Pore structure degradation of different cement mortars exposed to sulphuric acid
Author
Marcos Ortega, José; García Vera, Victoria Eugenia; Solak, Afonso Miguel; Tenza Abril, Antonio JoséKnowledge Area
Ciencia de los Materiales e Ingeniería Metalúrgica; Física Aplicada; Ingeniería Química; Química-FísicaSponsors
The authors express their thanks to C.T.S. Spain for providing the ethyl silicate used in this study. The authors also acknowledge the University of Alicante Technical Research Services (SSTTI) for the analysis performed using their equipment, which was financed by the EU, MINECO, and Generalitat Valenciana (State Programme for Knowledge Generation and Scientific and Technological Strengthening of the R+D+i System and P.O. FEDER 2007-2013 funds).Realizado en/con
Universidad de AlicantePublication date
2019-12-05Publisher
MDPIBibliographic Citation
Ortega JM, García-Vera VE, Solak AM, Tenza-Abril AJ. Pore Structure Degradation of Different Cement Mortars Exposed to Sulphuric Acid. Applied Sciences. 2019; 9(24):5297. https://doi.org/10.3390/app9245297Peer review
SiKeywords
MicrostructureDurability
Acid rain
Zinc stearate
Ethyl silicate
Nanosilica
Abstract
Acid attack causes the deterioration of construction material surfaces. The objective of this study was to investigate the degradation of different types of cement mortar in terms of variations in pore size distribution obtained by mercury intrusion porosimetry (MIP), mass loss, and compressive strength. The mortars were manufactured with nanosilica, zinc stearate, and an ethyl silicate coating. After curing (28 days), the samples were subjected to acid exposure for 90 days, immersed ina solution (3% w/w) of sulphuric acid (H2SO4). The results indicate that the mortars showed a more refined microstructure, with a higher proportion of smaller pores (<100 nm) compared to the control mortar. The 28-day and 90-day compressive strength variations of mortars were also determined by observing pronounced reduction due to the appearance of expansive compounds responsible for microcracking.
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