the molding of brick often takes place in brick home industry factories. The storage caused by the time and the labors limitation. This article is the report of the research of the age of the clay mortar storage during the process of the brick. Clay mortar in this research was made at the same time and molded to be 20 bricks every day till the fith day of the clay mortarstorage. Water content of each clay mortar variations were measured. The brick production process were done as the way they did at a factory in Pasar Pedati, Midle Bengkulu Regency. The brick compressive strength test was done according to SNI 03-4164-1996 using the compression machine hand operated of 250 kN capacity. The test was done on the seventh day after the mortar covering on top and bottom of the brick. Every first crack was occurred at the brick. The strength which report is the strength of the brick when the first crack occur during the test. The two days clay mortar storage produce best compressive strength of the brick. It also has the highest clay mortar water content. The clay mortar storage of 2 untill 4 days produce bricks with better strength.

PERILAKU KUAT TEKAN BETON DENGAN ABU CANGKANG SAWIT SEBAGAI PENGGANTI SEBAGIAN SEMEN Martin Lerry; Elhusna Elhusna; Yuzuar Afrizal
Inersia: Jurnal Teknik Sipil Vol 4, No 2 (2012)
Publisher : Universitas Bengkulu

The aim of this research was to know if palm oil (Elaeis Guineensis) fly ash could replace some cement. Palm oil fly ash which used was taken from palm oil factory PT.Sandabi Indah Lestari at North Bengkulu. The research was directed according to SK SNI-T-15-1990-03, used cylinder specimens, water cement ratio 0.5, and slump value 30-60 mm. The research was substituted partly cement with palm oil fly ash as 0%, 5%, 10%, 15%, and 20% of cement weight. There were two types of sand used in the research namely oceanic sand and mountain sand. All the samples had the same caring until 28 days when the compression test carried out. Concrete compression strength showed decreasing trend. The strength decreased as theincreasing of percent of palm oil fly ash used. The maximum decreases compared to the strength of concrete without the ash were 40% when the concrete used mountain sand and 45,19% when it used oceanic sand.

PENGARUH VARIASI PERSENTASE ABU SEKAM PADI (ASP) DAN ABU CANGKANG LOKAN(ACL) SEBAGAI PENGGANTI SEBAGIAN AGREGAT HALUS DAN SEMEN TERHADAP KUAT TEKAN MORTAR (Kajian Terhadap Adukan Mortar 1Pc : 3Ps) Junita Eka Susanti; Ade Sri Wahyuni; Elhusna Elhusna
Inersia: Jurnal Teknik Sipil Vol 7, No 1 (2015)
Publisher : Universitas Bengkulu

The purpose of this research is to know the influence of sea shell ash (SSA) and rice husk ash (RHA) as partial replacement of cement and sand toward the strength of mortar. The mold with dimension 50 mm x 50 mm x 50 mm were used to cast the mortar.There are 16 variation made from different percentages of RHA and SSA used.The range initial flow used was 80-100%. The result shows that the normal mortar has the highest strength of all. The decrease of mortar strength with RHA and SSA was in the range of 11.60%-59.11% in comparison with normal mortar.

PENGARUH SERAT SABUT KELAPA TERHADAP KUAT LENTUR BETON DENGAN FAKTOR AIR SEMEN O,5 Elhusna Elhusna; Fepy Supriani; Agustin Gunawan; Mukhlis Islam
Inersia: Jurnal Teknik Sipil Vol 3, No 1 (2011)
Publisher : Universitas Bengkulu

18 slabs of 100x100x500 mm dimension had been tested to find out the influence of coconut fiber as the additive to the flexural strength of concrete. The water ratio of the concrete mix design was 0,5. The percentation of coconut fiber were 1%, 2%, 3%, 4% and 5% of the volume of the specimen. The result showed that the fiber additional to the concrete cause the strength getting higher as the percentation getting bigger. The flexural strength of 5% the fiber was 30% higher than the slab of the concrete without the fiber.

PERILAKU KUAT TEKAN MORTAR SEMEN PASANGAN DENGAN ABU SABUT CANGKANG SAWIT YANG DIOVEN DAN TIDAK DIOVEN Elhusna Elhusna; Agustin Gunawan; Dofi Hendro Fogi
Inersia: Jurnal Teknik Sipil Vol 5, No 1 (2013)
Publisher : Universitas Bengkulu

The order of mortar cement which used to bond individual units of masonry and to cover masonry wall keeps increasing. Meanwhile, the natural source of cement is limited. This article is the report of the research of the behaviour of mortar compression strength which used palm oil fibrous shell ash as the additive of cement. The ash used in this research was strained by strainer number 200. The ash discerned to the difference between the oven and unoven one. The proportions of cement and sand that used were 1:3 dan 1:5. The percentages of each of the ash were varied by the increment 2,5% between 0 to 10 %. 200 mortar 50 mm cubes distributed to each cell of samples were used according to ASTM C109/C109M-02. The concistency and the workability of the mortar was done by flow table test according to ASTM C-270. The mortar cubes were cured in water since the mall were gotten off. The compession test was held according to SNI 03-6825-2002 at 28 days of the cubes age. The results of analysis of variance (anova) of the mortar strength which used ovened ash were significant for the strength of the proportion 1:5 and unsignificant for the strength of 1:3 of the proportion. The strength of the significant one was inceased 0.66% at the mortar which used 10% ash. The results of the anova of the mortar strength with unovened ash were significant for the mortarproportion 1:3 and unsignificant for the strength of 1:5 mortar proportion. The strength of the significant one was 1,54% higher at mortar with 2,5% ash compared to the one without the ash.

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