Abstract
Micro surfacing (MS) is a type of bituminous coating frequently applied in the surface of pavement structures in order to prevent the occurrence of common distress and/or as a maintenance procedure. Micro surfacing has successfully been used in some states of Brazil as well as in many countries all over the world. Local aggregates used for micro surfacing composition are in some cases scarce and/or expensive. Therefore, the main objective of the present research is to verify the technical, financial and environmental viability of using steel slag aggregate (SSA) in micro surfacing applications. To reach the main objective, a procedure was developed in four steps. In the first step it was made the characterization of conventional (granitic) and alternative aggregates (steel slag) and polymer-modified emulsified asphalt. In the second step, mix design, surface abrasion resistance and setting time tests were performed. In the third step, the micro surfacing mechanical performance was analyzed using a laboratory traffic simulator to observe accumulated permanent deformation; surface wear; micro texture and macro texture. In the fourth step, a comparative study of costs concerning micro surfacing application using conventional mineral aggregate (MS-MA) and alternative aggregates (MS-SSA) were performed. The laboratory procedure results indicated that the steel slag studied has the potential to be used in micro surfacing applications with more rutting resistance and better durability. The cost analysis showed for medium transport distances bigger than 60 km, the MS-SSA will be cheaper than MS-MA solution.
Highlights
Micro surfacing (MS) is one of the techniques applied to pavement preventive maintenance, with good results when used in heavy traf ic highways
In order to select the grain size, it was decided to use the materials included in band II DNIT speci ications for MS (Figure 8), which is the most adopted particle size distribution range used by the Brazilian road agencies
For the steel slag aggregate (SSA), the type used in this study was iron slag and it is important to mention that they were cured for 8 months with water injections and the percentage of slag on MS with SSA was 100%
Summary
Micro surfacing (MS) is one of the techniques applied to pavement preventive maintenance, with good results when used in heavy traf ic highways. According to Hein et al (2003) and from the association of asphalt emulsion manufacturers (AEMA), the MS can be employed as an alternative to hot asphalt mixture to correct pavement rutting. According to Loiola (2009), certain types of alternative aggregates have been applied to paving. The use of SSA has already been carried out in the pavement community since the 1990s as granular material for base and subbase and as aggregate for asphalt layer applications, studies that analyze the behavior of SSA in MS applications are still incipient in Brazil. As cited by Rohde (2002) SSA has in the presence of oxides such as CaO and MgO in its composition These oxides have an expansive feature due to chemical reactions. According to Teixeira et al (2019) the SSA expansive effects could be minimized too when combined with other asphalt mixture components
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