workshop direct-mat-lnec casos de estudo ra...(pombal) @@ title application of hot mix asphalt with...
TRANSCRIPT
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Casos de estudo
Reciclagem de misturas betuminosas
Maria de Lurdes AntunesLNEC
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Objectivo�Recolha de experiências de obras de reciclagem
• Elementos difíceis de encontrar na bibliografia• Aspectos de carácter prático
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• Aspectos de carácter prático• Desconstrução e processamento do material recuperado• Formulação e características de desempenho dos materiais• Características das camadas a curto prazo• Características a longo prazo
Informações para os manuais de boas práticas
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Misturas betuminosas recicladasResumo dos casos de estudo
Reciclagem
3
Desconstru-
ção
de materiais
não ligados
ou ligados
com cimento
Misturas a
quente em
central
Misturas
temperadas
em central
Misturas a
frio em
central
Misturas a
quente in situ
Misturas a
frio in situ
5 1 12 1 5 6 16
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Casos de estudo PortugalCS Tipo Título
CS 4.20 A quente, em central
Application of Hot Mix Asphalt with 35% - 40% Reclaimed
Asphalt in the rehabilitation of the pavement of the National road
EN 105 between Travagem and Santo Tirso (Portugal)
4
EN 105 between Travagem and Santo Tirso (Portugal)
CS 4.21 A quente, em central
Application of Hot Mix Asphalt with 20% - 25% Reclaimed
Asphalt in the rehabilitation of the pavement of the motorway A1
between Pombal and Condeixa (Portugal)
CS 4.22 A frio, in situ Cold In-situ Recycling of the Pavement of EN 260 between km
40+200 and km 58+000
CS 4.23 A frio, in situ Rehabilitation of the IP2 Pavement between Barragem do Fratel
and EN 118 (Portugal) using Cold In-situ Recycling of Existing
Asphalt Layers
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CS 4.20EN 105 (Sto Tirso)
@@Title Application of Hot Mix Asphalt with 35% - 40% Reclaimed Asphaltin the rehabilitation of the pavement of the National road EN 105between Travagem and Santo Tirso (Portugal)
@@Abstract This case study refers to the first known application of RAP in theproduction of hot mix asphalt concrete in Portugal. It concerns theapplication of a plant hot mix recycled asphalt concrete as a bidercourse in one road stretch located in the North of Portugal.
@@Country Country where the information originates from (multiple choice
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Country Country where the information originates from (multiple choicepossible):• Portugal
@@Demolition product • Bituminous bound material@@New material • Bituminous bound material@@Demolished part of the construction
• Surface course• Binder course• Base course
@@New layer(s) • Binder course@@Year of the work 1999 - 2000@@Coordinates@@Quantity of reclaimed material@@Mean recycling rate (% by mass)
35 % - 40 %
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EN 105Características do RA
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Property
Stockpile no. 1 Stockpile no. 2
Sample 1.1(1)
Sample 1.2(1)
Sample 1.3(1)
Sample 1.4(1)
Sample 2.1(1)
Sample 2.2(1)
Reclaimed binder content, % 6,1 4,3 5,0 4,7 6,4 5,9
Reclaimed Asphalt Pavement from stockpile no. 2
Pen = 15
TAB = 68
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EN 105Fabrico da mistura
Property ValuePercent of added reclaimed asphalt, %
40
7
Mix composition
reclaimed asphalt, %Percent of added virgin binder, %
3,5
Total binder content (“Kumagawa” extraction procedure)
5,3 %
Marshall test (50 blows)
Stability 8,9 kNFlow 3,1 mmMarshall quotient 3,0 kN/mmSpecimens bulk density 2,35 Mg/m3
Specimens porosity 4,7 % Central contínua com anel de introdução do RA
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EN 105Propriedades de desempenho
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CS 4.21A1 (Pombal)
@@Title Application of Hot Mix Asphalt with 20% - 25% Reclaimed Asphalt inthe rehabilitation of the pavement of the motorway A1 betweenPombal and Condeixa (Portugal)
@@Abstract This case study refers to plant hot mix recycling works in the frame ofthe rehabilitation of a stretch of the motorway A1, located in thecentre of Portugal.It concerns the use of 20% - 25% of Reclaimed Asphalt in theproduction of two different asphalt concrete mixtures for applicationin binder courses.
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@@Country Country where the information originates from (multiple choicepossible):• Portugal
@@Demolition product • Bituminous bound material@@New material • Bituminous bound material@@Demolished part of the construction
• Surface course• Binder course
@@New layer(s) • Binder course@@Year of the work 2004 - 2005@@Coordinates@@Quantity of reclaimed material@@Mean recycling rate (% by mass)
20 % - 25 %
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CS 4.22EN 260 (Serpa)
@@Title Cold In-situ Recycling of the Pavement of EN 260 between km 40+200and km 58+000 (Portugal)
@@Abstract This case study refers to an application of cold in situ recycling of an oldasphalt pavement using bitumen emulsion.The rehabilitation works were performed in 2 phases: The first phaseconsisted in recycling the existing asphalt and granular layers up to 120mm deep and application of a slurry surfacing. The second phaseconsisted in placing a asphalt cold mix binder course and a new slurrysurfacing.
@@Country Country where the information originates from (multiple choice possible):• Portugal
10
@@Demolition product • Bituminous bound material• Unbound granular material
@@New material • Bituminous bound material@@Demolished part of the construction
• Surface course• Base course
@@New layer(s) • Binder course• Base course
@@Year of the work 1998@@Coordinates@@Quantity of reclaimed material
Approximately 33 000 ton
@@Mean recycling rate (% by mass)
100 %
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CS 4.23IP2 (Portalegre)
@@Title Rehabilitation of the IP2 Pavement between Barragem do Fratel and EN118 (Portugal) using Cold In-situ Recycling of Existing Asphalt Layers
@@Abstract This case study refers to a successful application of cold in situ recyclingof asphalt layers from a heavily cracked pavement using bitumenemulsion.A new hot mix asphalt binder course and a new wearing course wereplaced on the recycled layer.
@@Country Country where the information originates from (multiple choice possible):• Portugal
11
• Portugal
@@Demolition product • Bituminous bound material@@New material • Bituminous bound material@@Demolished part of the construction
• Surface course• Base course
@@New layer(s) • Base course@@Year of the work 2002@@Coordinates@@Quantity of reclaimed material
Approximately 34 000 ton
@@Mean recycling rate (% by mass)
100 %
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IP2Características dos RA
90
100 Fuso granulométrico - CE obra
MF1 (sem extracção de betume)
MF2 após extracção de betume
MF3 (sem extracção de betume)
12
0
10
20
30
40
50
60
70
80
0,01 0,1 1 10 100
Dimensão da malha dos peneiros (mm)
Ma
teria
l que
pa
ssa
(%
)
MF3 (sem extracção de betume)
MF4 após extracção de betume
MF5 (sem extracção de betume)
Fuso granulométrico (PG4-Art.20) - Espanha
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IP2Fabrico da mistura
100 Fuso granulométrico - CE obra
13
0
10
20
30
40
50
60
70
80
90
100
0,01 0,1 1 10 100
Dimensão da malha dos peneiros (mm)
Ma
teria
l que
pa
ssa
(%
)
Curva granulométrica semextracção de betume (14 amostras)
Curva granulométrica apósextracção de betume (8 amostras)
Fuso granulométrico (PG4-Art.20) -Espanha
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IP2Controlo da compactação
2,400
2,500 Valores determinados com o Troxler 3450
Valores determinados pelo método da "garrafa de areia"
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1,500
1,600
1,700
1,800
1,900
2,000
2,100
2,200
2,300
2,400
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Locais ensaiados
Ba
rida
de s
eca
(g
/cm
3)
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IP2Características dos ligantes
Binder samples Properties
Penetrtion R&B
softening
15
Identification% old
binder”% new binder
Penetrtion (25ºC, 100g, 5s), 0.1 mm
(ASTM D 5)
softeningpoint, ºC
(ASTM D 36)
Bitumen recovered from the RA
100 - 15 77,6
Bitumen extracted from the emulsion
- 100 77 -
Bitumen recovered from the recycled mixture
≈72 ≈28 32 62,6
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Desconstrução�Fresagem por camadas individuais, se possível
�Separação dos materiais por fracções
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�Separação dos materiais por fracções• Melhor controlo da granulometria• Maior homogeneidade das misturas, não
só relativamente à granulometria mas também ao teor em betume
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Reciclagem a quente em central 1/2�Mistura recuperada:
� Aplicação de 10 a 70 %� RA proveniente de camadas de desgaste ou de desgaste +
regularização
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regularização� RA com betumes convencionais, betumes moles e PMB
�Fabrico� Centrais contínuas ou descontínuas� Com ou sem disposições especiais para reciclagem� Betume novo convencional, modificado ou com rejuvenescedores
�Aplicação� Camadas de base, regularização e desgaste� Diversos tipos de estrada
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Reciclagem a quente em central 2/2�Aplicação de elevadas taxas de incorporação de RA implica investimentos em
� Equipamento� Caracterização do RA
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� Caracterização do RA� Homogeneização
�Pode ser aplicada em camadas com elevadas exigências de desempenho
�Não há problemas específicos com a reciclagem de misturas com betumes modificados com polímeros ou com borracha
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Reciclagem a frio em central ou in situ�Reciclagem a frio em central
� Melhor controle da homogeneidade da mistura� Maiores custos de transporte
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�Ligantes utilizados na reciclagem a frio: emulsão ou espuma de betume, com ou sem cimento
�Obras de reciclagem in situ a frio incluem camada de desgaste sobre camada reciclada
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Obrigada pela atenção!
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