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原文传递 GREENER ROADS: INDIA SPECIFIC AND DIRECT CARBON DIOXIDE (CO_2) EMISSIONS FROM BITUMEN

题名：	GREENER ROADS: INDIA SPECIFIC AND DIRECT CARBON DIOXIDE (CO_2) EMISSIONS FROM BITUMEN
正文语种：	eng
作者：	TAMOSI BHATTTACHARYA;SIKSHA SWAROOPA KAR
作者单位：	School of Planning and Architecture
摘要：	Reduction in Carbon dioxide (CO_2) emission from road construction is an essential indicator or criteria of Greener Roads. CO_2 Emission factor of any material, both direct and embodied are however subject to change over time and country with change in technologies, industrial processes and material quality. Currently, for most materials and processes, default emission factors are being used following IPCC- Tier 1 methodology, which is fine when projects with same technology and materials are compared. However, if one needs to assess alternative materials and technologies for the same project, default/ global emission factors may either give an over or under-estimated value. This can actually result in wrong decision making and leading to a greener road with increased unaccounted CO_2 emission. Besides, it is also necessary to identify the processes and stages that are not accounted for CO_2 emissions till date. This will further help in increasing the scope of reducing the CO_2 emissions from a particular process or stage. CO_2 emission from bitumen during road construction presently is calculated based on its embodied emission factor. The direct emission component which accounts for significant emissions arising during heating of bitumen for mixing with aggregate at different temperatures is not accounted for. This Paper presents findings of an experimental work of measuring direct carbon dioxide emitted by different bitumen binders during heating using Non-Dispersive Infrared Radiation (NDIR) technology-based CO_2 analyzer. Samples of various types of bitumen binders like Crumb Rubber Modified Bitumen (CRMB 60), Polymer Modified Bitumen (PMB 40), Viscosity Grade (VG)-30 and VG-40 taken from various sources were tested in the laboratory. Results from the experimental work show that there is direct, measurable emission of CO_2 from bitumen binders during heating for mixing, and that this information should form the basis for more detailed investigation for assisting a better-informed selection criterion between the straight run and polymer modified variants of bitumen binders. Comparison of emissions at their respective mixing temperatures, as specified in the Codes, shows that PMB-40 has the highest direct CO_2 emission factor followed by CRMB-60, VG-30 and VG-40.
出版年：	2022
期刊名称：	Indian Highways
卷：	50
期：	2
页码：	49-54