The Damage of Concrete in Mg2++SO4 2- and Mg2++SO4 2-+Cl- Solution
Author(s): Zhanfei Wang, Dingyi Yang, and Wu Shen
Paper category: Proceedings
Book title: 3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): Changwen Miao, Wei Sun, Jiaping Liu, Huisu Chen, Guang Ye and Klaas van Breugel
Publisher: RILEM Publications SARL
Publication year: 2016
Total Pages : 17
Language : English
Abstract: The durability of concrete has attracted significant attention over the past several years and is still a research hotspot until now. This paper use long-term natural immersion method, the damage of concrete specimen in Mg2++SO4 2- and Mg2++SO4 2-+Cl- solution was studied.The failure mode of the concrete specimen in Mg2++SO4 2- and Mg2++SO4 2-+Cl- solution was observed. The relative dynamic elastic modulus (RDME) and mass change of concrete specimen were also calculated in this experiment. The results show that the main failure mode of concrete include pulverization and corrosion pit in Mg2++SO4 2- and Mg2++SO42-+Clsolution. In the early time of erosion, the RDME of concrete is decreased by the increase of the Mg2+ concentration in Mg2++SO4
2- solution. However, with the increase of the corrosion time, the RDME of concrete is increased by the increase of the magnesium concentration. In the Mg2++SO4 2-+Cl- solution, the rule of RDME of concrete is not changed by the Cl-.
However, the RDME of concrete specimen that exposed to MgSO4 attack was delayed by the Cl- and was decreased by the increase of the Cl- concentration. The mass change of concrete specimen in MgSO4 and MgSO4+NaCl solution is slowly rise in the early time of erosion. However, with the increase of the corrosion time, the mass change of concrete was increased quickly; The increasing time of the mass change of concrete is delayed by Cl- and the mass change of concrete specimen is decreased by the increase of Cl- concentration in the Mg2++SO4 2-+Cl- solution.
Online publication : 2016
Publication type : full_text
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