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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.

PENGARUH PENAMBAHAN FLY ASH DAN KONDISI ADUKAN TANAH LIAT TERHADAP KUAT TEKAN BATA MERAH Nelly Astriani; Elhusna Elhusna; Ade Sri Wahyuni
Inersia: Jurnal Teknik Sipil Vol 9, No 2 (2017)
Publisher : Universitas Bengkulu

This article describes the research result of the effect of adding fly ash and water concentration of clay on red bricks’ compressive strength. Fisis characteristic and bricks’ compressive strength is according to SNI 15-2094-2000. Variation of fly ash that were used were 5%, 10%, 15%, 20%, 25%, and 30% from the weight of clay. Adding water concentration was based on three criterions of mortar clay condition, namely hard, normal, and soft. Hardmortar clayis a condition of the clay mixture which used less water than the normal mixture. Normal mixture is a condition ofthe clay mixture which usedwater based on usual concentration in brick factory. Soft mixture is a condition ofthe clay mixture that used much water than normal mixture. In this research, there are 8 sample for normal bricks and there are 144 sample for variation bricks. The optimum value of compressive strength for hard and normal mixture of variation bricks were obtained in 10% of fly ash variation which increased 33,59%, and 2,82% from normal bricks. Compressive strength for soft mixture of bricks was obtained in 5% of fly ash variation which increased 28,25% from normal bricks.

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).

PENGARUH PENAMBAHAN FLY ASH (ABU TERBANG) DAN ABU SEKAM PADI TERHADAP KUAT TEKAN BATA MERAH PEJAL KONVENSIONAL Bimo Prakoso; Elhusna Elhusna; Ade Sri Wahyuni
Inersia: Jurnal Teknik Sipil Vol 10, No 1 (2018)
Publisher : Universitas Bengkulu

Red brick is a building element used in the construction of buildings and made of clay plus water with or without material mixture of other materials. Fly ash and rice husk ash contain silica. Silica is a material that has the nature of pozzolan which can increase the compressive strength of the brick when mixed with the soil. This study aims to determine the effect of the addition of fly ash and rice husk ash (ASP) to the value of compressive strength of clay brick. The process of making the test specimen follows the procedure in the brick factory.Variations of specimens made were normal bricks and bricks with the addition of fly ashand rice husk ash (ASP) used were 5%, 10%, 15%, 20%, 25% and 30% to the weight of clay.The number of test specimens of each percentage of fly ash and rice husk ash (ASP) as much as 12 specimens. The method of testing of red brick strength is referred to SNI 15-20942000. The result of the research shows that the compressive strength of the clay brick has decreased from normal clay brick by 38,97 kg/cm². The biggest decrease in compressive strength value obtaines at clay brick with 30% ashes (48,04%) and the smallest decreased obtaines at clay brick compressive strength in clay brick with 5% ash (5,98%). The decrease of the compressive strength is influenced by the amount of ash addition, water quantity and moisture content.

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.

MORTAR SEMEN ABU DAUN PINUS DAN ABU BATA MERAH Elhusna Elhusna; Yuzuar Afrizal; Halimatus Sofia
Inersia: Jurnal Teknik Sipil Vol 11, No 1 (2019)
Publisher : Universitas Bengkulu

his article is a report research of mortar with 10% Pine leaf ash (PLA) and 5 variations of red brick ash (RBA). The mortar is a mixture of fine sand, water, and adhesive material with proportion of cement and fine sand is 1 dan 3. RBA was added up to 50% of cement with 10% addition for each variation. Both of the ashes were added base on the weight volume of cement of normal mortar. The normal mortar is the mortar without the ashes. The initial flow of themortar is 105%-115%. The 5 cm mortar cubes were made to test the compressive strength and the absorbtion. The tests were done according to SNI 03-6825-2002 and SNI 15-2049-2004 when the speciments age is 28 days. The cube speciments were taken out of the water sink a day earlier. The highest compressive strength is 22,4% higher than the normal mortar come out ofthe PLA mortar without RBA. The strength of the PLA and 10% RBA mortar is 4,4% higher than the normal one and 18% lower then the PLA mortar without the RBA. The lowest mortar absorbtion (11,68%) belongs to PLA mortar with 10% RBA. The research result shows that the absorbtion and the compressive strength of the mortar isnot always inversely propotional.

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.

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