scholarly journals Analysis and Assessment of the Usefulness of Recycled Plastic Materials for the Production of Airfield Geocell

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3557
Author(s):  
Mariusz Wesołowski ◽  
Piotr Włodarski ◽  
Paweł Iwanowski ◽  
Agata Kowalewska
Keyword(s):  
Bearing Capacity ◽  
Optimal Solution ◽  
Field Tests ◽  
Field Studies ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Plastic Materials ◽  
Load Carrying ◽  
Long Time ◽  
Recycled Plastics

The load-bearing capacity of natural airfield pavement has a direct impact on the safety of air operations. Unfortunately, the field tests often indicate that the load-bearing capacity of natural airfield pavements is not sufficient. In this case, it is necessary to reinforce them in order to meet the requirements set out in international documents. It is important that the method of reinforcing the subsoil is fast and as noninvasively as possible. There are many methods of reinforcing the subsoil, however, they are expensive and time-demanding, which involves turning off the airport for a long time. Airfield geocells made of recycled plastics discussed in the article seem to be the optimal solution due to the quick implementation of their application by pressing into the existing natural pavement. The article presents the results of laboratory tests demonstrating that material in question is load-resistant and chemical-resistant, while field studies have confirmed that the airfield geocell made of the plastic in question improves the load carrying capacity of natural airfield pavement.

scholarly journals A concrete prefabricated slab as a technology for reconstructing damaged, local air-field pavements

2018 ◽  
Vol 2018 (12) ◽  
pp. 51-64
Author(s):  
Mariusz Wesołowski ◽  
Bartosz Świerzewski
Keyword(s):  
Bearing Capacity ◽  
Field Tests ◽  
Working Life ◽  
Concrete Slabs ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
The Real ◽  
International Airport ◽  
Fast Reconstruction

The age of currently operated concrete airfield pavements in Poland exceeds 30 years opera-tion period many times. Such a long working life of airfield pavements forced to search for the efficient and fast technologies of their reconstruction. The article described in detail the technologies of fast reconstruction of airfield concrete slabs using prefabricated slabs. The addressed technology guarantees the reconstruction and even the improvement of the condi-tion of load-bearing capacity of mentioned airfield slabs which was confirmed during labora-tory tests, field tests and practically verified in the real operation in the International Airport Kraków-Balice.

scholarly journals Influence of Ferrofluid Lubrication on Longitudinally Rough Truncated Conical Plates with Slip Velocity

2019 ◽  
Vol 7 (2) ◽  
pp. 93-101
Author(s):  
M M Munshi ◽  
A R Patel ◽  
G M Deheri
Keyword(s):  
Surface Roughness ◽  
Bearing Capacity ◽  
Slip Velocity ◽  
Performance Enhancement ◽  
Positive Impact ◽  
Squeeze Film ◽  
Bottom Plate ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Load Carrying

The study focuses on analyzing the effect of slip velocity in the case of a Ferrofluid squeeze film when the surface of truncated cone-shaped plates has a longitudinal roughness. Each oblique to the bottom plate was utilized by the external magnetic field. The bearing surface has a roughness that is designed with the help of a random stochastic variable having a nonzero mean, skewness and variance. The load carrying ability of a bearing system’s surface is determined by calculating the dispersal of pressure in the system, which is calculated by using the associated stochastically average Reynolds’ equation. The graphs obtained from the study shows that there is a correlation between the longitudinal surface roughness and the bearing system performance. The magnetic fluid lubrication has a positive impact on a system’s bearing capacity. However, the load bearing capacity declines as a result of the effect of slip. A high negative skewness of the surface roughness also has a positive impact on a bearing’s load carrying capacity. One interesting finding shows that contrasting to the results of transverse roughness, standard deviation positively impacts the load bearing capacity. This investigation suggests despite the im-portance of aspect ratio and semi vertical angle is significant for performance enhancement, it is also essential to maintain the slip at the lowest level.

scholarly journals Engineering diagnostics of shaft lining in Gubkin Mine

2020 ◽  
pp. 64-67
Author(s):  
S. V. Sergeev ◽  
◽  
E. D. Vorobiev ◽  
I. M. Ignatenko ◽  
A. V. Zinchenko ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Field Studies ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Mine Dumps ◽  
Design Values ◽  
Engineering Diagnostics ◽  
Shaft Lining ◽  
Compression Resistance

Shafts in Gubkin Mine, KMAruda have been in operation since the late 1940s. The shafts are sunk in difficult hydrogeological conditions. At the present time, due to transition to deeper levels, deeper mine dumps are required. It is necessary to reinforce shaft lining in watered rocks. During long-term service of shaft 1, due to corrosion, thickness of liner plates and horizontal ribs has decreased by 1.5–2 and 3–5 mm, respectively (two-side corrosion). As a result, the load-bearing capacity of the tubbing has lowered by 5–7%. At the same time, the actual stresses are not higher than 22 MPa, which is 10 times less than the design compression resistance of gray cast iron as per Construction Code SP 16.13330.2017. Field studies have been performed in Gubkin Mine toward improvement of operating safety of shafts during mineral mining at deeper levels. Stress state diagnostics of lining in shaft 1 shows that the lining preserves its load-bearing capacity in all types of rocks. Thus, safe operation can be continued without extra expenses connected with the lining reinforcement. The field studies in the cage shaft show that pressure on the lining in frozen rocks is 1.5–2 times higher than the design values. It is recommended to continue the studies to estimate effects of possible rock displacements on the lining during further mining.

scholarly journals Reconstructing the Load-Bearing Capacity of Deteriorated, Concrete Airfield Pavements Using Prefabricated Slabs

2018 ◽  
Vol 41 (1) ◽  
pp. 31-61
Author(s):  
Mariusz Wesołowski ◽  
Agata Kowalewska ◽  
Bartosz Świerzewski
Keyword(s):  
Bearing Capacity ◽  
Laboratory Tests ◽  
Field Tests ◽  
Working Life ◽  
Concrete Slabs ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Operation Period ◽  
Fast Reconstruction ◽  
Loadbearing Capacity

Abstract The age of currently operated concrete airfield pavements in Poland exceeds 30 years operation period many times. Such a long working life of airfield pavements forced to search for the efficient and fast technologies of their reconstruction. The article described in detail the technologies of fast reconstruction of airfield concrete slabs using prefabricated slabs. The addressed technology guarantees the reconstruction and even the improvement of the condition of loadbearing capacity of mentioned airfield slabs which was confirmed during laboratory tests, field tests and practically verified in the real operation in the International Airport Kraków-Balice.

scholarly journals Analysis of the possibility of using a geogrid to improve load bearing capacity of natural airfield pavements

2021 ◽  
Vol 51 (3) ◽  
pp. 135-148
Author(s):  
Agata Kowalewska ◽  
Piotr Włodarski ◽  
Paweł Pietruszewski
Keyword(s):  
Bearing Capacity ◽  
Safety System ◽  
Flight Safety ◽  
Military Aircraft ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Innovative Method ◽  
Long Time

Abstract The article presents an innovative method that was verified in the field. It is aimed to improve the load bearing capacity of airfield pavements, which are one of the elements of the flight safety system. Airfield pavements protect the runway in case when the aircraft is taxiing beyond the runway. Moreover, they are also used to perform starting and landing operations of military aircraft. Due to this, they need to have an adequate load bearing capacity that ensures the safety of performing aircraft flights. Airports cannot afford to be shut down for a long time; thus, it is essential to look for efficient and fast solutions that could improve the load bearing capacity of airfield pavements. The authors suggested to apply geogrid immersed in natural airfield pavement.

scholarly journals DEVELOPMENT OF A METHOD FOR CALCULATING THE BEARING CAPACITY OF BORED CONICAL PILES

2021 ◽  
Vol 6 (9) ◽  
pp. 28-36
Author(s):  
I. Rybnikova ◽  
A. Rybnikov
Keyword(s):  
Bearing Capacity ◽  
Field Tests ◽  
Side Surface ◽  
Strength Properties ◽  
Empirical Method ◽  
Full Scale ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Static Tests ◽  
Ground Resistance

Three methods for determining the load-bearing capacity of bored conical piles are presented, considering the additional forces of the ground rebound along their inclined side surface under vertical load. It is proposed to determine the bearing capacity according to the results of field tests using the coefficient of transition from the maximum permissible settlement of the building foundation to the settlement of the pile obtained during static tests. Its value varies from 0.1 to 0.3 depending on the angle of the pile taper. To determine the bearing capacity of the empirical method, tabular data of the ground rebound forces on the side surface of the piles are developed. It depends on the strength properties of the base soil, the angle of the pile taper and the depth of the location of the changing cross-section of the pile along the length. The process of compressing the soil in a drilled well with an elastic cylindrical pressiometer is close to the occurrence of a ground rebound when it is pushed apart by the side surface of a conical pile during sediment under load. It is proposed to determine the ground resistance on the side surface of conical piles according to the same dependence as when processing the results of pressiometric tests of soils, taking into account the introduction of a correction factor depending on the parameters of the pile. The calculated load-bearing capacity of the piles, determined by the proposed methods, differs from the actual load-bearing capacity, determined by the results of static tests of full-scale piles, within 10 %. However, these methods need to be improved with the accumulation of statistical data for testing full-scale piles in different ground conditions.

Analysis of Bored Piles' Field Test Results

2019 ◽  
Vol 828 ◽  
pp. 194-201
Author(s):  
Lidia Kondratieva ◽  
Vladimir Konyushkov ◽  
Le Van Trong ◽  
Vladimir Kirillov
Keyword(s):  
Bearing Capacity ◽  
Deformation Modulus ◽  
Field Tests ◽  
Side Surface ◽  
Geometrical Parameters ◽  
Foundation Design ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Geological Conditions ◽  
Bored Piles

The purpose of the study is to establish accuracy of determining the load-bearing capacity of bored piles according to the method specified in Regulations 24.13330.2011 "Pile foundations". Relevance of the topic is determined by the following: the load-bearing capacity of a pile is a fundamental indicator affecting all subsequent activities related to foundation design, and accuracy of analytical solutions for complex engineering and geological conditions is highly questionable. Field tests of bored piles were carried out in engineering and geological conditions of Saint Petersburg with deformation modulus from 10 to 40 MPa at a load in the range from 1,000 to 6,300 kN, at achievement of absolute settlement of 40 mm. Piles with a diameter from 0.15 to 0.88 m and a length from 10 to 47 m were made using various technologies: using casing, using slurry, using a flight auger. Following the results of field tests, diagrams of load-bearing capacity of piles according to the material, depending on geometrical parameters and manufacturing techniques, diagrams of actual and designed load-bearing capacity of piles were plotted. Approximating functions to describe the dependences were obtained. According to the analysis of the results, it is possible to conclude that the load-bearing capacity of the bored pile during field tests is 1.4–1.7 times higher than the load-bearing capacity of the pile designed according to Regulations 24.13330.2011; the average share of the load-bearing capacity along the side surface of the pile was 65% and under the pile toe — 35%.

scholarly journals Physical Tests of Alternative Connections of Different High Roof Purlins Regarding Upward Loading

Buildings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 512
Author(s):  
Miroslav Rosmanit ◽  
Přemysl Pařenica ◽  
Oldřich Sucharda ◽  
Petr Lehner
Keyword(s):  
Bearing Capacity ◽  
Load Capacity ◽  
Load Bearing Capacity ◽  
Physical Test ◽  
Load Bearing ◽  
Thin Walled Structures ◽  
Load Carrying ◽  
Physical Tests ◽  
Thin Walled ◽  
The Individual

Thin-walled cold-rolled sections are used in the construction industry, especially in the roofing of large-span halls. The load-bearing capacity of a thin-walled structure depends to a large extent on the load-bearing capacity of the details at the point of attachment to the structure and the interconnection of the individual thin-walled elements. Therefore, in the case of thin-walled structures, it is necessary to use additional structural elements such as local reinforcement, stabilising elements, supports, and other structural measures such as the doubling of profiles. This paper focused on the behaviour of tall Z300 and Z350 mm thin-walled trusses at the connection to the superstructure regarding upward loading (e.g., wind suction and so on). Two section thicknesses, 1.89 mm and 2.85 mm, were experimentally analysed. Furthermore, two types of connections were prepared, more precisely without and with a reinforced buckle. The experiments aimed to investigate the behaviour and load-carrying capacity of the detail of the roof truss connections to the supporting structure. The resulting load capacity values were compared with normative approaches. Analyses of the details of the bolt in the connection are also presented. The paper presents a practical evaluation of the physical test on real structural members.

scholarly journals RECONSTRUCTING AIRPORT PAVEMENTS USING THE TECHNOLOGY OF PREFABRICATED CONCRETE SLAB

2020 ◽  
Vol 12 (3) ◽  
pp. 111-123
Author(s):  
BARTOSZ ŚWIERZEWSKI
Keyword(s):  
Bearing Capacity ◽  
Concrete Slab ◽  
Field Tests ◽  
Functional Element ◽  
Safety Performance ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Airport Pavement

This article presents the construction and technical concept for the use of an innovative repair of the airport pavement. It consists in embedding a prefabricated concrete slab in place of the excessively degraded surface of the existing slabs. In addition, the introduced technology of connecting adjacent panels together increases the spatial stiffness of the entire functional element and significantly increases the load-bearing capacity of the pavement. The results of laboratory and field tests presented in the article confirm the effectiveness of the technology used. As a result, the application of the reconstructing technology ensures the safety performance of aircraft operations at airports facilities.

Increased load bearing capacity of mechanically joined FRP/metal joints using a pin structured auxiliary joining element

2020 ◽  
Vol 62 (1) ◽  
pp. 55-60
Author(s):  
Per Heyser ◽  
Vadim Sartisson ◽  
Gerson Meschut ◽  
Marcel Droß ◽  
Klaus Dröder
Keyword(s):  
Bearing Capacity ◽  
Load Bearing Capacity ◽  
Load Bearing
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