INFLUENCE OF COMPACTION AND dspace-unipr. WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT

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Text of INFLUENCE OF COMPACTION AND dspace-unipr. WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

INFLUENCE OF COMPACTION AND MATURATION TIME ON COLD-RECYCLED ASPHALT PAVEMENTS WITH

FOAMED BITUMEN AND CEMENT

Thursday 28 June 2007 University of LAquila Faculty of Engineering

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

ASPHALT PAVEMENTS DEGRADEREASONS

1) ENVIRONMENTAL FACTORS

thermal excursions

water presence

solar action (UV ray)

load entity

number of passages

1) TRAFFIC LOAD

EFFECT

Ramified cracks Holes Deformations

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

Operation Type

Traditional Method RECYCLING

Milling operation Putting the milled asphalt concrete into dump Hot mix asphalt spread out with virgin aggregates taken from quarry

ROAD PAVEMENTS MAINTENANCE

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

Operation Type

Traditional Method RECYCLING

HOT RECYCLING COLD RECYCLING

Heating milled asphalt(more energy and smoke emission)

ROAD PAVEMENTS MAINTENANCE

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

Operation Type

Traditional Method RECYCLING

HOT RECYCLING COLD RECYCLING

BituminousEmulsions

FOAMEDBITUMEN

ROAD PAVEMENTS MAINTENANCE

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

FOAMED BITUMEN

The foamed bitumen is obtained by a process carried out inside an

expansion room in which both the hot bitumen (170-180 C) and a little

quantity of water (1-2 % of the bitumen weight) that is introduced at environmental temperature and at a

pressure of 10-12 bars, are sprinkled. Such process produces a foamy

product that expands remarkably up to 15-20 times in comparison to the

bitumen initial volume.

Foaming process Expansion room Hot Bitumen

ColdWater

Foamed Bitumen

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

The foam produced dissolves in less than one minute and the binder regains its initial properties. Therefore, the bitumen must

immediately be mixed to the aggregate.

FOAMING PROCESS

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

RECYCLING WITH FOAMED BITUMEN

Speed of advancement: v = 8 15 Km/ h

Production

180 300 m3/ h

Binder (160 180C)

Water (3-4 % of the RAP weight)Foamed water

(1-2 % of the bitumen weight)

ROTOR OF MILLING-MIXING

direction of work

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

RECYCLING WITH FOAMED BITUMEN

Deep Recycling

(15 25 cm)

CATEGORIES OF COLD RECYCLINGSuperficial

Recycling (5 10 cm)

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

RECYCLING WITH FOAMED BITUMEN

Recycling machine

Bitumen tanker

Water tanker

Roller machine Grader

RECYCLING TRAIN

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

EXPERIMENTAL PHASES

Works performed in site

Laboratory survey

Investigation on the specimens taken from the site

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

INDIRECT TENSILE TESTS

Tension state of the specimens

The instruments scheme

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

0%

20%

40%

60%

80%

100%

120%

140%

160%

Duttilit 49% 14% 0% 76% 50% 36% 100% 93% 61%

Resistenza 38% 85% 100% 55% 84% 87% 0% 46% 64%

C1-B2 C2-B2 C3-B2 C1-B3 C2-B3 C3-B3 C1-B4 C2-B4 C3-B4

THE OPTIMAL MIXTURE

Good compromise between development of elevated Resistances and good values of Ductility

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

INVESTIGATION ON THE SPECIMENS WITHDRAWN IN SITE

Objective

To evaluate the influence of the compaction degree on the mechanical properties of the mixtures (4 and 8 passages of roller

compactor and Marshall compactor in laboratory);

To evaluate the influence of the maturation time on the mechanical performances of the mixtures (3, 7 and 28 days).

The purposes of this study are:

Way

Indirect Tensile Tests

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

INDIRECT TENSILE STRENGTH

Rt

0,00

0,10

0,20

0,30

0,40

0,50

0,60

0,70

0,80

Specimens

Rt (

N/m

m2 )

Rt (03days) 0,25 0,36 0,27 0,42 0,31 0,43

Rt (07days) 0,30 0,38 0,31 0,45 0,32 0,56

Rt (28days) 0,53 0,69 0,62 0,72 0,52 0,63

BM Site 4 SF Site 4 BM Site 8 SF Site 8 BM Site-Lab SF Site-Lab

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

TIME INFLUENCE ON THE INDIRECT TENSILE STRENGTH

Rt - TEMPO

0,0

0,1

0,2

0,3

0,4

0,5

0,6

0,7

0,8

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Time (days)

Rt (

N/m

m2 )

SF Site 4 SF Site 8 SF Site-Lab SF Site 4 SF Site 8 SF Site-Lab

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

MATURATION VELOCITY OF THE MIXTURES

VELOCITA DI MATURAZIONE

0,000

0,002

0,004

0,006

0,008

0,010

0,012

0,014

0,016

Works

d(R

t)/d

t

BASE - MODIFICA 0,0112 0,0122 0,0084

SUPERFOAM 0,0138 0,0123 0,0062

Site 4 Site 8 Site-Lab

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture Viarie

CONCLUSIONS

CONCLUSIONI

The mixtures compacted with lower energy (4 roller passages) are featured by a maturation velocity higher than that of mixtures

compacted with higher energy (8 roller passages).

Is this a good thing? What are their fatigue behaviors?

THESE ARE MY QUESTIONS

INTERNATIONAL WORKSHOP ASPHALT RECYCLING AND MATERIALS RE-USE IN ASPHALT PAVEMENTS

Prof. Sandro Colagrande University of LAquila Societ Italiana Infrastrutture ViarieThank you for the attention

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