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Effects of Leaching Behavior of Calcium Ions on Compression and Durability of Cement-Based Materials with Mineral Admixtures
Department of Civil Engineering, National Ilan University, 1 Shen-Lung Road, Ilan 260, Taiwan
Institute of Nuclear Energy Research, Atomic Energy Council, Executive Yuan, Taoyuan 325, Taiwan
* Author to whom correspondence should be addressed.
Received: 11 January 2013; in revised form: 29 March 2013 / Accepted: 24 April 2013 / Published: 7 May 2013
Abstract: Leaching of calcium ions increases the porosity of cement-based materials, consequently resulting in a negative effect on durability since it provides an entry for aggressive harmful ions, causing reinforcing steel corrosion. This study investigates the effects of leaching behavior of calcium ions on the compression and durability of cement-based materials. Since the parameters influencing the leaching behavior of cement-based materials are unclear and diverse, this paper focuses on the influence of added mineral admixtures (fly ash, slag and silica fume) on the leaching behavior of calcium ions regarding compression and durability of cemented-based materials. Ammonium nitrate solution was used to accelerate the leaching process in this study. Scanning electron microscopy, X-ray diffraction analysis, and thermogravimetric analysis were employed to analyze and compare the cement-based material compositions prior to and after calcium ion leaching. The experimental results show that the mineral admixtures reduce calcium hydroxide quantity and refine pore structure through pozzolanic reaction, thus enhancing the compressive strength and durability of cement-based materials.
Keywords: leaching; calcium ion; durability; cement-based materials; mineral admixture
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MDPI and ACS Style
Cheng, A.; Chao, S.-J.; Lin, W.-T. Effects of Leaching Behavior of Calcium Ions on Compression and Durability of Cement-Based Materials with Mineral Admixtures. Materials 2013, 6, 1851-1872.
Cheng A, Chao S-J, Lin W-T. Effects of Leaching Behavior of Calcium Ions on Compression and Durability of Cement-Based Materials with Mineral Admixtures. Materials. 2013; 6(5):1851-1872.
Cheng, An; Chao, Sao-Jeng; Lin, Wei-Ting. 2013. "Effects of Leaching Behavior of Calcium Ions on Compression and Durability of Cement-Based Materials with Mineral Admixtures." Materials 6, no. 5: 1851-1872.