A5089838358- Concrete and Cement Materials Research
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Innovative concrete reinforcement materials
- Asphalt Pavement Performance Evaluation
- Recycled Aggregate Concrete Performance
- Innovations in Concrete and Construction Materials
- Structural Behavior of Reinforced Concrete
- Infrastructure Maintenance and Monitoring
- Synthesis and characterization of novel inorganic/organometallic compounds
- Magnesium Oxide Properties and Applications
- Recycling and utilization of industrial and municipal waste in materials production
- Thermography and Photoacoustic Techniques
- Organometallic Complex Synthesis and Catalysis
- Non-Destructive Testing Techniques
- Corrosion Behavior and Inhibition
- Concrete Corrosion and Durability
- Geotechnical Engineering and Underground Structures
- Organoboron and organosilicon chemistry
- Nuclear materials and radiation effects
- Digital Holography and Microscopy
- Extraction and Separation Processes
- Asymmetric Hydrogenation and Catalysis
- Smart Materials for Construction
- Recycling and Waste Management Techniques
Virginia Tech
2020-2025
Virginia Transportation Research Council
2024
University of Münster
2017-2021
National Institute of Standards and Technology
2017-2020
University of Illinois Urbana-Champaign
2013-2018
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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Roller-compacted concrete (RCC) pavement has renewed interest among designers as a sustainable option with the potential to lower total cement content, incorporate recycled aggregates, reduce road closure time, and decrease project costs. One main design challenge is whether RCC can achieve same performance life conventional portland (PCC) similar slab thickness. This research investigated strength fracture properties of containing virgin aggregates fractionated reclaimed asphalt (FRAP)...
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...
In situ digital holographic microscopy is used to characterize the dissolution flux of polycrystalline cubic tricalcium aluminate (C3A-c). The surface dissolves at rates that vary considerably with time and spatial location. This implies a statistical distribution fluxes, but an approximately steady-state median rate was obtained by using flowing solutions reducing water activity in solution. from highly crystalline C3A-c depends on raised empirically derived exponent 5.2 extrapolates - 2.1...
The research study described in this paper investigated the potential to use steel furnace slag (SFS) as a stabilizing additive for clayey soils. Even though SFS has limited applications civil engineering infrastructure due formation of deleterious expansion presence water, free CaO and MgO contents allow be potentially suitable candidate soil stabilization improvement. In investigation, kaolinite clay was stabilized with 10% 15% ladle metallurgy (LMF) fines by weight. This experimental also...
With the depletion of natural resources, it is essential to use recycled materials and industrial wastes adapt expanding building sector environment. Slag from electric arc furnaces one example that can be used as a siderurgical aggregate in concrete production. Studying interfacial transition zone between binder necessary because reaction significantly impact concrete's microstructure mechanical properties. In order examine any sample with physical or chemical structure, this study...
Steel furnace slag (SFS) is an industrial by-product that used as abrasion-resistant aggregate in asphalt pavement surfaces. However, SFS has found limited application concrete pavements because of its potential for expansion from hydration the free calcium and magnesium oxides present slag. This study investigated asphalt-coated aggregates, i.e., coarse fractionated reclaimed (FRAP), concrete. Autoclave testing FRAP samples chemical analyses revealed contains residual oxide therefore to...
Reclaimed asphalt pavement (RAP), when used as aggregate in concrete, is known to reduce the bulk concrete strength and modulus but not dramatically impact shrinkage, durability, or fracture properties, especially at lower replacement levels. This article presents an overview of RAP aggregates it pertains its effect on microstructure, design. The mechanisms resulting decreased for containing have been linked to: (1) larger, more porous interfacial transition zone (ITZ) (2) dominance cohesion...
This study considered the effects of recycled concrete aggregate (RCA) as a replacement both coarse and fine in concrete. The portion was replaced by 100% RCA with at various amounts up to 50%. In addition, fly ash ground granulated blast furnace slag were utilized partial replacements cement. All mixtures prepared using twostage mixing approach partially saturated condition. use (RFA) reduced strength. However, it found that can have statistically similar compressive strength no RFA....
The use of steel furnace slag (SFS) aggregates is limited in the United States and abroad, primarily because inherent expansion potential material, which results from hydration free calcium magnesium oxides present slagging process. When used concrete, literature presents contradictory findings, such as that strength can increase or decrease with addition SFS aggregates. Microstructural investigations well interfacial transition zone (ITZ) mortars revealed mechanical properties are strongly...