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http://dx.doi.org/10.14346/JKOSOS.2012.27.4.068

An Experimental Study on Evaluation of Repair Mortars with CAC (Calcium Aluminate Cement) for Sewer Pipe  

Chung, Jee-Seung (Department of Railroad Civil Engineering, Dongyang University)
Kang, Weon-Dae (Office of Farmland & Irrigation Development, Korea Rural Community Corporation)
Publication Information
Journal of the Korean Society of Safety / v.27, no.4, 2012 , pp. 68-75 More about this Journal
Abstract
The biogenic corrosion of mortars adopted in sewage repair by sulfuric acid-producing bacteria was considered in this paper. Calcium aluminate cement (CAC) was known to resist microbiologically-induced corrosion significantly better than portland and blended portland cement.In this study, CAC as well portland cement mortars were tested as main binder to evaluate the corrosion resistance by the chemical immersion test. Replacement ratios of CAC were changed as 0, 20, 40, 50, 60% of OPC binder and 0, 2, 4, 6% of EVA(Ethylene Vinyl Acetate) were also adopted to increase properties of CAC repair mortars in sewage application. Setting time, compressive strength, acid resistance and adhesive strength were measured for various experiments. As a results of the experiments, the proper formulation of repair mortars was found at 40% of CAC and 4% of EVA. Finally, the CAC mortars adopted in field sewer pipe and were demonstrated to superior in adhesion and workability.
Keywords
biogenic corrosion; mortar; sewer pipe; CAC(calcium aluminate cement); acid resistance;
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