Use of Geofoam for Road Construction over Very Soft Clay

2021 ◽  
pp. 189-199
Author(s):  
Subhatosh Pramanik ◽  
Amit Kumar Das ◽  
Ashim Kanti Dey
Keyword(s):  
Soft Clay ◽  
Road Construction

scholarly journals Performance of soft clay stabilized with sand columns treated by silica fume

2018 ◽  
Vol 162 ◽  
pp. 01007
Author(s):  
Zeena Samueel ◽  
Hussein Karim ◽  
Mohammed Mohammed
Keyword(s):  
Silica Fume ◽  
Carrying Capacity ◽  
Construction Projects ◽  
Ground Improvement ◽  
Soft Clay ◽  
Road Construction ◽  
Reduction Ratio ◽  
Area Replacement Ratio ◽  
Second Category ◽  
Improvement Ratio

In many road construction projects, if weak soil exists, then uncontrollable settlement and critical load carrying capacity are major difficult problems to the safety and serviceability of roads in these areas. Thus ground improvement is essential to achieve the required level of performance. The paper presents results of the tests of four categories. First category was performed on saturated soft bed of clay without any treatment, the second category shed light on the improvement achieved in loading carrying capacity and settlement as a result of reinforcing with conventional sand columns at area replacement ratio = 0.196. The third set investigates the bed reinforced by sand columns stabilized with dry silica fume at different percentages (3, 5 and 7%) and the fourth set investigates the behavior of sand columns treated with slurry silica fume at two percentages (10 and 12%). All sand columns models were constructed at (R.D= 60%). Model tests were performed on bed of saturated soil prepared at undrained shear strength between 16-20 kPa for all models. For all cases, the model test was loaded gradually by stress increments up to failure. Stress deformation measurements are recorded and analyzed in terms of bearing improvement ratio and settlement reduction ratio. Optimum results were indicated from soil treated with sand columns stabilized with 7% dry silica fume at medium state reflecting the highest bearing improvement ratio (3.04) and the settlement reduction ratio (0.09) after 7 days curing. While soil treated with sand columns stabilized with 10% slurry silica fume provided higher bearing improvement ratio 3.13 with lower settlement reduction ratio of 0.57 after 7-days curing.

Analysis of Lightweight Concrete “Cakar Ayam” Foundation for Road Construction using Plaxis 3D Foundation Software

2014 ◽  
Vol 695 ◽  
pp. 729-733 ◽  
Author(s):  
Ahmad Hakimi Mat Nor ◽  
Aklil Hamdee Yahuda ◽  
Faizal Pakir
Keyword(s):  
Lightweight Concrete ◽  
Load Capacity ◽  
Soft Soil ◽  
Soft Clay ◽  
Road Construction ◽  
Soil Parameters ◽  
Slab Thickness ◽  
Foundation Design ◽  
Clayey Silt ◽  
Plaxis 3D

Road settlement often occurs because that soil cannot accommodate the load capacity. Therefore, the study to analysis of lightweight concrete “cakar ayam” foundation was conducted. The idea of “cakar Ayam” concept was introduced by Prof. Dr. Ir. Sediyatmo. Objective of these studies was achieved which is to determine the settlement value of lightweight concrete “Cakar Ayam” foundation design on soft clay, sand, clayey silt under the different loads. Hence, the effectiveness of lightweight concrete “cakar ayam” foundation on that soil, have been able to determined according the settlement value was obtained. Implementation of research was doing using Plaxis 3D foundation software. The foundation design was various according to the several of the column length. The slab thickness, spacing between column, foundation and column size was fixed. Soil parameters to analyse lightweight concrete “cakar ayam” foundation, was obtained from previous studies and Research Center of Soft Soil, Universiti Tun Hussien Onn Malaysia, (RECESS, UTHM). Each design was tested by different loads to get the settlement value. From the results show, the settlements value was obtained show concept of “cakar ayam” foundation, not effective to be implement on soft clay. The settlement value was over 25 mm, when the load 20 kN/m2 was applied on the foundation, to all length of column on soft clay. However, the settlement value was lower than 25 mm, when the load 40 kN/m2 was applied on the foundation, to all length of column on sand and clayey silt. From all the settlement value, it could be seen that clayey silt result was more effective than sand. The settlement value also was decrease when the length of pile was increase. In conclusion, the objective of the study was achieved.

scholarly journals Stabilization of Soft Clay by Using Diapers Back Sheet Layer Wastes

2018 ◽  
Vol 250 ◽  
pp. 01015
Author(s):  
Ahmad Hakimi Mat Nor ◽  
Faizal Pakir ◽  
Muhammad Arif Azraei Izzudin ◽  
Salman Salim ◽  
Mohd Erwan Sanik ◽  
...  
Keyword(s):  
Soil Stabilization ◽  
Soft Clay ◽  
Road Construction ◽  
Building Structure ◽  
Optimum Size ◽  
Research Focus ◽  
Untreated Soil ◽  
Cbr Test ◽  
Strength And Deformation ◽  
Recycled Material

This research focus on improving the weaknesses of soft clay soils by using proper recycled material as a stabilization agent for strengthening purpose. Therefore, Diaper’s Back Sheet Layer Wastes (DBSLW) were used as the agent of soil stabilization. In this study, series of laboratory test were conducted to evaluate the optimum size and content of DBSLW as a strip reinforcement to increase the strength of Batu Pahat Soft Clay (BPSC). Testing program involves obtaining the physical properties of BPSC followed by California Bearing Ratio (CBR) test to determine the strength of BPSC with and without the addition of DBSLW. Result shows that the optimum size for DBSLW is 10 mm x 30 mm while the optimum content is 0.5%. At 15 mm penetration, sample with diapers strip of 10 mm x 30 mm dimension record 4.10 kN CBR value compare to 1.64 kN CBR value of untreated soil, 2.5 times stronger than untreated soil. Results of CBR tests demonstrated that inclusion of DBSLW strips in soil with optimum amounts and size improved strength and deformation behavior of soils substantially. The proposed technique could be used to advantage in road construction, industrial yards, and building structure.

scholarly journals Stabilization of soft clayey soils with sawdust ashes

2018 ◽  
Vol 162 ◽  
pp. 01006
Author(s):  
Hussein Karim ◽  
Makki Al-Recaby ◽  
Maha Nsaif
Keyword(s):  
Clayey Soil ◽  
Soft Clay ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Dry Weight ◽  
Liquid Limit ◽  
Clay Soils ◽  
Dry Density ◽  
Clayey Soils ◽  
Maximum Dry Density

The problems of soft clayey soils are taken in considerations by many Iraqi geologists and civil engineers, because about 35% of the Iraqi clay soils (especially southern Iraq) are weak. Thus, it is necessary to improve the properties of such soils for road construction by means of using of various stabilizers such as sawdust ash. The main goal of the present study is to stabilize soft clay models with sawdust ash (SDA) additive using different percentages (0, 2, 4, 6, 8 and 10% by dry weight of soil). The results revealed that the additive has adverse effects on the property of soil indices by increasing its liquid limit and plasticity index due to clay content. The mixture of sawdust ashes with soft clay soils improves most other physical and mechanical properties of the soil, as expressed by a general reduction in specific gravity and maximum dry density (MDD), as well as a reduction in the compression coefficients (Cc and Cr) with an increase in SDA content. While increasing the optimum moisture content (OMC) and the undrained shear strength (cu) with the increase in SDA content. The stabilized soils (with 4 and 10% ash content) resulted in low CBR values (1.6-1.2%) which can be used as sub-base. The SDA can be considered as a cheap and acceptable stabilizing agent in road construction for improving most of the geotechnical properties of the soft clayey soil.

On Mechanisms of Realization of the Public Procurement of Construction Works (The Case of Road Const ruction)

2003 ◽  
pp. 68-80
Author(s):  
A. Dementiev ◽  
A. Zolotareva ◽  
A. Reus
Keyword(s):  
Public Procurement ◽  
Road Construction ◽  
International Experience ◽  
The Public ◽  
Government Purchases ◽  
Efficiency And Effectiveness ◽  
Construction Works ◽  
Budget Expenditure

The most important measures stimulating the increase of efficiency and effectiveness of budget expenditures on road construction are the improvement of pricing mechanisms and increasing efficiency of the procedures of government purchases of goods, works and services. The paper includes the analysis of main problems that arise in the process of government purchases and construction pricing with the reference to budget expenditure on road construction. It includes the review and analysis of international experience and possible measures of increasing the efficiency and effectiveness of government purchases and (road) construction pricing in Russia.

The Political Economy of Power: Approaches to the Analysis of Relationships between the State and Business in Russia

2011 ◽  
pp. 19-33
Author(s):  
A. Oleinik
Keyword(s):  
Oil And Gas ◽  
Road Construction ◽  
Oil And Gas Industry ◽  
Retail Trade ◽  
Business Community ◽  
The Political ◽  
Economic Power ◽  
Gas Industry ◽  
The Road ◽  
Ruling Elites

The article deals with the issues of political and economic power as well as their constellation on the market. The theory of public choice and the theory of public contract are confronted with an approach centered on the power triad. If structured in the power triad, interactions among states representatives, businesses with structural advantages and businesses without structural advantages allow capturing administrative rents. The political power of the ruling elites coexists with economic power of certain members of the business community. The situation in the oil and gas industry, the retail trade and the road construction and operation industry in Russia illustrates key moments in the proposed analysis.

French Military Engineers in the American Colonies, 1635–1776

2018 ◽  
Author(s):  
Emilie d’Orgeix
Keyword(s):  
Road Construction ◽  
Town Planning ◽  
French Antilles ◽  
Saint Domingue ◽  
American Colonies ◽  
French Military ◽  
Land Surveying

The first French military engineers in the American colonies between 1635 and 1670 did not belong to a professional corps, being officers with expertise to do military land-surveying and construct emergency defences. Between 1670 and 1691 engineers were under the discipline of Vauban who chose them for missions in Canada or the French Antilles. After 1691, until 1776, they were all ingénieurs du roi. They ranged across citadel and fort construction, cartography and town planning (especially in Louisiana and Saint Domingue).They promoted the urban grid plan, as well as harbours and road construction. With incorporation in a royal Genie corps in 1776 they became much more strictly military.

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