scholarly journals Tinjauan Karakteristik Tanah untuk Stabilisasi Lapis Pondasi Perkerasan Jalan

2017 ◽  
Vol 5 (2) ◽  
pp. 94-108
Author(s):  
Bambang Raharmadi
Keyword(s):  
Mechanical Properties ◽  
Specific Gravity ◽  
Moisture Content ◽  
Soil Stabilization ◽  
Ground Surface ◽  
Physical And Mechanical Properties ◽  
Dry Weight ◽  
Optimum Moisture Content ◽  
National Standard ◽  
Soil Color

The procedure carried out is testing the physical and mechanical properties of the soil from the quari of Bukit Batu village and quari of Manyawang hamlet based on the Indonesian National Standard (SNI). The purpose of the preparation of this paper was to determine the physical and mechanical properties of the soil from the quari of Bukit Batu village and quari dusun Manyawang so that it could be used as cement stabilization material. Quari soil test results in Bukit Batu village as deep as 1.5 meters from the ground surface with yellow brown soil color, 14.34% moisture content, 2.637 specific gravity and Manyawang quari dusun 1.25 meters from the ground with brownish yellow soil color water 13.80%, specific gravity 2.635. The grain size distribution test fulfilled the conditions allowed to be used as soil stabilization material for cement with a plasticity index of 5.41%, 6.21% = 10% of the specified conditions (Hicks, 2002) and the soil classification of the USCS system included in the CL-ML group namely non-organic silt, sandy clay with low plasticity and AASHTO were included in group A-4 namely silt clay with low plasticity. Quari compacting test (standard) in the village of Bukit Batu filled the maximum dry (?dmax) of the soil 1,860 t / m3, optimum moisture content of 13,30% and Manyawang maximum dry weight (mdmax) of soil 1,860 t / m3, optimum moisture content of 13.30%. Free compressive strength test (UCS) quari in Bukit Batu and Manyawang villages 3,451 kg / cm2, 3,521 kg / cm2 and CBR quari test in Bukit Batu and Manyawang villages CBR 100 9.40%, 8.10% and CBR 95 5.20%, 4.65%.

scholarly journals SIFAT FISIK MEKANIK PAPAN PARTIKEL DARI AMPAS SAGU (Metroxylon sp) BERDASARKAN UKURAN PARTIKEL DAN PERBANDINGAN ASAM SITRAT-SUKROSA

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
. Wiwit ◽  
Dina Setyawati ◽  
Ahmad Yani ◽  
. Nurhaida
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Citric Acid ◽  
Moisture Content ◽  
Physical Properties ◽  
Physical And Mechanical Properties ◽  
Dry Weight ◽  
Natural Adhesive ◽  
Density Values

The manufacture of particleboards from dregs of sago and natural adhesives of citric-sucrose acid has not been widely reported. The aim of this research to examine the physical and mechanical properties of particleboard from dregs of sago based on particle size and the ratio of citric-sucrose. The dregs of sago used is 8-10 mesh and 20-40 mesh. Natural adhesive is used 20% of the dry weight dregs of sago. The ratio of citric acid-sucrose used varies 0/100, 25/75, 50/50, 75/25, 100/0. The particleboard is made manually consisting of 3 layers (face, core, back) were manufactured in 30 cm x 30 cm x 1 cm, and the target of density was 0,7 g/cm3. The pressing at a temperature of 180oC for 15 minutes, and pressure of 20 kg/cm2. The physical and mechanical  properties of particleboard were tested in accordance to standard JIS A 5908-2003 Type 8. The results showed particleboard that physical properties meets the standards is density, moisture content, and thickness development. The particleboard dregs of sago with ratio citric acid-sucrose 25/75 was able to provide the best results to meet the standards of JIS A 5908-2003 Type 8 for density values of 0,7532 g/cm3, moisture content of 8,6725%, thickness of  development 8,0756%.Keywords: citric acid-sucrose , dregs of sago, particleboard, particle size

scholarly journals Bamboo as future bio-industrial material: Physical behaviour and bending strength of Malaysia’s Beting bamboo (Gigantochloa levis)

2022 ◽  
Vol 951 (1) ◽  
pp. 012001
Author(s):  
S Osman ◽  
M Ahmad ◽  
M N Zakaria ◽  
A M Zakaria ◽  
Z Ibrahim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Specific Gravity ◽  
Moisture Content ◽  
Physical Properties ◽  
Dimensional Stability ◽  
Fiber Orientation ◽  
Bending Strength ◽  
Physical And Mechanical Properties ◽  
Timber Species ◽  
Industrial Material

Abstract In this paper, bending strength and physical properties (specific gravity, dimensional stability and equilibrium moisture content) of a Malaysian bamboo locally known as Beting bamboo (Gigantochloa levis) are addressed. Characterizations of physical and bending strength of G. levis in terms of the variability of location along culm height (top, middle, bottom), culm section (nodes and internodes), fiber orientation (longitudinal, tangential and radial) and culm layer (outer and inner) were conducted. Comparison of these properties is also made to some bamboo and commercial timber species. It was found that G. levis has favorable physical and mechanical properties although the specific gravity of G. levis has tendency to be on the higher side. The characteristics studied were found to have some variability at different locations, sections, and directions. There was variability in terms of bending strength along with the culm height of bamboo. It is indicated from this study that the bending strength and physical properties of G. levis were found to be satisfactory.

scholarly journals Sifat Kayu Lapis yang Dibuat dari Lima Jenis Kayu Asal Riau

2020 ◽  
Vol 25 (4) ◽  
pp. 657-663
Author(s):  
Achmad Supriadi ◽  
Deazy Rachmi Trisatya ◽  
Ignasia Maria Sulastiningsih
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Wood Species ◽  
Bonding Strength ◽  
Urea Formaldehyde ◽  
Physical And Mechanical Properties ◽  
Modulus Of Rupture ◽  
National Standard ◽  
Randomized Design ◽  
Completely Randomized Design

The objective of this study was to determine the physical and mechanical properties of plywood made of punak (Tetramerista glabra Miq.), meranti bunga (Shorea teysmanniana Dyer ex Brandis), mempisang (Alphonsea spp.), suntai (Palaqium burckii H.J.L.), and pasak linggo (Aglaia argentea Blume). Liquid urea formaldehyde (UF) was used as an adhesive. Data analysis was carried out using a completely randomized design. Results showed that the moisture content and density of plywood produced in this study were around 10.4-10.95% and 0.65 to 0.93 g/cm3, respectively. The modulus of elasticity (MOE) and modulus of rupture (MOR) of plywood produced were between 63.371-123.548 kg/cm2 and 517-1.052 kg/cm2, respectively. It was also found that the tensile strength and bonding strength of the plywood produced were 461.6-1.095 kg/cm2 and 18.97-31.79 kg/cm2, respectively. It was recorded that moisture content and the bonding strength of the plywood produced met the Indonesian National Standard of Plywood. Among others, plywood produced from pasak linggo showed a superior quality. Referring to statistical analysis, it was confirmed that physical and mechanical properties of plywood were significantly affected by wood species, except moisture content. Keywords: mechanical properties, physical properties, plywood, Riau wood species

scholarly journals ADSORPTION OF NANOWOLLASTONITE ON CELLULOSE SURFACE: EFFECTS ON PHYSICAL AND MECHANICAL PROPERTIES OF MEDIUM-DENSITY FIBERBOARD (MDF)

CERNE ◽  
2016 ◽  
Vol 22 (2) ◽  
pp. 215-222 ◽  
Author(s):  
Hamid Reza Taghiyari ◽  
Roya Majidi ◽  
Asghar Jahangiri
Keyword(s):  
Mechanical Properties ◽  
Density Functional ◽  
Medium Density Fiberboard ◽  
Physical And Mechanical Properties ◽  
Mechanical Tests ◽  
National Standard ◽  
Medium Density ◽  
Wood Fibers ◽  
Strong Adsorption ◽  
Cellulose Surface

ABSTRACT Effects of nanowollastonite (NW) adsorption on cellulose surface were studied on physical and mechanical properties of medium-density fiberboard (MDF) panels; properties were then compared with those of MDF panels without NW-content. The size range of NW was 30-110 nm. The interaction between NW and cellulose was investigated using density functional theory (DFT). Physical and mechanical tests were carried out in accordance with the Iranian National Standard ISIRI 9044 PB Type P2 (compatible with ASTM D1037-99) specifications. Results of DFT simulations showed strong adsorption of NW on cellulose surface. Moreover, mechanical properties demonstrated significant improvement. The improvement was attributed to the strong adsorption of NW on cellulose surface predicted by DFT, adding to the strength and integrity between wood fibers in NW-MDF panels. It was concluded that NW would improve mechanical properties in MDF panels as a wood-composite material, as well as being effective in improving its biological and thermal conductivity.

scholarly journals KUALITAS PAPAN PARTIKEL BERDASARKAN KOMPOSISI SEKAM PADI DAN KAYU SENGON DENGAN VARIASI KADAR PEREKAT

2019 ◽  
Vol 7 (2) ◽  
Author(s):  
Dendi Prayoga ◽  
. Dirhamsyah ◽  
. Nurhaida
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Rice Husk ◽  
Raw Materials ◽  
Urea Formaldehyde ◽  
Physical And Mechanical Properties ◽  
Solid Content ◽  
Particle Board ◽  
Rice Husks ◽  
Wood Processing

This research aimed to examine the physical and mechanical properties of particle boards based on the composition of raw materials and adhesive content and know the treatment of the composition of raw materials and the best adhesive content and meet the standard JIS A 5908-2003. The research was conducted at Wood Workshop Laboratory, Wood Processing Laboratory Faculty of Forestry,Tanjungpura University and Laboratory of PT. Duta Pertiwi Nusantara Pontianak. The adhesive used is Urea Formaldehyde with 52% Solid Content. Comparison of the composition of rice husks and sengon varies namely rice husk 50%: sengon 50%, rice husk 60%: sengon 40% and rice husk 70%: sengon 30%  and variations in the levels of UF adhesives, namely 14% and 16%, with target density 0,7 gr/cm3. The particleboard was 30 cm x 30 cm x 1 cm Pressing at temperature 140oC for 8 minutes, with  pressure of 25 kg/cm2. The research results of the study of density and moisture content meet the standards JIS A 5908-2003. The best particle values of rice husk and sengon  with composition a ratio of  rice husk 50%: sengon 50% , 16% adhesive content  16%, with density value of  0,7072 gr/cm3, moisture content 9,1949 %, thick development 12,3210 %, water absorption 68,8270 %, MOE 12110,7273 kg/cm2, MOR 161,0025 kg/cm2, firmness sticky 1,9320 kg/cm2, screw holding strength 62,3124 kg.Keywords : adhesive, composition, particle board, rice husk, sengon

scholarly journals SIFAT FISIK DAN MEKANIK KAYU SALAM (Syzygium polyanthum (Wight)Walp.) BERDASARKAN POSISI KETINGGIAN PADA BATANG

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
. Erma ◽  
Fadiilah H Usman ◽  
. Muflihati
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Physical And Mechanical Properties ◽  
Modulus Of Rupture ◽  
Average Height ◽  
Class Iii ◽  
Lightweight Construction ◽  
Brown Colour ◽  
Wood Demand ◽  
Selection Of

Physical and mechanical properties of wood is one of the basic properties that need to be known in the selection of wood, because the physical and mechanical properties of wood are not the same height on the stem. Increased wood demand gives the opportunity to use wood that is not yet known for its marketing, one of which is Salam wood (Syzygium polianthum (Wight) Walp). The purpose of this research was to determine the physical and mechanical properties of Salam wood based on the height of the stem so that Salam wood can be optimally utilized by testing based on Classification SNI – 5 PKKI 1961. Methods of making test and test examples based on British Standard Methods No. 373-1957. The results showed that Salam wood has physical properties with an average  brown colour, the moisture content 3,13 % , density  0,58 kg/cm2 , Depreciation 2,59 %. Salam has mechanical properties with an average height position stem from base to tip with Modulus of Elastiscity (MOE)  97.701,54 , Modulus of Rupture (MOR) 659,18  and  Modulus Crushing  Streang 342,86 . Salam can be classified into strong class III and based on its properties and mechanics, it is suitable for use as a lightweight construction and furniture.Keywords: Density, depreciation, MCS, MOE, moisture content, MOR

scholarly journals KUALITAS PAPAN KOMPOSIT LIMBAH KULIT BATANG SAGU (Metroxylon sp) DAN PLASTIK POLIPROPILENA BERDASARKAN JUMLAH LAPISAN PENYUSUN

2018 ◽  
Vol 7 (1) ◽  
Author(s):  
Mayang Archila ◽  
Farah Diba ◽  
Dina Setyawati ◽  
. Nurhaida
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Physical And Mechanical Properties ◽  
Modulus Of Rupture ◽  
Internal Bonding ◽  
Thickness Swelling ◽  
Composite Board ◽  
Average Value ◽  
Composite Layers ◽  
Sago Bark

The objective of this research is to evaluate the effect of the number of composite layers on the quality of the composite board from sago bark waste and plastic waste, and the number of composite layers that produce the best quality on composite board. The composite board is made with size 30 cm x 30 cm x 1 cm. The composition and division of the material was carried out manually with the polypropylene distribution divided into three parts: the front and rear respectively of 15%, and the center 70% of the plastic weight. Target density of composite boards was 0.7 g / cm3. The treatment used is based on the number of layers composing, which is 5 layers, 7 layers, 9 layers, 11 layers and 13 layers. After mixed the sago bark particle and waste of polypropylene, the materials then compressed with hot press at 180oC with pressure about ± 25 kg / cm2 for 10 minutes. The composite boards then tested the quality included physical and mechanical properties. Testing of physical and mechanical properties refers to JIS A 5908-2003 standard. Physical properties consist of density, moisture content, thickness swelling, and water absorption. Mechanical properties consist of modulus of rupture, modulus of elasticity, internal bonding, and modulus of screw holding strength. The study used a completely randomized design experiment consisting of 5 treatments and 3 replications. The results showed the average value of composite density was range between 0.6962 – 0.7896 g/cm3, the moisture content was range between 4.3388 % - 6.8066%, the thickness swelling was range between 8.2605% - 11.9615%, and water absorption was range between 17.2380% - 22.3867%. The average value of modulus of rupture was range between 60,0632 kg/cm2 – 64,4068 kg/cm2, the modulus of elasticity was range between 17935,1813g/cm2 – 32841,8278 kg/cm2, the internal bonding was range between 1,9268 kg/cm2  - 5,4119 kg/cm2, and the modulus of screw holding strength was range between 78,2530 kg/cm2 – 92,9677 kg/cm2. The composite board made from sago stem bark waste and polypropylene waste plastic with 13 layers treatment is the best composite board and fulfilled the JIS A 5908-2003 standard. Keywords: bark of sago, composite boards, layer of composite, polypropylenes plastic, waste

scholarly journals Analysis of Nutritional Composition in 23 Kinds of Edible Fungi

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Qiannan Yu ◽  
Meijuan Guo ◽  
Bin Zhang ◽  
Hao Wu ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Moisture Content ◽  
Protein Content ◽  
Dietary Fiber ◽  
Nutritional Value ◽  
Dry Weight ◽  
Nutritional Composition ◽  
Ash Content ◽  
National Standard ◽  
Edible Fungi ◽  
Standard Methods

To explore the differences in the main nutritional composition of 23 kinds of common edible fungi in the market, the moisture, ash, protein, fat, dietary fiber, carbohydrates, polysaccharides, and energy were analyzed using national standard methods. The results showed that the 23 kinds of edible fungi varied greatly in nutritional composition. Based on dry weight, the moisture content was 6.9∼15.5 g/100 g, the ash content ranged from 1.3 to 10.1 g/100 g, the protein content ranged from 8.5 to 36.9 g/100 g, the fat content was 0.5∼3.9 g/100 g, the dietary fiber content was between 14.4∼70.2 g/100 g, the carbohydrate content is 0.5∼37.3 g/100 g, the polysaccharide content was 2.1∼8.3 g/100 g, and the energy is about 751∼1322 100 g/kJ. All the 23 kinds of edible fungi can be regarded as high-protein low-fat foods, which have their own advantages in terms of nutritional value. This study provides reference for people to use edible fungi in a more scientific and reasonable way.

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