Large-scale concrete slab tests were conducted in the laboratory to evaluate effect of multiple wheel gears on fatigue resistance slabs. Monotonic and cyclic loading was completed sixteen fully-supported The monotonic testing characterized flexural strength under fullysupported conditions relative standard simply-supported beam test. program addressed effects peak stress ratio, range, pulse type For low cycle fatigue, range not a significant factor while applied controlled number repetitions...

With the use of mechanistic-empirical rigid pavement design methods becoming more widespread, it is important to note differences these in terms their sensitivity input parameters, conservativeness thicknesses, and failure modes predicted. This study further demonstrated parameters such as joint spacing, shoulder type, traffic level, climatic location, built-in curl level on fatigue mechanisms predicted by several methods. The widen lanes was also found predict different between...

This paper identifies the key slab loading locations for inducing critical bottom and top tensile stresses on airfield rigid pavements servicing A-380 aircraft. Finite element simulations were conducted A-380’s individual triple dual tandem (TDT) gear all its main landing gears a given geometry pavement material properties. The numerical results show that ratio between of significantly higher analysis relative to could be 1.0 some cases. Furthermore, this initial finite has shown...

The ability to spatially map the stiffness of foundation layers under concrete pavements with intelligent compaction has created a need define limits on allowable variations in given construction area as well maximum size non-complaint which does not require remedial action. In order work towards this goal, two-dimensional finite element analysis was completed determine effects four nonuniform subgrade support conditions (relative uniform support) tensile stresses slab tandem axle loading...

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Urban areas are characterized by a large proportion of artificial surfaces, such as concrete and asphalt, which absorb store more heat than natural vegetation, leading to the Heat Island (UHI) effect. Cool pavements, walls, roofs have been suggested solution mitigate UHI, but their effectiveness depends on local land-use patterns surrounding urban forms. Meteorological data was collected using mobile platform in Power Ranch community Gilbert, Arizona Phoenix Metropolitan Area, region that...

Full-depth and two-lift concrete slabs were cast with fractionated reclaimed asphalt pavement recycled aggregate as partial full replacements of the coarse in a ternary blend containing cement, slag, fly ash. These large-scale monotonically loaded at edge to quantify effect aggregates on slab's flexural capacity. Although introduction these into reduced compressive, split tensile, strengths well elastic modulus relative virgin concrete, fracture testing demonstrated that can have properties...

Instrumented concrete slabs were constructed in Palmdale, Calif., order to fail the slab sections under accelerated pavement testing. Prior fatigue failure testing, these monitored over 24h cycles without load, and a slow-moving 40kN rolling wheel load. Slab temperature profiles, edge corner deflections, interior vertical deflections collected at 2h intervals. A finite element program was used analyze deflection data calculate an effective built-in difference (EBITD) through slab, which...

Six different concrete mixtures were cast in the laboratory to evaluate fracture behaviour of paving made with recycled as a coarse aggregate, virgin and blend aggregate. Discrete structural fibres also added each mixture compare plain mixtures. Single-edge notched beam, compression, split-tensile tests performed. For specific aggregate (RCA) types studied, total energy an RCA was improved by 53% blending it The 0·2% volume fraction synthetic macrofibres similar same fibre dosage level...

Sustainably sourced development minerals are vital to meeting the demand for low-carbon construction materials. A potential waste material that can be a cementitious systems is waste-to-energy fly ash (WTE ash), byproduct of incineration. WTE contains chloride-bearing species and heavy metals, which promote steel reinforcement corrosion present long-term leaching risks. Here, we new multistep treatment protocol involving dissolution heating transform nonreadily removable chlorides in...

The demand to provide more sustainable facilities and infrastructure has increased over the past ten years. ability measure quantify environmental impacts of such projects is in higher demand. Life cycle assessment (LCA) studies/tools are developed for highway pavements but a limited number studies have been airports few their pavement facilities. This paper introduces LCA tool called LCAAIR 1.0 fill necessary gap quantifying sustainability strategies airfield pavements. LCA-AIR incorporates...