Effect of marble dust as a filler on the mechanical properties of Hot Mix Asphalt
Asphalt concrete is a hot mix of coarse aggregate, fine aggregate, filler, and asphalt binder that is hot poured to form the surface course of flexible pavement. Filler has a significant impact on the properties and behavior of asphalt mixes. Fillers fill the voids between the coarse
2025-06-28 16:26:56 - Adil Khan
Effect of marble dust as a filler on the mechanical properties of Hot Mix Asphalt
Project Area of Specialization Cloud InfrastructureProject SummaryAsphalt concrete is a hot mix of coarse aggregate, fine aggregate, filler, and asphalt binder that is hot poured to form the surface course of flexible pavement. Filler has a significant impact on the properties and behavior of asphalt mixes. Fillers fill the voids between the coarse aggregates and strengthen the bond between the asphalt binder and the aggregate. The purpose of this study was to assess the effects of using marble dust.
Laboratory studies, such as Marshall Stability and flow with associated volumetric properties testing, are used to compare the performance of asphalt mixes. Totally thirty six samples were made, out of which eighteen asphalt mix samples were made for conventional mixes and rest of eighteen were for modified mixes. Conventional mixes were made using various bitumen content percent ranging from 2.5 to 5% with the interval of 0.5%. 3 samples at each content were made and optimum bitumen content was found as 4.08%. Similarly, modified mixes were made using various marble dust content percentage ranging from 2.5% to 15% with the interval of 2.5% at 4.08% optimum bitumen content. 3 samples were made at each marble dust content percentages. Asphalt mixes made with 10% marble dust had a stability of 2744 kgf, which is higher than mixes made with conventional stone dust filler, which had a stability of 1838 kgf at 4.08 %, which is the optimum asphalt binder content. The highest Marshall flow comes from mixes containing 15% marble dust. Whereas at the optimum fillercontent 8.03% with optimum asphalt binder content, asphalt mixes including all (marble dust) mineral filler content percent satisfied the Marshall requirements of the specification guideline. Marble dust filler improved the resistance of asphalt mixes against moisture-induced degradation. When compared to mixes made with Stone dust filler, asphalt mixes made with Marble dust are more cost effective.
In summary, it can be inferred that marble dust, rather than the most widely used conventional fillers such as stone dust, can be employed as filler materials.
These three following are the project Objectives;
1/ To design Hot Mix Asphalt Mixtures.
2/ To evaluate the Effect of Marble Dust as a filler on the properties of Hot Mix Asphalt
3/ To compare the Conventional Mixes with Modified Mixes
Marshall mix design method was used. Initially all the materials (Aggregates, Bitumen, and Marble dust) tests were done. And then through this method (Marshall mix design method) Conventional and modified mixes were made.Totally thirty six samples were made, out of which eighteen asphalt mix samples were made for conventional mixes and rest of eighteen were for modified mixes. Conventional mixes were made using various bitumen content percent ranging from 2.5 to 5% with the interval of 0.5%. 3 samples at each content were made and optimum bitumen content was found as 4.08%. Similarly, modified mixes were made using various marble dust content percentage ranging from 2.5% to 15% with the interval of 2.5% at 4.08% optimum bitumen content. 3 samples were made at each marble dust content percentages. After that their all marshall properties were determined.
Benefits of the ProjectFollowing are the some benefits of project;
1/ Using Marble Dust in highways will save the economy of country, it is cost effective.
2/ Using marble dust in highways would save people and environmemt from Air and water pollution as it is dumped to the open areas which is hazardous.
3/ The use of innovative filler materials can result in pavement construction that is strong, robust, resilient to fatigue and permanent deformation, eco friendly, cand cost-
effective. i.e Marble dust.
4/ The improved characteristics of the Mineral Filler-containing mix indicate that using this material can help prevent common problems in flexible pavements before they complete their design life and improve the performance of road.
Following are the technical details;
1/ The Optimum Bitumen Content of the Conventional HMA was found 4.08%.
2/ The Optimum Filler Content for the Marble Dust Containing Mixes was found 8.03%.
3/ It can be stated that the waste material can be used as Mineral filler in the Hot Mix Asphalt at its Optimum Content 8.03% because it improved marshall properties at the OBC 4.08 % and results were found higher than the conventional mixes.
4/ New filler materials, such as marble dust, may be investigated to solve pavement failure problems, such as being able to withstand traffic loads properly under increasingly severe conditions. As a result, it is preferable that the road construction industry undertake as a pilot project.
5/ Marble dust can be used as a mineral filler in HMA construction to save money.
6/ The utilizing of such material in Hot Mix Asphalt (HMA) is cost-effective and results in waste removal from the environment and improve the performance of road.
| Item Name | Type | No. of Units | Per Unit Cost (in Rs) | Total (in Rs) |
|---|---|---|---|---|
| Total in (Rs) | 50040 | |||
| Aggregates (0-5mm) | Equipment | 25 | 228 | 5700 |
| Aggregates (5-13mm) | Equipment | 25 | 240 | 6000 |
| Aggregates (13-20mm) | Equipment | 25 | 232 | 5800 |
| Aggregates (20-25mm) | Equipment | 25 | 220 | 5500 |
| Bitumen | Equipment | 15 | 500 | 7500 |
| Marble Dust | Equipment | 50 | 24 | 1200 |
| Thinner | Equipment | 10 | 100 | 1000 |
| Engine oil | Equipment | 3 | 300 | 900 |
| Big Spoons | Equipment | 2 | 350 | 700 |
| Towel | Equipment | 2 | 500 | 1000 |
| Gloves | Equipment | 1 | 4000 | 4000 |
| Gas | Equipment | 7 | 120 | 840 |
| Thesis book | Miscellaneous | 11 | 900 | 9900 |