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From page 59... ... 59 5.1 Introduction This chapter focuses on the aggregate-related pavement performance records and how quality may be linked to the behavior of individual pavement layers under traffic loading and environmental conditions. This includes effects of aggregate quality and source issues on strength, modulus, permanent deformation, and durability characteristics of bound and unbound layers in constructed pavement structures. Read the entire page →
From page 60... ... 60 Aggregate Quality Requirements for Pavements Chemical propertiesPhysical properties Mechanical properties Table 5-1. Recycled aggregates source properties that can influence pavement performance. Read the entire page →
From page 61... ... Aggregate Quality Affecting Pavement Performance 61 (3) fine aggregate angularity, and (4) Read the entire page →
From page 62... ... 62 Aggregate Quality Requirements for Pavements Moaveni et al. Read the entire page →
From page 63... ... Aggregate Quality Affecting Pavement Performance 63 are not readily available. According to the cost-effectiveness and performance records collected, pavement performance could be increased by 1.4 to 1.9 times by using harder aggregates conforming to the Nordic abrasion specification (Frith et al. Read the entire page →
From page 64... ... 64 Aggregate Quality Requirements for Pavements distresses in PCC pavements. According to Hanna (2003) Read the entire page →
From page 65... ... Aggregate Quality Affecting Pavement Performance 65 Pavement type Performance parameter Manifestation Aggregate propertiesPCC propertiesMechanisms Table 5-5. Concrete pavement performance parameters and the corresponding aggregate properties. Read the entire page →
From page 66... ... 66 Aggregate Quality Requirements for Pavements procedure called the hydraulic fracture test was developed as part of the Strategic Highway Research Program. This test procedure requires eight working days rather than eight weeks to complete. Read the entire page →
From page 67... ... Aggregate Quality Affecting Pavement Performance 67 5.2.3 Unsurfaced Pavements The Massachusetts Unpaved Roads Best Management Practices Manual: A Guidebook on How to Improve Water Quality While Addressing Common Problems describes the main distresses in unpaved roads as surface deteriorations and surface deformations. Deterioration can be caused by losing fine materials to the air as dust or losing coarse aggregates from raveling. Read the entire page →
From page 68... ... 68 Aggregate Quality Requirements for Pavements is 12 respondents. Refer to Appendix C for a detailed compilation related to individual responses reported by each agency. Read the entire page →
From page 69... ... Aggregate Quality Affecting Pavement Performance 69 is related to stripping and permanent deformation; (8) micro-deval test is related to potholes, raveling, and popouts; and (9) Read the entire page →
From page 70... ... 70 Aggregate Quality Requirements for Pavements layers constructed using these aggregates are likely to undergo significant changes in gradation during compaction and subsequently under traffic loading (Tutumluer 2013) Read the entire page →
From page 71... ... Aggregate Quality Affecting Pavement Performance 71 Furthermore, Pan et al. Read the entire page →
From page 72... ... 72 Aggregate Quality Requirements for Pavements size distribution or decrease in coarse-to-fine fraction ratio (Gatchalian et al. Read the entire page →
From page 73... ... Aggregate Quality Affecting Pavement Performance 73 5.4 Performance Concerns of Recycled and Artificial/Byproduct Aggregates Several limitations exist for using QB as aggregates in pavement applications, mainly due to performance concerns and other logistical factors. NCHRP Synthesis 435: Volume 4 lists some of the performance concerns for using QB: (1) Read the entire page →
From page 74... ... 74 Aggregate Quality Requirements for Pavements Findings from the Transportation Pooled Study TPF-5(129) Read the entire page →
From page 75... ... Aggregate Quality Affecting Pavement Performance 75 expansion test either by the DOT or by the supplier (Illinois, Indiana, Minnesota, Ohio, South Carolina, and West Virginia) and some states required moisture curing prior to use. Read the entire page →
From page 76... ... 76 Aggregate Quality Requirements for Pavements concluded that the use of SFS was safe and did not induce any contamination even in areas where the groundwater table was shallow. Participating transportation agencies indicated whether they have any environmental (e.g., leaching) Read the entire page →

From page 59...

... 59 5.1 Introduction This chapter focuses on the aggregate-related pavement performance records and how quality may be linked to the behavior of individual pavement layers under traffic loading and environmental conditions. This includes effects of aggregate quality and source issues on strength, modulus, permanent deformation, and durability characteristics of bound and unbound layers in constructed pavement structures.