Accelerated tests of hardened cement pastes alteration by organic acids: analysis of the pH effect

Bertron, Alexandra; Duchesne, Josée; Escadeillas, Gilles

doi:10.1016/j.cemconres.2004.09.009

Cited by 106 publications

(67 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This value is still high and representative the range of our previous studies [13,17,18,22], to examine the different chemical species present in solution and their respective concentrations. However, preliminary stability diagrams covered a wider range (from 10 -5 to 1 mol/L) to highlight the major species in solution according to pH and acid concentration.…”

Section: Chemical Conditions Carboxylic Acid Concentrationsmentioning

confidence: 91%

“…Two groups of acids have been identified: (i) acids with soluble salts, such as acetic, butyric, lactic or propionic acids and (ii) acids with slightly soluble to insoluble salts, including malic, oxalic, succinic and tartaric acids [3], [15]. For the first group, alteration mechanisms appear similar to those observed with strong acids such as nitric or hydrochloric acids [3,16,17]. For the second group, the physical and chemical properties of the acid salts (solubility, molar volume, affinity of salt for the cement matrix) seemed to influence the intensity of alteration and a correlation was observed between the molar volumes of the salts and the intensity of alteration of the matrix [18].…”

Section: Introductionmentioning

confidence: 95%

“…Experimental campaigns have pointed out that these acids differ greatly in their aggressiveness toward the cement matrix in terms of alteration kinetics, evaluated through altered layer thicknesses and mass changes [3,13,17]. A summary of the main alteration phenomena observed experimentally on cement matrices exposed to these organic acids (acetic, succinic, citric, and oxalic acids) alone or in mixtures are provided in Table 1.…”

Section: Thermodynamic Datamentioning

confidence: 99%

See 2 more Smart Citations

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

Windt

Bertron

Larreur-Cayol

et al. 2015

Cement and Concrete Research

View full text Add to dashboard Cite

Abstract.Interactions of short-chain organic acids with hydrated cement phases affect structure durability in the agro-food and nuclear waste industries but can also be used to modify cement properties. Most previous studies have been experimental, performed at fixed concentrations and pH, without quantitatively discriminating among polyacidity effects, or complexation and salt precipitation processes. This paper addresses such issues by thermodynamic equilibrium calculations for acetic, citric, oxalic, succinic acids and a simplified hydrated CEM-I. The thermodynamic constants collected from the literature allow the speciation to be modelled over a wide range of pH and concentrations. Citric and oxalic had a stronger chelating effect than acetic acid, while succinic acid was intermediate. Similarly, Ca-citrate and Ca-oxalate salts were more insoluble than Ca-acetate and Ca-succinate salts. Regarding aluminium complexation, hydroxyls, sulphates, and acid competition was highlighted. The exploration of acid mixtures showed the preponderant effect of oxalate and citrate over acetate and succinate.

show abstract

Section: Chemical Conditions Carboxylic Acid Concentrationsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 95%

Section: Thermodynamic Datamentioning

confidence: 99%

See 1 more Smart Citation

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

Windt

Bertron

Larreur-Cayol

et al. 2015

Cement and Concrete Research

View full text Add to dashboard Cite

show abstract

“…The formation of an additional compound is also evident on the surface of the PC paste samples and is discussed further in section 3.4. [35] where three zones are described. Zone 1 is described as the sound zone which is unaltered by the attack.…”

Section: Methodsmentioning

confidence: 99%

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

Aiken

Sha

Kwasny

et al. 2017

Cement and Concrete Research

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

“…Characterization of the degradation process by manure is usually made by destructive testing [6,7], but non-destructive techniques have been little used. Ultrasonic non-destructive techniques are one of the methods frequently used for in situ quality evaluation of concrete structures.…”

Section: Introductionmentioning

confidence: 99%

Assessment of mortar evolution in pig slurry by mechanical and ultrasonic measurements

Segura

Sánchez

Moragues

et al. 2010

Construction and Building Materials

View full text Add to dashboard Cite

Keywords:Ultrasonic velocity Characterization Degradation Fly ash Mortar Pig slurry This work presents the results obtained in a long-term experiment focused on the study of the evolution of cementitious materials immersed in pig slurry at real conditions. Cement mortars were made with four different cement types and immersed in pig slurry for 48 months. Furthermore, to sepárate puré hydration process from pig slurry effect, mortar samples were immersed in water for 12 months at laboratory conditions. Compressive strength, X-ray diffraction and ultrasonic measurements were made in all samples. Ultrasonic measurements were made from ultrasonic images obtained from automatic ultrasonic inspections. Use of ultrasonic images has allowed the extraction of information about the state of the studied materials. An empirical relationship between ultrasonic velocity and compressive strength has been obtained and the long-term effect of pig slurry on cementitious materials has been determined.

show abstract

Accelerated tests of hardened cement pastes alteration by organic acids: analysis of the pH effect

Cited by 106 publications

References 10 publications

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

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

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

Assessment of mortar evolution in pig slurry by mechanical and ultrasonic measurements

Contact Info

Product

Resources

About