Mechanical properties of stone mastic asphalt incorporating nano titanium modified asphalt binder

Due to its rough surface texture, Stone Mastic Asphalt (SMA) can create great qualities, such as good skid resistance and better visibility during rainy days, as well as optimal light reflection. The service life of SMA, on the other hand, reduces owing to a rapid increase in traffic loads, heavy traffic, and environmental conditions. TiO2's stable qualities and optimal content can help to improve the performance of modified asphalt at a reasonable cost and with low filler content. This study explores the effect of nano titanium on the performance of stone mastic asphalt. Virgin bitumen is modified with 2% and 4% of nano titanium by bitumen weight. The physical properties of the bitumen are accessed by carrying tests such as penetration tests, softening points, and ductility. The results show that the modified bitumen samples of 2% Nano-TiO2 powder content for bituminous tests have enhanced hardness, consistency, and ductility. While for the performance tests for the SMA samples are abrasion, Marshall stability, resilient modulus, and dynamic creep. Overall, 2% Nano-TiO2 powder content has been determined for the optimum content and best performance, where it provides high stability, strength and enhances stiffness effectiveness, which can improve SMA performance. However, the findings show lack of awareness and research is a factor that does not receive special consideration from the industry or the government. Therefore, the sharing of ideas and technology for each continuous research is needed to improve construction quality

The influence of nano titanium as bitumen modifier in stone mastic asphalt

Nanomaterials are emerging as one of the methods to improve the pavement industry. Due to that, this study explores the influence of nano TiO2 modified binder and mixture with 60/70 grade bitumen. The first stage discovers the physical properties of bitumen by undergoing penetration and softening point tests. Then, the nano TiO2 modified binder is evaluated in terms of its morphological and chemical properties. To verify the modified binder design, the mechanical performance of stone mastic asphalt (SMA) is assessed in terms of volumetric properties. From the results, 5% nano TiO2 modified binder shows significant improvement in terms of penetration and softening point. The results also show that the 3% nano TiO2 modified binder contributes the highest improvement in terms of its chemical properties and the morphological properties. Based on the morphological properties’ evaluation, FTIR and XRD observed a sharp peak of nano TiO2 while the bitumen containing nano TiO2 is well distributed when SEM-EDX was applied. In addition, the volumetric properties of SMA also significantly improve with the addition of nano TiO2. It can be said that the addition of nano TiO2 is able to enhance the overall properties of bitumen

Properties of Stone Mastic Asphalt Incorporating Nano Titanium as Binder's Modifier

Stone mastic asphalt is a gap-graded mix and is usually related to its high bitumen content and its skeleton-like constitution. Although famous for its durability, high resistance to fatigue and rutting, issues such as bleeding and premature aging do occur in the mix since it has a high bitumen content and voids due to its gap-graded structure. In order to encounter these problems from affecting the mix, some instances such as adding additives, rejuvenators and stabilizers into the mixture has been implemented

Mechanical performance of dense-graded asphalt mixture incorporating steel fiber

Dense graded asphalt is usually used for highways, main roads, industrial and distributor roads due to their densely packed constitution. In order to improve more on its durability, stability and service life various additives are introduced and among them are steel fibers. Steel fiber has been reported that it increases the mechanical performance of asphalt mix. This paper reports on a comprehensive study on the mechanical properties of dense-graded asphalt AC10 incorporating steel fibers. Mechanical properties studied include abrasion resistance, stability, density, stiffness, resilient modulus and dynamic creep of asphalt mixtures. The tests carried out are Abrasion test, Marshall Stability, resilient modulus and dynamic creep. Steel fiber content used was 0%, 0.2%, 0.4% and 0.6% of the asphalt mixtures. The laboratory results showed that steel fiber addition into DGA AC10, improve all the mechanical properties covered in this investigation except the stiffness. Although the addition of steel fiber reduces stiffness properties that makes it revealing to the deflection, the modified samples still shows improvement in abrasion, stability, density, resilient modulus and dynamic creep

Performance of stone mastic asphalt incorporating Kenaf fibre

Stone Mastic Asphalt (SMA) contains a high amount of aggregate making it has a better interlocking due to the stone to stone contact but it is susceptible to binder drain down problems. Thus, the aim of this study is to utilize different percentages of Kenaf fibre in Stone Mastic Asphalt to overcome issues related to Stone Mastic Asphalt such as rutting and cracking due to high traffic volumes and extreme weather. Among the test involved were LA Abrasion, Marshall Stability, Resilient Modulus, and Dynamic Creep. From the results, it shows that the addition of 0.2% fibre contributes to lowest value of abrasion. While, 0.2% fibre produce the highest density. It could be seen 0.6% of Kenaf fibre producing highest value of resilient modulus. Dynamic creep also shows a significant value in 0.2% addition. Thus, it can be concluded that the existence of fibre is capable in enhancing the performance of SMA which is evident for instance, the density. For future study, it is recommended to analyses the performance of SMA in terms of creep resistance, Marshall Stability, and rutting resistance of SMA with the existence of Kenaf fibre in order to prove its reliability in various applications in asphaltic mixture

Performance of stone mastic asphalt incorporating nano titanium modified asphalt binder

Stone mastic asphalt (SMA) is a type of flexible pavement that suit to high traffic area. Therefore, SMA can cater high volume of traffic loads. Over the years, SMA design keeps improving by adding stabilizers, additives, or even modifying the binder. However, this modification sometimes costly and not environmentally friendly. In addition, due to gap graded characteristic of SMA where the aggregate gradation is not well graded (minimum aggregate size variation), SMA suffers a few drawbacks like bleeding and binder drain off during mixing and transporting. Among the potential additive that may improve the properties is nanomaterials. Nanomaterials in asphalt mixture have pique interest lately. Nanomaterials show a potential modifier that can encounter problems in asphalt mix like premature deformation, rutting, and fatigue. Thus, Nano titanium was used in this study with the range of 1% to 5% by weight of virgin bitumen. The modified bitumen is accessed by its physical properties through softening point test, penetration test and rotational viscosity, while for chemical properties, FTIR and XRD are carried out, and SEM-EDX for morphological properties. The laboratory is further performed by assessing the mechanical performance of nano-modified SMA by its resilient modulus, moisture susceptibility, and dynamic creep test. From the results, at 3% addition of nano titanium, the resilient modulus of SMA shows a 50% increasement in strength compared to the unmodified sample for both 25℃ and 40℃. The binder drain down also shows at 2% nano titanium modified sample, the binder drains down is reduced by 91.5%. The same goes for modified binder at 3% for SEM-EDX, which shows more well-dispersed binder components without eliminating the chemical binder elements that are already present. In conclusion, the modification of the binder with nano titanium has influenced the composition of the binder which brings improvements in all aspect of the bitumen which promotes the mechanical performance of the mix. This study is done to improve the mechanical performance of stone mastic asphalt by modifying the binder with nano titanium in hope to obtain a more well enhanced SMA mixture that could contribute to the expressways of Malaysia