Short summary presentation of rd v1

PRS Research R&D with World Leading Researchers Evaluation of Neoweb pavement in dynamic wheel load testing Impact of Neoweb on track maintenance cycles Contribution of Neoweb to Evaluate reinforcement performance of Neoweb load bearing and stress in road-base test site distribution Department of Transportation (DOTs) of Kansas, Iowa, Missouri, Nebraska & NY; Civil Engineering Dept., Kansas State University, USA Transport Technology Center, Inc (TTCI), Association of American Railroads (AAR); Facility for Accelerated Testing (FAST), Colorado, USA Institute of Geotechnical Engineering, Clausthal University, Germany KOAC-NPC Road Testing & Certification Institute, Holland R&D with World Leading Researchers Neoweb demonstration project – Chennai-Tada Highway, India Earth-quake simulation on shaking table with Neoweb gravity wall • L&T ECC – India's largest construction firm • IIT – India Institute of Technology, Madras • NHAI – National Highway Authority of India Dept of Civil Engineering and Mechanics, University of Delaware, USA, National Institute of Rural Engineering,T sukuba, Japan Neoweb load support under static & cyclic loading Civil, Environmental, and Architectural Engineering Dept., Univ of Kansas, USA Circular track bed infrastructure testing Proving & testing center, Sherbinka Station, Russian Railway Research Institute (VNII ZhT) Clausthal University, Germany Institute of Geotechnical Engineering Phase I - Road Experiment - Laboratory Testing Dynamic load tests with frequency of cycle/sec; Max load Fmax - 300 kN/m²; Min load Fmin - 25 kN/m² Clausthal University Road Experiment Phase I – Test Results – On Dry Sand Load Settlement – Dry Sand Results of Dynamic Plate Tests • Load-bearing capacityof geocell reinforced soil improved up to 5x • Settlementcan be reduced due to geocell mattress up to 80% • Vertical stressesin subgrade can be reduced up to 40% REINFORCED UNREINFORCED * Dependent on infill material & cell height Clausthal University Road Experiment Phase II – Rehabilitation of K27 Road Sections Clausthal University Road Experiment Phase II – Test Results Influence of Geocell Mattress on Subgrade Stresses Static Plate Loading on Top of Granular Layer Back Calculation Results – Unreinforced Layer vs Reinforced Layer • Modulus Ratio: Esb Reinforced 100 [MPa] / Esb Unreinforced 500 [MPa] = Clausthal University Road Experiment Phase III – Dynamic Loads & Falling Weights Deflectometer (FWD) Measurements Dynamic Trafficking km/h 40 km/h 70 km/h Differences between stresses in reinforced & unreinforced sections are ~ 34-40% FWD Measurements FWD measurements after long-term heavy trafficking: • Layer modulus for Neoweb reinforced 40 cm layer = 70 cm unreinforced layer • Field results confirmed by back calculations Deflections of 70 cm base = 40 cm Neoweb reinforced base KOAC - NPC Geosynthetics Road-Base Trial, Holland KOAC – NPC Test Program • Objectives – Evaluate leading “geogrids” performance in road base – PRS only geocell / manufacturer • Test Assumption – Reinforcement can only be measured accurately only by in-situ testing 4m 1.5m 1.5m • Special Controlled Site – Large, enclosed hangar protected from weather 1.5m 1.5m 2 test locations  within section 4m Road Base Thickness Reduction Factor – HIGH QUALITY INFILL Deflections Shape of deformation curve is primary parameter to derive reinforcement effect/graph Back-calculation Iterative procedure used to determine modulus of pavement layer ROAD BASE THICKNESS REDUCTION FACTOR STATION 10A1 10A3 Minimum 0.15 0.09 Maximum 0.50 0.50 Mean 0.47 0.40 Unprecedented Results • Neoweb Roadbase Thickness Reduction Factors exceeded all previously known values - 0.73 mean! – Factor for geogrids historically never exceeded 0.5 – Factor in this Trial for all geogrids was lower than 0.5 • Test evaluation for all products was therefore limited to 0.5! Testing - Conclusions Test Results Conclusions Only product that was able to be tested with inferior infill Highest Road Base Thickness Reduction Factor of any tested product * High engineering stiffness and strength Decreased subgrade stress Increased bearing capacity Long term durability Reduced pavement thickness – High quality infill – avg 43% – Inferior quality infill – 31.5% (* value limited to maximum of 50% by testing organization) Neoweb performance above and beyond geogrid capabilities – – – – Lowers costs Saves aggregate resources Faster installation Reduces environmental impact ... – India Institute of Technology, Madras • NHAI – National Highway Authority of India Dept of Civil Engineering and Mechanics, University of Delaware, USA, National Institute of Rural Engineering,T... Researchers Evaluation of Neoweb pavement in dynamic wheel load testing Impact of Neoweb on track maintenance cycles Contribution of Neoweb to Evaluate reinforcement performance of Neoweb load bearing... Department of Transportation (DOTs) of Kansas, Iowa, Missouri, Nebraska & NY; Civil Engineering Dept., Kansas State University, USA Transport Technology Center, Inc (TTCI), Association of American