Influence of slag on leaching behavior of cement mortar lined in ductile iron pipe under a flowing solution
| Autor: | He Shaoli, Xiao-Bao Zuo, Olawale Ayinde, Guang-Ji Yin, Yu-Juan Tang |
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| Rok vydání: | 2017 |
| Předmět: |
Chemical substance
Materials science Scanning electron microscope Mechanical Engineering Metallurgy 0211 other engineering and technologies 02 engineering and technology Ductile iron pipe engineering.material 021001 nanoscience & nanotechnology law.invention Volumetric flow rate Magazine Mechanics of Materials law Ductile iron 021105 building & construction lcsh:TA401-492 engineering lcsh:Materials of engineering and construction. Mechanics of materials General Materials Science Leaching (metallurgy) Composite material 0210 nano-technology Porosity |
| Zdroj: | Materials & Design, Vol 114, Iss, Pp 612-622 (2017) |
| ISSN: | 0264-1275 |
| DOI: | 10.1016/j.matdes.2016.11.096 |
| Popis: | In order to investigate the influence of slag on the leaching behavior of cement mortar lined in ductile iron pipe in a flowing solution, two types of ductile iron pipe specimens lined with ordinary- and 40% slag- cement mortar are firstly prepared, then, an accelerated leaching experiment on the prepared specimens is carried out by using a 6 M ammonium chloride solution at a flow rate of 0.3 m/s. The parameters of linings at different leaching times, such as porosity, pore size distribution, phase composition and Calcium-Silicon (Ca/Si) ratio, were analyzed by using the saturation-drying weighing method, mercury intrusion porosimetry (MIP), X-ray diffraction (XRD) and scanning electron microscopy in back scattered electron mode (ESEM-BSE) measurements. Results show that, the mixture of 40% slag in cement-mortar lining can reduce its initial porosity and Calcium-Silicon ratio, and improve its pore size distribution and phase composition. In the accelerated leaching process, the porosity, phase composition and Calcium-Silicon ratio of the slag-cement-mortar lining with 40% slag have smaller change than that of the ordinary-cement-mortar lining without slag, and it indicates that the addition of slag can effectively improve the calcium leaching resistance of cement-mortar lining in ductile iron pipes in water supply engineering. Keywords: Slag, Cement-mortar lining, Calcium leaching, Ductile iron pipe, Flowing solution |
| Databáze: | OpenAIRE |
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