International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 05 | May 2023
p-ISSN: 2395-0072
www.irjet.net
MARSHALL MIX DESIGN FOR COASTAL ROADS IN KERALA Sreedhar H Kartha1, Alan Luke2, Albert K Thomas3 Aswin A Nair4 1,2,3,4Student, Dept. of Civil Engineering, St. Josephs College of Engineering &Technology Palai, Kerala, India
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Abstract - Coastal highways are one of the developing modes of transportation in India. Due to the convenience of operation and maintenance and by considering its low cost and abrasive resistance, asphalt mixtures are commonly used for the construction of coastal roads. Since the coastal highways run near and parallel to the sea, they are always vulnerable to sea water and it is widely known that salinity badly impacts asphalt. Asphaltic pavements which are subjected to the effect of salinity shows reduced cracking resistance, reduced adhesion between binder and aggregates, reduced load bearing capacity, aging etc. and these are mainly due to the migration of salt into the mixture and resulting crystallization effect and other chemical reactions. Though coastal highways are emerging widely in Kerala there is no practical and cost-effective solution for this problem of salinity. A number of researches are conducted to understand the effect but very few are intended for finding a solution. So, in this paper we are using Marshall stability and Retained Marshall stability tests on various samples containing candle wax, natural rubber, and plastic waste as added additives to study the effect of salt water on the load-bearing capacity and flow rate of the sample. Water sample collected from a seashore and a laboratory-prepared salt water sample are used to evaluate the samples. These results are compared with the wet and dry Marshall stability and volumetric properties of sample without any added additives to find a suitable solution to address this problem considering both practicality and cost effectiveness in the form of a modified asphalt mix.
pavement types like concrete pavement with all the same benefits. Bitumen is known for its superior abrasion resistance and flat surface. But when bitumen is used in coastal areas it is subjected to salinity and it negatively affects the life and properties of bitumen. Bitumen when comes in contact with salt results in aging, reduction in cracking resistance, reduction in adhesion between bitumen and aggregates and an increase in chances of stripping. The effect of salinity which is to be seriously considered is the reduction in binding ability of bitumen as it is the root cause for stripping, cracking and aging. It is the bitumen binder that binds the aggregates together and forms the pavement but when this ability of bitumen is affected it will affect the entire serviceability of pavement.
Fig-1: A burst salt blisters
Keywords: Marshall stability, Retained Marshall stability, Candle wax, Natural rubber, Plastic waste.
1.INTRODUCTION Coastal highway which runs parallel to the coast is one of the major upcoming projects of Kerala. It spreads around 623 kms from Trivandrum to Kasaragod. Bituminous mix is used for the construction of coastal roads as same as that of other roads and highways. Besides from other locations coastal areas are always vulnerable to the effect of salinity in the form of sea water, spraying of salt, fog and mist containing salt etc.
Fig-2: Water & salt crystals in cracks in a car park Sea water is mainly composed of sodium chloride (NaCl) and sodium sulphate (Na2SO4) and this will chemically react with binder and aggregate and cause problems other than the above discussed ones. The impacts of sea water on bituminous mixes are due to the crystallization effect after the migration of salt from sea water into the mixture.
Bituminous mix mainly consists of a bitumen binder, coarse and fine aggregates and filler material. Bitumen is commonly used for the construction of roads around the world due to its convenience in maintenance and operation. Bitumen has gained popularity also due to its low cost compared to other
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