Performance Evaluation of Hot-mix Asphalt Mixture Using Recycle Brick powder as a Filler with Super pave Aggregate Gradation.

Abstract

The utilization of Recycling materials in the construction industry is increasing worldwide. The influence of different types of filler materials on the mechanical properties of asphalt concrete mixture varies with its particle size, shape, surface area, surface texture, and other physio-chemical properties. One of the main problems in asphalt paving mixtures is obtaining a sufficient amount of filler materials. In addition to this, there is an environmental deterioration during the production of filler materials and a cost overrun of filler materials, due to this problem this investigation mainly utilization of waste recycling brick powder as filler materials in hot mix asphalt (HMA) production. The main objective of this study is to investigate the Performance Evaluation of Hot-mix Asphalt Mixture Using Recycle Brick powder (RBP) as Filler with Super pave Mix design method. For this research, Non-Probability sampling technique was adopted to collect samples. The engineering properties of materials used for the component of HMA such as (Bitumen 80/100 penetration grad, Aggregates, Recycle Brick powder, and crushed Stone dust) are investigated based on standard specifications. Based on this, the effect of Recycle Brick powder as a filler material on Marshal Properties, Striping test, moisture susceptibility, and permanent deformation in asphalt mixtures was investigated in detail. The chemical composition of Recycle Brick powder shows that the entire content of Silicon Dioxide (SiO2),Aluminum Oxide (Al2O3), and Iron Oxide (Fe2O3) was 62.68%, 14.74 %, and 9.16% respectively, satisfying a minimum requirement of Natural Pozzolan materials. The physical properties of Recycle Brick powder were conducted on specific gravity and Plastic Index was 2.66 and non-plastic respectively. Hot Mix Asphalt specimens were prepared from three different Superpave gradations with conventional filler Crushed Stone Dust (CSD) of different proportions (4.0, 5.0, and 6.0 %) and eight different bitumen content (3.0, 3.5, 4.0, 4.5, 5, 5.5, 6.0 and 6.5 %). Based on Ethiopian Road Authority pavement design manual 5.0 % of CSD was selected as the control mix based in this study. The conventional filler was replaced by Recycle Brick powder at different replacement rates(1%+4%, 2%+3%, 3%+2%, 4%+1%, 5% +0%,RBP and CSD respectively) on the basis of a control mix with 5 % CSD and5.45% Optimum Bitumen Content (OBC).Therefore, the replacement rates of 3%RBP+2%CSD convince ERA standard specification of marshal properties, it’s more economical and low permanent deformation (2.88 mm) and with high tensile strength ratio (94.39%) were observed. The outcomes of the experiments indicated that the use of Recycle Brick powder on HMA has fulfilled the criteria specified on the specification as a filler with Superpave aggregate gradation up to 3%RBP+2%CSD replacement of conventional filler in HMA production.