The Use of Milled Bituminous Material in The Use of Milled Bituminous Material in Fung, Eduardo - COBA, S.A. Baptista, Teresa - ALBERTO COUTO ALVES, S.A. Quintão, António - COBA, S.A.
1 INTRODUCTION 2 METHODOLOGY 2.1 BASIC APPROACH 2.2 ALTERNATIVE PAVEMENT STRUCTURAL ANALYSIS 2.3 FWD TESTS RESULTS 3 PROPERTIES OF THE MILLED BITUMINOUS MATERIAL. COMPACTION PROCEDURE. 4 - FINAL CONSIDERATIONS
1 INTRODUCTION LARGE QUANTITIES OF MILLED BITUMINOUS MATERIAL (MBM) ARE GENERATED IN ROAD PAVEMENT MAINTENANCE AND REHABILITATION ACTIVITIES; A SIGNIFICANT PERCENTAGE IS TAKEN TO DEPOSIT WITH NEGATIVE IMPACTS (e.g. COST AND ENVIRONMENTAL) ; A PAVEMENT STUDY USING MILLED BITUMINOUS MATERIAL IN CAPPING LAYER WAS CARRIED OUT FOR THE DESIGN PAVEMENT STRUCTURE FOR ALTERNATIVE ROAD TO NR 103-1 IN PORTUGAL
1 INTRODUCTION DESIGN FLEXIBLE PAVEMENT STRUCTURE (DP): AC WEARING COURSE 5 cm DENSE BITUMEN MACADAM BINDER COURSE 9 cm CRUSHED STONE BASE COURSE 15 cm CRUSHED STONE SUB-BASE COURSE 15 cm GRANULAR CAPPING LAYER 15 cm
1 INTRODUCTION PROPOSED ALTERNATIVE STRUCTURE (AP): AC WEARING COURSE 5 cm DENSE BITUMEN MACADAM BINDER COURSE 9 cm CRUSHED STONE BASE COURSE 20 cm MILLED BITUMINOUS CAPPING LAYER 25 cm
2.1 BASIC APPROACH a) AP BEARING CAPACITY EQUIVALENT TO DP CRITICAL STRAINS AP DP b) FIELD TESTS TO ASSESS OVERALL E MODULUS FOUNDATION PLATFORM c) MILLED BITUMINOUS MATERIAL COMPLY WITH NATIONAL LABORATORY SPECIFICATION E474-2006
2.2 ALTERNATIVE PAVEMENT STRUCTURAL ANALYSIS DESIGN PAVEMENT ANALYSIS Thickness E Modulus Poisson Tensile Compressive (cm) (MPa) Coef. Strain Strain AC Wearing Course 5 5 700 0,35 DBM Binder Course 9 6 100 0,35 1.9x10-4 (**) Foundation Platform Crushed Stone Base 15 250 0,35 Crushed Stone Sub-base 15 150 0,40 Granular Capping Layer 15 4.67x10-4 (***) 80 (*) 0,45 (*) Soil - (*) - Overall values below platform level (**) - Asphalt layer bottom interface (***) - Top of foundation platform
2.2 ALTERNATIVE PAVEMENT STRUCTURAL ANALYSIS ALTERNATIVE PAVEMENT ANALYSIS ThicknessE Modulus Poisson Tensile Compressive (cm) (MPa) Coef. Strain Strain AC Wearing Course 5 5 700 0,35 Foundation Platform DBM Binder Course 9 6 100 0,35 1.87x10-4 (**) Crushed Stone Base 20 220 0,40 Milled Bituminous Material 25 4.30x10-4 (***) 120 (*) 0,45 (*) Soil - (*) - Overall values below platform level (**) - Asphalt layer bottom interface (***) - Top of foundation platform
2.3 FWD TESTS RESULTS E Modulus assigned to foundation platform according to the characteristic deflection values corresponding to 85 percentile (D 85% ) Loading Impact: 20kN Plate Diameter: 0,450m Tested Layer E (MPa) 60 70 80 90 100 110 120 Capping layer D 85% (µm) 660 560 490 440 390 360 330
2.3 FWD TESTS RESULTS 2 alignments on test section: D 85% Alig 1= 277µm ; D 85% Alig 2 = 296µm
3 PROPERTIES OF THE MILLED BITUMINOUS MATERIAL
3 PROPERTIES OF THE MILLED BITUMINOUS MATERIAL Result Reference Value LNEC 474 Maximum Particle Size: 31,5 mm (Dmax) MAT1 Dmax 150 mm MAT2 Dmax 80 mm Maximum Fines Content: 1,9% (LNEC E 196) MAT1 10% MAT2 10% Shaliness: 0,02 / 100g MAT1 VBS < 0,20 g/100g (NF P 94-068) MAT2 VBS < 0,10 g/100g
3 PROPERTIES OF THE MILLED BITUMINOUS MATERIAL Result Reference Value LNEC 474 Specification Resistance to Fragmentation: LA = 18,3% LA 45 (NP EN 1097-2) Resistance to Wear: MDE = 10,2% (NP EN 1097-1) MDE 45 Result Reference Value LNEC 474 Specification Sulphate Content (NP EN 1744-1) = 0,02% 0,70%
3 PROPERTIES OF THE MILLED BITUMINOUS MATERIAL FIELD COMPACTION: - NO TYPICAL COMPACTION CURVE; - REFERENCE DENSITY OBTAINED BY PROGRESSIVE NUMBER OF PASSAGES WITH INCREMENTS OF MOISTURE CONTENT; - MAX. DENSITY- 1.95 gr/cm 3 ; OPC 10%; RELATIVE COMPACTION: 97 TO 99%
4 - FINAL CONSIDERATIONS MILLED BITUMINOUS MATERIAL CAN BE USED WITH ADVANTAGE IN ROAD PAVEMENT CONSTRUCTION; FWD TESTS CONFIRMED GOOD PERFOMANCE AND BEARING CAPACITY OF THE MBM CAPPING LAYER; PROPERTIES OF MBM WERE PROPERLY CHARACTERIZED; COMPACTION PROCEDURE WAS DEFINED IN TEST SECTION; USE OF MBM IN ROAD CONSTRUCTION SHOULD BE ENCOURAGED AS A GOOD ENVIRONMENTAL CONTRIBUTION FOR SUSTAINABLE ROAD CONSTRUCTION.