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

Abstract

The objective of this article was to investigate the potential for the dissolution and leaching of certain chemical elements from the protective mortar coatings of prestressed concrete cylinder pipe (PCCP) into drinking water in the event of leakage and how this might affect the overall quality of the water delivered to consumers. The mortars as linings are also typically used for renovation of old pipes. Samples from three frequently used mortar coating mixtures underwent immersion in water after 28 days of curing and were monitored for 430 days. The water was tested for pH levels and the presence of aluminum, chromium, lead, and iron, in accordance with the standards set for human consumption in Moroccan and other countries such as Australia, Canada, and the United States, as well as organizations such as the European Union and World Health Organization. The results indicate that the highest levels of aluminum, iron, chromium, and lead leaching occurred after the initial contact with water, gradually declining over time. Furthermore, the inclusion of silica fume and fly ash in the coating increases the potential for chemical element leaching. Additionally, preinstallation pipeline washing demonstrates its effectiveness in reducing the leaching of chemical elements into drinking water in the event of leakages. The overall results suggest that the likelihood of contamination of drinking water by leaching of chemical elements from the mortar coating in case of a leakage appears to be negligible under the studied conditions.

Anticorrosive Efficiency of the AISI 316 SS in Sustainable Ecological Concrete Manufactured with SCBA-SF Exposed to Magnesium Sulphate

“…For everything mentioned in the previous paragraphs, the objective of the present investigation was to analized the anticorrosive efficiency of the reinforced steel AISI 316 SS in comparison to the steel AISI 1018 at being embedded in Sustainable Ecological Concrete (SEC) manufactured with partial substitutions of Portland Cement by combinations of SCBA and SF in 10%, 20%, and 30% exposed to the solution at 3.5% of MgSO 4 , as aggressive environment. This research contributes to the development of durability concretes and the use of agro-industrial and industrial wastes, and in the decrease of use of cement, what is going to impact the reduction of emissions of CO 2 from the cement industry, which is responsible for the 6% to 8% of the emissions of CO 2 at global level [42]- [46]. With the obtained results of corrosion potential (E corr ) and corrosion rate (I corr ), of the steels of the present research, it can be identified the mixture of concrete SEC that brings a higher protection or durability against corrosion for the presence in magnesium sulphate.…”