scholarly journals Unconventional and Simplified Approach towards Unpaved Roads: Application of Geosynthetics

2021 ◽  
Vol 9 (11) ◽  
pp. 98-107
Author(s):  
Suhail Akram
Keyword(s):  
Road Construction ◽  
Test Site ◽  
Sandy Gravel ◽  
Unpaved Road ◽  
Simplified Approach ◽  
Synthetic Materials ◽  
Significant Difference ◽  
Base Course Material ◽  
Base Course ◽  
Materials Used

Abstract: A field trial was carried out to investigate the performance of different unconventional geosynthetic materials in unpaved road construction over soft ground.The test site comprises of 25 m long, by 3 m wide test sections, built on a subgrade of undrained shear strength approximately 45 kPa . One isunreinforced and serves as a control section in the study, three sections includea geotextile, and one includes a geogrid. Each test section incorporated avariable thickness of sandy gravel base course material, between25 and 45 cmthick. They were loaded in sequence by a vehicle of standard axle load.Performance of the test sections was evaluated from measurements of rut depth, base course thickness, base course deformations, geosynthetic strain, and deformed profile of the geosynthetic, with increasing number of vehicle passes.The four geosynthetic materials used exhibited a broad range of stiffness and material properties ,but the general performance of the four reinforced sections was similar on the base course layers. On contrary thinner subgrades showed a significant difference between the geosynthetics Keywords: Geo-synthetic materials, geo-textile, geo-grid, unpaved road.

Analyzing the Application of Different Sources of Recycled Concrete Aggregate for Road Construction

2020 ◽  
Vol 2674 (8) ◽  
pp. 300-308
Author(s):  
Nazanin Ardalan ◽  
Douglas J. Wilson ◽  
Tam J. Larkin
Keyword(s):  
New Zealand ◽  
Road Construction ◽  
Recycled Concrete ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate ◽  
Base Course Material ◽  
Course Material ◽  
Base Course ◽  
Natural Aggregates ◽  
Pavement Construction

Because of the environmental, planning, and resource restrictions in the exploration and processing of natural aggregates, interest in better utilizing recycled aggregates in road pavement construction is increasing. Several researchers have investigated the characteristics of recycled concrete aggregate (RCAg) with the aim of understanding its performance as a base-course unbound material. As the pavement design techniques and the properties of re-processed RCAg in each country are non-homogeneous, previous international research on recycled aggregate cannot necessarily be incorporated in New Zealand’s pavement specifications. Moreover, RCAg is mainly sourced from vertical or horizontal concrete demolished structures. These sources of material have different engineering characteristics, and there is a lack of information about their performance. This paper investigates the difference between the properties of these two vertical and horizontal sources, and it evaluates their application as an unbound granular base-course material as opposed to an alternative layer in the pavement, for road construction in New Zealand. The physical properties of RCAgs engineering performance (durability) were evaluated through experimental laboratory-based tests. Also, the characteristics of the tested RCAgs were compared with the specification of base-course materials (NZ Transport Agency M4) in New Zealand, and their appropriateness for high-performing pavement construction layers was assessed. According to the tests results, the tested RCAgs have proven to meet the “premium” base-course grade product, and it is expected that recycled crushed concrete, if production processes are appropriately managed, could have great potential use as a base-course material in road construction and in some cases perform better than common natural aggregates.

scholarly journals PENGARUH PENAMBAHAN SILICA FUME PADA KARAKTERISTIK GEOTEKNIK DAN KIMIA DARI LIMBAH PELABUHAN DALAM PENGGUNAANNYA PADA PEKERJAAN PEMBANGUNAN JALAN

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Ernesto Silitonga
Keyword(s):  
Silica Fume ◽  
Mechanical Characteristics ◽  
Road Construction ◽  
Chemical Characteristic ◽  
Pollution Level ◽  
Leaching Test ◽  
Dredged Sediment ◽  
Dredged Sediments ◽  
Base Course Material ◽  
Base Course

ABSTRAKPeningkatan jumlah sedimen hasil pekerjaan pengerukan di Perancis setiap tahunnya.Semenjak diterapkannya peraturan mengenai limbah hasil pekerjaan pengerukan, pembuangan ke dalam laut tidak dianjurkan karena terbukti dapat menyebarkan polusi kedaerah sekitarnya.Penggunaan kembali dari limbah pelabuhan hasil pekerjaan pengerukan ini sangat perlu direalisasikan dengan segera.Tujuan utama dari penelitian ini adalah untuk menemukanbidang aplikasi reutulisasi dari limbah pelabuhan hasil pekerjaan pengerukan.Dalam upaya mengetahui apakah limbah pelabuhan tersebut dapat digunakan dalam pembangunan jalan, beberapa percobaan geoteknik dan kimia direalisasikan. Tujuan sekunder dari penelitian ini adalah untuk meningkatkan performa geoteknik dan mengurangi kadar polusi pada limbah pelabuhan sehingga dapat memenuhi kriteria dari pembangunan jalan dan aman terhadap lingkungan sekitar. Untuk memenuhi tujuan tersebut Silica Fume digunakan dalam penelitian ini.Beberapa percobaan geoteknik dan kimia direalisasikan dalam penelitian ini.Berdasarkan hasil yang didapatkan, Silica Fume sangat efektif dalam meningkatkan performa geoteknik dan memenuhi persyaratan geoteknik dalam pemgangunan jalan. Percobaan kimia (leaching test) direalisasikan dan hasilnya memperlihatkan bahwa pengaruh Silica Fume dalam campuran terbukti dapat mengurangi kadar polutan yang terkandung dalam limbah pelabuhan hasil pekerjaan pengerukan. Hasil percobaan ini memperlihatkan  bahwa dengan penambahan Silica Fume, Limbah pelabuhan dianggap dapat digunakan sebagai material pengganti dalam pembangunan jalan dan aman bagi lingkungan sesuai dengan peraturan yang berlaku di Perancis.Kata Kunci : Geoteknik, Limbah, Pelabuhan, Silica Fume  ABSTRACT Due to the increase of the amount of marine dredged sedimentsin France every year, especially with the European Environmental regulation established, environmentally reuse of dredged sediment is urgently needed in France. The first objective of this study is to find an application for reuse of marine dredged sediments materials, as a new material for road construction. Hence, serial tests need to be realized to identify if marine dredged sediment could be utilized for road construction. The second goal is to enhance the physical, mechanical and chemical characteristics of the mix, by incorporating binders and sediments, and revealed the identification of the mechanical characteristics measured on the mixes is compatible with their use as a base course material. The results show that the treatment by hydraulics binders could satisfy the needed mechanical characteristics. The present of Silica Fume is aimed to reduce the pollution level, especially the heavy metal content. However, the proportion of hydraulics binders and silica fume needed to meet prescribed specification is important, so the reuse of the marine dredged sediments of Port-en-Bessin, France in road construction, as an alternative material could be achieved. After the geotechnical study in laboratory results show as expected then the study to identify the chemical characteristic realized. To evaluate the environmental impacts of the used material, leaching test is performed. The leaching test was performed to verify the predicted release of pollutants based on total dissolution. Keywords: Geotechnical, Port, Silica Fume 

Use of coir geotextiles in unpaved road construction

2010 ◽  
Vol 17 (4) ◽  
pp. 220-227 ◽  
Author(s):  
P. Vinod ◽  
M. Minu
Keyword(s):  
Road Construction ◽  
Unpaved Road

scholarly journals KNOWLEDGE, AWARENESS, AND PRACTICES REGARDING BIOMEDICAL WASTE MANAGEMENT AMONG UNDERGRADUATE DENTAL STUDENTS

2017 ◽  
Vol 10 (8) ◽  
pp. 341
Author(s):  
Santhosh Kumar ◽  
Reshma Rahman
Keyword(s):  
Waste Management ◽  
Waste Disposal ◽  
Dental Students ◽  
Management Policy ◽  
Biomedical Waste ◽  
Significant Difference ◽  
Control Procedures ◽  
Materials Used ◽  
Level Of Significance ◽  
Policy Systems

Objective: The objective of this study was to assess the knowledge, awareness, and practices of dental students regarding biomedical waste (BMW)management.Methods: A self-administered structured questionnaire consisting of 16 questions on knowledge, awareness, and practices about BMW managementwas distributed among 100 students randomly belonging to 3rd year, final year and intern students of Saveetha Dental College, Saveetha University,Chennai. The data extracted were tabulated, statistically analyzed using SPSS version 20.0 and results obtained. The data were analyzed using ANOVAtest (all the results are calculated at 1% level of significance) and Post-hoc test.Results: Overall, 67% respondents were aware of the existing BMW management policy systems in India. 62% of students were aware about thecorrect color coding management system for hospital waste management that prevails in India. 86% of students knew about the dental wastecategories of materials used in dentistry. There was a statistically significant difference of knowledge levels among the 3rd year, final year students andthe interns. 100% practice discarding sharps in the puncture-proof containers. Only 27% of the respondents discarded the extracted tooth in a properway. Only 51% of them have attended previous training programs on dental waste management. There was also a statistically significant difference ofBMW disposal practices among the three groups.Conclusion: The majority of dental students in our study have good level of knowledge and awareness regarding BMW management in dental clinics.However, their practice toward BMW disposal was poor. Hence, the knowledge acquired must be put into practice. Intern students have the highestlevel of knowledge and practices toward dental waste disposal when compared to final year and 3rd year students. Hence, these findings imply thatproper training, continuing education programs, and short-term courses about BMW management, and infection control procedures are requiredto motivate the dental students and dental auxiliaries. The importance of training regarding BMW management must be emphasized as the lack ofproper and complete knowledge about BMW management impacts practices of appropriate waste disposal.

scholarly journals Efektivitas Metode Seleksi Pedigree dan Modified Bulk pada Tiga Populasi Sorgum (Sorghum bicolor [L.] Moench)

2020 ◽  
Vol 47 (3) ◽  
pp. 275-282
Author(s):  
Dewi Andriani ◽  
Desta Wirnas ◽  
Dan Trikoesoemaningtyas
Keyword(s):  
Plant Height ◽  
Agronomic Traits ◽  
Test Results ◽  
Selection Methods ◽  
Coefficients Of Variation ◽  
Significant Difference ◽  
Pedigree Selection ◽  
High Heritability ◽  
Augmented Design ◽  
Materials Used

Sorghum has a growing popularity for food, feed, biofuel, and therefore needs to be developed. The research aimed to compare the effectiveness of pedigree and modified bulk selection methods for improving yield in three sorghum populations. The genetic materials used were 60 F6 lines from three populations, namely PI 10-90-A x Numbu, PI 150-20-A x Numbu and PI 150-20-A x Kawali which had been selected using pedigree and modified bulk methods. The experiment was conducted from October 2018 to February 2019 at the Cikabayan Experimental Station of IPB University, Dramaga, Bogor. The experiment was arranged in an augmented design with six checks, namely Kawali, Numbu, PI 10-90-A, PI 150-20-A, Samurai 1, and Samurai 2 which were replicated four times. Observations were made on agronomic traits and yield. Plant height and grain weight per panicle had high heritability and large genotypic coefficients of variation. The contrast test results showed significant differences between populations in plant height, panicle length, days of harvesting and 100-seed weight. On the other hand, no significant difference was observed among selection methods, indicating that both methods were equally effective for increasing sorghum yield. The pedigree selection and modified bulk selection increased grain yield per panicle by 14.1 g and 18.2 g respectively. Bulk of the best genotypes in early generation could be an alternative of bulk selection method. Keywords: contrast test, differential selection, genotypic coefficient of variation, heritability

scholarly journals Daya Gabung Beberapa Varietas Padi (Oryza sativa L.) pada Persilangan Dialel Menggunakan Metode Griffing II

2021 ◽  
pp. 84-93
Author(s):  
Anak Agung Ketut Sudharmawan ◽  
Baiq Erna Listiana ◽  
Sofi Rianti
Keyword(s):  
Oryza Sativa ◽  
Plant Height ◽  
Power Analysis ◽  
Oryza Sativa L ◽  
Panicle Length ◽  
Grain Number ◽  
Significant Difference ◽  
Diallel Crossing ◽  
High Yielding Varieties ◽  
Materials Used

Diallel crossing is a method that is widely used to determine the ability to combine each individual so that it can identify the potential elders to be used in crossbreeding programs to assemble high yielding varieties. This experiment aims to determine the combining power of dialelic crosses of several varieties of rice using the Griffing II method, carried out in the experimental field of the Faculty of Agriculture, Mataram University in Nyiur Lembang Village, Narmada District, West Lombok Regency, from February to July 2019. This experiment uses the method experiments carried out in the field. The materials used in this experiment were four parents, namely IPB 3S variety, Situ Patenggang variety, Inpari 32 and G11 strain and the phenotype of the cross between the four parents. The experimental results showed that the effects of general affinity and special affinity for all observed characters (plant height, number of productive tillers, number of non-productive tillers, panicle length, number of filled grain, number of empty grain and weight of 100 grains) were significantly different, except on the effect of general affinity for the number of non-productive tillers showed no significant difference. The results of the combined power analysis of the four elders were positive, so it can be said that the four elders would get good results when crossed with a number of other genotypes.

scholarly journals Effectiveness of Environmentally Friendly Mosquito Trap Contained Sugar Yeast Solution

2017 ◽  
Vol 12 (2) ◽  
pp. 270-276 ◽  
Author(s):  
Tutik Ida Rosanti ◽  
S Juwono Mardihusodo ◽  
Wayan T Artama
Keyword(s):  
Experimental Design ◽  
Environmentally Friendly ◽  
P Value ◽  
Mosquito Trap ◽  
Significant Difference ◽  
Rank Score ◽  
Quasi Experimental ◽  
Two Phases ◽  
Materials Used ◽  
Indoor And Outdoor

Environmentally friendly mosquitoes trap using common daily materials used by community may give hopes in reducing mosquitoes density. This study aims to determine the effectiveness of environmentally friendly mosquitoes trap made from bottle contained sugar yeast solution for reducing the number of trapped mosquitoes. This study consist of two phases and quasi experimental design was used. Mann Whitney test was used to determine the differences the number of trapped mosquitoes indoor and outdoor. The result showed p value 0,000 which was lower than ? value (0,05), so there was significant difference between the number of indoor and outdoor trapped mosquitoes. The average Rank score of outdoor mosquitoes trap (42,75) was more than indoor mosquitoes trap (18,25). We concluded that the mosquitoes trapped which contained of sugar-yeast solution was effective for trapping the mosquitoes especially outdoor .

scholarly journals The effect of optical brightening toothpaste on the color stability of esthetic restorative materials

2021 ◽  
Vol 11 (Suppl. 1) ◽  
pp. 81-85
Author(s):  
Firdevs Kahvecioğlu ◽  
Elçim Çoban ◽  
Hayriye Esra Ülker
Keyword(s):  
Color Change ◽  
Calculated Data ◽  
Color Stability ◽  
Color Changes ◽  
Significant Difference ◽  
Restorative Materials ◽  
Cherry Juice ◽  
Native Speakers Of English ◽  
Materials Used ◽  
Post Hoc

Aim: The aim of this study is to evaluate the effects of whitening toothpaste applications on the color stability of different tooth-colored restorative materials (Fuji IX, GC Fuji II LC, Equia Forte, and Kerr Point 4)  Methodology: Standardized fourty disc-shaped specimens were prepared from esthetic restorative materials and polished. The baseline color values of each specimen were then measured using a spectrophotometer, according to the Commission Internationale de l'Eclairage L*, a*, and b* (CIELAB) color scale. Ten specimens from each group were then immersed in two different beverages (cherry juice and coke) for seven days. After immersion, the color value of each specimen was re-measured. Each sample was brushed with whitening toothpaste for 30 seconds using an electric toothbrush. The samples were kept in distilled water at room temperature and brushing continued twice a day for seven days. The color change value, Delta E (ΔE), was calculated. Data were analyzed by two-way ANOVA and post hoc Tukey's test. Results: When the results were evaluated, after the colored samples had been brushed with whitening toothpaste, a difference was found between the Delta E values according to the materials used (p<0.001), but no difference was found in relation to the beverages (p>0.001). When the values of the color changes were evaluated after the first brushing with whitening toothpaste and before the specimens were colored with drinks, a difference was observed in the Fuji II cola, Fuji II cherry, and Equia Forte cola groups (p<0.05). When the values of the color changes were evaluated for specimens in which brushing had been done twice a day for seven days with whitening toothpaste and before they were colored with drinks, a significant difference was observed in the Fuji II cherry and Equia Forte cola groups (p<0.05). Conclusion: Using Signal White Now whitening toothpaste for 2 min 2 times a day for seven days caused significant changes in the color of the restorative materials. The color change is dependent upon the type of restorative material that is used.   How to cite this article: Kahvecioğlu F, Çoban E, Ülker HE. The effect of optical brightening toothpaste on the color stability of esthetic restorative materials. Int Dent Res 2021;11(Suppl.1):80-4. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.13   Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

Sign in / Sign up

Export Citation Format

Share Document