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

被引：42

作者：

De Windt, Laurent ^{[1
]}

Bertron, Alexandra ^{[2
]}

Larreur-Cayol, Steeves ^{[2
]}

Escadeillas, Gilles ^{[2
]}

机构：

[1] PSL Res Univ, MINES ParisTech, Ctr Geosci, F-77305 Fontainebleau, France

[2] Univ Toulouse, UPS INSA LMDC, F-31077 Toulouse 04, France

来源：

CEMENT AND CONCRETE RESEARCH | 2015年 / 69卷

关键词：

Reaction; Degradation; Organic acids; Radioactive waste; Agricultural effluents; DEGRADATION; KINETICS; BITUMEN; DISSOLUTION; SOLUBILITY; REPOSITORY; NITRATE; TESTS;

D O I：

10.1016/j.cemconres.2014.12.001

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

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 modeled 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, sulfates, and acid competition was highlighted. The exploration of acid mixtures showed the preponderant effect of oxalate and citrate over acetate and succinate. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：25 / 36

页数：12

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