TY - JOUR
T1 - Influence of cement type on resistance to attack from two carboxylic acids
AU - Dyer, Thomas
N1 - The author would like to thank Mr Andrew Forsyth for assistance with the experimental work reported in this paper. The author also wishes to acknowledge the use of the EPSRC-funded National Chemical Database Service hosted by the Royal Society of Chemistry.
PY - 2017/10
Y1 - 2017/10
N2 - In a number of circumstances, concrete may be required to possess resistance to organic acids. These are frequently carboxylic acids. This paper examines the effect of two such acids – acetic and butyric – on hardened cement paste specimens made from three cement types – Portland cement (PC), a combination of PC and fly ash (PC/FA), and a calcium sulfoaluminate cement (CSA). Specimens were exposed to solutions of the acids and deterioration characterized in terms of mass loss and pH measurements, micro-CT scanning, and chemical and mineralogical analysis. Additionally geochemical modelling was used to further examine the mechanisms involved during acid attack. The CSA cement was most resistant to attack, with the PC paste displaying the least resistance. This resistance has been partly attributed to the higher acid neutralization capacity of CSA cement. However, this paper demonstrates that the enhanced performance is most probably the result of a denser microstructure.
AB - In a number of circumstances, concrete may be required to possess resistance to organic acids. These are frequently carboxylic acids. This paper examines the effect of two such acids – acetic and butyric – on hardened cement paste specimens made from three cement types – Portland cement (PC), a combination of PC and fly ash (PC/FA), and a calcium sulfoaluminate cement (CSA). Specimens were exposed to solutions of the acids and deterioration characterized in terms of mass loss and pH measurements, micro-CT scanning, and chemical and mineralogical analysis. Additionally geochemical modelling was used to further examine the mechanisms involved during acid attack. The CSA cement was most resistant to attack, with the PC paste displaying the least resistance. This resistance has been partly attributed to the higher acid neutralization capacity of CSA cement. However, this paper demonstrates that the enhanced performance is most probably the result of a denser microstructure.
KW - Acid attack
KW - Portland cement
KW - Fly ash
KW - Calcium sulfoaluminate cement
KW - Acetic
KW - Butyric
U2 - 10.1016/j.cemconcomp.2017.07.004
DO - 10.1016/j.cemconcomp.2017.07.004
M3 - Article
SN - 0958-9465
VL - 83
SP - 20
EP - 35
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
ER -
