Performance of Prestressed Concrete Cylinder Pipe in North Africa: Case Study of the Water Transmission Systems in the Tafilalet Region of Morocco

Investigating the possibility of PCCP mortar coating leaching and the impact on drinking water quality

“…[6] Some PCCP failures can occur prematurely. The reader can refer to Hassi et al [5,7,8] for further information on the premature failures of PCCP pipelines in North Africa. These pipelines are typically critical to utilities, so unexpected service interruptions caused by pipeline failures place a significant burden on the utility and may result in the utility being unable to meet the needs of its customers.…”

“…[2] Some PCCP failures have also been linked to the deterioration of the mortar coating sprayed around the prestressing wires due to the aggressive nature of the soil surrounding the pipes. [3,5,8,12] This puts ground water and oxygen in direct contact with the prestressing wires and/or the steel cylinder and leads to their corrosion and subsequent failure. [3] Thus, improving the performance the cement mortar is particularly important for water utilities.…”

“…The survey identified a considerable number of PCCP pipelines that had failed, with the majority of the failures being preceded by leakage. The reader can refer to Hassi et al [5,7,8] for detailed results.…”

“…The reader can refer to Hassi et al. [ 5,7,8 ] for detailed results. The reader must also keep in mind that these mortars as linings are also typically used for renovation of old pipes in the region.…”

Durability Performance of Reinforced Concrete-Based Fly Ash Exposed to Combined Chloride-Sulfate Attack

“…The principal cause of deterioration of many concrete structures is due to corrosion reinforcement because of the presence of chloride or/and sulfate [5][6][7]. Xiao et All, indicated that the key of limiting the conjoint chloride and sulfate attack is to enhance the densification of the concrete and block the connectivity of pore structure and microcrack [8].…”