Carbon nano-onions (CNOs) represent a still largely unexplored carbon allotrope. Promising properties of these unique structures are driving the research efforts in this area, but many technical problems remain their preparation, derivatization, separation and characterization. In article, we report partial purification, multiple functionalization solubilization CNOs. With only one priorly published short communication describing CNO functionalization, present work is most comprehensive...

Nanotechnology has the potential to create many new materials and devices with wide-ranging purposes. Nano-sized particles have been used in numerous applications improve properties of various materials. The utilization nanotechnology civil engineering is expected increase may become an attractive alternative for asphalt binder modification. objective this study was investigate evaluate rheological binders containing percentages carbon nanoparticles after a short-term aging process....

Nano-sized particles have been used in numerous applications to improve properties of various materials. The utilisation nanotechnology civil engineering area is relatively new and its use are expected increase rapidly. objective this study was investigate evaluate the rheological binders containing percentages carbon nanoparticles after a long-term ageing process. experimental design for included utilisations five binder sources (three grades PG 64-22, 64-16 52-28) four nano (0.0, 0.5, 1.0...

Abstract In recent years, nano technology, a relatively new field in science dealing with structures that are on the scale, have been used numerous applications to improve properties of various materials. However, use this technology has not explored detail area asphalt binder The objective study was investigate and evaluate high temperature rheological binders containing percentages carbon particles. experimental design for included utilization five sources, three grades (PG 64-22, PG...

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...

Addition of saturated lightweight aggregate fines to concrete have demonstrated the ability enhance hydration, reduce autogeneous shrinkage and permeability, increase strength. However, no study has yet been conducted on impact employing aggregates in mixtures moisture curling under external drying conditions. In this study, a set paving was cast with without fine aggregates. Saturated were found specimen up 50% when compared an identical mixture As curing duration increased, deformations...

The macro-fiber content in concrete cast the field is critical to achieving desired toughness properties and performance of structure. Currently, there exists no standard method determine polymer fiber hardened concrete. A nuclear density/moisture gauge was used on pavements with without fibers. Polymeric fibers are composed primarily carbon hydrogen. Since these elements substantial neutron thermalizers, count detector sensitive changes content. effects hydrogen present unreinforced itself...

Abstract A new concept for designing concrete pavements by optimising the slab geometry in order to reduce thickness as well minimise mechanical load transfer devices has recently been proposed. Theoretically, reduced size lowers and curling-induced tensile stresses concomitantly a thinner can be constructed. Full-scale test sections were constructed tested under accelerated pavement loading conditions validate this design hypothesis. The material factors studied research of 9, 15 or 20 cm;...

Abstract Electrical resistivity measurements are increasingly being used as for concrete acceptance in practice. It has been shown that these sensitive to temperature. This paper examines the influence of temperature on electrical concrete. Two correction approaches commonly by researchers and practitioners were evaluated: a linear approach (α) an activation energy–based (Ea-cond). These compared with each other their predictive capabilities assessed using measured data from various...

Artificial neural networks (ANNs) and Gb*-based regression models were used for the prediction of dynamic modulus (|E*|) South Carolina's hot mix asphalt mixtures (HMAs) majority which contained recycled pavement (RAP). Models' training testing done using a database that 1656 |E*| values from 93 HMA mixtures. included Hirsch, revised Bari-Witczak, Al-Khateeb 1, 2, NCHRP 1-40D, simplified global models. The results showed had significant bias in prediction; Coupling VMA Gb* most influence on...

The adoption and utilization of technology for quality management (QM) processes procedures is an efficient effective tool to improve project performance, service life, cost. Studies using existing emerging technologies QM in highway construction have found better results compared with those conventional or traditional procedures. However, the extended use these paving operations industry limited due stakeholders' aversion innovation. This study identified assessed usefulness used pavement...

Abstract A new concrete fracture geometry is presented, which can quantify multiple properties from a single specimen test. The disk-shaped compact tension (DCT) allows specimens to be fabricated laboratory cylinders or field cores. DCT test characterizes the concrete's critical stress intensity factor, KIC, crack-tip opening displacement, CTODc, and initial energy, Gf, as well specimen-dependent total GF. DCT-based have same experimental variation single-edge notched beam experimentally...

Abstract The formation factor obtained through electrical resistivity measurements is becoming a popular method to determine transport properties of concrete. Resistivity are dependent on multiple factors, including degree saturation, pore solution conductivity, and temperature. Arrhenius equation used correct for temperature effects using an activation energy conduction (Ea-cond). This parameter has been measured wide variety materials, solutions, pastes, mortars, concretes (with saturation...

The estimation of concrete fracture properties is essential for an accurate cracking prediction pavement systems. single-edge notched beam test has been used to characterize parameters materials in the laboratory, but obtaining a field specimen with this geometry not always practical. Currently, standard exists, ASTM D7313, measurement energy asphalt using disk-shaped compact tension (DCT) test. benefit both and that it can easily be fabricated laboratory or cored from field. total (GF)...

Between 1986 and 1987, the Illinois Department of Transportation constructed a section 10-in. continuously reinforced concrete pavement (CRCP) containing recycled aggregate on I-57 near Effingham, Illinois. Functional structural data, including falling weight deflectometer tests, visual distress surveys, surface profiles, skid numbers were collected periodically throughout service life pavement. Falling results indicated that exhibited excellent load carrying, with an average transfer...

The construction industry is stigmatized by low-quality performance at the end of product delivery. poor quality sometimes observed in highway leads to reduced service life and requires urgent attention. Although innovations such as increased reliance on automation have helped improved other industries, relies primarily traditional conventional procedures. To improve adoption construction, stakeholders should be provided with information that can enhance their decision making. This study...

Historically, the use of internal curing began with a low water-to-cement ratio (w/c) and high-strength concrete. More recently, benefits reduced autogenous shrinkage improved hydration have been recognized over wider range mixtures. In North America, internally cured mixtures are typically made using prewetted fine lightweight aggregates (FLWA). The volume FLWA used in an concrete is usually determined on principle that provides water equivalent to chemical shrinkage. This study examines...

Large-scale concrete slabs and laboratory-sized specimens containing recycled aggregate (RCA) fractionated reclaimed asphalt pavement (FRAP) to partially replace the coarse were tested failure. The aggregates had lower flexural strengths than with virgin aggregates. However, cast materials a similar load capacity slabs. results from large-scale testing demonstrated that these used in performed better what standard beam strength tests predicted, thus thickness design of mixtures may not need...