scholarly journals Large Scale Laboratory Investigation in the Improvement of Subgrade Characteristics of Clay Soil Stabilized with Construction Demolition Waste

2021 ◽  
Author(s):  
Baki Bagriacik ◽  
Keyword(s):  
Laboratory Investigation ◽  
Large Scale ◽  
Clay Soil ◽  
Soil Improvement ◽  
Economic Life ◽  
Stress Distributions ◽  
Curing Time ◽  
Demolition Waste ◽  
Alternative Method ◽  
Storage Facilities

Earthquakes, are a serious problem for a country where necessary measures should be taken. In this context, buildings that have completed their economic life have been demolished in recent years. A lot of construction demolition waste (CDW) occurred from the destroyed buildings. These wastes were collected in the storage facilities and took up a lot of space. So, it is vital to use these wastes both by emptying the storage facilities and reusing them without harming the nature. An alternative method for re-utilizing these wastes is soil improvement. In this context, the usability of CDW in the improvement of a clay soil was investigated. The bearing bearing ratios (BCR) and stress distributions of the clay soil were examined for different CDW ratios, different improvement depths(H / D) and different curing times. As a result, it was suggested that the optimum CDW ratio should be 14%, the improvement depth should be 1.5 and the optimum curing time should be 14 days in clay soil. The findings obtained from large-scale experiments and microstructure analyzes, it showed that CDW is a waste that can be used in soil improvement.

scholarly journals Evaluating Biosedimentation for Strength Improvement in Acidic Soil

2021 ◽  
Vol 11 (22) ◽  
pp. 10817
Author(s):  
Ahmed Hassan Saad ◽  
Haslinda Nahazanan ◽  
Zainuddin Bin Md Yusoff ◽  
Muskhazli Mustafa ◽  
Mohamed Hamdy Elseknidy ◽  
...  
Keyword(s):  
Shear Strength ◽  
Large Scale ◽  
Clay Soil ◽  
Soil Improvement ◽  
Physical Models ◽  
Marine Clay ◽  
Soil Medium ◽  
Treated Soil ◽  
The Stability ◽  
Construction Loads

Marine clay soils are problematic soils in the construction industry when they are subjected to construction loads. When these soils are loaded, they lose their structure. This leads to the soil being unable to withstand loads of any magnitude without exhibiting significant, permanent deformations. In order to stabilize the marine soil, new methods for soil improvement were built upon biogrouting by incorporating physical, biological and chemical treatments into the soil. However, the biggest challenge of this method is the bacteria migration through the soil medium. To overcome this issue, the electrokinetic phenomenon can be utilized alongside biogrouting to prevent the bacteria migration. In this regard, the present study applied electrobiogrouting stabilization to investigate the improvement of acidic marine clay soil with a pH of 3.69. To accomplish this, two large-scale physical models with dimensions of 500 × 300 × 1200 mm were fabricated to examine the influence of two different treated distances between the inlet and outlet—450 mm (D45) and 600 mm (D60)—on the stability of the treated soil. It was observed that the shear strength of the treated soil improved significantly. The shear strength at the D45 treated distance increased from 3.65 kPa (untreated soil) to 28.14 kPa (treated soil). However, the strength increased by increasing the treated distance. In addition, compressibility and soil electrical conductivity were reduced significantly, and the Atterberg limits were significantly enhanced from OH to OL. The reasons for the enhancement of treated soil were the formation of CaCO3, which filled the soil voids, and that the water content was reduced. To address issues with marine clay soil, this study aims to minimize the high cost of a special foundation system and the use of non-environmentally friendly materials such as calcium-based binders, aside from the reduction of deformations caused by loading. The findings of this study can be used for acidic soils and the improvement of soil’s geotechnical behavior in general.

scholarly journals ANALYZED SOIL IMPROVEMENT BASED GYPSUM AND CEMENT IN SOIL CLAY

2020 ◽  
Vol 7 (12) ◽  
pp. 12-19
Author(s):  
Nuril Mahda Rangkuti
Keyword(s):  
Physical Properties ◽  
Carrying Capacity ◽  
Clay Soil ◽  
Soil Improvement ◽  
Soil Samples ◽  
California Bearing Ratio ◽  
Curing Time ◽  
Sample Testing ◽  
Soil Clay ◽  
Physical Changes

Land is an important element of the structure underneath a construction, so that the soil must have a good carrying capacity. But the reality on the ground is that many soils have low carrying capacity, so it is necessary to stabilize the soil with gypsum and cement. This study aims to determine the effective percentage of gypsum and cement addition and the effect of the addition of Gypsum and Cement to physical changes in clay soil in terms of the CBR (California Bearing Ratio) value of the curing time. This research was conducted in the laboratory, by testing the physical properties of the soil and the carrying capacity of the soil (CBR) with variations in the addition of gypsum and cement by 1%, 3%, and 5% with a long curing time of 1, 7, and 14 days . Sample testing is carried out with two treatments, namely soil samples are first cured and then compacted and the sample is solidified first and then cured. From the research results obtained the largest CBR (California Bearing Ratio) value occurs in the variation of the addition of Gypsum and Cement 5% with the length of time for soil specimens to be compacted first before curing is equal to 41.54%, this is due to the mixture of soil with gypsum and cement has been manjai solid before the collection can occur, the cavities between soil particles also become solid, so that the strength also increases. From the California Bearing Ratio results, it can be seen that the addition of gypsum and cement to clay soil shows an increase in the value of California Bearing Ratio on clay.

Large scale field tests on geogrid-reinforced granular fill underlain by clay soil

2013 ◽  
Vol 38 ◽  
pp. 1-15 ◽  
Author(s):  
Ahmet Demir ◽  
Mustafa Laman ◽  
Abdulazim Yildiz ◽  
Murat Ornek
Keyword(s):  
Large Scale ◽  
Clay Soil ◽  
Field Tests ◽  
Scale Field ◽  
Granular Fill ◽  
Large Scale Field

Experimental Research on the Engineering Properties of Foam-Improved Red Clay Soil

2011 ◽  
Vol 261-263 ◽  
pp. 1831-1835
Author(s):  
Guo Gang Qiao ◽  
Da Jun Yuan ◽  
Bo Liu
Keyword(s):  
Experimental Research ◽  
Clay Soil ◽  
Soil Improvement ◽  
Engineering Properties ◽  
Screw Conveyor ◽  
Test Results ◽  
X Ray Diffraction ◽  
Shield Tunneling ◽  
Red Clay ◽  
Improvement Measures

Red clay soil is widely distributed in south China, the microstructure of red clay soil was studied applying scanning electron microscopy (SEM), and the X-ray diffraction analysis (XRD) test found that a large number of swelling inducing minerals, for example, montmorillonite, illite-montmorillonite or chlorite-smectite were contained in the red clay soil. Shield tunneling in this kind of stratum is prone to arising “cake” and “arch” phenomena and it prone to lead screw conveyor device unsmooth dumping, so soil improvement measures must be taken. Foam as the most advanced soil conditioner has been widely used in shield construction. Using self-developed foam agent, experimental research on foam conditioning red clay soil was carried out, test results show that foam can not only significantly reduce the soil shear strength, but also can greatly enhance the soil's compressibility and fluidity, which is significant for the smooth dumping and excavation face stability maintenance.

scholarly journals Indicators of economic risks in the indicator system of the Russian financial market: dynamics and role in ensuring the country’s economic security

2020 ◽  
Vol 13 (2) ◽  
pp. 69-78
Author(s):  
T. I. Demidenko ◽  
Yu. S. Zharkova ◽  
E. I. Brichka
Keyword(s):  
Financial Market ◽  
Large Scale ◽  
Indicator System ◽  
Economic Security ◽  
Economic Life ◽  
Theoretical Level ◽  
Modeling Analysis ◽  
Analysis And Synthesis ◽  
Economic Risks

The need to ensure economic security in the context of globalization is based on the stable and safe development of all spheres of society. The financial market is the most large–scale and vulnerable area of the economic life of society, in this regard, it is relevant to study the threats affecting the activities of entities in the financial market, namely the role of economic risks in the financial market as an element of ensuring the country’s economic security. The methodological instruments of the work is based on the use of general methods of scientific knowledge, used both at the empirical and theoretical level: comparison, abstraction, modeling, analysis and synthesis. The article analyzes the risk factors of the Russian financial market since 2014, which allowed us to draw conclusions and formulate possible measures to reduce risks in the financial market that can expand the country’s economic security.

scholarly journals Decommissioning Radioactive Waste Storage Facilities of FSUE RosRAO’s Murmansk Department Branch in the North-Western Territorial District

2020 ◽  
Vol 11 (2) ◽  
pp. 17-24
Author(s):  
D. N. Vlasov ◽  
◽  
D. N. Zamaskin ◽  
O. O. Kaminsky ◽  
A. V. Kamorny ◽  
...  
Keyword(s):  
Radioactive Waste ◽  
Nuclear Power ◽  
Large Scale ◽  
Technical Equipment ◽  
Special Equipment ◽  
Engineering Structures ◽  
The North ◽  
Waste Storage ◽  
Radioactive Waste Storage ◽  
Storage Facilities

The article discusses one of today’s challenges, namely, the decommissioning of nuclear power facilities. It summarizes the experience in the decommissioning of radioactive waste storage facilities belonging to RosRAO’s Murmansk department branch of the Northwest Territorial District providing detailed overview of pre-decommissioning activities, as well as the decommissioning operations themselves, relevant technology and technical equipment applied. Pre-decommissioning stage involved large-scale efforts (2011—2015) on accumulated RW identifi cation and its inventory taking, as well as a comprehensive engineering radiation survey. Decommissioning projects have been developed and approved, a state environmental examination has been carried out with a Sanitary and Epidemiological Statement on compliance with state sanitary and epidemiological rules and regulations issued by FMBA of Russia. The paper presents the practice of constructing some engineering structures to provide additional safety and security of RW storage facilities during their dismantlement. Particular attention was paid to the problems associated with the use of special equipment.

Stress Distributions in Nonsymmetric Rotating Rays

1955 ◽  
Vol 22 (3) ◽  
pp. 311-316
Author(s):  
P. G. Hodge
Keyword(s):  
Plastic Deformation ◽  
Stress Distribution ◽  
Large Scale ◽  
Bending Moment ◽  
Rotating Disk ◽  
Longitudinal Force ◽  
Maximum Speed ◽  
Stress Distributions ◽  
Centrifugal Forces

Abstract The centrifugal forces acting upon a rotating ray will produce longitudinal stresses along the ray. If the ray is not symmetric, these stresses will result not only in a longitudinal force, but also in a bending moment. A technique for finding the stress distribution in this case is developed and illustrated by means of simple examples. The limiting elastic speed and the maximum speed before large-scale plastic deformation commences are computed. An indication is given of how similar methods may be used to analyze a rotating disk with no plane of symmetry perpendicular to the axis.

Prediction of large-scale demolition waste generation during urban renewal: A hybrid trilogy method

2019 ◽  
Vol 89 ◽  
pp. 1-9 ◽  
Author(s):  
Bo Yu ◽  
Jiayuan Wang ◽  
Jie Li ◽  
Jingrong Zhang ◽  
Yani Lai ◽  
...  
Keyword(s):  
Urban Renewal ◽  
Large Scale ◽  
Waste Generation ◽  
Demolition Waste
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