AGING OF BITUMEN


INTRODUCTION:
Transportation facilities are required for the economic development of a country .

Population growth and economic development result extensive development of asphalt-paved roadways

Bitumen is used for coating in pavement construction .

Bitumen serves as a satisfactory binder in improvement of physical interlocking of aggregate bitumen mixes

Its properties changes as it ages in bulk storage , transport and storage on site.

The aging of bitumen then leads to deterioration of pavement
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RUBBERIZED BITUMEN FOR ROAD WORKS


Introduction
Development of infrastructural facilities like road is vital for the economic growth of a country. Good roads improve connectively, accessibility, mobility and productivity. The use of bitumen modified using polymeric materials like natural rubber, synthetic rubbers and plastic etc. have helped to a great extends in improving the quality of roads. Bitumen thus modified employing polymers are known as Polymer Modified Bitumen (PMB). Out of these Natural Rubber Modifi ....etc

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EVALUATION UNAVAILABILITY DUE
TO AGING FAILURES



Abstract

The paper presents a method to evaluate unavailability due to aging failures and incorporate that in power system reliability evaluation. it use of normal and weibull distribution for modeling aging failures probability distribution functions. The defined unavailability of aging failures has a consistent form which is the same as that for repairable failures.

INTRODUCTION

There are two failure modes for a power system component: 1) r ....etc

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Aging Effect on Leakage Current Flow in Wooden Poles



ABSTRACT

Insulation degradation leading to leakage current flow through high voltage insulators
could result in catastrophic failures such as pole fires and damages to nearby
equipment. This paper examines the leakage current distribution originating from the
high voltage conductor to various locations through the wooden pole of various age
profiles. The specimens that are investigated in this paper range from a new sample to
an aged pole sample of ....etc

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Abstract
Both the rolling thin film oven test (RTFOT) and the short-term oven aging (STOA) methods are used in the laboratory to represent
the aging of an asphalt binder during plant mixing, transportation and paving. The RTFOT is conducted at 163 C for 85 min, and the
recommended STOA methods are to heat the loose mix in a forced draft oven either at 135 C for 4 h or at 154 C for 2 h dependent on
the asphalt binder’s stiffness. The actual time of short-term aging in the field varies depending on hauling dist ....etc

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