scholarly journals Reduction in Pavement Thickness by Using Geogrid

2018 ◽  
Vol 7 (3.3) ◽  
pp. 17
Author(s):  
Sruthi Vennamaneni ◽  
Nookapati Raju Aketi ◽  
Sravanthi Paisa
Keyword(s):  
Double Layer ◽  
High Strength ◽  
Red Soil ◽  
Tropical Countries ◽  
Geogrid Reinforcement ◽  
Naturally Occurring ◽  
Low Volume ◽  
Pavement Construction ◽  
Grid Reinforcement ◽  
Pavement Thickness

An effective way of improving the properties of naturally occurring soils for pavement construction is by using geo-synthetics. In many tropical countries, weak lateritic sub grades are common and often rejected after proof rolling during construction due to poor strength. The main aim of this research was to check the effect of geo-grid reinforcement  on  CBR value on a sample of relatively Red soil subgrade  under soaked and Unsoaked conditions and to Establish the effect of geogrid reinforced subgrade on the design thickness of low volume paved roads. Even though Red Soil has high strength but if we apply geogrids results going to be checked. Then by placing a layer of a Bi-axial geogrid at different heights like one layer at h/2, two layer at h/5 top and bottom ,three layers at h/6 top, bottom and middle , the effects of geogrid reinforcement on California Bearing Ratio values are investigated. This was undertaken for three strengths of geogrid and without geogrids in both soaked and Unsoaked conditions. The CBR values were used to determine the pavement thicknesses. The results indicate that the pavement thickness is reduced by 21.31% by using double layer in the Soaked condition i.e. Worse condition.  

scholarly journals Soil microbiomes mediate degradation of vinyl ester-based polymer composites

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Adam M. Breister ◽  
Muhammad A. Imam ◽  
Zhichao Zhou ◽  
Md Ariful Ahsan ◽  
Juan C. Noveron ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Polymer Composite ◽  
Structural Integrity ◽  
Abiotic Factors ◽  
High Strength ◽  
Strength Properties ◽  
Naturally Occurring ◽  
Structural Applications ◽  
Acrylate Esters ◽  
Bacterial Groups

AbstractPolymer composites are attractive for structural applications in the built environment due to their lightweight and high strength properties but suffer from degradation due to environmental factors. While abiotic factors like temperature, moisture, and ultraviolet light are well studied, little is known about the impacts of naturally occurring microbial communities on their structural integrity. Here we apply complementary time-series multi-omics of biofilms growing on polymer composites and materials characterization to elucidate the processes driving their degradation. We measured a reduction in mechanical properties due to biologically driven molecular chain breakage of esters and reconstructed 121 microbial genomes to describe microbial diversity and pathways associated with polymer composite degradation. The polymer composite microbiome is dominated by four bacterial groups including the Candidate Phyla Radiation that possess pathways for breakdown of acrylate, esters, and bisphenol, abundant in composites. We provide a foundation for understanding interactions of next-generation structural materials with their natural environment that can predict their durability and drive future designs.

PENENTUAN SIFAT KEKUKUHAN DAN KETEBALAN LAPISAN PERMUKAAN BERASFALT MENGGUNAKAN KAEDAH PENCARIAN RESONAN TAMBAHAN (ERS)

2015 ◽  
Vol 76 (1) ◽  
Author(s):  
Nur Mustakiza Zakaria ◽  
Muhammad Fakhry Md. Jaffary ◽  
Muhammad Kamal Hassan ◽  
Asmah Hamim ◽  
Nur Izzi Md. Yusoff ◽  
...  
Keyword(s):  
Elastic Moduli ◽  
Public Works ◽  
Traffic Load ◽  
Average Value ◽  
Resonance Search ◽  
Materials Used ◽  
Pavement Construction ◽  
Pavement Thickness ◽  
Good Agreement

This study was conducted to investigate the stiffness and thicknesses of asphalt surface layer using the Enhance Resonance Search (ERS) technique. A total of fifteen locations in the Universiti Kebangsaan Malaysia (UKM) Campus have been identified to carry out this experiment. The results were then compared with standards provided by the Malaysian Public Works Department (PWD), Jabatan Pembangunan dan Penyelenggaraan (JPP) UKM and Kumpulan IKRAM Sdn. Bhd. The computation found that the range of elastic moduli values of asphalt layer is between 3928.877 and 17726.012 MPa. A comparison between the experiment results and JPP UKM standard on pavement thickness showed that the different is between 20% to 60%, with the average thickness of 44.13 mm.  However, the average value of thickness is still in good agreement with the JKR and JPP UKM standards. Some stiffness values obtained are higher than the standard, probably due to the quality of materials used, the influence of the traffic load and the age of the pavement construction.

scholarly journals Polysaccharide-derived mesoporous materials (Starbon®) for sustainable separation of complex mixtures

2017 ◽  
Vol 202 ◽  
pp. 451-464 ◽  
Author(s):  
Vânia G. Zuin ◽  
Vitaliy L. Budarin ◽  
Mario De bruyn ◽  
Peter S. Shuttleworth ◽  
Andrew J. Hunt ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Phenolic Compounds ◽  
Surface Structure ◽  
Mesoporous Materials ◽  
Solid Phase ◽  
Stationary Phases ◽  
Complex Mixtures ◽  
Naturally Occurring ◽  
Low Volume ◽  
First Time

The recovery and separation of high value and low volume extractives are a considerable challenge for the commercial realisation of zero-waste biorefineries. Using solid-phase extractions (SPE) based on sustainable sorbents is a promising method to enable efficient, green and selective separation of these complex extractive mixtures. Mesoporous carbonaceous solids derived from renewable polysaccharides are ideal stationary phases due to their tuneable functionality and surface structure. In this study, the structure–separation relationships of thirteen polysaccharide-derived mesoporous materials and two modified types as sorbents for ten naturally-occurring bioactive phenolic compounds were investigated. For the first time, a comprehensive statistical analysis of the key molecular and surface properties influencing the recovery of these species was carried out. The obtained results show the possibility of developing tailored materials for purification, separation or extraction, depending on the molecular composition of the analyte. The wide versatility and application span of these polysaccharide-derived mesoporous materials offer new sustainable and inexpensive alternatives to traditional silica-based stationary phases.

Application of Fiberglass-Polyester Paving Mat in Engineering

2012 ◽  
Vol 488-489 ◽  
pp. 485-489 ◽  
Author(s):  
Chao Jue Yi ◽  
Peng Cheng Zhai
Keyword(s):  
Asphalt Pavement ◽  
Engineering Application ◽  
High Strength ◽  
Water Infiltration ◽  
Pavement Performance ◽  
Synthetic Material ◽  
Forming Mechanism ◽  
The Road ◽  
Pavement Construction ◽  
Reflection Crack

Fiberglass-Polyester Paving Mat is a new compound synthetic material, and a compound of fiberglass and polyester, which advantages include high strength, low elongation, good compatibility with bitumen, resistance of high temperature and corrosiveness. This paper mainly elaborated the performance of Fiberglass-Polyester Paving Mat, such as delaying cracking, alleviating the crack development, which can effectively prevent the road surface water infiltration and improve the pavement performance in asphalt pavement construction and transformation. Based on the forming mechanism of reflective cracks, this article describes the engineering application of fiberglass-polyester paving mat in the prevention of reflection crack of bituminous pavement and in waterproofing of the paving layer in tunnels, thus providing the basis for the application of Fiberglass-Polyester Paving Mat in highway construction and maintenance engineering.

scholarly journals Effects of Low Volume Fraction of Polyvinyl Alcohol Fibers on the Mechanical Properties of Oil Palm Shell Lightweight Concrete

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Ming Kun Yew ◽  
Hilmi Bin Mahmud ◽  
Bee Chin Ang ◽  
Ming Chian Yew
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Polyvinyl Alcohol ◽  
Oil Palm ◽  
Lightweight Concrete ◽  
Volume Fraction ◽  
High Strength ◽  
Palm Shell ◽  
Oil Palm Shell ◽  
Low Volume

This paper presents the effects of low volume fraction(Vf)of polyvinyl alcohol (PVA) fibers on the mechanical properties of oil palm shell (OPS) high strength lightweight concrete mixtures. The slump, density, compressive strength, splitting tensile strength, flexural strength, and modulus of elasticity under various curing conditions have been measured and evaluated. The results indicate that an increase in PVA fibers decreases the workability of the concrete and decreases the density slightly. The 28-day compressive strength of oil palm shell fiber-reinforced concrete (OPSFRC) high strength lightweight concrete (HSLWC) subject to continuous moist curing was within the range of 43–49 MPa. The average modulus of elasticity (E) value is found to be 16.1 GPa for all mixes, which is higher than that reported in previous studies and is within the range of normal weight concrete. Hence, the findings of this study revealed that the PVA fibers can be used as an alternative material to enhance the properties of OPS HSLWC for building and construction applications.

scholarly journals DEVELOPMENT OF DOUBLE LAYER SPACE TRUSS WITH ULTRA HIGH STRENGTH FIBER REINFORCED CONCRETE

2008 ◽  
Vol 14 (28) ◽  
pp. 459-464
Author(s):  
Yoshiko HASEGAWA ◽  
Toshiyuki KANAKUBO ◽  
Fukuma IIHOSHI ◽  
Kazuyoshi SHIRAI ◽  
Keisuke YONEMARU
Keyword(s):  
Reinforced Concrete ◽  
Double Layer ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Space Truss ◽  
High Strength Fiber

scholarly journals Microbial dark matter driven degradation of carbon fiber polymer composites

2020 ◽  
Author(s):  
Adam M. Breister ◽  
Muhammad A. Imam ◽  
Zhichao Zhou ◽  
Karthik Anantharaman ◽  
Pavana Prabhakar
Keyword(s):  
Polymer Composites ◽  
Structural Integrity ◽  
Abiotic Factors ◽  
High Strength ◽  
Strength Properties ◽  
Naturally Occurring ◽  
Structural Applications ◽  
Acrylate Esters ◽  
First Time ◽  
Bacterial Groups

AbstractPolymer composites have become attractive for structural applications in the built environment due to their lightweight and high strength properties but can suffer from degradation due to environmental factors. While impacts of abiotic factors like temperature and moisture are well studied, little is known about the influence of naturally occurring microbial communities on their structural integrity. Here we apply complementary time-series multi-omics of biofilms growing on polymer composites and materials characterization to elucidate, for the first time, the processes driving their degradation. We measured a reduction in mechanical properties due to molecular chain breakage and reconstructed 121 microbial genomes to describe microbial diversity and pathways associated with their degradation. The composite microbiome is dominated by four bacterial groups including the Candidate Phyla Radiation that possess pathways for breakdown of acrylate, esters, and bisphenol, abundant in composites. Overall, we provide a foundation for understanding interactions of next-generation structural materials with their natural environment that can predict their durability and drive future designs.

scholarly journals Perencanaan Tebal Perkerasan Jalan Sergang – Jembatan Jengkong (No. 243) KM 8 Batu Putih Kabupaten Sumenep

2019 ◽  
Vol 2 (2) ◽  
pp. 89
Author(s):  
Muhammad Baitur Rakhman ◽  
Ahmad Suwandi
Keyword(s):  
Quantitative Research ◽  
Secondary Data ◽  
Flexible Pavement ◽  
Primary Data ◽  
The Road ◽  
Access Road ◽  
Distribution Process ◽  
Pavement Construction ◽  
Microsoft Office ◽  
Pavement Thickness

The white stone mine in Batu Putih Village is one of the natural resources located in Sumenep Regency, precisely on Sergang Street - Jengkong Bridge No. 243 Km 8. This road is the only access road to the white stone mining. The current condition of the road is damaged and interferes with the distribution process of white stones, so good thick pavement planning is needed. Planning of flexible pavement thickness and the cost of flexible pavement construction on Sergang - Jengkong Bridge No. 243 Km 8 Batu Putih, Sumenep Regency uses quantitative research. The data collection process uses two types of data, the first is primary data which includes LHR data and the second is secondary data which includes literature and literature studies. In this research the data analysis technique uses Microsoft Office Excel which is to calculate the budget plan and Autocad for drawing. For calculation procedures adjusted to SNI -1732-1989. The results of the Average Daily Traffic Survey (LHR) obtained the total number of vehicles passing through by 21164 smp. The road to be planned is 3 Km long and 4 m wide. Calculation of pavement thickness using the laston AC-WC is 2.50 cm thick and will be planned to be 4 cm thick. The planned budget (RAB) for the road planning is Rp. 2,613,171,000.00 (two billion six hundred thirteen million one hundred seventy-one thousand rupiah).

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