Analysis and Remediation of the Salinized, Damour Coastal (Dolomitic) Limestone Aquifer in Lebanon

Coastal aquifer management has recently emerged as a main scope in groundwater hydrology, especially in arid and semi-arid zones. About two thirds of the human population are currently gathered close to shorelines relying on coastal groundwater resources. Worldwide, these systems are subject to quality deterioration due to a multitude of...

Probabilistic analysis of manufacturing variability and wear of core engine components

In the framework of LuFo R\&T projects a number of Rolls-Royce Deutschland Low and High Pressure Compressor rotor blades were geometrically scanned at the beginning and end of their life cycle. Based on this data component wear, ageing and manufacturing variability across the life cycle of the engine can be derived. Using Computational Fluid...

Effects of strength hardening, stiffness degradation, strength deterioration and pinching on the seismic response of SDoF systems

One of the most commonly used seismic analysis methods, over the last few decades is the equivalent lateral force method. This procedure, which was initially intended for elastic design of structures, has been extended to inelastic design, with the incorporation of the behaviour factor q or with the integration of response spectrum procedures...

Mitigation of saltwater intrusion by ‘integrated fresh-keeper’ wells combined with high recovery reverse osmosis

Most countermeasures to mitigate saltwater intrusion in coastal, karstic or fractured aquifers are hindered by anisotropy, high transmissivities and complex dynamics. A coupled strategy is introduced here as a localized remedy to protect shallow freshwater reserves while utilizing the deeper intercepted brackish water. It is a double sourcing...

Hotspots for selected metal elements and microbes accumulation and the corresponding water quality deterioration potential in an unchlorinated drinking water distribution system

Biofilm formation, loose deposit accumulation and water quality deterioration in drinking water distribution systems have been widely reported. However, the accumulation and distribution of harbored elements and microbes in the different niches (loose deposits, PVC-U biofilm, and HDPE biofilm) and their corresponding potential contribution to...

Analysing spatial patterns in lateral house connection blockages to support management strategies

The performance of lateral house connections has a direct impact on sewer serviceability. Despite the potential consequences of a blockage, these components are generally maintained with a reactive approach. As inspection data on the condition of lateral house connections are scarce, this study adopts a statistical procedure to support...

Use of Anionic Polyamide-6 Composites in Oil and Gas Pipeline Environment

A Consideration on Deterioration Model for Cold Region Tunnel Lining Based on Life-cycle Concept

This paper proposes the tunnel lining deterioration model which is based upon actual inspection data in order to carry out strategic maintenance and to rationalize life cycle cost analysis for tunnel structures. The evaluation value of deteriorating tunnel structures is a non-stationary stochastic process, and reliability problems of such...

Towards structural modelling of alkali-silica reaction in concrete

Structures affected by Alkali-Silica Reaction (ASR) include large massive concrete dams and bridges, which are considered essential for the infrastructure system, and not easily replaceable. The main feature of this reaction is the creation of a hydrophobic expansive gel which causes internal damage in the concrete. This damage is strongly...

Maintaining mixed neighbourhoods. Fatih plateau: The completed nucleus. A generative strategy for historical Istanbul

The project is the result of a combination of operations performed on the site adjacent to Fatih mosque. It aims to programmatically complete the area’s nucleus to adequately provide for a pluralistic society in conjunction with Fatih mosque that currently dominates the area with its singular religious program. The essential objective is to...

Monitoring ground settlement to guide sewer asset management

The study into the influence of (differential) settlement on the functioning of sewer systems was initiated to search for additional criteria to make sewer pipe replacement decisions more sensible. For this Amsterdam was used as a case study. Like many megacities (e.g. Jakarta, Bangkok, Tokyo, Shanghai), Amsterdam is situated in a delta area. As...

Deterioration Mechanisms and Durability of Sprayed Concrete for Rock Support in Tunnels

Steel fibre reinforced sprayed concretes used for rock support in tunnels are subjected to variable and complex exposure conditions. Structurally weakened concretes (5 to 35 years old) were investigated with respect to deterioration mechanisms, sources of aggressive agents and related engineering aspects. The evidence was based on field...

Model of economic justification of constructions' renovations

In the life cycle of constructions we often cope with the problem if it is economic justificated to renovate certain construction. On the market we meet growing problem of older constructions which are more and more neglected and unkept. This is the consequence of high number of new apartments and other constructions. General crisis has also an...

Markov processes for maintenance optimization of civil infrastructure in the Netherlands

The Netherlands, like many countries in this world, face a challenging task in managing civil infrastructures. The management of vital infrastructures, like road bridges, is necessary to ensure their safe and reliable functioning. The Directorate-General for Public Works and Water Management in the Netherlands manages the structures in the...

Effect of Spatial Variability on Maintenance and Repair Decisions for Concrete Structures

Due to the increasingly number of elder and deteriorating structures, maintenance is becoming a serious and more complex problem in most of the countries. A lot of studies have been carried out in this area for years. However, the fact that a lot of parameters show spatial random variability, which is linked with dependencies on temperature, w/c...