scholarly journals A Methodology for Determination of Resilient Modulus of Asphaltic Concrete

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
A. Patel ◽  
M. P. Kulkarni ◽  
S. D. Gumaste ◽  
P. P. Bartake ◽  
K. V. K. Rao ◽  
...  
Keyword(s):  
Resilient Modulus ◽  
Triaxial Tests ◽  
Asphaltic Concrete ◽  
Empirical Relationships ◽  
Cyclic Triaxial Tests ◽  
Electronic Circuitry ◽  
Quality Check ◽  
R Value ◽  
Vast Variation

Resilient modulus, , is an important parameter for designing pavements. However, its determination by resorting to cyclic triaxial tests is tedious and time consuming. Moreover, empirical relationships, correlating to various other material properties (namely, California Bearing Ratio, CBR; Limerock Bearing Ratio, LBR; R-value and the Soil Support Value, SSV), give vast variation in the estimated results. With this in view, an electronic circuitry, which employs bender and extender elements (i.e., piezo-ceramic elements), was developed. Details of the circuitry and the testing methodology adopted for this purpose are presented in this paper. This methodology helps in determining the resilient modulus of the material quite precisely. Further, it is believed that this methodology would be quite useful to engineers and technologists for conducting quality check of the pavements, quite rapidly and easily.

scholarly journals Desenvolvimento de um equipamento de grandes dimensões para análise de estruturas de pavimentos

TRANSPORTES ◽  
2010 ◽  
Vol 18 (2) ◽  
Author(s):  
Francis Massashi Kakuda ◽  
Alexandre Benetti Parreira ◽  
Glauco Túlio Pessa Fabbri
Keyword(s):  
Large Scale ◽  
Resilient Modulus ◽  
Triaxial Tests ◽  
Soil Pressure ◽  
Cyclic Triaxial Tests ◽  
Pressure Transducers ◽  
Load Cells ◽  
Pavement Structures ◽  
Good Operation

<p><strong>Resumo: </strong>O artigo apresenta o desenvolvimento, a montagem e um exemplo de aplicação de um equipamento de grande porte (seção de 1,5 x 1,5m e altura de 1,2m) para o ensaio em laboratório de estruturas de pavimentos com materiais, espessuras de camadas e condições de carregamento similares às de campo. O carregamento cíclico é aplicado por um cilindro pneumático alimentado por um compressor de ar. A instrumentação é constituída de LVDTs, células de carga e de tensão total que permitem o monitoramento das cargas aplicadas, tensões no interior das camadas e deslocamentos elásticos e permanentes na superfície do pavimento. Com as bacias de deflexões determinadas a partir dos deslocamentos elásticos superficiais, é possível, por meio de retroanálise, o cálculo dos módulos de resiliência dos materiais constituintes das camadas ensaiadas. Os ensaios realizados até o presente indicam que o equipamento apresenta bom funcionamento, sendo que o sistema pneumático atende às expectativas, os transdutores fornecem medidas com a precisão exigida e os valores de módulo de resiliência calculados por meio da retroanálise são compatíveis com os determinados em ensaios triaxiais cíclicos e com os observados em campo em condições similares.</p><p><strong>Abstract: </strong>The article presents the development, the assembly and an example of application of large-scale equipment (width of 1.5*1.5m and height of 1.2m) for testing pavement structures in laboratory, with materials, layers thicknesses and loading conditions similar to the field ones. The load is cyclic and generated from a pneumatic actuator. The instrumentation is constituted of LVDTs, load-cells and soil pressure transducers that permit monitoring the applied loads and the stress distribution in the interior of the layers, as well as plastic and elastic deformations on the pavement surface. From the deflection basin obtained, it is possible, by means of backcalculation, the determination of the materials resilient modulus. In a preliminary analysis, the equipment showed a good operation, attended to the expectations and the transducers supplied measures with the required precision. The backcalculation results were compatible with those obtained from cyclic triaxial tests and those observed in similar field conditions.</p>

scholarly journals An Evaluation of the Resilient Modulus and Permanent Deformation of Unbound Mixtures of Granular Materials and Rubber Particles from Scrap Tyres to Be Used in Subballast Layers

2016 ◽  
Author(s):  
Carlos Hidalgo Sgnes
Keyword(s):  
Granular Materials ◽  
Resilient Modulus ◽  
Permanent Deformation ◽  
Waste Material ◽  
Triaxial Tests ◽  
Rubber Content ◽  
Cyclic Triaxial ◽  
Cyclic Triaxial Tests ◽  
Vibration Attenuation ◽  
Rubber Particles

Over the last years rubber from scrap tyres has been reused in different civil works such as road embankments and railway platforms due to its resilient properties, low degradation and vibration attenuation. Unfortunately, this issue is still scarce. For instance, in Spain about 175.000 tonnes of scrap tyres were collected in 2014, of which only 0.6% were reused in civil works. Aiming to contribute to the reutilisation of large quantities of this waste material, this paper focuses on the analysis of unbound mixtures of granular materials with different percentages of rubber particles to be used as subballast layers. Mixtures are tested under cyclic triaxial tests so as to obtain their resilient modulus and evaluate their permanent deformations. It is found that as the rubber content increases, the resilient modulus decreases and the permanent deformation increases. Taking into account the usual loads transmitted to the subballast layer, the optimum rubber content that does not compromise the behaviour of the mixture is set in a range between 2.5% and 5% in terms of weight.DOI: http://dx.doi.org/10.4995/CIT2016.2016.4231

scholarly journals Evaluation of resilient behavior of a clayey soil with polyethylene terephthalate (PET) insertion for application in pavements base

2019 ◽  
Vol 92 ◽  
pp. 12006
Author(s):  
Bárbara Carvalho ◽  
Michéle Casagrande ◽  
Márcio Farias
Keyword(s):  
Environmental Problem ◽  
Clayey Soil ◽  
Resilient Modulus ◽  
Triaxial Tests ◽  
Cyclic Triaxial Tests ◽  
Pet Bottles ◽  
Production And Consumption ◽  
Alternative Material ◽  
Physical Tests ◽  
Empirical Design

The growing production and consumption of PET bottles represent a major environmental problem because they end up being improperly discarded in nature or simply stocked. With the aim to attenuate the environmental problem caused by this residue, this research proposes the use of PET flakes as an alternative material for pavements base. In order to analyze the geotechnical performance of the material, physical tests, compaction and Cyclic Triaxial tests (Resilient Modulus) were carried out on pure soil as well as on the mixture of soil and PET flakes in weight percentages of 3, 5 and 7 %. The computer program SisPav (Franco, 2007) was used to perform a mechanistic-empirical design for a typical pavement structure with parameters obtained for the mixtures. The results indicated that the insertion of PET influences the mechanical behavior of the soil. It was found that resilient modulus increases, with respect to that of pure soil, for mixtures with the lowest content of PET (3%). For tests with higher contents of PET flakes, the Resilient Modulus decreases. This research concluded that the clayey soil mixed with PET flakes can be used as an alternative material for pavements base, as long as a low content of flakes is used.

Effect of the loading frequency on the sand liquefaction behaviour in cyclic triaxial tests

2021 ◽  
Vol 147 ◽  
pp. 106779
Author(s):  
Zhehao Zhu ◽  
Feng Zhang ◽  
Qingyun Peng ◽  
Jean-Claude Dupla ◽  
Jean Canou ◽  
...  
Keyword(s):  
Triaxial Tests ◽  
Loading Frequency ◽  
Cyclic Triaxial ◽  
Cyclic Triaxial Tests ◽  
Sand Liquefaction

The Performance of Styrene Butadiene Rubber on the Engineering Properties of Asphaltic Concrete AC14

2016 ◽  
Vol 700 ◽  
pp. 238-246 ◽  
Author(s):  
Dewi Sri Jayanti ◽  
Ramadhansyah Putra Jaya ◽  
Siti Aspalaili Mohamd Sharif ◽  
Norhidayah Abdul Hassan ◽  
Siti Nur Amiera Jeffry ◽  
...  
Keyword(s):  
Resilient Modulus ◽  
Asphalt Mixture ◽  
Engineering Properties ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Asphaltic Concrete ◽  
Dynamic Creep ◽  
Creep Stiffness ◽  
And Performance ◽  
Styrene Butadiene

This study investigated the effects of adding various percentages of styrene–butadiene rubber (SBR) on the engineering properties and performance of asphaltic concrete. SBR was added into the mixture at 0%, 1%, 3%, and 5% on a mass-to-mass basis. Conventional bitumen used in this study was 80/100 PEN. The performances of SBR on the asphalt mixture properties were evaluated based on Marshall Stability, abrasion loss, resilient modulus, and dynamic creep test. Results indicated an improvement in the engineering properties and performance with the addition of SBR content. For instance, stability increased by 18.8% as the SBR content increased from 0% to 5%. Dynamic creep stiffness also increased by 46.2%. Similarly, the resilient modulus was also found to increase by approximately 84.6%.

Effect of Sugarcane Bagasse Ash as Filler in Hot Mix Asphalt

2016 ◽  
Vol 846 ◽  
pp. 683-689 ◽  
Author(s):  
M. Zulfikri M. Zainudin ◽  
Faridah Hanim Khairuddin ◽  
Choy Peng Ng ◽  
Siti Khadijah Che Osmi ◽  
N. Aina Misnon ◽  
...  
Keyword(s):  
Sugarcane Bagasse ◽  
Hot Mix Asphalt ◽  
Resilient Modulus ◽  
Public Works ◽  
Laboratory Result ◽  
Asphaltic Concrete ◽  
Maintenance And Rehabilitation ◽  
Experimental Laboratory ◽  
Sugarcane Bagasse Ash ◽  
Marshall Stability

Hot Mix Asphalt (HMA) is a combination of asphalt and aggregates that will give durable road surface for pavement and is widely used in Malaysia. However, due to damages caused by excessive traffic loadings, the HMA pavement normally required frequently maintenance and rehabilitation works. Therefore in recent years, research on modification of HMA has tremendously increased in highway construction field using natural sources and recycling products such as rubber, plastic, anti-stripping agents, waste materials and etc. This study was conducted to evaluate the effect of sugarcane bagasse ash (SCBA) used as filler in HMA. Experimental laboratory were done to compare the properties of normal HMA sample with modified HMA sample using SCBA. Result obtained for both sample were compared to Malaysian Public Works Department (MPWD) specification. The laboratory result reveals that SCBA are effective in increasing the Marshall stability, flow and Resilient Modulus of normal HMA. The SCBA increases Marshall stability by 0.6%, flow 4.9% and Resilient Modulus 17.4% respectively of ordinary HMA and all test and analysis parameters for asphaltic concrete of SCBA sample comply with MPWD requirements. Therefore, SCBA has potential in modifying normal HMA.

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