Abstract
Several parameters affect asphalt mix performance against loading and environmental conditions. Minor changes in the filler amount or type can cause obvious changes in the asphalt mixture properties. Accordingly, in this research attempts have been made to optimally make asphalt mixture strong against loading and environmental conditions by changing the type, size and percentage of filler used in asphalt mixture. In this line, the effect of two types of cement and nano-silica fillers in two different percentages was investigated and compared as an alternative for part of the main filler in asphalt mixture samples made by two types of limestone and granite aggregate. Cement filler by 2% and 4% of the aggregate mass as the alternative for part of the main filler is added to stone materials before mixing with binder, but nano-silica filler by 2% and4 % of weight of the binder as the alternative for part of the main filler is added to binder and a modified and homogeneous binder is produced using a high speed mixer. In the following, considering the optimum binder content for each mixture, resilient modulus tests were conducted to determine the strength performance against loading and indirect tensile strength ratio was used to determine moisture sensitivity of asphalt mixtures. Results obtained from resilient modulus tests show that the use of nano-silica and cement has been capable of favorably improving the resilient modulus of samples containing these two types of fillers. The improvement of the resilient modulus of samples containing nano-silica is very significant. Additionally, the studies conducted based on the indirect tensile strength ratio show that both types of alternative fillers, especially cement has been capable of desirably improve the strength of asphalt mixtures against moisture damage.
Highlights
Asphalt mixtures are widely used materials that produced for paving of road surfaces
After the optimum binder content was determined for each compound, the indirect tensile strength ratio and resilient modulus tests were done
In order to improve resilient modulus and the hot mix asphalt strength to moisture, certain percentages of nano-silica and Portland cement were used as an alternative to the part of the filler (2% and 4%)
Summary
Asphalt mixtures are widely used materials that produced for paving of road surfaces. Several factors affect damages intensity, including the aggregate and binder properties, asphalt mixture properties, construction and implementation methods, dynamic effects due to moving vehicles, anti-stripping additives type and properties and Etc. The mechanism of these effects has not been correctly determined, and this causes a variety of methods to be presented in order to increase asphalt mixtures strength to moisture [6]. One of the proposed methods is using appropriate fillers, because the existence of filler play an important role in modifying asphalt mixture properties based on its characteristics [7, 8].
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.