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Model Cabut-Serat Nylon 600 Tertanam Dalam Matriks Sementitis Berbasis Fraktur Susilorini, Retno
Jurnal Semesta Teknika Vol 11, No 1 (2008): MEI 2008
Publisher : Jurnal Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

The fracture mechanics is known as a fracture based approach to prohibit a catastrophic failure of structure. In micro scale field, the fracture mechanics is implemented especially to determine the performance of interface between fiber and cementitious matrix in âfiber-reinforced cementitious compositeâ. The studies and applications of nylon clearly define the advance characteristic of nylon may influence the overall performance of composites and become a crucial issue to be learned, therefore, this paper forwards a fractured based pull-out model of short nylon 600 embedded in cementitious matrix with main concern on fracture phenomenon. The research applies experiment that applies pull-out test with embedded nylon 600 in cementitious matrixand the analytical method that constructs the fractured based pull-out model. The experiment results show the specimens with pull-out fibers have embedded length lf = 30-60 mm and the broken fibers lf = 70-100 mm. The pull-out test also shows several stages: (a) Pre-slip stage, (b) Slip stage, and (c) Strain-hardening stage. The model fits to experimental results. Several theories meet conclusions: (a) Whenever fracture takes place, it is always an unstable crack, (b) Stable cracks are established by the presence of crack arrester, (c) There is no way directly to determine the length of stable crack, but it still can be determined by fractured based approach, (d) The length of stable crack is determined by the position of crack arrester, (e) There is an equation derived for pull-out model (f) There is an equation to determine the stable crack length, (g) Stable cracks may be used to determined the bond capacity, (h) After the establishment of stable cracks, increasing strain beyondÂ strain e1 will not increase stress s1, hence do not induce additional fracture, (i) Increasing of strain e after the establishment of stable cracks will increase stress s, then the second slip will not take place, (j) Broken nylon fibers have a longer embedded length because of the possibility of crack arrester presence is bigger than the shorter ones.

Adaptasi Pendampingan Pengelolaan Sampah di Masa Pandemi Covid-19 melalui Web Training Kreatifitas Produk Olahan Sampah Ismail, Amrizarois; Susilorini, Mi Retno; Wardhani, Dhiyan Krishna; Angghita, Lintang Jata
Jurnal Abdidas Vol. 1 No. 3 (2020): Vol 1 No 3 July Pages 88-182
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/abdidas.v1i3.38

Dalam masa pandemi COVID-19 ini, persolan pengelolaan sampah semakin besar. Pembatasan Kegiatan Masyarakat (PKM) di Kota Semarang mengakibatkan berkurangnya aktivitas masyarakat di luar rumah yang juga turut mendorong meningkatnya produksi sampah di dalam rumah tangga. Ketika pembatasan sosial diberlakukan, pelatihan dan seminar menjadi hal yang sulit untuk dilaksanakan. Berangkat dari hal tersebut, diperlukan alternatif metode baru dalam berkegiatan. Metode yang digunakan dalam kegiatan pengabdian masyarakat ini adalah metode demonstrasi. Sedangkan dalam analisis hasil kegiatan, metode yang digunakan adalah metode kualitatif eksperimental. Kegiatan web training kreatifitas hasil olahan sampah yang dilakukan RIL UNIKA Soegijapranata Semarang bekerja sama dengan Bank Sampah Bina Karya Sejahtera merupakan bentuk adaptasi kegiatan yang mampu menjadi alternatif bagi bank sampah untuk tetap menjalankan kegiatan peningkatan kapasitas SDM di masa pandemi COVID-19. Hal tersebut ditunjukan dengan adanya respon positif dari mayoritas peserta web training yang menunjukan efektifitas web training dan kegiatan yang berbasis digital lainya

PENGEMBANGAN INSTRUMEN PENINGKATAN KAPASITAS PEREMPUAN BERBASIS CHEKLIST DALAM UPAYA PENANGGULANGAN BENCANA PANDEMI COVID-19 Ismail, Amrizarois; Wardhani, Dhiyan Krishna; Angghita, Lintang Jata; Susilorini, Rr. M.I. Retno
KRITIS Vol 30 No 1 (2021)
Publisher : Universitas Kristen Satya Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/kritis.v30i1p21-34

Bencana dipahami sebagai peristiwa disebabkan oleh alam atau manusia yang membahayakan kehidupan dan penghidupan seseorang. Merujuk pada akibat yang ditimbulkan, seharusnya padangan mengenai bencana dapat diperluas menjadi segala faktor yang dapat menimbulkan akibat kerugian harta dan jiwa sebagaimana dijelaskan. Sehingga, kita dapat melihat faktor lain baik fisik maupun non fisik sebagai potensi bencana. Salah satu contohnya adalah bencana kesehatan akibat adanya polutan biotik (Bakteri, Jamur, Virus, dll), dalam hal ini pandemi COVIS-19. Bencana sendiri memiliki dampak yang berbeda antara perempuan dan laki-laki yang disebabkan oleh peran dan tanggungjawab yang berbeda. Tidak adanya bekal pengetahuan dan keterampilan dasar mengenai kesiapsiagaan bencana alam dan kesehatan menjadi salah satu penyebab keterbatasan perempuan dalam upaya menyelamatkan diri dan keluarga dalam situasi bencana dan wabah. Solusinya yaitu penguatan kapasitas untuk manajemen resiko bencana dan wabah penyakit pada perempuan perlu dilakukan. Produk dari penelitian ini adalah pengembangan instrumen yang berupa modul informasi pengetahuan dasar COVID-19 beserta tabel cecklist wabah Pandemi COVID-19 yang berfungsi sebagai alat bantu dan panduan mitigasi Wabah COVID-19 dalam keluarga. Instrumen ini merupakan salah satu langkah pembangunan sumber daya manusia (Human Resourch) khususnya pada bidang ketahanan terhadap bencana dan wabah penyakit.

OPTIMASI SERABUT KELAPA TERHADAP PENINGKATAN KINERJA BETON SERAT RR. M.I. Retno Susilorini; Andri Priyo Indartos Susilo Wardoyo
JURNAL LITBANG PROVINSI JAWA TENGAH Vol 1 No 2 (2003): Jurnal Litbang Provinsi Jawa Tengah
Publisher : Badan Perencanaan Pembangunan, Penelitian dan Pengembangan Daerah Provinsi Jawa Tengah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36762/jurnaljateng.v1i2.31

Indonesia faces a very deep complicated multi crisis. It has influenced the role of construction field development in this country. The concrete technology field, as the major material engineering field, must create a breakhtrough to cover the limited construction material that is cost higher and higher in every minutes. The innovation of concrete material, especially in fiber concrete, has developed by many researchers. Improving of local materials for fiber concrete, the materials of coconut fiber (coir) could be expected to become entrance gate to reach better future of public materials. The research conducted some experimental tests, with some concrete (mixed to coconut-fiber) cylinders specimens tested by splitting-tensile test. The volume of coconut fiber in concreteis 0.25%, the length of conconut-fiber vary with 40 mm, 60 mm, 80 mm, and 100 mm. Splitting-tensile test of specimens has performed good splitting-tensile stress of concrete. The research concluded : (1) The optimum value of split• ting-tensile stress of coconut-fiber concrete has reached by volume of25% variety with length 80 mm, (2) The coconut-fiber has given advantage in increasing the concrete performance that is avoiding the microcrack and giving a better splitting-tensile strength compared to normal concrete, (3) The performance of splitting-tensile stress of coconut fiber concrete increased by 13.62% compared to normal concrete

THE PERFORMANCE OF EARLY-AGE CONCRETE WITH SEAWATER CURING M.I Retno Susilorini; Kristina Retno Dewi W; Tri Wibowo
JOURNAL OF COASTAL DEVELOPMENT Vol 8, No 2 (2005): Volume 8, Number 2, Year 2005
Publisher : JOURNAL OF COASTAL DEVELOPMENT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (198.626 KB)

It is well known that concrete has been implemented for marine structures. Marine environment causes physical and chemical deterioration of concrete structures, thus, there is no doubt that the durability takes an important role in concrete performance. Learning about the performance of early-age concrete is to study the maturity of concrete, which is a key of concrete durability where “Maturity Concept” attempts to predict the development of concrete properties as a function of time and temperature of curing and becomes an excellent indicator of in-place strength development and quality from fresh to hardened concrete. It is a hypothesis for this research that the compressive strength of early-age concrete cured by seawater is higher than the one cured by plain water. This research was conducted by using two methods, experimental method and analytical method. The experimental method investigated the compressive strength of concrete cylinders, with 7 days and 14 days seawater curing and plain water curing. Concrete compressive strength design, f’c, is 22.5 MPa, and varies with water-cement ratio: 0.4, 0.5, and 0.6. After 7 days and 14 days of curing, the concrete cylinders were tested by compressive testing machine. The experimental results of this research showed that the compressive strength of 7 days and 14 days concrete specimens with seawater curing is higher than those cured by plain-water, about 2.56-5.25% for 7 days old specimens and 3.39-11.87% for 14 days old specimens. The result also showed that the lower water-cement ratio, the higher concrete compressive strength would be. The analytical calculation also gave higher compressive strength to specimens cured by seawater, about 0.06-0.39% for 7 days old specimens and 0.11-0.33% for 14 days old specimens. The higher strength compressive of concrete specimens with seawater curing is provided by the existence of calcium chloride in seawater and by high temperature of seawater. The analytical result of the “Maturity Concept” has given a good performance in predicting the compressive strength of concrete very well veryfying the experimental results. The hypothesis of this research is proven, that both experimentally and analytically, the compressive strength of 7 days and 14 days old concrete specimens cured by seawater are higher than those cured by plain water.

Model Cabut-Serat Nylon 600 Tertanam Dalam Matriks Sementitis Berbasis Fraktur Retno Susilorini
Semesta Teknika Vol 11, No 1 (2008): MEI 2008
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v11i1.774

The fracture mechanics is known as a fracture based approach to prohibit a catastrophic failure of structure. In micro scale field, the fracture mechanics is implemented especially to determine the performance of interface between fiber and cementitious matrix in ‘fiber-reinforced cementitious composite’. The studies and applications of nylon clearly define the advance characteristic of nylon may influence the overall performance of composites and become a crucial issue to be learned, therefore, this paper forwards a fractured based pull-out model of short nylon 600 embedded in cementitious matrix with main concern on fracture phenomenon. The research applies experiment that applies pull-out test with embedded nylon 600 in cementitious matrixand the analytical method that constructs the fractured based pull-out model. The experiment results show the specimens with pull-out fibers have embedded length lf = 30-60 mm and the broken fibers lf = 70-100 mm. The pull-out test also shows several stages: (a) Pre-slip stage, (b) Slip stage, and (c) Strain-hardening stage. The model fits to experimental results. Several theories meet conclusions: (a) Whenever fracture takes place, it is always an unstable crack, (b) Stable cracks are established by the presence of crack arrester, (c) There is no way directly to determine the length of stable crack, but it still can be determined by fractured based approach, (d) The length of stable crack is determined by the position of crack arrester, (e) There is an equation derived for pull-out model (f) There is an equation to determine the stable crack length, (g) Stable cracks may be used to determined the bond capacity, (h) After the establishment of stable cracks, increasing strain beyond strain e1 will not increase stress s1, hence do not induce additional fracture, (i) Increasing of strain e after the establishment of stable cracks will increase stress s, then the second slip will not take place, (j) Broken nylon fibers have a longer embedded length because of the possibility of crack arrester presence is bigger than the shorter ones.

Mechanical Properties of Concrete with Various Water-Cement Ratio After High Temperature Exposure M.I Retno Susilorini; Budi Eko Afrianto; Ary Suryo Wibowo
Jurnal Teknik Sipil Vol 2 No 2 (2006): Jurnal Teknik Sipil
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jts.v2i2.1262

Concrete building safety of fire is better than other building materials such as wood, plastic, and steel,because it is incombustible and emitting no toxic fumes during high temperature exposure. However,the deterioration of concrete because of high temperature exposure will reduce the concrete strength.Mechanical properties such as compressive strength and modulus of elasticity are absolutely corruptedduring and after the heating process. This paper aims to investigate mechanical properties of concrete(especially compressive strength and modulus of elasticity) with various water-cement ratio afterconcrete suffered by high temperature exposure of 500oC.This research conducted experimental method and analytical method. The experimental methodproduced concrete specimens with specifications: (1) specimen’s dimension is 150 mm x 300 mmconcrete cylinder; (2) compressive strength design, f’c = 22.5 MPa; (3) water-cement ratio variation =0.4, 0.5, and 0.6. All specimens are cured in water for 28 days. Some specimens were heated for 1hour with high temperature of 500oC in huge furnace, and the others that become specimen-controlwere unheated. All specimens, heated and unheated, were evaluated by compressive test.Experimental data was analyzed to get compressive strength and modulus of elasticity values. Theanalytical method aims to calculate modulus of elasticity of concrete from some codes and to verifythe experimental results. The modulus elasticity of concrete is calculated by 3 expressions: (1) SNI03-2847-1992 (which is the same as ACI 318-99 section 8.5.1), (2) ACI 318-95 section 8.5.1, and (3)CEB-FIP Model Code 1990 Section 2.1.4.2.The experimental and analytical results found that: (1) The unheated specimens with water-cementratio of 0.4 have the greatest value of compressive strength, while the unheated specimens with watercementratio of 0.5 gets the greatest value of modulus of elasticity. The greatest value of compressivestrength of heated specimens provided by specimens with water-cement ratio of 0.5, while the heatedspecimens with water-cement ratio of 0.4 gets the greatest value of modulus of elasticity, (2) Allheated specimens lose their strength at high temperature of 500oC, (3) The analytical result shows thatmodulus of elasticity calculated by expression III has greater values compares to expression I and II,but there is only little difference value among those expressions, and (4)The variation of water-cementratio of 0.5 becomes the optimum value.

Mode I Non-Linear Fracture Model: Cases on Concrete and Fiber Reinforced Concrete M.I Retno Susilorini
Jurnal Teknik Sipil Vol 4 No 2 (2008): Jurnal Teknik Sipil
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jts.v4i2.1305

Model fraktur ragam I non-linier telah banyak digunakan untuk memperoleh faktor intensitastegangan KSIc dan perpindahan bukaan ujung retak CTODc sebagai kriteria fraktur untuk beton danbeton serat. Beberapa model fraktur ragam I non-linier terdahulu antara lain Model Retak Fiktif olehHillerborg, (1976), Model Pita Retak oleh Bazant (1983, 1986), Model Dua-Parameter oleh Jenq danShah (1986), Model Penjalaran Retak Mode I oleh Zhang dan Li (2005), dan Model Kerusakan Non-Lokal oleh Ferrara dan Prisco (2005). Tulisan ini mengimplementasikan model fraktur ragam I nonlinierpada 2 kasus. Kasus pertama diimplementasikan pad beton sedangkan kasus keduadiimplementasikan pada beton serat. Kedua kasus tersebut akan memperoleh nilai faktor intensitastegangan KSIc dan perpindahan bukaan ujung retak CTODc. Kasus 1 adalah kasus benda uji balokbeton bertakik model fraktur ragam I non-linier dan kasus 2 adalah beton serat tak hingga modelfraktur ragam I non-linier. Kasus 1 menghasilkan nilai faktor intensitas tegangan KSIc sebesar 15.078MPa mm-1/2 dan perpindahan bukaan ujung retak CTODc sebesar 0.023 mm. Kasus 1 menghasilkannilai faktor intensitas tegangan KSIc sebesar 3.917.10-4 MPa mm-1/2 dan perpindahan bukaan ujung retak CTODc sebesar –1.994.10-4 mm. Secara umum, keberadaan serat sangat mempengaruhi solusianalitis. Tulisan ini memperoleh kesimpulan sebagai berikut: (1) Model fraktur ragam I non-linierdapat digunakan untuk memperoleh faktor intensitas tegangan KSIc dan perpindahan bukaan ujungretak CTODc sebagai kriteria fraktur untuk beton dan beton serat, (2) Perilaku fraktur beton seratadalah spesifik dibandingkan beton karena adanya fenomena penjembatanan serat, (3) Dalamperhitungan hasil faktor intensitas tegangan KSIc dan perpindahan bukaan ujung retak CTODc akanberlebihan bila traksi serat diabaikan dan kurang bila Zona Proses Fraktur diabaikan, (4) Akan sangatbaik bila mengkombinasikan Kasus 1 dan Kasus 2 bersama-sama untuk memperoleh nilai faktorintensitas tegangan KSIc dan perpindahan bukaan ujung retak CTODc dengan memperhatikankeberadaan serat dalam komposit matriks berserat.

LITERASI REVIEW SISTEM DRAINASE PERMUKAAN UNIVERSITAS PANCASAKTI TEGAL Soebyakto, Soebyakto; Yusuf, Muh.; Santoso, Teguh Haris; Salsabilla, Nadya Shafira; Hermawan, Okky Hendra; Susilorini, Retno
EJOIN : Jurnal Pengabdian Masyarakat Vol. 2 No. 2 (2024): EJOIN : Jurnal Pengabdian Masyarakat, Februari 2024
Publisher : LPPM Institut Pendidikan Nusantara Global

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/ejoin.v2i2.2379

Surface drainage is the regular diversion or disposal of excess water from the land surface through improved natural channels or constructed water channels, if necessary, equipped with the formation and assessment of the land surface for these channels. Campus 1 of Pancasakti University Tegal is located in the coastal area of Tegal City. In some cases, the land surface of Pancasakti Tegal University is shaped or graded to create a slope towards the channel. The different types of surface drainage systems are open channels, humps and depressions, embankments, and building edge drains. Drainage is the natural or artificial removal of surface and subsurface water from an area that has excess water. Internal drainage on most educational sites can prevent severe waterlogging, but many soils require artificial drainage to improve management of excess water. The first step in installing a drainage system is to survey the area and determine the type of system needed. During high tides and high rainfall, water intrusion occurs into the grounds of Pancasakti University Tegal. This involves assessing the amount of rainfall and sea tides in waterlogged areas, the slope of the land, and the type of soil. This will tell us what type and material of drainage system is best for the structure. The drainage problem that often arises is the lack of coordination and synchronization with other infrastructure development. In general, the handling of the drainage system is still partial, so it does not solve the problem of flooding and inundation completely. The purpose of this paper is to review several factors that cause water intrusion in drainage due to high tides causing water flow to be obstructed so that when it rains, water overflows and puddles occur.

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