scholarly journals The Effects of Geocell Height and Lime Stabilization on Unpaved Road Settlements at Different Water Contents

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Erhan Burak Pancar ◽  
Aytuğ Kumandaş
Keyword(s):  
Large Scale ◽  
Road Construction ◽  
Soil Improvement ◽  
Loading Test ◽  
Lime Stabilization ◽  
Unpaved Road ◽  
Lime Content ◽  
Constant Height ◽  
Technical Specifications ◽  
Water Contents

In this study, lime stabilization and geocell reinforcement methods were investigated for a clayey subgrade of unpaved road at different water contents. This study is especially important in terms of determining the soil improvement method for road construction on wet lands. The effects of the geocell height (50, 100, 150, and 200 mm) and lime content (3, 6, and 12%) on the settlement of the subgrade soil at different water contents (25, 28, 30, 32, and 35%) were analyzed. Accordingly, a large scale plate loading test was designed, and it is utilized to achieve loading-settlement curves. The bearing capacity and modulus of subgrade (k) of soil were determined. It was detected that the geocell height and lime content have different effects at different water contents, and the modulus of subgrade reaction became stable beyond a constant height of the geocell. It was understood that none of these two improvements did not meet the Highways Technical Specifications. It is detected that at least these two improvement techniques are needed to be applied together to meet the specifications for the soil examined in this study.

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

Evaluation Indexes System for Assessing Road Construction with Recycled Waste Materials to Achieve Better Environmental Impacts

2011 ◽  
Vol 250-253 ◽  
pp. 1001-1006 ◽  
Author(s):  
De Zhen Chen ◽  
Cui Jie Geng ◽  
Wen Zhou Sun
Keyword(s):  
Energy Consumption ◽  
Environmental Impact ◽  
Waste Disposal ◽  
Large Scale ◽  
Construction Material ◽  
Bottom Ash ◽  
Road Construction ◽  
Waste Materials ◽  
Evaluation Indexes ◽  
Recycled Waste

Evaluation indexes system has been put forward in this paper for quantifying thesystematical energy consumption, resources consumption, total emissions’ change and waste disposal capacity in road construction with recycled waste materials involved. With help of this evaluation indexes system, the contributions to environmental improvement caused by recycling waste materials in road construction can be quantified through calculating savings on environmental impact potentials, savings on energy consumption, on virgin materials’ consumption and waste disposal capacity provided by road construction. Based on the construction project of a road section numbered No.20 EWK0+400 ~ EWK0+600 of North highway to Shanghai Pudong international airport, which was the first trial project of using several kinds of recycled waste materials including bottom ash from incinerators to replace commonly used materials such as gravel in large scale in road pavement, the results of the four indexes, namely, savings on energy consumption and virgin materials’ consumption, environmental impact potentials as well as waste disposal capacity were obtained. It was found out that with multi recycled waste materials replacing part of the common construction material, systematical energy consumption can be reduced by 30%, a large amount of virgin resource consumption can be avoid and road construction also provides a remarkable large “dumping site” for solid wastes; while at the same time environmental impact potentials were saved for most impact categories except for increase in Ecotoxicity, water chronic, which was caused by heavy metals’ leaching and can be prevented by pre-treatment. Those results are useful for guiding the utilization of recycled waste materials, as well as for developing new technology process and advanced materials in road construction.

scholarly journals Experimental Study on Mechanical Property of Stiffening-ribbed-hollowpipe Reinforced Concrete Girderless Floor with Four Clamped Edges Supported

2013 ◽  
Vol 7 (1) ◽  
pp. 170-178 ◽  
Author(s):  
Weijun Yang ◽  
Yongda Yang ◽  
Jihua Yin ◽  
Yushuang Ni
Keyword(s):  
Mechanical Property ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Large Scale ◽  
Load Test ◽  
Static Load Test ◽  
Loading Test ◽  
Element Analysis ◽  
Clamped Edges

In order to study the basic mechanical property of cast-in-place stiffening-ribbed-hollow-pipe reinforced concrete girderless floor, and similarities and differences of the structural performance compared with traditional floor, we carried out the destructive stage loading test on the short-term load test of floor model with four clamped edges supported in large scale, and conducted the long-term static load test. Also, the thesis conducted finite element analysis in virtue of ANSYS software for solid slab floor, stiffening-ribbed-hollow-pipe floor and tubular floor. The experiment indicates that the developing process of cracks, distribution and failure mode in stiffening-ribbed-hollow-pipe floor are similar to that of solid girderless floor, and that this kind of floor has higher bearing capacity and better plastic deformation capacity. The finite element analysis manifests that, compared with solid slab floor, the deadweight of stiffening-ribbed-hollow-pipe floor decreases on greater level while deformation increases little, and that compared with tubular floor, this floor has higher rigidity. So stiffening-ribbed-hollow-pipe reinforced concrete girderless floor is particularly suitable for long-span and large-bay building structure.

scholarly journals Pavement Subgrade Stabilization with Lime and Cellular Confinement System

2018 ◽  
Vol 13 (2) ◽  
pp. 87-93
Author(s):  
Muhammet Vefa Akpinar ◽  
Erhan Burak Pancar ◽  
Eren Şengül ◽  
Hakan Aslan
Keyword(s):  
Bearing Capacity ◽  
Large Scale ◽  
Clayey Soil ◽  
Dry Weight ◽  
Hydrated Lime ◽  
Load Test ◽  
Lime Stabilization ◽  
Plate Load Test ◽  
Reaction Coefficient ◽  
Geocell Reinforcement

In this study effectiveness of lime stabilization and geocell reinforcement techniques of roads was investigated for low bearing capacity subgrades. For this purpose, a large-scale plate load test was designed and used. Clayey soil with high moisture content was reinforced with different percentages of hydrated lime (5%, 10%, 15% dry weight of the soil). The deflection and stress results indicated that lime stabilization or geocell reinforcement alone did not significantly increase subgrade reaction coefficient and bearing capacity values. Promising results were obtained on stabilization of weak subgrade when both techniques were used together. It was determined that cellular reinforcement increased the reaction modulus coefficient value and bearing capacity of the subgrade soil by more than 15% compared to the lime stabilization.

scholarly journals Study on Restoration Materials for Historical Silty Earthen Sites Based on Lime and Starch Ether

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Dequan Kong ◽  
Jianxun Chen ◽  
Rong Wan ◽  
Hongli Liu
Keyword(s):  
Large Scale ◽  
Friction Angle ◽  
Soil Samples ◽  
Archaeological Sites ◽  
Lime Content ◽  
Glutinous Rice ◽  
Ether Solution ◽  
Strength And Durability ◽  
Compression Resistance ◽  
Modified Soil

The relics built with soil are called earthen archaeological sites. Many silt earthen sites exposed to natural environment get seriously damaged and thus require urgent restoration with suitable materials. Previously, lime and glutinous rice slurry were used in the construction of earthen sites. However, lime is usually used in clay, and glutinous rice pulp is difficult to prepare and use on a large scale. Therefore, in this study, starch ether was selected to replace glutinous rice pulp. Lime and starch ether were added to silt as single or double additives, respectively, to prepare the corresponding single-mixed and multiple-mixed modified soil samples. Furthermore, the direct shear test and compression test were carried out and the optimum content was determined. The strength and durability of optimum modified materials were compared with those of the original site soil. When the lime content was 9% or the concentration of starch ether solution was 5%, the shear strength and compression resistance ability of single-mixed modified soil were improved significantly. When lime content was 6% and starch ether solution was 5%, the strength of multiple-mixed modified soil was the best, and the maximum cohesion and internal friction angle were 51.1 and 3.37% higher than those of single-mixed soil, respectively. The strength and durability of the optimum modified soil were similar to or higher than those of the site soil. Thus, it is feasible and effective to use lime together with starch ether as restoration material for silty earthen sites.

scholarly journals Assessment of the Impact of CO, NOx and PM10 on Air Quality during Road Construction and Operation Phases

2020 ◽  
Vol 12 (24) ◽  
pp. 10549
Author(s):  
Marinella Giunta
Keyword(s):  
Air Quality ◽  
Comprehensive Evaluation ◽  
Dispersion Model ◽  
Road Construction ◽  
Air Emissions ◽  
Unpaved Road ◽  
The Road ◽  
The Impact ◽  
Co Concentrations

The road sector is one of the main sources of air emissions in the atmosphere during both construction and operation. The objective of the present paper is a comprehensive evaluation of the impact on air quality during the two main phases of life cycle of roads. In this case study of a motorway project, the emissions of the primary pollutants, CO, NOx, and PM10 are estimated, and the results showed that (i) CO and NOx pollutants released during both phases are comparable, while the emissions of PM10 are more significant in the construction phase; (ii) 85% of PM10 in construction is due to storage, transit on unpaved road, and crushing; (iii) the portals of the tunnel are the sites where there are higher concentrations of pollutants in operation; and (iv) the CO concentrations estimated by the dispersion model are strongly influenced by the topography.

Wildland fire spread modelling using cellular automata: evolution in large-scale spatially heterogeneous environments under fire suppression tactics

2011 ◽  
Vol 20 (5) ◽  
pp. 633 ◽  
Author(s):  
A. Alexandridis ◽  
L. Russo ◽  
D. Vakalis ◽  
G. V. Bafas ◽  
C. I. Siettos
Keyword(s):  
Cellular Automata ◽  
Geographical Information Systems ◽  
Large Scale ◽  
Fire Suppression ◽  
Meteorological Data ◽  
Fire Spread ◽  
Geographical Information ◽  
Heterogeneous Environments ◽  
Detailed Model ◽  
Technical Specifications

We show how microscopic modelling techniques such as Cellular Automata linked with detailed geographical information systems (GIS) and meteorological data can be used to efficiently predict the evolution of fire fronts on mountainous and heterogeneous wild forest landscapes. In particular, we present a lattice-based dynamic model that includes various factors, ranging from landscape and earth statistics, attributes of vegetation and wind field data to the humidity of the fuel and the spotting transfer mechanism. We also attempt to model specific fire suppression tactics based on air tanker attacks utilising technical specifications as well as operational capabilities of the aircrafts. We use the detailed model to approximate the dynamics of a large-scale fire that broke out in a region on the west flank of the Greek National Park of Parnitha Mountain in June of 2007. The comparison between the simulation and the actual results showed that the proposed model predicts the fire-spread characteristics in an adequate manner. Finally, we discuss how such a detailed model can be exploited in order to design and develop, in a systematic way, fire risk management policies.

Seismic Performance of Improved Ground Sites during the 2010–2011 Canterbury Earthquake Sequence

2014 ◽  
Vol 30 (1) ◽  
pp. 111-129 ◽  
Author(s):  
Liam M. Wotherspoon ◽  
Rolando P. Orense ◽  
Mike Jacka ◽  
Russell A. Green ◽  
Brady R. Cox ◽  
...  
Keyword(s):  
Large Scale ◽  
Ground Improvement ◽  
Soil Improvement ◽  
Earthquake Sequence ◽  
Soil Conditions ◽  
Ground Failure ◽  
Canterbury Earthquake Sequence ◽  
Liquefaction Assessment ◽  
The City ◽  
Selection Of

The city of Christchurch and the surrounding region on the South Island of New Zealand are underlain by large areas of recent alluvial sediments and fills that are highly susceptible to liquefaction and seismic ground failure. Thus, the widespread liquefaction that occurred following the successive large-scale earth-quakes, with moment magnitudes (MW) ranging from 6.0 to 7.1 that struck the Canterbury region in 2010–2011 was expected. Prior to the series of earthquakes, soil improvement had been used at several sites to mitigate the anticipated damage. This paper reviews the performance of improved sites during the Canterbury earthquake sequence. The existing soil conditions at each site and the design of the ground improvement are discussed, together with descriptions of the post-earthquake damage observed. Moreover, liquefaction assessment within and surrounding a selection of the ground improvement zones is presented.

HydroSOS: a pilot global Hydrological Status and Outlook System integrating national to global scale hydrological services for increased resilience to hydro-climatic risks

2020 ◽  
Author(s):  
Katie Smith ◽  
Luis Roberto Silva Vara ◽  
Harry Dixon ◽  
Victoria Barlow ◽  
Alan Jenkins ◽  
...  
Keyword(s):  
Large Scale ◽  
Lake Victoria ◽  
Pilot Project ◽  
Global Scale ◽  
Lake Victoria Basin ◽  
Scale Modelling ◽  
Technical Specifications ◽  
Climatic Risks ◽  
Main Activity ◽  
Hydrological Services

<p>Consistent hydrological status and outlook information across transboundary basins or regions of shared hydrological interest are not often available. Furthermore, whilst large-scale modelling capabilities are continually improving, there is an information and confidence gap between locally informed hydrological status information products and those developed globally.</p><p>HydroSOS is World Meteorological Organisation initiative that aims to increase global resilience to hydro-climatic risks through the production of hydrological status and outlooks assessments at different scales around the world. Currently in a pilot phase, HydroSOS is being developed through a collaboration between National Hydrometeorological Services, transboundary basin organisations, global modelling centres and the research community. The system will provide an appraisal of where current hydrological status is different from “normal”, as well as sub-seasonal to seasonal outlooks indicating whether this is likely to get better or worse over the coming weeks and months.</p><p>The HydroSOS programme consists of five main activity streams:</p><ol><li>Increasing the interoperability of hydrological status and outlook products through <strong>Common Technical Specifications.</strong></li> <li>Increasing national capabilities to generate hydrological status and sub-seasonal to seasonal outlook products through <strong>Guidance on Methods and Tools.</strong></li> <li>Increasing the utility of large-scale hydrological status and outlook modelling through <strong>Co-design of Global Products</strong>, with international partners working from local to global scale.</li> <li>Increasing shared production of transboundary hydrological status and outlook products through <strong>Regional Pilots</strong>, initially in South Asia and the Lake Victoria Basin.</li> <li>Integration of hydrological status and outlook products for national, regional and global users through a <strong>Demonstration Portal.</strong></li> </ol><p>This PICO contribution will present progress in the pilot project to date, including a hands-on demonstration of the web portal.</p>

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