Drainage Layer 94% All Sub-Base 94% Cement Stabilised Basecourse 96% Lime Stabilised Basecourse 96% Bitumen Stabilised Limestone 98% Basecourse Crushed Rock Base Basecourse 99% Hydrated Cement Treated 99% Crushed Rock Base Basecourse Other Basecourse Materials 96% or 98% (final surfacing sprayed seal) – (Select appropriate value then delete this note. Refer to Guidance Notes) Basecourse Materials (final 98% surfacing asphalt) – DRYBACK OF PAVEMENT LAYERS Pavement Layers shall be dried back to the requirements shown in Table 501A2 or Table 501A3 prior to the application of bituminous binder or the construction of the overlying layer. TABLE 501A2 DRYBACK ON SUBGRADE OR SUB-BASE LAYERS Maximum Dryback Subgrade or Pavement Characteristic Moisture Content Layers (DMc) as a proportion of Optimum Moisture Content 150mm below Subgrade 85% surface (except for Perth sand) Drainage Layer Not required Sub-Base 85% TABLE 501A3 BASECOURSE DRYBACK Maximum Dryback Characteristic Moisture Content Basecourse Material Type (DMc) as a proportion of Optimum Moisture Content
Drainage Layer 94% All Sub-Base 94% Cement Stabilised Basecourse 96% Lime Stabilised Basecourse 96% Bitumen Stabilised Limestone Basecourse 98% Crushed Rock Base Basecourse 99% Hydrated Cement Treated Crushed Rock Base Basecourse 99% Other Basecourse Materials (final surfacing – sprayed seal) 96% or 98% (Select appropriate value then delete this note. Refer to Guidance Notes) Basecourse Materials (final surfacing – asphalt) 98% DRYBACK OF PAVEMENT LAYERS Pavement Layers shall be dried back to the requirements shown in Table 501A2 or Table 501A3 prior to the application of bituminous binder or the construction of the overlying layer. TABLE 501A2 DRYBACK ON SUBGRADE OR SUB-BASE LAYERS Subgrade or Pavement Layers Maximum Dryback Characteristic Moisture Content (DMc) as a proportion of Optimum Moisture Content 150mm below Subgrade surface (except for Perth sand) 85% Drainage Layer Not required Sub-Base 85% TABLE 501A3 BASECOURSE DRYBACK Basecourse Material Type Maximum Dryback Characteristic Moisture Content (DMc) as a proportion of Optimum Moisture Content
Specification%20%20501%20Pavements%20%2029%20June%202018.RCN-D18^23564355.DOCX