Neutralization of concreteunder weak sufuric acid environment

Title: Neutralization of concreteunder weak sufuric acid environment
Author(s): Toshio Yonezawa, Yasunori Matsufuji, Shizuo Harada, Tomoyuki Koyama, Etsutaka Maeda, Kyoichi Tanaka, Fumio Oshida
Paper category : conference
Book title: 2nd International Symposium on Service Life Design for Infrastructures
Editor(s): K. van Breugel, Guang Ye, Yong Yuan
Print-ISBN: 978-2-35158-096-7
e-ISBN: 978-2-35158-097-4
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 99 - 106
Total Pages: 8
Nb references: 6
Language: English

Abstract: Concrete structures are vulnerable to such acid environments as hot springs, sea origin soils and sewage plants. It is normally difficult for concrete to resist acid attacks under the environment of pH less than 3 to 4. It is rather important to understand durability of concrete under weak acid environment of pH 4 to 5 where concrete structures are normally exposed to the acid without any protection. In this study characteristics of neutralization of concrete were studied based on 15 years exposure tests to soil of pH 4 to 5 and atmosphere of SO2 concentration of 5 to 40 ppm. It is shown that neutralization of concrete under the weak sulfuric acid environment is very different from ordinary carbonation; a dormant period of neutralization exists due to densified surface layer. Based on the obtained results, neutralization depth equations for concrete under weak sulfuric acid environment are proposed.

Online publication: 2011-04-20
Publication type : full_text
Public price (Euros): 0.00