Nowadays,the use of geocell is gaining more importance in pavement industry as it offers improved performance through confinement and tensioned membrane actions.In recent years,solid waste management seeks greater att...Nowadays,the use of geocell is gaining more importance in pavement industry as it offers improved performance through confinement and tensioned membrane actions.In recent years,solid waste management seeks greater attention as it poses serious issues related to their disposal,health,and environmental hazards.Effective recycling and reuse of these wastes could be a viable and economical approach towards sustainable construction.In this regard,two such wastes(scrap tyres and construction and demolition(C&D)waste)are investigate.The recycled concrete aggregates(RCAs)obtained from the C&D waste are used as granular sub-base(GSB)material,and its performance is compared with con-ventional crushed aggregates(CCAs).Scrap tyre is used as cellular reinforcement(recycled tyre cell(RTC)),and its effectiveness as a reinforcing material is compared with the com-mercial cellular reinforcement(commercially available geocell(CGC)).The study involves construction of laboratory pavement sections under unreinforced and reinforced condi-tions and testing under repeated loading.The pavement sections supplemented with CGC and RTC reinforcement shows reduced permanent deformation by 27%,33%and 30%,35%,respectively,for CCA and RCA infill materials.The comparable performance of RCA with CCA is attributed to the self-cementation effect offered by the adhered residual cement mortar.With CGC and RTC reinforcement,the residual pressure at the subgrade level reduces by 30%and 37%,respectively.The provision of cellular reinforcement improves the stress distribution angle,and the highest improvement is observed in case of RTC.The improved behaviour with RTC is due to the larger strip thickness and tensile strength of recycled tyre strip than those used in the preparation of CGC.Irrespective of the infill material,higher strains are experienced under the loading zone than the neigh-bouring cells.Overall,the study promotes the use of scrap tyres and RCAs in bulk volume for pavement construction,offering an eco-friendly,cost-effective,sustainable,and long-lasting pavements.展开更多
Inverted pavements have proven performance across the world,and there is a need to opti-mize the layer thickness and material properties of the pavement addressing the critical failures in the mechanistic-empirical pa...Inverted pavements have proven performance across the world,and there is a need to opti-mize the layer thickness and material properties of the pavement addressing the critical failures in the mechanistic-empirical pavement design.The present study is made on bituminous concrete(BC)pavement with traffic up to 50 samples per second(MSA)and studying the critical factors affecting the pavement performance.The Minitab’s response surface methodology(RSM)box behnken method,was used for the design of experi-ments which includes critical factors and responses obtained from ANSYS finite element modeling of the inverted pavement.The critical factors and responses are normally dis-tributed and indicate a linear relationship with the least error.The composite desirability for minimum stress and strains in the pavement layers was found to be 0.89.The optimized pavement thickness and layer material properties were validated with two pavement field cross sections of different Indian national highways,and it is observed that the optimized cross-section is safe.Further,this research paper carried out life cycle cost analysis(LCCA)and life cycle assessment(LCA)of inverted pavement with optimized pavement cross-section obtained including the carbon footprint during the vehicle operation phase.The study demonstrated the benefits of inverted pavement with reduced costs and carbon emissions.Thus,this approach paves the way towards sustainable and long-lasting pavements.展开更多
文摘Nowadays,the use of geocell is gaining more importance in pavement industry as it offers improved performance through confinement and tensioned membrane actions.In recent years,solid waste management seeks greater attention as it poses serious issues related to their disposal,health,and environmental hazards.Effective recycling and reuse of these wastes could be a viable and economical approach towards sustainable construction.In this regard,two such wastes(scrap tyres and construction and demolition(C&D)waste)are investigate.The recycled concrete aggregates(RCAs)obtained from the C&D waste are used as granular sub-base(GSB)material,and its performance is compared with con-ventional crushed aggregates(CCAs).Scrap tyre is used as cellular reinforcement(recycled tyre cell(RTC)),and its effectiveness as a reinforcing material is compared with the com-mercial cellular reinforcement(commercially available geocell(CGC)).The study involves construction of laboratory pavement sections under unreinforced and reinforced condi-tions and testing under repeated loading.The pavement sections supplemented with CGC and RTC reinforcement shows reduced permanent deformation by 27%,33%and 30%,35%,respectively,for CCA and RCA infill materials.The comparable performance of RCA with CCA is attributed to the self-cementation effect offered by the adhered residual cement mortar.With CGC and RTC reinforcement,the residual pressure at the subgrade level reduces by 30%and 37%,respectively.The provision of cellular reinforcement improves the stress distribution angle,and the highest improvement is observed in case of RTC.The improved behaviour with RTC is due to the larger strip thickness and tensile strength of recycled tyre strip than those used in the preparation of CGC.Irrespective of the infill material,higher strains are experienced under the loading zone than the neigh-bouring cells.Overall,the study promotes the use of scrap tyres and RCAs in bulk volume for pavement construction,offering an eco-friendly,cost-effective,sustainable,and long-lasting pavements.
文摘Inverted pavements have proven performance across the world,and there is a need to opti-mize the layer thickness and material properties of the pavement addressing the critical failures in the mechanistic-empirical pavement design.The present study is made on bituminous concrete(BC)pavement with traffic up to 50 samples per second(MSA)and studying the critical factors affecting the pavement performance.The Minitab’s response surface methodology(RSM)box behnken method,was used for the design of experi-ments which includes critical factors and responses obtained from ANSYS finite element modeling of the inverted pavement.The critical factors and responses are normally dis-tributed and indicate a linear relationship with the least error.The composite desirability for minimum stress and strains in the pavement layers was found to be 0.89.The optimized pavement thickness and layer material properties were validated with two pavement field cross sections of different Indian national highways,and it is observed that the optimized cross-section is safe.Further,this research paper carried out life cycle cost analysis(LCCA)and life cycle assessment(LCA)of inverted pavement with optimized pavement cross-section obtained including the carbon footprint during the vehicle operation phase.The study demonstrated the benefits of inverted pavement with reduced costs and carbon emissions.Thus,this approach paves the way towards sustainable and long-lasting pavements.
