scholarly journals Evaluation Of The Residual Load-Bearing Capacity Of The Existing Road Using Plate Loading Test

2021 ◽  
Vol 1202 (1) ◽  
pp. 012012
Author(s):  
Endijs Virsis ◽  
Ainars Paeglitis ◽  
Atis Zarins
Keyword(s):  
Bearing Capacity ◽  
Evaluation Criteria ◽  
Road Construction ◽  
Loading Test ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Plate Test ◽  
The Road ◽  
Road Pavement ◽  
Road Design

Abstract In the last few years as the road construction budget has been decreasing in Latvia, the number of road construction reinforcement design and construction objects has been increasing. At the beginning of the project development of the existing road condition is assessed, taking into account various pavement evaluation criteria and it is determined on which road sections it is possible to reinforce the pavement and where full construction is required. The road pavement structure in Latvia is developed using “Recommendations for road design. Pavement” and inaccurately defining the bearing capacity of the existing foundation can significantly affect the service life of the designed structure. During the construction of the road, establishing that the bearing capacity of the existing foundation is lower than specified in the project incurs additional costs for the customer. Project changes are made, and special solutions are provided in order to achieve the bearing capacity on the mineral material layers defined in the project. One of the most accurate ways to determine the bearing capacity of existing road structural layers is the static plate test. However, the results of this test are also not 100% accurate and any of them may give unreasonable results due to various influencing factors. The aim of this work is to analyze the results of static plate test by determining the most important factors that affect the obtained load-bearing capacity values, identify biased/erroneous test results, and determine which results reflect the residual load-bearing capacity of the existing road structure.

scholarly journals Investigation of effect of water content on railway granular supplementary layers

2021 ◽  
pp. 64-68
Author(s):  
S Fischer
Keyword(s):  
Bearing Capacity ◽  
Water Content ◽  
Road Construction ◽  
High Water ◽  
Shear Resistance ◽  
The Other ◽  
High Water Content ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Rock Mining

Purpose. To determine the relationship between water content of continuously graded granular supplementary layers for railway substructure and their inner shear resistance and load bearing capacity. Methodology. Four different samples were produced as standard granular products from andesite. Two of them are common base courses for road construction in Hungary, the other two are common railway supplementary layers. The author performed laboratory measurements (multi-level shear box tests) that are adequate for the evaluation of inner shear resistance. The measurements of load bearing capacity and Proctor tests were executed in the laboratory of Colas Hungaria Ltd. The author performed measurements with the optimal water content values of each sample, as well as lower and higher values than them. This can show how the given granular material is sensible to the change of water content. Findings. It was proved that the granular supplementary layers, which are standardized products in road construction (as base courses), also seems to be adequate in railway construction; they are not so sensible to the variation of their water content. It does not mean that the other two granular layers are not adequate for railway substructures, but the application of road products have to be considered as substitute products. Originality. The author tried to emphasize the adequacy of rock mining for construction of ballasted railway tracks, as well as the optimal use of mineral wealth in every country with its results. Practical value. The obtained results of the present paper can be useful in the area of rock mining, and railway infrastructure engineering. During construction procedures the optimal water content values should be taken into considerations for compaction to be able to reach maximal compactness (density), but too high water content has to be avoided, which is based on the results. They can be also considered in the design phase.

scholarly journals Degradation of Axial Ultimate Load-Bearing Capacity of Circular Thin-Walled Concrete-Filled Steel Tubular Stub Columns after Corrosion

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 795 ◽  
Author(s):  
Fengjie Zhang ◽  
Junwu Xia ◽  
Guo Li ◽  
Zhen Guo ◽  
Hongfei Chang ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Ultimate Load ◽  
Steel Tube ◽  
Parameter Analysis ◽  
Loading Test ◽  
Steel Tubes ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Thin Walled ◽  
Stub Columns

This work aimed to investigate the effects of steel tube corrosion on the axial ultimate load-bearing capacity (AULC) of circular thin-walled concrete-filled steel tubular (CFST) members. Circular thin-walled CFST stub column specimens were made of steel tubes with various wall-thicknesses. These CFST column specimens were subjected to an accelerated corrosion test, where the steel tubes were corroded to different degrees of corrosion. Then, these CFST specimens with corroded steel tubes experienced an axial static loading test. Results show that the failure patterns of circular thin-walled CFST stub columns with corroded steel tubes are different from those of the counterpart CFST columns with ordinary wall-thickness steel tubes, which is a typical failure mode of shear bulging with slight local outward buckling. The ultimate strength and plastic deformation capacity of the CFST specimens decreased with the increasing degree of steel corrosion. The failure modes of the specimens still belonged to ductile failure because of the confinement of outer steel tube. The degree of steel tube corrosion, diameter-to-thickness ratio, and confinement coefficient had substantial influences on the AULC and the ultimate compressive strength of circular thin-walled CFST stub columns. A simple AULC prediction model for corroded circular thin-walled CFST stub columns was presented through the regression of the experimental data and parameter analysis.

scholarly journals STRUCTURAL ASSESSMENT OF THE BRIDGE № M 044 AT THE END OF RYBNIČNÁ STREET ABOVE THE ROAD II/502 BRATISLAVA-PEZINOK

2021 ◽  
pp. 39-48
Author(s):  
P. Paulik ◽  
◽  
O. Chernieva ◽  
Keyword(s):  
Bearing Capacity ◽  
Slovak Republic ◽  
Concrete Structures ◽  
Technical Condition ◽  
Structural Element ◽  
Load Bearing Capacity ◽  
Immediate Reconstruction ◽  
Load Bearing ◽  
The Road ◽  
Increased Risk

Abstract. The paper is focused on the results of the survey and diagnostics of the bridge № M 044 at the end of Rybničná street above the road II/502 Bratislava-Pezinok in the Slovak Republic. The article is the result of the cooperation between the Department of Concrete Structures and Bridges of the Slovak Technical University in Bratislava and the Department of Reinforced Concrete Structures and Transport Facilities of the Odessa State Academy of Civil Engineering and Architecture within the framework of the National Scholarship Program of the Slovak Republic. Data were obtained to assess the technical condition of the structures and the bridge as a whole. As a result of the inspection, the type of destruction of each structural element of the frame and superstructure was determined. A study on the content of chloride-ionic contamination of concrete and non-destructive tests of strength parameters was carried out. A detailed research analysis of the results and recommendations for processing the reconstruction has been proposed. In accordance with the valid regulations, due to the significant deformation in the horizontal plane, the cause of which is not known and due to the gradual loss of the bearing function, we evaluate the construction, and technical condition by the degree: VI ‒ very bad, and immediate reconstruction is required. The service life of the bridge is mainly affected by corrosion and displacement of the bearings, as well as contamination of concrete with chlorides from sanding salts and corroded bearings. Corrosion of the reinforcement in the horizon of 5 years can negatively affect the load-bearing capacity of the bridge and there is also an increased risk of falling pieces of the covering layer of the reinforcement on the road leading under the bridge. The following actions are strongly recommended: replace all bearings; reconstruct the waterproofing of the bridge, roadway, drainage system, expansion join on support no. 4; consider the installation of asphalt expansion joins over support no. 1 and piers no. 2 and 3; clean the entire surface with high-pressure water and apply a remedial coating, that would slow down the corrosion of the reinforcement; renew the areas with the delaminated cover layer with a repair compound. The conclusions about the calculation of load bearing capacity are based on the current technical condition of the bridge found during diagnostics (08/2021). During further operation, it is necessary to pay attention to the state of prestressing and possible opening of joints at the contact of beam segments.

scholarly journals Load-Bearing Capacity and Fracture Behavior of Glass Fiber-Reinforced Composite Cranioplasty Implants

2017 ◽  
Vol 15 (4) ◽  
pp. e356-e361 ◽  
Author(s):  
Jaakko M. Piitulainen ◽  
Riina Mattila ◽  
Niko Moritz ◽  
Pekka K. Vallittu
Keyword(s):  
Plastic Deformation ◽  
Bearing Capacity ◽  
Glass Fiber ◽  
Resin Matrix ◽  
Fiber Reinforced ◽  
Loading Test ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Glass Fiber Reinforced ◽  
Elastic And Plastic Deformation

Background Glass fiber-reinforced composites (FRCs) have been adapted for routine clinical use in various dental restorations and are presently also used in cranial implants. The aim of this study was to measure the load-bearing capacity and failure type of glass FRC implants during static loading with and without interconnective bars and with different fixation modes. Methods Load-bearing capacities of 2 types of FRC implants with 4 different fixation modes were experimentally tested. The sandwich-like FRC implants were made of 2 sheets of woven FRC fabric, which consisted of silanized, woven E-glass fiber fabrics impregnated in BisGMA-TEGDMA monomer resin matrix. The space between the outer and inner surfaces was filled with glass particles. All FRC implants were tested up to a 10-mm deflection with load-bearing capacity determined at 6-mm deflection. The experimental groups were compared using non-parametric Kruskal-Wallis analysis with Steel-Dwass post hoc test. Results FRC implants underwent elastic and plastic deformation until 6-mm deflection. The loading test did not demonstrate any protrusions of glass fibers or cut fiber even at 10-mm deflection. An elastic and plastic deformation of the implant occurred until the FRC sheets were separated from each other. In the cases of the freestanding setup (no fixation) and the fixation with 6 screws, the FRC implants with 2 interconnective bars showed a significantly higher load-bearing capacity compared with the implant without interconnective bars. Conclusions FRC implants used in this study showed a load-bearing capacity which may provide protection for the brain after cranial bone defect reconstruction.

scholarly journals Peningkatan Nilai CBR Tanah Dasar (Sub Grade) dengan Penambahan Kapur dan Abu Sekam Padi

2019 ◽  
Vol 14 (2) ◽  
pp. 24
Author(s):  
Liliwarti -
Keyword(s):  
Bearing Capacity ◽  
Rice Husk ◽  
Soil Stabilization ◽  
Rice Husk Ash ◽  
Road Construction ◽  
Traffic Load ◽  
Rigid Pavement ◽  
The Road ◽  
Road Pavement ◽  
On The Road

The subgrade is very important on road construction, because its functions for support the traffic loads. The subgrade is not able to bearing capacity the traffic load , can cause damage such as cracks, settlement,and deformation on the flexible pavement or rigid pavement. to solve in this problems, it is necessary to improve the mechanical properties of subgrade for increasing soil bearing capacity and reducing the swelling potential. The Sicincin ring road - Lubuk Alung, Padang Pariaman district which has deformed, settlement and cracks on the road pavement, caused by poor bearing capacity of the subgrade. To solve these problems, it is necessary to have the soil improvements (stabilization) for subgrade In this paper soil stabilization is done by mixing soil with lime and rice husk ash (variations in lime content of 5%, 8%, 11%, 14% and 17%) and rice husk ash (constant 2.5%) .The compaction test and CBR test is carried for each variation. The results in this study obtained the most optimal percentage of lime + rice husk ash is 11%, CBR design is 25%, and swelling value of 0.13%. CBR value of subgrade without lime and rice husk ash obtained CBR = 2.3%. So that there is a significantly increase in CBR value if using lime and rice husk ash as stabilization material for subgrade. These results can be used by experts to choose effective stabilization methods.

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

Load-Bearing Capacity of Direct Inlay-Retained Fibre-reinforced Composite Fixed Partial Dentures with Different Cross-Sectional Pontic Design

2017 ◽  
Vol 68 (1) ◽  
pp. 94-100
Author(s):  
Oana Tanculescu ◽  
Adrian Doloca ◽  
Raluca Maria Vieriu ◽  
Florentina Mocanu ◽  
Gabriela Ifteni ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Fracture Pattern ◽  
Load Bearing Capacity ◽  
Cross Sectional ◽  
Load Bearing ◽  
Reinforced Composite ◽  
Polyethylene Fibre

The load-bearing capacity and fracture pattern of direct inlay-retained FRC FDPs with two different cross-sectional designs of the ponticwere tested. The aim of the study was to evaluate a new fibre disposition. Two types of composites, Filtek Bulk Fill Posterior Restorative and Filtek Z250 (3M/ESPE, St. Paul, MN, USA), and one braided polyethylene fibre, Construct (Kerr, USA) were used. The results of the study suggested that the new tested disposition of the fibres prevented in some extend the delamination of the composite on buccal and facial sides of the pontic and increased the load-bearing capacity of the bridges.

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