Interactions between hydrated cement paste and organic acids: Thermodynamic data and speciation modeling

Windt, Laurent de; Bertron, Alexandra; Larreur-Cayol, S.; Escadeillas, Gilles

doi:10.1016/j.cemconres.2014.12.001

Cited by 41 publications

(23 citation statements)

References 32 publications

(75 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hydronium ion causes the gradual dissolution of the hydrated and anhydrous compounds of the cement matrix, mainly releasing calcium ions. Depending on the chemical conditions and on their formation constants, salts and/or complexes resulting from the reaction between calcium and the anion of the acid may be formed [26]. The aggressiveness of organic acids for the cement matrix depends on three types of parameters: the chemical properties of the acids (pKa, polyacidity), the properties of the calcium salts (solubility, molar volume, affinity for the matrix, mesoscopic shape, etc.…”

Section: Alteration Mechanisms By Organic Acidsmentioning

confidence: 99%

Biodeterioration of concrete in agricultural, agro-food and biogas plants: state of the art and challenges

Bertron¹,

Lavigne

Patapy

et al. 2017

RILEM Tech Lett

Self Cite

View full text Add to dashboard Cite

This article reviews the state of knowledge on the mechanisms of deterioration of concrete by agricultural and agro-industrial effluents, notably breeding effluents and biowaste valorised in anaerobic digestion plants. The main physicochemical characteristics of agricultural effluents are first listed in terms of components that are aggressive for cementitious materials. Then, the main mechanisms of deterioration of the cementitious materials exposed to the effluents are presented, as highlighted by laboratory studies (synthetic effluents and / or models, specific experimental devices) or with real effluents. The paper also points out the scientific and technical advances needed to improve the durability of concrete in these environments.

show abstract

Section: Alteration Mechanisms By Organic Acidsmentioning

confidence: 99%

Biodeterioration of concrete in agricultural, agro-food and biogas plants: state of the art and challenges

Bertron¹,

Lavigne

Patapy

et al. 2017

RILEM Tech Lett

Self Cite

View full text Add to dashboard Cite

show abstract

“…A cement matrix in a medium containing organic acids undergoes acid-base reactions occurring between the acids and the highly alkaline cement phases. In the case of ordinary cement paste, these reactions lead to the formation of calcium salts or complexes and water (Bertron and Duchesne, 2013;De Windt et al, 2015). The volatile fatty acids in anaerobic digestion (acetic, propionic and butyric acids) have very soluble calcium salts (Bertron et al, 2007;Bertron and Duchesne, 2013).…”

Section: Calcium Leaching Phenomenamentioning

confidence: 99%

Mechanisms of cementitious material deterioration in biogas digester

Voegel¹,

Bertron²,

Erable³

2016

Science of The Total Environment

View full text Add to dashboard Cite

Digesters produce biogas from organic wastes through anaerobic digestion processes. These digesters, often made of concrete, suffer severe premature deterioration caused mainly by the presence of fermentative microorganisms producing metabolites that are aggressive towards cementitious materials. To clarify the degradation mechanisms in an anaerobic digestion medium, ordinary Portland cement paste specimens were immersed in the liquid fraction of a running, lab-scale digester for 4weeks. The anaerobic digestion medium was a mixture of a biowaste substrate and sludge from municipal wastewater treatment plant used as a source of anaerobic bacteria. The chemical characteristics of the anaerobic digestion liquid phase were monitored over time using a pH metre, high performance liquid chromatography (HPLC) and ion chromatography (HPIC). An initial critical period of low pH in the bioreactors was observed before the pH stabilized around 8. Acetic, propionic and butyric acids were produced during the digestion with a maximum total organic acid concentration of 50mmolL(-1). The maximum ammonium content of the liquid phase was 40mmolL(-1), which was about seven times the upper limit of the highly aggressive chemical environment class (XA3) as defined by the European standard for the specification of concrete design in chemically aggressive environments (EN 206). The changes in the mineralogical, microstructural and chemical characteristics of the cement pastes exposed to the solid and liquid phase of the digesters were analysed at the end of the immersion period by X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectrometry (EDS) and electron-probe micro-analysis (EPMA). A 700-μm thick altered layer was identified in the cement paste specimens. The main biodeterioration patterns in the bioreactors' solid/liquid phase were calcium leaching and carbonation of the cement matrix.

show abstract

“…Calcium acetate is a calcium salt of acetic acid and acetic acid is one of the main constituents of silage effluent [5], therefore the formation of calcium acetate may be possible. However previous research has stated that calcium acetate is highly soluble and therefore unlikely to form in these conditions [58].…”

Section: Mass Lossmentioning

confidence: 99%

Resistance of geopolymer and Portland cement based systems to silage effluent attack

Aiken

Sha

Kwasny

et al. 2017

Cement and Concrete Research

100

View full text Add to dashboard Cite

Abstract:Traditional Portland cement (PC) concrete has been used for many years in the agricultural industry for the construction of silos and silage effluent storage facilities. However, the acidic nature of the silage effluent produced by silage has led to severe degradation of PC concrete which in turn has significant environmental and financial implications. This study compares the resistance of PC and geopolymer (GP) mortars and pastes to silage effluent over 12 months. The GP samples displayed increased resistance to silage effluent in terms of mass and strength loss. Analysis of microstructure suggests that the increased stability of the reaction products is the main factor behind increased silage effluent resistance when compared with PC. It was also found that pulverised fuel ash (PFA) and ground granulated blast furnace slag (GGBS) blends with a higher PFA content may offer increased long term silage effluent resistance due to the nature of the main binder gel produced in PFA dominant systems.

show abstract

Interactions between hydrated cement paste and organic acids: Thermodynamic data and speciation modeling

Cited by 41 publications

References 32 publications

Biodeterioration of concrete in agricultural, agro-food and biogas plants: state of the art and challenges

Biodeterioration of concrete in agricultural, agro-food and biogas plants: state of the art and challenges

Mechanisms of cementitious material deterioration in biogas digester

Resistance of geopolymer and Portland cement based systems to silage effluent attack

Contact Info

Product

Resources

About