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Evaluation of the Effect of Rubber Modified Bitumen on Asphalt Performance
Biruk Yigezu Tefera,
Kassa Tadele,
Anteneh Geremew
Issue:
Volume 6, Issue 3, May 2018
Pages:
87-92
Received:
3 May 2018
Accepted:
28 May 2018
Published:
15 June 2018
Abstract: For over a century, paved roadways have been constructed using asphalt concrete mixes across the world. This research was aimed on evaluation of the effect of the waste rubber tire modified bitumen on Asphalt performance, to investigate physical properties such as the stability and flow. Marshall Stability Method was used to determine the Optimum Binder Content (OBC) and to evaluate the properties of the crumb rubber. Five different percentage of rubber by weight of bitumen: 0%, 5%, 10%, 15%, 20% were used. A comparative study is made among the unmodified and modified bitumen samples using the various sizes of waste rubber tire bitumen particles and the modified. The results of the study revealed that as rubber content increase from 0 to 20% penetration decreased from 68.5 to 58.5 mm. Similarly, for the same percentage increase in rubber content ductility decrease from 100 to 75 cm. Asphalt mixes with crumb rubber 15% have higher stability, it is two times more than the minimum specification and lower marshal flow. From this study it is concluded that recycled crumb rubber can therefore be beneficial to the performance of the asphalt concrete pavements as well as provide a means of safe disposal of these non-biodegradable wastes.
Abstract: For over a century, paved roadways have been constructed using asphalt concrete mixes across the world. This research was aimed on evaluation of the effect of the waste rubber tire modified bitumen on Asphalt performance, to investigate physical properties such as the stability and flow. Marshall Stability Method was used to determine the Optimum B...
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Reduction of Optimum Bitumen Content in Polyethylene Modified Bituminous Mixes
Shahreena Melati Rhasbudin Shah,
Nor Izzah Zainuddin,
Yee Hooi Min,
Nur Ain Izzati Nasaruddin,
Tey Li Sian
Issue:
Volume 6, Issue 3, May 2018
Pages:
93-98
Received:
25 June 2018
Published:
26 June 2018
Abstract: Using plastic as additive in pavement has gained popularity for the past several years. Plastics waste is a serious environmental issue due to its non-biodegradable properties and hard to be disposed. There is a high demand of plastics in the industries as a packaging and disposable consumer items due to its inexpensive, lightweight and durable properties. Polyethylene (PE) has been extensively used in packaging, pipes, toys, garbage bags and bottles. The purpose of this study is to evaluate the properties of PE modified bituminous mixture in comparison to conventional bituminous mixture. This study utilized both High Density Polyethylene (HDPE) and Low Density Polyethylene (LDPE) granules in order to achieve optimum benefits. Wearing course samples were prepared using Marshall Mix design method and according to Standard Specification for Road Works as guidelines. Laboratory study was performed on the compacted mixtures to determine the optimum bitumen content (OBC) and evaluate the effect of PE on its properties. The modified mixes show promising results: higher stability and lower optimum bitumen content (OBC) when compared to a conventional mix. The results indicate that the addition of 2% Polyethylene by weight of aggregate reduce the amount of OBC by 4.2%. Hence, Polyethylene modified bituminous mixture not only can helps reduce the waste plastics but also results in saving in pavement material costs.
Abstract: Using plastic as additive in pavement has gained popularity for the past several years. Plastics waste is a serious environmental issue due to its non-biodegradable properties and hard to be disposed. There is a high demand of plastics in the industries as a packaging and disposable consumer items due to its inexpensive, lightweight and durable pro...
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The Evaluation of Regional Instability to Climate Change Based on the PSA Model—A Case Study of Philippines
Hui Liao,
Kunling Han,
Shuo Sun,
Yajing Jin
Issue:
Volume 6, Issue 3, May 2018
Pages:
99-108
Received:
27 June 2018
Published:
27 June 2018
Abstract: In recent years, the ever-changing climate has caused natural disasters in various countries to occur frequently. Climate change has become one of the factors that have caused this country to be vulnerable. This article mainly quantitatively studies how climate change affects regional instability. A comprehensive indicator evaluation method is used to establish a PSA model. The country's vulnerability is defined in terms of the dimensions of pressure, sensitivity, and adaptive capability. This article selected Philippines as the research object, and based on the data processing by PSA model, we obtained the Fragile State Index (FSI) of Philippines in the past ten years. It has found that the flooding in 2012 has made it more vulnerable to Philippines and the results of the analysis are in line with the actual situation. Then, the K-means clustering algorithm is used to get a tipping point (0.5) that can define whether it is fragile or not. What's more, the critical point is verified to be reasonable. Finally, under the guidance of the data of the three dimensions and first-class indicators, the intervention measures that the country should take to address climate change are proposed to reduce regional instability.
Abstract: In recent years, the ever-changing climate has caused natural disasters in various countries to occur frequently. Climate change has become one of the factors that have caused this country to be vulnerable. This article mainly quantitatively studies how climate change affects regional instability. A comprehensive indicator evaluation method is used...
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