The corrosion rate and microstructure of Portland cement and calcium aluminate cement-based concrete mixtures in outfall sewers: A comparative study

被引：48
|
作者：
Kiliswa, Moses W. [1 ]
Scrivene, Karen L. [2 ]
Alexander, Mark G. [1 ]
机构：
[1] Univ Cape Town, Concrete Mat & Struct Integr Res Unit, Dept Civil Engn, Private Bag X3, ZA-7701 Rondebosch, South Africa
[2] Ecole Polytech Fed Lausanne, LMC, CH-1015 Lausanne, Switzerland
来源：
CEMENT AND CONCRETE RESEARCH | 2019年 / 124卷
基金：
新加坡国家研究基金会;
关键词：
Calcium aluminate cement; Concrete sewer corrosion; Scanning electron microscopy;
D O I：
10.1016/j.cemconres.2019.105818
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This paper presents a comparative study on the corrosion rate and microstructural characteristics of Portland cement (PC) and calcium aluminate cement (CAC)-based concrete mixtures subjected to microbially-induced sulphuric acid (biogenic H2SO4) attack for 120 months in an outfall sewer. The higher amount of the amorphous AH(x) within the CAC-based concrete matrix provides a higher neutralisation capacity to the attacking acid, thus giving it better performance than PC-based concrete mixtures during biogenic H2SO4 attack. In addition the results show that the biogenic corrosion rate of PC-based concrete mixtures increases with the cement content while that of CAC-based concrete mixtures decreases with the cement content.
引用
收藏
页数：13
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