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Papers by Aurelio Marchionna

Research paper thumbnail of Evaluation of Pavement Characteristics Using the FWD and Remaining Life Prediction in Terms of Cracked Area --Bearing Capacity of Roads and Airfields. Proceedings of the 2ND International Conference, Plymouth, England, September 16-18, 1986

In this paper a procedure is presented to evaluate the remaining life of both flexible and semi-r... more In this paper a procedure is presented to evaluate the remaining life of both flexible and semi-rigid pavement, from tests carried out with the fwd. The pavements are schematized as an elastic four layer body. For the bituminous and hydraulic bound layers, a linear elastic law was adopted whilst a non-linear elastic law was used for the unbound layers (subbase and subgrade). The behaviour of a very large number of pavements under fwd loading was analysed using a finite element model. These pavements consist of layers of different thickness and modulus, chosen from a very large range. From this analysis and using the multiple regression technique it was possible to find analytical functions between deflections and moduli. The developed procedure permits an evaluation of the pavement layers moduli using these functions and the deflections measured under the fwd load (pastrev program). A bituminous layer fatigue distress model was also developed that takes into account the crack propag...

Research paper thumbnail of Development of a method of static compaction for the preparation of a butuminous concrete samples for dynamic creep testing A.MARCHIONNA and G.ROSSI Department of Hydraulics, Transportation and Roads, Rome University, Italy

Mechanical Tests for Bituminous Mixes - Characterization, Design and Quality Control, 1990

The present study follows the trend of the general practice and, in particular has as its purpose... more The present study follows the trend of the general practice and, in particular has as its purpose the identification of a method of preparation for dynamic creep test samples which dispenses with the need for special equipment and is at the same time reliable. A method of static compaction for the preparation of the representative test samples with aggregates of different natures (crushed and rounded) based on the ASTN norms, different from that first adopted, was finalized.

Research paper thumbnail of Comite Technique Des Routes Souples - Rapport - VIII - Reutilisation Des Materiaux Bitumineux - Recyclage

CE CHAPITRE PRESENTE, OUTRE LES AVANTAGES ECONOMIQUES, UNE ANALYSE DE L'INCIDENCE ECOLOGIQUE ... more CE CHAPITRE PRESENTE, OUTRE LES AVANTAGES ECONOMIQUES, UNE ANALYSE DE L'INCIDENCE ECOLOGIQUE DE LA REUTILISATION DES MATERIAUX BITUMINEUX. LES TRAVAUX DU COMITE SUR L'AMELIORATION DE LA TERMINOLOGIE DE CES OPERATIONS SONT EGALEMENT PRESENTES. LES TECHNIQUES EMPLOYEES SONT DE DEUX TYPES QUI DIFFERENT SELON LA PROPORTION DE MATERIAUX ANCIENS ASSOCIES AUX NOUVEAUX MATERIAUX POUR LA MISE EN OEUVRE. CES METHODES SONT: -1- LA RESTAURATION ( THERMOREPROFILAGE, THERMOREGENERATION OU AUSSI RESTAURATION A FROID ) POUR LA COUCHE DE ROULEMENT -2- LE RECYCLAGE POUR LES AUTRES COUCHES DE LA CHAUSSEE. LES CARACTERISTIQUES DES MATERIAUX DE RECUPERATION OU D'ADJONCTION SONT ENSUITE ANALYSEES. LA COMPOSITION DU MELANGE ET L'EPAISSEUR A METTRE EN OEUVRE SONT EGALEMENT DECRITES DANS CE CHAPITRE. ENFIN LES PROBLEMES POSES PAR LE STOCKAGE ET LE MALAXAGE AINSI QUE LES CONTROLES A UTILISER POUR TOUTES CES OPERATIONS FONT L'OBJET DE REMARQUES QUI CONSTITUENT LE DERNIER PARAGRAPHE. (VOIR ...

Research paper thumbnail of Airport PMS Based on a New Structural Deterioration Model

A new Pavement Management System called "AIRPMS" (AIRport Pavement Management System) w... more A new Pavement Management System called "AIRPMS" (AIRport Pavement Management System) with a related software for Windows has been developed for airport pavements. This PMS is based on specific procedures for input data processing, structural deterioration models, structural performance of maintenance strategies, and optimization algorithms. Pavements are divided into sections with homogeneous typology, subgrade, traffic and history. The optimization model is "disaggregated": maintenance strategy is definited for every homogeneous section, using a new structural deterioration model. If historical data on pavement condition are available, it's possible to fit the structural deterioration curves to the effective performance of pavements, and develop appropriate maintenance strategies. For the covering abstract see ITRD E108018.

Research paper thumbnail of The road CADASTER project in Italy

Research paper thumbnail of Comite Technique Des Routes Souples - Rapport - VI - Materiaux Non Traditionnels - Produits De Recuperation

LE CHAPITRE VISE A DECRIRE L'EMPLOI ACTUEL DANS LES CHAUSSEES SOUPLES DES MATERIAUX NON TRADI... more LE CHAPITRE VISE A DECRIRE L'EMPLOI ACTUEL DANS LES CHAUSSEES SOUPLES DES MATERIAUX NON TRADITIONNELS NATURELS ET DES PRODUITS DE RECUPERATION (SOUS-PRODUITS INDUSTRIELS ET DECHETS), SOIT AU LIEU DES GRANULATS TRADITIONNELS, SOIT COMME LIANTS HYDRAULIQUES OU COMME FINES D'APPORT DANS LES ENROBES BITUMINEUX. IL A ETE REDIGE GRACE A UNE ENQUETE AUPRES DES PAYS MEMBRES, A LAQUELLE QUATORZE PAYS ONT REPONDU. L'EMPLOI DE GRANULATS NON TRADITIONNELS, D'ORIGINE NATURELLE OU DE DECHETS OU DE SOUS-PRODUITS INDUSTRIELS, SE JUSTIFIE PAR L'APPAUVRISSEMENT DES RESSOURCES EN GRANULATS TRADITIONNELS ET PAR DES OBJECTIFS DE PRESERVATION DE L'ENVIRONNEMENT. CEPENDANT L'EMPLOI DES GRANULATS NON TRADITIONNELS NE DOIT PAS SE FAIRE AU DETRIMENT DE LA QUALITE DES OUVRAGES. (VOIR AUSSI FICHE GENERALE DU RAPPORT DU CT8, DIRR 121908).

Research paper thumbnail of P.C.P., Multifunctional Composite Pavement

Research paper thumbnail of Banque De Donnees, Tunnels Routiers et Modele D'Analyse Structurale Des Revetements Degrades. Experience Acquise Dans La Gestion De La Manutention Des Tunnels Autoroutiers

La gestion des tunnels routiers du reseau de la Societe AUTOSTRADE s'effectue depuis quelques... more La gestion des tunnels routiers du reseau de la Societe AUTOSTRADE s'effectue depuis quelques annees avec l'aide de programmes informatiques de saisie et de gestion des informations dans le cadre d'un projet specifique denomme MAGA (MANUTENZIONE GALLERIE AUTOSTRADALI - ENTRETIEN DES TUNNELS AUTOROUTIERS). Dans cette etude les auteurs presentent sommairement la partie relative au recueil des donnees, qui est actuellement tout a fait operationnelle tous les criteres de codification ayant deja ete definis. Puis les auteurs mettent l'accent sur les aspects lies a la gestion des informations et au developpement aussi bien de programmes de controle structural que de technique speciales de surveillance.

Research paper thumbnail of Comite Technique Des Routes Souples - Rapport - VII - Techniques De Regeneration et De Recyclage

APRES UN RAPPEL DES DEFINITIONS, MAINTENANT BIEN CONNUES, DES DIFFERENTS PROCEDES DE RECYCLAGE, C... more APRES UN RAPPEL DES DEFINITIONS, MAINTENANT BIEN CONNUES, DES DIFFERENTS PROCEDES DE RECYCLAGE, CE CHAPITRE PRESENTE UNE METHODOLOGIE (IL S'AGIT EN FAIT DE LA METHODOLOGIE FRANCAISE) DE CHOIX EN LABORATOIRE DE LA COMPOSITION DES ENROBES DE RECYCLAGE (DECOUPAGE DU REVETEMENT A RECYCLER EN ZONES DE COMPOSITION HOMOGENE, IDENTIFICATION DE L'ENROBE ET DE SON LIANT, DETERMINATION DE LA NATURE DE LA PROPORTION DE REGENERANT NECESSAIRE, PAR ESSAIS SUR MELANGES DE LIANTS, ESSAIS MECANIQUES DE VERIFICATION SUR L'ENROBE DE RECYCLAGE). L'EVALUATION ECONOMIQUE DES OPERATIONS DE RECYCLAGE EST ABORDEE, DANS L'HYPOTHESE D'UNE EQUIVALENCE TECHNIQUE DES ENROBES DE RECYCLAGE ET DES ENROBES NEUFS. (VOIR FICHES GENERALES DIRR DES RAPPORTS TECHNIQUES 115747 ET DU RAPPORT DU COMITE TECHNIQUE DES ROUTES SOUPLES 115899).

Research paper thumbnail of Influence of the Stress Ratio on the Fatigue Design of Concrete Pavements

It is experimentally established that the fatigue strength of concrete depends on the magnitude o... more It is experimentally established that the fatigue strength of concrete depends on the magnitude of variation between the maximum and minimum stress values applied in a load cycle. To define test conditions in these terms reference is made to a stress value r, derived from the ratio between the maximum and minimum values. Most fatigue laws used in pavement design are based on tests conducted with R approximately equal to 0. This however does not correspond to the effective stress conditions of a concrete pavement in service, since the traffic induced stresses are additional to existing stresses caused by temperature, for which the effective stress cycle ratio r is generally different to 0. This paper presents a fatigue law for the design of concrete pavements which takes account of these considerations. (TRRL)

Research paper thumbnail of Comite Technique Des Routes Souples - Seminaire B - Recyclage Des Enrobes Bitumineux

LE DOCUMENT SE REFERE SOUVENT AU CHAPITRE VIII DU RAPPORT DU COMITE TECHNIQUE DES ROUTES SOUPLES ... more LE DOCUMENT SE REFERE SOUVENT AU CHAPITRE VIII DU RAPPORT DU COMITE TECHNIQUE DES ROUTES SOUPLES (DIRR 121908) ET EST SURTOUT DESTINE A INTRODUIRE LE DEBAT QUI S'EST TENU AU COURS DU SEMINAIRE. LES THEMES PROPOSES A LA DISCUSSION SONT LES SUIVANTS: ASPECTS ECONOMIQUES ET ECOLOGIQUES; DEFINITION ET MOYEN DE REALISER LES OPERATIONS DE RECYCLAGE; PERFORMANCES DES EQUIPEMENTS ET RISQUES DE POLLUTION DES CHANTIERS; FORMULATION DES MELANGES RECYCLES ET CONTROLE DE QUALITE DE CEUX-CI. (VOIR FICHE GENERALE DIRR 121892).

Research paper thumbnail of Concrete Pavement and Compressible Subgrade Soils Compatibility

It is commonly believed that rigid pavements cannot be built on subgrades which are still subject... more It is commonly believed that rigid pavements cannot be built on subgrades which are still subject to vertical movements caused by settlement. There are two types of post constructional settlement : uniform settlement and differential settlement. This paper examines : (1) the effects of the differential settlement of the pavement subgrade. A distinction is made between differential settlement with a wavelength comparable to the length of the concrete slab and settlement with a broader wavelength; (2) the movements of the slab at the joints, due to subgrade deformation, which must be compatible with the type of joint. The joints must allow for the rotation of the two adjoining slabs. This may be possible if the gap between the joints is sufficiently wide; and (3) warping of the slab caused by thermal gradients. It is concluded that the construction of rigid pavements may not be absolutely ruled out but depends on the magnitude of the differential settlements occurring after constructi...

Research paper thumbnail of The Maintenance of Highway Tunnels : Criteria and Methodology

Research paper thumbnail of Considerations on the Structural Behaviour and the Design of Semi Rigid Pavements. Fatigue Analysis and Reflection Cracking

From a calculation of the stresses due to traffic loads, a finite element model is presented for ... more From a calculation of the stresses due to traffic loads, a finite element model is presented for evaluating how the distribution of these stresses is modified by the presence of transverse cracks in the cement bound base. The model is also used to evaluate the damage caused by different axle loads. It is shown that in pavements which conform to the structural behaviour forecast by this model, the ratios between the equivalence coefficients of the loads are significantly different from those adopted for flexible pavements. A model is also presented for evaluating the rate of propagation of reflection cracking in layers of different thicknesses in some rigid pavements.

Research paper thumbnail of Evaluation of flexible pavements and overlay design based on FWD tests

… Conference on the Structural Design of …, 1987

Research paper thumbnail of A Leap in Quality of the Fatigue Strength of Road Pavements. PCP (Polyfunctional Composite Pavement). Behaviour and Structural Design

This paper describes a new type of pavement, pcp (polyfunctional composite pavement), used for th... more This paper describes a new type of pavement, pcp (polyfunctional composite pavement), used for the first time in Italy on the a24-a2 section of the fiano-san cesario bypass. The main contribution to bearing capacity is a continuously reinforced concrete slab. At equal thicknesses of the bound layers the durability of pcp is much superior to that of semirigid pavements. A porous bituminous wearing course is laid on the slab, achieving the following additional functions with regard to traditional wearing courses: reduction of water film, attenuation of tyre noise, and less spray. The composition of pcp and the main objectives for its introduction, its behaviour and the design method used, are described and illustrated.

Research paper thumbnail of Modello di previsione delle velocità praticate dadli utenti attraverso la definizione di una velocità ambientale

XIII convegno nazionale SIIV, 2003

Research paper thumbnail of Considerazioni critiche sull'inserimetno delle curve di raccordo nei tracciati stradali

XII convegno internazionale SIIV - Riqual. funzionale e sicurezza sist. viario, 2002

Research paper thumbnail of Modello di previsione delle velocità praticate dagli utenti attraverso la definizione di una velocità ambientale

Research paper thumbnail of Country Report--Italy: An Overview of National Guidelines and Policies on Highway Geometric Design

… on Highway Geometric …, 2005

Abstract: One of the strongest social costs that Italy pays in terms of mobility arises from the ... more Abstract: One of the strongest social costs that Italy pays in terms of mobility arises from the road accidents. In Italy, it has been estimated that road accident costs are about 2% of the GNP, that is an annual cost of about 30,000 millions of EURO. Italy with other countries of ...

Research paper thumbnail of Evaluation of Pavement Characteristics Using the FWD and Remaining Life Prediction in Terms of Cracked Area --Bearing Capacity of Roads and Airfields. Proceedings of the 2ND International Conference, Plymouth, England, September 16-18, 1986

In this paper a procedure is presented to evaluate the remaining life of both flexible and semi-r... more In this paper a procedure is presented to evaluate the remaining life of both flexible and semi-rigid pavement, from tests carried out with the fwd. The pavements are schematized as an elastic four layer body. For the bituminous and hydraulic bound layers, a linear elastic law was adopted whilst a non-linear elastic law was used for the unbound layers (subbase and subgrade). The behaviour of a very large number of pavements under fwd loading was analysed using a finite element model. These pavements consist of layers of different thickness and modulus, chosen from a very large range. From this analysis and using the multiple regression technique it was possible to find analytical functions between deflections and moduli. The developed procedure permits an evaluation of the pavement layers moduli using these functions and the deflections measured under the fwd load (pastrev program). A bituminous layer fatigue distress model was also developed that takes into account the crack propag...

Research paper thumbnail of Development of a method of static compaction for the preparation of a butuminous concrete samples for dynamic creep testing A.MARCHIONNA and G.ROSSI Department of Hydraulics, Transportation and Roads, Rome University, Italy

Mechanical Tests for Bituminous Mixes - Characterization, Design and Quality Control, 1990

The present study follows the trend of the general practice and, in particular has as its purpose... more The present study follows the trend of the general practice and, in particular has as its purpose the identification of a method of preparation for dynamic creep test samples which dispenses with the need for special equipment and is at the same time reliable. A method of static compaction for the preparation of the representative test samples with aggregates of different natures (crushed and rounded) based on the ASTN norms, different from that first adopted, was finalized.

Research paper thumbnail of Comite Technique Des Routes Souples - Rapport - VIII - Reutilisation Des Materiaux Bitumineux - Recyclage

CE CHAPITRE PRESENTE, OUTRE LES AVANTAGES ECONOMIQUES, UNE ANALYSE DE L'INCIDENCE ECOLOGIQUE ... more CE CHAPITRE PRESENTE, OUTRE LES AVANTAGES ECONOMIQUES, UNE ANALYSE DE L'INCIDENCE ECOLOGIQUE DE LA REUTILISATION DES MATERIAUX BITUMINEUX. LES TRAVAUX DU COMITE SUR L'AMELIORATION DE LA TERMINOLOGIE DE CES OPERATIONS SONT EGALEMENT PRESENTES. LES TECHNIQUES EMPLOYEES SONT DE DEUX TYPES QUI DIFFERENT SELON LA PROPORTION DE MATERIAUX ANCIENS ASSOCIES AUX NOUVEAUX MATERIAUX POUR LA MISE EN OEUVRE. CES METHODES SONT: -1- LA RESTAURATION ( THERMOREPROFILAGE, THERMOREGENERATION OU AUSSI RESTAURATION A FROID ) POUR LA COUCHE DE ROULEMENT -2- LE RECYCLAGE POUR LES AUTRES COUCHES DE LA CHAUSSEE. LES CARACTERISTIQUES DES MATERIAUX DE RECUPERATION OU D'ADJONCTION SONT ENSUITE ANALYSEES. LA COMPOSITION DU MELANGE ET L'EPAISSEUR A METTRE EN OEUVRE SONT EGALEMENT DECRITES DANS CE CHAPITRE. ENFIN LES PROBLEMES POSES PAR LE STOCKAGE ET LE MALAXAGE AINSI QUE LES CONTROLES A UTILISER POUR TOUTES CES OPERATIONS FONT L'OBJET DE REMARQUES QUI CONSTITUENT LE DERNIER PARAGRAPHE. (VOIR ...

Research paper thumbnail of Airport PMS Based on a New Structural Deterioration Model

A new Pavement Management System called "AIRPMS" (AIRport Pavement Management System) w... more A new Pavement Management System called "AIRPMS" (AIRport Pavement Management System) with a related software for Windows has been developed for airport pavements. This PMS is based on specific procedures for input data processing, structural deterioration models, structural performance of maintenance strategies, and optimization algorithms. Pavements are divided into sections with homogeneous typology, subgrade, traffic and history. The optimization model is "disaggregated": maintenance strategy is definited for every homogeneous section, using a new structural deterioration model. If historical data on pavement condition are available, it's possible to fit the structural deterioration curves to the effective performance of pavements, and develop appropriate maintenance strategies. For the covering abstract see ITRD E108018.

Research paper thumbnail of The road CADASTER project in Italy

Research paper thumbnail of Comite Technique Des Routes Souples - Rapport - VI - Materiaux Non Traditionnels - Produits De Recuperation

LE CHAPITRE VISE A DECRIRE L'EMPLOI ACTUEL DANS LES CHAUSSEES SOUPLES DES MATERIAUX NON TRADI... more LE CHAPITRE VISE A DECRIRE L'EMPLOI ACTUEL DANS LES CHAUSSEES SOUPLES DES MATERIAUX NON TRADITIONNELS NATURELS ET DES PRODUITS DE RECUPERATION (SOUS-PRODUITS INDUSTRIELS ET DECHETS), SOIT AU LIEU DES GRANULATS TRADITIONNELS, SOIT COMME LIANTS HYDRAULIQUES OU COMME FINES D'APPORT DANS LES ENROBES BITUMINEUX. IL A ETE REDIGE GRACE A UNE ENQUETE AUPRES DES PAYS MEMBRES, A LAQUELLE QUATORZE PAYS ONT REPONDU. L'EMPLOI DE GRANULATS NON TRADITIONNELS, D'ORIGINE NATURELLE OU DE DECHETS OU DE SOUS-PRODUITS INDUSTRIELS, SE JUSTIFIE PAR L'APPAUVRISSEMENT DES RESSOURCES EN GRANULATS TRADITIONNELS ET PAR DES OBJECTIFS DE PRESERVATION DE L'ENVIRONNEMENT. CEPENDANT L'EMPLOI DES GRANULATS NON TRADITIONNELS NE DOIT PAS SE FAIRE AU DETRIMENT DE LA QUALITE DES OUVRAGES. (VOIR AUSSI FICHE GENERALE DU RAPPORT DU CT8, DIRR 121908).

Research paper thumbnail of P.C.P., Multifunctional Composite Pavement

Research paper thumbnail of Banque De Donnees, Tunnels Routiers et Modele D'Analyse Structurale Des Revetements Degrades. Experience Acquise Dans La Gestion De La Manutention Des Tunnels Autoroutiers

La gestion des tunnels routiers du reseau de la Societe AUTOSTRADE s'effectue depuis quelques... more La gestion des tunnels routiers du reseau de la Societe AUTOSTRADE s'effectue depuis quelques annees avec l'aide de programmes informatiques de saisie et de gestion des informations dans le cadre d'un projet specifique denomme MAGA (MANUTENZIONE GALLERIE AUTOSTRADALI - ENTRETIEN DES TUNNELS AUTOROUTIERS). Dans cette etude les auteurs presentent sommairement la partie relative au recueil des donnees, qui est actuellement tout a fait operationnelle tous les criteres de codification ayant deja ete definis. Puis les auteurs mettent l'accent sur les aspects lies a la gestion des informations et au developpement aussi bien de programmes de controle structural que de technique speciales de surveillance.

Research paper thumbnail of Comite Technique Des Routes Souples - Rapport - VII - Techniques De Regeneration et De Recyclage

APRES UN RAPPEL DES DEFINITIONS, MAINTENANT BIEN CONNUES, DES DIFFERENTS PROCEDES DE RECYCLAGE, C... more APRES UN RAPPEL DES DEFINITIONS, MAINTENANT BIEN CONNUES, DES DIFFERENTS PROCEDES DE RECYCLAGE, CE CHAPITRE PRESENTE UNE METHODOLOGIE (IL S'AGIT EN FAIT DE LA METHODOLOGIE FRANCAISE) DE CHOIX EN LABORATOIRE DE LA COMPOSITION DES ENROBES DE RECYCLAGE (DECOUPAGE DU REVETEMENT A RECYCLER EN ZONES DE COMPOSITION HOMOGENE, IDENTIFICATION DE L'ENROBE ET DE SON LIANT, DETERMINATION DE LA NATURE DE LA PROPORTION DE REGENERANT NECESSAIRE, PAR ESSAIS SUR MELANGES DE LIANTS, ESSAIS MECANIQUES DE VERIFICATION SUR L'ENROBE DE RECYCLAGE). L'EVALUATION ECONOMIQUE DES OPERATIONS DE RECYCLAGE EST ABORDEE, DANS L'HYPOTHESE D'UNE EQUIVALENCE TECHNIQUE DES ENROBES DE RECYCLAGE ET DES ENROBES NEUFS. (VOIR FICHES GENERALES DIRR DES RAPPORTS TECHNIQUES 115747 ET DU RAPPORT DU COMITE TECHNIQUE DES ROUTES SOUPLES 115899).

Research paper thumbnail of Influence of the Stress Ratio on the Fatigue Design of Concrete Pavements

It is experimentally established that the fatigue strength of concrete depends on the magnitude o... more It is experimentally established that the fatigue strength of concrete depends on the magnitude of variation between the maximum and minimum stress values applied in a load cycle. To define test conditions in these terms reference is made to a stress value r, derived from the ratio between the maximum and minimum values. Most fatigue laws used in pavement design are based on tests conducted with R approximately equal to 0. This however does not correspond to the effective stress conditions of a concrete pavement in service, since the traffic induced stresses are additional to existing stresses caused by temperature, for which the effective stress cycle ratio r is generally different to 0. This paper presents a fatigue law for the design of concrete pavements which takes account of these considerations. (TRRL)

Research paper thumbnail of Comite Technique Des Routes Souples - Seminaire B - Recyclage Des Enrobes Bitumineux

LE DOCUMENT SE REFERE SOUVENT AU CHAPITRE VIII DU RAPPORT DU COMITE TECHNIQUE DES ROUTES SOUPLES ... more LE DOCUMENT SE REFERE SOUVENT AU CHAPITRE VIII DU RAPPORT DU COMITE TECHNIQUE DES ROUTES SOUPLES (DIRR 121908) ET EST SURTOUT DESTINE A INTRODUIRE LE DEBAT QUI S'EST TENU AU COURS DU SEMINAIRE. LES THEMES PROPOSES A LA DISCUSSION SONT LES SUIVANTS: ASPECTS ECONOMIQUES ET ECOLOGIQUES; DEFINITION ET MOYEN DE REALISER LES OPERATIONS DE RECYCLAGE; PERFORMANCES DES EQUIPEMENTS ET RISQUES DE POLLUTION DES CHANTIERS; FORMULATION DES MELANGES RECYCLES ET CONTROLE DE QUALITE DE CEUX-CI. (VOIR FICHE GENERALE DIRR 121892).

Research paper thumbnail of Concrete Pavement and Compressible Subgrade Soils Compatibility

It is commonly believed that rigid pavements cannot be built on subgrades which are still subject... more It is commonly believed that rigid pavements cannot be built on subgrades which are still subject to vertical movements caused by settlement. There are two types of post constructional settlement : uniform settlement and differential settlement. This paper examines : (1) the effects of the differential settlement of the pavement subgrade. A distinction is made between differential settlement with a wavelength comparable to the length of the concrete slab and settlement with a broader wavelength; (2) the movements of the slab at the joints, due to subgrade deformation, which must be compatible with the type of joint. The joints must allow for the rotation of the two adjoining slabs. This may be possible if the gap between the joints is sufficiently wide; and (3) warping of the slab caused by thermal gradients. It is concluded that the construction of rigid pavements may not be absolutely ruled out but depends on the magnitude of the differential settlements occurring after constructi...

Research paper thumbnail of The Maintenance of Highway Tunnels : Criteria and Methodology

Research paper thumbnail of Considerations on the Structural Behaviour and the Design of Semi Rigid Pavements. Fatigue Analysis and Reflection Cracking

From a calculation of the stresses due to traffic loads, a finite element model is presented for ... more From a calculation of the stresses due to traffic loads, a finite element model is presented for evaluating how the distribution of these stresses is modified by the presence of transverse cracks in the cement bound base. The model is also used to evaluate the damage caused by different axle loads. It is shown that in pavements which conform to the structural behaviour forecast by this model, the ratios between the equivalence coefficients of the loads are significantly different from those adopted for flexible pavements. A model is also presented for evaluating the rate of propagation of reflection cracking in layers of different thicknesses in some rigid pavements.

Research paper thumbnail of Evaluation of flexible pavements and overlay design based on FWD tests

… Conference on the Structural Design of …, 1987

Research paper thumbnail of A Leap in Quality of the Fatigue Strength of Road Pavements. PCP (Polyfunctional Composite Pavement). Behaviour and Structural Design

This paper describes a new type of pavement, pcp (polyfunctional composite pavement), used for th... more This paper describes a new type of pavement, pcp (polyfunctional composite pavement), used for the first time in Italy on the a24-a2 section of the fiano-san cesario bypass. The main contribution to bearing capacity is a continuously reinforced concrete slab. At equal thicknesses of the bound layers the durability of pcp is much superior to that of semirigid pavements. A porous bituminous wearing course is laid on the slab, achieving the following additional functions with regard to traditional wearing courses: reduction of water film, attenuation of tyre noise, and less spray. The composition of pcp and the main objectives for its introduction, its behaviour and the design method used, are described and illustrated.

Research paper thumbnail of Modello di previsione delle velocità praticate dadli utenti attraverso la definizione di una velocità ambientale

XIII convegno nazionale SIIV, 2003

Research paper thumbnail of Considerazioni critiche sull'inserimetno delle curve di raccordo nei tracciati stradali

XII convegno internazionale SIIV - Riqual. funzionale e sicurezza sist. viario, 2002

Research paper thumbnail of Modello di previsione delle velocità praticate dagli utenti attraverso la definizione di una velocità ambientale

Research paper thumbnail of Country Report--Italy: An Overview of National Guidelines and Policies on Highway Geometric Design

… on Highway Geometric …, 2005

Abstract: One of the strongest social costs that Italy pays in terms of mobility arises from the ... more Abstract: One of the strongest social costs that Italy pays in terms of mobility arises from the road accidents. In Italy, it has been estimated that road accident costs are about 2% of the GNP, that is an annual cost of about 30,000 millions of EURO. Italy with other countries of ...