Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
FORO NACIONAL CARRETERAS, CARRETERA S, PUENTES Y GESTION VIAL Diseñ o Estructural y Constr Constr ucci ó n de Pavimentos Asf álticos en Zonas Zonas de Altura Nuevos Nue vos Métod os y Materiales Materiales
Expositor Ing. Pablo Pablo del Aguil a Agui la Consultor en Tecnolog Tecnolog ías de Pavimentaci ó n
FACTORES QUE AFECTAN A LOS PAVIMENTOS EN ZONAS DE ALTURA
TEMPERATURA AMBIENTE BAJA (NOCHE(NOCHE -DIA) TEMPERATURA PAVIMENTO ALTA (DIA) GRADIENTE TERMICO RADIACION SOLAR MALA CALIDAD DE LOS AGREGADOS INADECUADA CALIDAD DE LOS LIGANTES ASFALTICOS CONDICIONES TOPOGRAFICAS CRITICAS FALTA DE UNA TECNOLOGIA APROPIADA
INSTITUTO INSTITUTO DE LA CONSTRUCCION CONSTRUCCION Y GERENCIA GERENCIA – ICG Telefax : 421-7896 /
[email protected] [email protected] / www.construccion.org.pe www.construccion.org.pe
1
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
PROBLEMATICA DE LOS PAVIMENTOS EN ZONAS DE ALTURA
Zona de Altura, Cordillera o Altiplano Altitud > 3,500 msnm
Radiación 5.5x106cal/m2/día
Precipitación 500-1500 mm +40...45°C
Gradiente
-15…-20°C
TEMPERATURA BAJA
- Endurecimiento del
bitumen (susceptibilidad térmica) - Rigidizaci Rigidizació ón de la mezcla - Fragilidad - Fisuramiento ante cargas de trá tráfico.
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
FACTORES QUE AFECTAN A LOS PAVIMENTOS EN ZONAS DE ALTURA
TEMPERATURA AMBIENTE BAJA (NOCHE -DIA)
TEMPERATURAS AMBIENTE NEGATIVAS (HASTA -20 C) DEPENDIENTE DE LA ALTITUD ((-6.5/km) Y VELOCIDAD DEL VIENTO SE AFECTA LA SUPERFICIE DEL PAVIMENTO (CONDICION VITREA) LOS EFECTOS SE HACEN CRITICOS CON EL TIEMPO (ENVEJECIMIENTO) CARGAS PESADAS Y LENTAS º º
TEMPERATURA ALTA
-Radiaci Radiació ón solar -Litoral vs. Zona Altura - Promueve oxidaci oxidació ón ===> calentamiento ===> endurecimiento ===> envejecimiento - Eleva el gradiente térmico
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
FACTORES QUE AFECTAN A LOS PAVIMENTOS EN ZONAS DE ALTURA
TEMPERATURA PAVIMENTO ALTA (DIA)
TEMPERATURAS AMBIENTE HASTA 2828-30 C DEPENDIENTE DE LA ALTITUD ((- 6.5/km) DEPENDIENTE DE LA RADIACION (Presió (Presión atmosf érica y masa volumé volumétrica de aire) PAVIMENTO ASFALTICO (Black Body) RELACION ENTRE TEMPERATURA AMBIENTE Y TEMPERATURA DEL PAVIMENTO (+ 1515 -20 20ººC) TEMPERATURA DEL PAVIMENTO HASTA 5050-55 55ººC º º
FACTORES QUE AFECTAN A LOS PAVIMENTOS EN ZONAS DE ALTURA
GRADIENTE TERMICO
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
FACTORES QUE AFECTAN A LOS PAVIMENTOS EN ZONAS DE ALTURA
GRADIENTE TERMICO
FACTORES QUE AFECTAN A LOS PAVIMENTOS EN ZONAS DE ALTURA
RADIACION SOLAR
CON LA ALTURA DISMINUYE LA PRESION ATMOSFERICA CON LA PRESION DISMINUYE LA MASA VOLUMETRICA DEL AIRE DEBIDO A LA MENOR DENSIDAD DEL AIRE AUMENTA LA RADIACION SOLAR LA RADIACION EN ALTURA ES APROXIMADAMENTE 5 VECES LA RADIACION A NIVEL DEL MAR SE PRODUCE UN MAYOR CALENTAMIENTO DEL PAVIMENTO SE ACELERAN LOS PROCESOS DE OXIDACION Y ENVEJECIMIENTO
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
FACTORES QUE AFECTAN A LOS PAVIMENTOS EN ZONAS DE ALTURA
CALIDAD DE LOS SUELOS Y AGREGADOS
AGREGADOS DE TIPO VOLCANICO BAJO PESO ESPECIFICO ALTA ABSORCION DE AGUA ASFALTO BAJO ANGULO DE FRICCION INTERNA BAJA RESISTENCIA AL CORTE DE LAS CARPETAS BAJO MODULO DE RESILIENCIA DE LAS CAPAS GRANULARES SUELOS CON ALTA RESILIENCIA
FACTORES QUE AFECTAN A LOS PAVIMENTOS EN ZONAS DE ALTURA
CALIDAD DE LOS LIGANTES ASFALTICOS
PEN 8585-100 / PEN 120120-150 BAJO PUNTO DE ABLANDAMIENTO BAJO PUNTO DE TRANSICION VITREA ALTA SUSCEPTIBILIDAD TERMICA CONTENIDO DE PARAFINAS PROPENSION A LA OXIDACION CAMBIOS RADICALES EN LA COMPOSICION QUIMICA ENDURECIMIENTO
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
FACTORES QUE AFECTAN A LOS PAVIMENTOS EN ZONAS DE ALTURA
CONDICIONES TOPOGRAFICAS CRITICAS CONDICIONES
CURVAS CON RADIOS PEQUEÑ PEQUE ÑOS PENDIENTES PRONUNCIADAS
FACTORES QUE AFECTAN A LOS PAVIMENTOS EN ZONAS DE ALTURA
FALTA DE UNA TECNOLOGIA APROPIADA
SOLO HAY PAVIMENTOS EN ALTURA EN ARGENTINA,
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
FACTORES QUE AFECTAN A LOS PAVIMENTOS EN ZONAS DE ALTURA CARGAS DE TRAFICO TEMPERATURA BAJA
GRADIENTE TERMICO
RADIACION SOLAR VIENTO
OXIGENO (AIRE)
OXIGENO OXIGEN O (AGUA) (A GUA) AGREGADOS DE MALA CALIDAD
ASFA LTO DE ASFALTO CALIDAD DUDOSA DUDOSA
SUELOS DE MALA CALIDAD (RESI (RESILIENTES) LIENTES)
MECANISMOS DE FALLA EN LOS PAVIMENTOS PAVIMENTOS PARA ZONAS DE ALTURA
ESTADIO INICIAL
MICROFISURAMIENTOS DURANTE LA COMPACTACION MICROFISURAMIENTOS DURANTE LA NOCHE POR
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
EFECTO DEL TRAFICO EN LA PROPAGACION DEL FISURAMIENTO
Pres Pr esio ione ness ne neut utra rass
Fisu Fi sura rami mien ento to
MECANISMOS DE FALLA EN LOS PAVIMENTOS PAVIMENTOS PARA ZONAS DE ALTURA
ESTADIO MEDIO
FISURAMIENTOS POR FATIGA TERMICA DEFORMACIONES PERMANENTES LOCALIZADOS
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
MECANISMOS DE FALLA EN LOS PAVIMENTOS PAVIMENTOS PARA ZONAS DE ALTURA
ESTADIO FINAL
FISURAMIENTOS POR FATIGA TERMICA FISURAMIENTOS POR FATIGA MECANICA Y ENDURECIMIENTO DEL PAVIMENTO DEFORMACIONES PERMANENTES GENERALIZADAS (CANALIZACION Y AHUELLAMIENTOS) EXUDACION PELADURAS
DISEÑO ESTRUCTURAL DE PAVIMENTOS PAVIMENTOS PARA ZONAS DE ALTURA
METODO DEL USACE
FILOSOFIA DEL METODO (CONGELAMIENTO E HINCHAMIENTO DE LOS SUELOS)
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
DISEÑO ESTRUCTURAL DE PAVIMENTOS PAVIMENTOS PARA ZONAS DE ALTURA
METODO DE LA AASHTO
FILOSOFIA DEL METODO (SERVICIABILIDAD Y CONFIABILIDAD) CAPACIDAD DE SOPORTE DEL SUELO MATERIALES PARA EL PAVIMENTO (Sub(Sub-base, Base granular, Mezcla Asf áltica) MODULOS COEFICIENTES ESTRUCTURALES
DISEÑO ESTRUCTURAL DE PAVIMENTOS PAVIMENTOS PARA ZONAS DE ALTURA
SELECCION DEL LIGANTE
CONDICIONES DE SERVICIO
TEMPERATURA SUPERIOR (+50º (+50ºC) TEMPERATURA INFERIOR ( 20 C) º º
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
DISEÑO DE MEZCLAS ASFALTICAS PARA PAVIMENTOS EN ZONA DE ALTURA
TECNOLOGIA CONVENCIONAL
CONTENIDO DE ASFALTO (5-6%) VACIOS DE AIRE (3-5%) ABSORCION DE ASFALTO ≤ 1% VACIOS EN EL AGREGADO MINERAL (14 -16%) ESTABILIDAD > 800 kg GRANULOMETRIA DE AGREGADOS (Especificacioness ASTM o Asphalt Institute) (Especificacione
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
DISEÑO DE MEZCLAS ASFALTICAS PARA PAVIMENTOS EN ZONA DE ALTURA
TECNOLOGIA PARA MEZCLAS EN ALTURA
PRACTICA NORMAL PARA LA SELECCION DE LA LA COMBINACION DE AGREGADOS
EXPERIENCIA MAYORITARIA: MEZCLAS FINAS (30(3040% RETENIDO EN LA MALLA Nº4) RESULTADOS: Mezclas con esqueleto mineral dé débil, envejecen rá rápidamente y fisuran)
FILOSOFIA PARA PAVIMENTOS EN ALTURA
USO DE LA LINEA DE MAXIMA DENSIDAD NO SE REQUIERE HUSO GRANULOMETRICO CURVA GRANULOMETRICA POR DEBAJO DE LA ZONA RESTRINGIDA (SUPERPAVE)
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
ESPECIFICACIONES SUPERPAVE ESPECIFICACIONES Porcentaje Pasante Pasante 100
Lí nea máxima densidad nea má
Zona restringida restringida Punto control control
tam nom max
tam max
0 .075
.3
2.36
4.75
9.5
12.5
Abertura de mallas (mm) a la Potencia 0.45
19.0
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
GRADACION SUPERPAVE
RESULTADOS Esqueleto mineral resistente Facilidad de compactaci ón a alta temperatura deformaciones es Resistencia a las deformacion permanentes a) Bajo contenido de asfalto (economí a)
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
LA EXPERIENCIA OPTIMA PARA PAVIMENTOS EN ZONAS DE ALTURA
RESULTADO DEL DISEÑO CARPETA: 10 cm (Construido= 8 cm) BASE GRANULAR: 15 cm SUB BASE: 15 cm
COEFICIENTE ESTRUCTURAL DE LA CARPETA CON POLIMEROS REAL: 0.75
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
EQUIVALENCIA ESTRUCTURAL PARA MEZCLAS CON ASFALTO CON POLIMERO 60000 50000 ) N ( a 40000 g i t a F 30000 e d a 20000 d i V 10000
CAP-20 4% SBS-AA 6% SBS-AA 4% SBS-BB 7% SBS-BB 4% SBS-CC 6% SBS-CC
0 4
7
8
10
15
Diferencia de tensiones (kg/cm2)
20
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
CONCLUSIONES LA PRACTICA DEL DISEÑO ESTRUCTURAL Y DE MEZCLAS ASFALTICAS PARA PAVIMENTOS EN ZONAS DE ALTURA, EN PARTICULAR EN EL PERU, MANTIENE UNA SERIE DE PARADIGMAS QUE NO CONTRIBUYEN A LA OBTENCION DE PAVIMENTOS RESISTENTES Y DURABLES.
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
CONCLUSIONES LA TECNOLOGIA SUPERPAVE EXPLICA MUCHOS DE LOS PROBLEMAS SUSCITADOS Y SU UTILIZACION HA AYUDADO Y ES DE ESPERARSE QUE CONTRIBUYA A LA SOLUCION DE LA MAYORIA DE ELLOS.
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Foro CARRETERAS, PUENTES Y GESTION VIAL Puno , 18 y 19 de Noviemb re de 2005 2005
CONCLUSIONES LOS ASFALTOS MODIFICADOS CON POLIMEROS, DE ACUERDO A LAS EXPERIENCIAS OBTENIDAS EN PROYECTOS A ESCALA REAL, SON UNA ALTERNATIVA TECNICA Y ECONOMICAMENTE FACTIBLE, AUN COMO INVERSION INICIAL.