Nitrite admixed concrete for wastewater structures: Mechanical properties, leaching behavior and biofilm development. (10th February 2020)

• Record Type: Journal Article
• Authors: Li, Xuan; O'Moore, Liza; Wilkie, Simeon; Song, Yarong; Wei, Jing; Bond, Philip L.; Yuan, Zhiguo; Hanzic, Lucija; Jiang, Guangming
• Is Part Of: Construction & building materials. Volume 233(2020)
• Publication Date: 2020-02-10
• Subjects: Calcium nitrite -- Concrete -- Sewer -- Biofilm -- Sulfate resistant cement; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.117341
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: A systematical study of the impact of calcium nitrite addition in sewer structures. Mechanical property changes in concrete is proportional to calcium nitrite dosages. Concrete with up to 4% calcium nitrite meets the structural requirement. Nitrite leached to receiving water is proportional to the level of addition. Calcium nitrite in concrete is environmentally friendly to anaerobic sewer biofilms. Abstract: This study systematically investigated the impacts of calcium nitrite addition on the mechanical properties and biofilm communities of concrete-based wastewater infrastructures using sulfate resistant cement through standard tests and DNA sequencing, respectively. The results revealed that setting time and water demand for normal consistency were reduced, but slump, drying shrinkage, and apparent volume of permeable voids increased with calcium nitrite dosage up to 4% weight of cement. The cumulative leached fraction of nitrite, 28-day compressive strength and biofilm communities were not significantly affected by calcium nitrite dosages. The addition of calcium nitrite into concrete is environmentally friendly to wastewater infrastructures.