Dense Grade Bituminous Mixes with Coal Ash by Using Natural Fiber

This is Civil project report on "study on development in engineering properties of dense grade bituminous mixes with coal ash by using natural fiber". This project is for specific branch of Civil engineering that is "Pavement Engineering". This M.tech project work is done to provide the best use of ash, namely bottom ash as fine aggregate and fly ash as mineral filler with natural fiber (such as sisal fiber) used to improvise the engineering properties of bituminous paving mixes. You can also Subscribe to FINAL YEAR PROJECT'S by Email for more such projects and seminar.

In the present report, dense graded bituminous mix specimens are formed using natural aggregate as coarse aggregates, bottom ash as fine aggregates, fly ash as filler and sisal fiber as additive. Some part of of aggregate for dense graded bituminous macadam (DBM) grading has been considered as per MORTH (2013) having nominal maximum aggregates size (NMAS) 26.5 mm. To strengthen the mix, slow setting emulsion (SS1) coated sisal fiber is added in varying percentage of 0, 0.25%, 0.5%, 0.75%, and 1% by weight of the mix, with different length variations such as 5mm, 10 mm, 15 mm and 20 mm.

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In this Civil report chapter 4 describes the experimental work done to ensure the performance characteristics of the DBM mixture made from coal ash and sisal fiber. The experimental work includes Marshall properties analysis, Indirect Tensile Strength test (ITS), Tensile strength ratio, Retained stability test and Static creep test. If you directly want to see the result analysis of several test results for modified and unmodified DBM mixes, check chapter 5.


It is finally observed that not only satisfactory, but also much improved engineering properties result with coal ash as fine aggregate and filler, stabilized with natural sisal fiber duly coated with SS-1 emulsion in advance. Utilization of non-conventional aggregate like coal ash and natural fiber together thus may help to find a new way of bituminous pavement construction.


The coal ash dumping which is a serious concern to everyone in respect of its disposal and environmental pollution, can find one way for its reuse in an economical way by substituting natural resources of sand and stone dust. Use this report only for your reference and study purpose and thanks to the author of the project.


Author:- Saswat Biswapriya Dash

Source: NIT Rourkela

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