No abstract

The most common effluent created by the oil industry is oily wastewater. This produced water (PW) corrodes the steel piles in the infrastructure of bridges, which shortens their service life. It is important to remove organic content in PW to prevent this outcome. Samples from the Ahdab oil field were used in this study. Two catalysts were selected: zinc oxide (ZnO) and titanium dioxide (TiO2) with photo presence as an energy source. The results were organic elimination of 96.4% and 93.4% using ZnO and TiO2, respectively. The experimental conditions were pH = 3 and an irradiation time of 120 min. Due to the ability of ZnO to adsorb high amounts of organic content from PW, there was an increased elimination of organic content. Hence, the maintenance of steel piles durability is a good alternative to approach the goals of this study. The results of the study demonstrated that the organic adsorption on a catalyst agent reinforced in nonappearance of radiation photo is insignificant.

According to most countries' norms, and to find the effect of the bridge collision the equivalent static method was designed for bridge-ship collision, ignoring the dynamic effects of shocks. It is sharply different from actual situation. So based on the theory of Winkler foundation, shearing strain theory of Timoshenko and potential energy variation functional principle of Hamilton, the simulation models of bridge piers was built considering the pile-soil interaction. Lateral transient vibration equation of bridge piers was concluded. Based on the theory of integral transform, the differential equation of the collision system and the boundary conditions were transformed with Laplace transformation; the analytical solution of the stress wave in frequency domain was concluded. And then the inversion of solution in frequency domain was carried out using Matlab based on the Crump inverse transformation. Finally the dynamic response law of displacement, normal stress and the shear stress of bridge piers were obtained.

No abstract

No abstract

In this paper, a comprehensive state-of-the-art study regarding the mechanism and enhancement of self-repair in asphalt pavement is presented. The review starts with defining the self-repair phenomenon as a natural property in asphalt materials that is associated with other properties such as the viscoelastic response. The difference between self-repair and the viscoelastic response is also presented. In addition, the factors influencing the self-repair mechanism (positively and negatively) are investigated. However, some of these factors remain vague and need to be investigated further. Furthermore, two enhancing self-repair processes, which are extrinsic technologies such as induction heating and encapsulated rejuvenators, are presented as alternative preventive maintenance applied to asphalt pavement. In conclusion, the self-repair could be achieved in an economic way in countries with hot climates, such as Iraq where temperature plays a significant positive role in enhancing the asphalt repair if enough rest period is provided, without the need to other extrinsic technologies to be applied.

A NeuroFuzzy System (NFS) is one of the most commonly used systems in the real life problems because it has explicit and transparency which results from the fuzzy systems, with the learning and generalization capabilities from the dynamic behavior of the neural networks. It is one of the most successful systems, which introduced to decrement the fuzzy rules that constituting the underlying model. This system has a high efficiency; it gives good results in high speed. The NFS used in this study to predict the settlement of deep pile foundations. The results obtained from this system give good agreement and high precious for prediction of settlement compared with hyperbolic model and statistical regression analysis. Also, this scenario can be applied for similar or more complicated problems in the geotechnical engineering.

This paper is a study of Beijing-Shanghai high-speed railway and measuring the settlement values of the Bridge with the time and load. The structure is safe to carry the applied loads. The settlement is measured using the single point of settlement account meter and calculated using the norm codes. The results showed a new field measurement method to calculate the compressed layer thickness which is considered as a difficult task to monitor in the field. The final results calculated for the settlement of the pile foundation needed correction of factors to be conservative for the measurement of the project. The correction factors are proposed to modify the codes calculation within the permissible ranges.