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n India, the flexible pavements acquire most of the total road network. Hot mix
technology has numerous drawbacks. Some of them are the liberation of greenhouse gases, high
consumption of energy, health hazards to construction labours, etc. Compared to hot bituminous
mixes, fewer studies have been done to ascertain the effect of fibre on the performance of cold
bituminous mixes. This study aims to assess the performance of CBM by adding a natural fibre
(coir), which is abundant and cheaper in India. The objectives of the study are to identify the
Optimum In the present study, an attempt has been made to study the effect of coir fibre used as
an additive in CBM. Bitumen emulsion content is varied from 7% to 9%, and fibre content is
varied from 0.1% to 0.3%. The fibre length varied from 10 mm to 20 mm. Marshall Specimens
are prepared for NMPS 13.2 mm gradation with and without coir fibre. Based on the results,
Optimum Emulsion Content is 8%. Coir fibre free from moisture is added to the aggregates in a
dry process to achieve homogeneity in dispersion and avoid the balling problem. Maximum
Marshall Stability is observed at 0.2% of 15 mm length coir fibre. It is observed that the addition
of coir fibre had improved Retained Marshall Stability value. Rutting resistance is studied by
conducting wheel tracking test with and without fibre. Rutting resistance of the mix is improving
with the addition of coir fibre when compared to conventional mix.
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