scholarly journals Investigation of Mechanical and Hydrologic Characteristics of Porous Asphalt Pavement with a Geocell Composite

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3165
Author(s):  
Jaehun Ahn ◽  
Tan Hung Nguyen ◽  
In Kyoon Yoo ◽  
Jeongho Oh
Keyword(s):  
Bearing Capacity ◽  
Hydrological Cycle ◽  
Asphalt Pavement ◽  
Load Test ◽  
Rainfall Simulation ◽  
Base Layer ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Plate Load Test ◽  
Porous Asphalt

Porous asphalt pavement is a part of the permeable pavement system, which can be used to mitigate the negative impacts of urbanisation on the water hydrological cycle and environment. This study aims to assess the mechanical and hydrologic characteristics of porous asphalt pavements, with and without geocell composites, using a plate load test, falling weight deflectometer test, and rainfall simulation test. The corresponding results indicate that the elastic modulus of the unreinforced pavement is lower than that of the reinforced pavement. The analysis demonstrates that the use of geocell composites effectively increases the load-bearing capacity of the pavement. When the base layer is reinforced with geocells, its load-bearing capacity increases. Observation of the rainfall simulation tests on the reinforced pavement indicates that the reinforced pavement effectively handles the surface runoff.

scholarly journals OTIMIZAÇÃO DO CÁLCULO DA CAPACIDADE DE CARGA E TENSÃO ADMISSÍVEL DO SOLO PARA SAPATAS ISOLADAS

2016 ◽  
Vol 12 (2) ◽  
Author(s):  
Bruna Leal Melo de Oliveira ◽  
Luciana Barbosa Amancio
Keyword(s):  
Bearing Capacity ◽  
Human Error ◽  
Specific Weight ◽  
Load Test ◽  
Allowable Stress ◽  
Microsoft Excel ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Plate Load Test ◽  
Short Period

RESUMO: Para o dimensionamento geotécnico de fundações superficiais é necessário conhecer a tensão admissível do solo, obtida indiretamente a partir da capacidade de carga; ou diretamente aplicando-se os métodos semiempíricos. Uma alternativa para automatizar esses cálculos é a utilização de planilha eletrônica, uma ferramenta simples, com o intuito de otimizar o tempo e reduzir as falhas humanas. Para demonstrar a aplicabilidade e a eficiência desta ferramenta, desenvolveu-se uma planilha eletrônica através do software Microsoft Excel que, a partir de variáveis como: coesão, ângulo de atrito, peso específico e nível freático; dentre outras, é capaz de estimar a capacidade de carga e a tensão admissível para sapata isolada, em diferentes ocasiões, por diversas metodologias consagradas e, além disso, exibir graficamente a comparação entre os resultados obtidos. Por fim, a ferramenta foi aplicada em três cenários fictícios: (1) sapata quadrada com variação da cota de assentamento; (2) sapata retangular com variação do nível freático e (3) sapata circular com realização de ensaio de placa, comprovando que é possível testar várias hipóteses para um mesmo problema em um curto período de tempo. ABSTRACT: For geotechnical design of shallow foundations it is necessary to know the allowable stress of the soil, obtained indirectly from the load bearing capacity; or directly, applying the semi-empirical methods. An alternative to automate these calculations is the use of spreadsheet, a simple tool, aiming to optimize time and reduce human error. To demonstrate the applicability and effectiveness of this tool, a spreadsheet was developed using the Microsoft Excel software, based on some variables such as: cohesion; friction angle; specific weight; groundwater level; among others, to estimate the load bearing capacity and the allowable stress for isolated footing on different occasions, by several methodologies, and in addition, to show graphically the comparison between the results obtained. Finally, the tool was applied on three fictitious scenarios: (1) Square isolated footing with variation of the settlement quota; (2) rectangular isolated footing with variation of the water level and (3) circular isolated footing with execution of the Plate Load Test, proving that it is possible to test several hypotheses for the same problem in a short period of time.

scholarly journals Ultimate Bearing Capacity of Stabilized Soil in Pavements

2020 ◽  
Vol 9 (5) ◽  
pp. 2349-2351
Keyword(s):  
Fly Ash ◽  
Bearing Capacity ◽  
Coal Ash ◽  
Ultimate Bearing Capacity ◽  
Load Test ◽  
Base Layer ◽  
Plate Load Test ◽  
Rubber Powder ◽  
Stone Dust ◽  
Stabilized Soil

This paper discusses the Ultimate Bearing Capacity of a stabilized soil by using the fly ash, stone dust and rubber powder for design of a pavement. This paper will help in utilization of locally available waste materials to reuse in the subbase and subgrade layers of pavement. Rubber powder is a waste byproduct generated from the recycling of tires, and is not so easy for degradable, and hence leads to release of harmful gases when it tends to burn. Stone dust is a locally available waste generated product from quarries. The generation of stone dust is increasing day to day in large quantity. The huge quantity of stone dust storage amount will affect the quality of soil. Fly ash is waste combusted coal ash powder generated from the steamers of coal boilers with the burning of fuel gases together. In the sub grade layer the soil is mixed in different proportions with stone dust for hard foundation. In the sub base layer the soil is stabilized with the combination of rubber powder and fly ash. When the rubber powder and fly ash, mixed with water for compaction generates a bond between the soil particles to settle the air fields. In this paper various percentages of rubber powder, stone dust and fly ash with different samples for pavement is layered, and after that plate load test is conducted upon it.

scholarly journals Analysis of Tribological Behavior of Carbon Nanotube Based Industrial Mineral Gear Oil 250 cSt Viscosity

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Shubrajit Bhaumik ◽  
S. Prabhu ◽  
Kingsly Jeba Singh
Keyword(s):  
Carbon Nanotube ◽  
Bearing Capacity ◽  
Wear Test ◽  
Mineral Oil ◽  
Load Test ◽  
Multiwalled Carbon Nanotube ◽  
Load Bearing Capacity ◽  
Multiwalled Carbon ◽  
Sem Images ◽  
Load Bearing

The paper investigates the exceptional antiwear and extreme pressure properties of multiwalled carbon nanotube based mineral oil. Different samples of oil containing varying proportions of MWNT (MWNT) and graphite were prepared. The samples were tested for their antiwear and load bearing capacity according to ASTM G99 and ASTM D-2783 standards. After pass load test in four ball tester the rubbed surfaces were investigated with Scanning Electron Microscope (SEM) images. The wear test results show a decrease wear by 70–75% in case of multiwalled nanotube based mineral oil as compared with pure mineral oil. Furthermore, it has been observed that the load bearing capacity in case of multiwalled carbon nanotube based mineral oil increases by 20% as compared to pure mineral oil. A comparison in the antiwear and load bearing capacity properties of graphite and nanotube based mineral oil was studied which showed the inefficiency of graphite based lubricant over MWNT based oil. Thus, the finding would be helpful in developing new nanoparticle based lubricants.

Assessment & Analysis of Service Performance for Small-Span Suspension Bridge with Steel Truss Girders

2012 ◽  
Vol 178-181 ◽  
pp. 2187-2191
Author(s):  
Hao Sun ◽  
Yong Jiu Qian ◽  
Fang Zhang
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Static Load ◽  
Service Performance ◽  
Load Test ◽  
Suspension Bridges ◽  
Static Load Test ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Steel Truss

Most of the short span suspension bridges with steel truss girders early constructed will approach their design service life. Correctly evaluating the actual service performance is the basic basis of repairing, strengthening and technical reconstruction. First, load-bearing capacity evaluation based on static load test was briefly introduced. Then, combined with Chengnan bridge, the main existing damages and their causations of the bridge were summarized and analyzed. Based on the field detection datum and original design load grade, the finite element mode with some damages was established. Then, by analyzing the calculation results, the scheme of static load test was confirmed. Through comparing the static load test results with the results of upgraded finite element, the actual conditions of the existing bridge structure were evaluated. In order to resume its load-bearing capacity, some of measurements and suggestions of strengthening were proposed.

scholarly journals Experimental Study of the Fatigue Performance of the Bonding Surfaces and Load-Bearing Capacity of a Large-Scale Severely Damaged Hollow Slab Strengthened by CFRP

2021 ◽  
Vol 13 (21) ◽  
pp. 12179
Author(s):  
Hao Hu ◽  
Chuan-Zhi Dong ◽  
Jiji Wang ◽  
Jiaqi Chen
Keyword(s):  
Bearing Capacity ◽  
Large Scale ◽  
Single Point ◽  
Experimental Studies ◽  
Real Life ◽  
Load Test ◽  
Strengthening Effect ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Destructive Test

In recent years, carbon fiber reinforced polymer (CFRP) has been widely used in bridge repair, retrofitting, rehabilitation and strengthening to improve the bearing capacity. Although many studies have been conducted to explore the strengthening efficiencies of CFRP, the test specimens were small and the results were difficult to apply to full-scale bridges. Investigations into the strengthening effects of CFRP on real life structures rely on field load tests (without damaging the structures), making it difficult to understand actual improvements in load carrying capacity and strengthening effect. Moreover, there have been few experimental studies on the fatigue performances of CFRP-strengthened structures, especially on the large-scale structures with real wheel moving loads. In this study, the feasibility and efficiency of CFRP strengthening and repair was investigated on a large-scale, prestressed concrete hollow slab decommissioned from a real-life concrete bridge. The hollow slab was first put through a destructive test to test the ultimate load-bearing capacity. Then, CFRP strips were installed on the surface of the severely damaged slab to repair and strengthen it. Fatigue load test—including the moving load test and single point sinusoidal load—and load-bearing capacity tests were conducted on the CFRP-strengthened hollow slab after the destructive test to evaluate the strengthening performance. This study could help us to understand the actual load-bearing capacities of severe damaged concrete structures strengthened by CFRP, reduce waste, save resources and improve the utilization of our infrastructures.

scholarly journals Stabilization on Expansive Soil with Different Sand Layers

2019 ◽  
Vol 8 (12S) ◽  
pp. 1249-1254
Keyword(s):  
Bearing Capacity ◽  
Water Movement ◽  
Ground Improvement ◽  
Preliminary Test ◽  
Load Test ◽  
Load Bearing ◽  
Plate Load Test ◽  
Load Tests ◽  
Settlement Behaviour ◽  
Problematic Soil

Problematic Soil improves by better root growth, water movement, and also by mixing portions of the soil profile, to provide more uniform texture. As a ground improvement technique to improve the strength of problematic soils and this study is carried out to understand the settlement behaviour of layered soils. The soil which is collected was found to be problematic in nature, which is more swelling in nature. The samples of soil are collected the from Mudichur road, Tambaram. The sand used in this study is taken from nearby site and is used to improve the problematic soil by forming a layer of required thickness. The preliminary tests are conducted on the soil samples to determine their properties as per IS standards. After the preliminary test, the plate load tests are performed on the soil with square plate (10 mm x 10mm) in order to know the bearing capacity of soil. The load tests are performed on sand and clay layers with varying thickness of 5cm, 10 cm and 15 cm of sand over clay soil. From the plate load test the load- settlement behaviour of soil layers are studied. It can be conclude that if different layers of sands are provided over Problematic soil then It gets enough Load bearing resistance which can be further gets implemented during Highways constructions. The results says that of 15 cm layer of sand shows maximum load bearing capacity & shown better load – settlement graphs as well.

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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