Strength, sorptivity, pore structure variation of concrete suffered acidic attack

Title: Strength, sorptivity, pore structure variation of concrete suffered acidic attack
Author(s): D. Zhu, X. Feng, H. Yin
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 685 - 694
Total Pages: 10
Nb references: 15
Language: English

Abstract: Rapid development of industry increased acidic medium concentration in environments,and the concrete durability caused by acidic attack had been paid more attention. In the paper, five acid solutions with different pH values, different SO42- concentrations were prepared to simulate the attack of acidic rains. The strength variation, sorptivity and pore structure of concrete were measured after acidic attack, together with a dry-wet cycle regimen for 150 days. Results showed that, after attack of acidic solutions with SO42-, the strength of concrete reduced at first, then increased, and reduced at the late attack ages. The types of reaction products, forming process, pore structure variation during the corrosive reaction govern the performance variation of the concrete. Although the porosity of cover concrete became smaller after acidic attack with SO42-, its microstructure deteriorated with attacking time owing to the expansive stress. On the other hand, after the attack of acidic solution without SO42-, the strength decreased and sorptivity increased, due to the decreased quality of pore structure of cover concrete.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00