The version presented here may differ from the published version or from the version of the record. Please see the repository URL above for details on accessing the published version and note that access may require a subscription.

The version presented here may differ from the published version or from the version of the record. Please see the repository URL above for details on accessing the published version and note that access may require a subscription.

The continuous population growth around the world associated with industries development results in considerable amounts of waste materials. Therefore, a series concern has arisen to find environmentally safe treatment for these wastes. This research aims to study the possibility of using palm fibers locally available as waste materials in asphalt pavement industry. In particular, this work investigates the volumetric properties and tensile strength of asphalt mixtures manufactured with palm fibers. Asphalt mixtures were prepared with five contents of palms fibers (0.2, 0.4, 0.6, 0.8, 1.0) % by weight of aggregate passing sieve No. 4 to compare their properties with that of traditional mixtures. Marshall and indirect tensile strength (ITS) test methods were conducted to evaluate the volumetric and mechanical properties of asphalt mixtures. It can be concluded that adding this type of fiber to asphalt mixtures is possible. It was found that adding different contents of palm fiber has generally increased the density, voids filled with asphalt, and tensile strength and decreased the voids in mineral aggregate (VMA) of asphalt mixtures. However, no inflection points can be noticed on the curves of these properties. That might suggest investigating more palm fiber contents to find its optimum.

No abstract

Separate sewer systems are currently used in all new developments and are prevalent in comparison with combined sewer systems, the use of which is limited due to numerous environmental regulations. However, the narrow streets common in the United Kingdom, Europe, and other densely populated countries are usually occupied by complex networks of infrastructure services; consequently, finding space to install a traditional separate sewer system is challenging. This paper presents an original design for separate sewer systems that overcomes this challenge by combining the advantages of separate and combined sewerage systems into one sewer network. The proposed system includes a novel design for the access chamber shape that allows storm flows and foul flows to pass through it without mixing and allows one trench to accommodate both pipelines. Applying this system in a case study showed a reduction in construction costs of approximately 10% and a 16% reduction in the footprint; moreover, the construction time was decreased by 44%, and the storage capacity and retention time were increased by 280% and 200%, respectively.