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Properties Of Concrete

Nanotechnology in concrete – A review

Use of recycled plastic in concrete: A review

One dimensional nanostructured materials

Graphene oxide (GO) is the product of chemical exfoliation of graphite. Due to its good dispersibility in water, high aspect ratio and excellent mechanical properties, GO is a potential candidate for use as nanoreinforcements in cement-based materials. In this paper, GO was used to enhance the mechanical properties of ordinary Portland cement paste. The introduction of 0.05 wt% GO can increase the GO-cement composite compressive strength by 15-33% and the flexural strength by 41-59%, respectively. Scanning electron microscope imaging of the GO-cement composite shows the high crack tortuosity, indicating that the two-dimensional GO sheet may form a barrier to crack propagation. Consequently, the GO-cement composite shows a broader stress-strain curve within the post-peak zone, leading to a less sudden failure. The addition of GO also increases the surface area of the GO-cement composite. This is attributed to increasing the production of calcium silicate hydrate. The results obtained in this investigation suggest that GO has potential for being used as nano-reinforcements in cement-based composite materials.

Mechanical properties and microstructure of a graphene oxide-cement composite

Development of bridge WIM systems without axle detector using artificial neural network

Testing results of six existing prestressed concrete bridges are used to evaluate analytical methodology. These bridges cover different span lengths, number of lanes, and skew angles. Strains, load distribution factors, and ratings predicted by finite element analyses and AASHTO code specifications were compared with those from measurements. The comparison revealed a significant difference between numerically simulated and measured results due to the effects of many field factors. Factors that exist in reality but whose effects on bridge performance cannot easily be quantified are defined as field factors. Due to thses field factors, existing bridges are different from idealized models and are thus defined as fields bridges. To examine this difference and to quantify their effects, some field factors were modeled in a more refined finite element analysis. It is found that field factors have a larger effect on the maximum strain than on the load distribution factor. Parametric studies of the effects of diaphragms, bearing stiffness, and shew angles on the load distribution and maximum strain were conducted.

Performance Evaluation of Prestressed Concrete Bridges using Field Test Data and FE Analysis

This paper discusses 2D lattice models of beams for simulating the fracture of brittle materials. A simulation of an experiment on a concrete beam subjected to bending, in which two overlapping cracks occur, is used to study the effect of individual beam characteristics and different arrangements of the beams in the overall lattice. It was found that any regular orientation of the beams influences the resulting crack patterns. Methods to implement a wide range of Poisson`s ratios are also developed, and the use of the lattice to study arbitrary micro-structures is outlined. The crack patterns that are obtained with lattice are in good agreement with the experimental results. Also, numerical simulations of the tests were performed by means of a lattice model, and non-integer dimensions were measured on the predicted lattice damage patterns.

Crack propagation simulation of concrete with the regular triangular lattice model

A median barrier in the road is to separate driver and passenger the traffic flow in the 4-line over highway. In order to keep thee safety of and minimize the traffic jam in the traffic accidents, the ubiquitous intelligent median barrier system is proposed in this paper. This system is required to develop the sensor node fields in the median barrier, which detects the traffic accident using vibration sensors and wireless communication network. Free space test to sensing & receiving radio frequency, verification of middleware to report and countermeasure the accident intelligently to police and hospital are carried out.

Development of Ubiquitous Median Barrier System in the Highway

Cheol-Hwan Kim Seong-Tae Yi Byung-Wan JoAbstractA deterioration of typical reinforced concrete (RC) bridge deck is due to the use of calcium chloride, cracks and water penetration inside of the deck slab with steel reinforcement. In order to eliminate the defects of RC decks in terms of material,therefore, the steel-strapped deck system is studied and developed by maximizing the arching effect while the girders are restrainedusing straps in lateral direction to the bridge. This parametric study was performed to analyze the structural characteristics of steel-strapped deck, and to identify the factors of the thickness, span length and lateral restraint stiffness of deck slab considering the concrete non-linearity. Finally, a design equation, which is adequate to South Korea, is suggested.Keywords : Lateral restraint, Concrete deck, Parametric study, Design equation, Reinforced concrete

https://www.koreascience.kr:443/article/JAKO201418534781906.pdf

Byung-Wan Jo

Papers

Development of bridge WIM systems without axle detector using artificial neural network

Performance Evaluation of Prestressed Concrete Bridges using Field Test Data and FE Analysis

Crack propagation simulation of concrete with the regular triangular lattice model

Development of Ubiquitous Median Barrier System in the Highway

Design Equation Suggestion through Parametric Study of Laterally Restrained Concrete Decks with Steel Strap