The decreasing availability of aggregates and the large amount of aggregates needed for the construction and maintenance of infrastructures, have forced research staff, in Italy and in other countries, to seek alternative materials for road constructions. Presently, the use of recycled material becomes thus the key to more efficient and economical road construction. Currently, cold recycling technique presents major advantages due to minimum environmental and energy costs. In particular, this research involves foamed asphalt process as a possible technique for the cold recycling of flexible pavements. The main task of this work is to investigate the potentiality of foamed asphalt treated mix as a base course material. The work was carried out performing indirect tensile stiffness modulus and fatigue tests on cylindrical specimens prepared with different percentages of cement (1-3%) and foamed asphalt binder (2-4%). Test results showed that the changes in cement and foamed bitumen content resulted in a variation of the mechanical performance of the mix regarding its stiffness properties and fatigue resistance. In particular, the obtained results allow to state that only the choice of a correct bitumen-cement ratio ensures better performance concerning both the stiffness and fatigue properties and there is no univocal relationship between the stiffness properties and fatigue resistance performance regarding the investigated mixtures.
Performance Analysis of Mixtures Produced Using Foamed Bitumen
CERNI, Gianluca;
2005
Abstract
The decreasing availability of aggregates and the large amount of aggregates needed for the construction and maintenance of infrastructures, have forced research staff, in Italy and in other countries, to seek alternative materials for road constructions. Presently, the use of recycled material becomes thus the key to more efficient and economical road construction. Currently, cold recycling technique presents major advantages due to minimum environmental and energy costs. In particular, this research involves foamed asphalt process as a possible technique for the cold recycling of flexible pavements. The main task of this work is to investigate the potentiality of foamed asphalt treated mix as a base course material. The work was carried out performing indirect tensile stiffness modulus and fatigue tests on cylindrical specimens prepared with different percentages of cement (1-3%) and foamed asphalt binder (2-4%). Test results showed that the changes in cement and foamed bitumen content resulted in a variation of the mechanical performance of the mix regarding its stiffness properties and fatigue resistance. In particular, the obtained results allow to state that only the choice of a correct bitumen-cement ratio ensures better performance concerning both the stiffness and fatigue properties and there is no univocal relationship between the stiffness properties and fatigue resistance performance regarding the investigated mixtures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
