A Novel Approach for Proximate Analysis of Soil Corrosion Condition in Imadol-Sanagaun and Kantipur Colony Areas of Nepal

Abstract

The catastrophe failures of the underground water pipelines, made by Fe-alloys have been largely reported in Nepal, mostly due to the unwanted electrochemical interactions in the interfacial regions between the aggressive soils and external pipe surfaces. To cope with such pipe corrosion, this study was put forward a novel probabilistic approach for the proximate analysis of the corrosive grade of soils to the pipes with the improvement of the previously practiced ASTM, AWWA, and NACE classifying methods. In this non-deterministic approach, four corrosive groups were firstly classified based on the quantitative data of 6 soil properties, which were further classified into ten sub-corrosion groups by considering the sum of the cumulative point of each soil sample. The proximate soil analysis of twenty-four samples of the Sanagaun-Imadol (SNG-IDL) and Kantipur (KNT) housing areas of Lalitpur metropolitan (Kathmandu Valley) was performed to evaluate their corrosion conditions and to draw a corrosive soil mapping. The results of such proximate analysis under the probabilistic approach disclosed that ~ 92% of the total 24 soils of the study areas belonged to five specific sub-corrosion groups, which are considered the members of two corrosion groups, i.e., less and mildly corrosion groups.

Performance of Anticorrosive Measures of Steel in Concrete Infrastructure by Plant‐Based Extracts

“…[36] Besides, the XPS surface analysis confirmed the formation of iron oxy-hydroxy (FeOOH) species, which developed the hypothesis on the responsibility of iron-polyphenol insoluble organometallic compounds for anticorrosive properties. [37] However, to the best of the author's knowledge and belief, the anticorrosive behavior of the LEPG and its blend with LEMI to the SRC structures have not been virtually clarified yet, although few studies reported the corrosion conditions of different steel materials in concrete infrastructures, [39,40] and in soil environments [41][42][43][44] of Nepal. In this vein, current research explores a viable cement-based additive as an anticorrosive substance derived from the untapped leaf part of Nepal-origin M. indica and P. guajava plants to monitor the corrosion condition of steel bars embedded in the concrete slab.…”

An Approach for Grading of Soil Corrosiveness: A Case Study in Vicinity of Ring Road-Kathmandu

“…The main rationale for the corrosive disaster of the water pipelines is the external pipe corrosion in the soil environment, which is often accompanied by a high degree of indecision [3]. External pipe corrosion is a continuing process, and its rate does not make progress with a typical mathematical law as often applied in most cases, probably due to the complex nature of soil corrosion [4]. One of the most influential points that makes more complicated the study of the underlying water pipeline corrosion is the inadequately understood corrosive nature of various factors of the soil environment surrounding the underground pipelines which could vary with season/time [5].…”