Journal ArticleDOI
The effect of aluminum, pH, and chemical affinity on the rates of aluminosilicate dissolution reactions
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TLDR
In contrast to what is commonly assumed, the constant pH rates are not independent of chemical affinity at far from equilibrium conditions as mentioned in this paper, rather, the logarithm of these rates for albite and kaolinite are linear functions of aqueous Al concentration over wide ranges of saturation states.About:
This article is published in Geochimica et Cosmochimica Acta.The article was published on 1994-05-01. It has received 469 citations till now. The article focuses on the topics: Aluminosilicate & Dissolution.read more
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Geopolymer technology: the current state of the art
Peter Duxson,Ana Fernández-Jiménez,John L. Provis,Grant C. Lukey,Ángel Palomo,J.S.J. van Deventer +5 more
TL;DR: A brief history and review of geopolymer technology is presented with the aim of introducing the technology and the vast categories of materials that may be synthesized by alkali activation of aluminosilicates as mentioned in this paper.
Journal ArticleDOI
Understanding the relationship between geopolymer composition, microstructure and mechanical properties
Peter Duxson,John L. Provis,Grant C. Lukey,Seth W. Mallicoat,Waltraud M. Kriven,Jannie S.J. van Deventer +5 more
TL;DR: In this paper, a mechanistic model accounting for reduced structural reorganization and densification in the microstructure of geopolymer gels with high concentrations of soluble silicon in the activating solution has been proposed.
OtherDOI
A Compilation of Rate Parameters of Water-Mineral Interaction Kinetics for Application to Geochemical Modeling
TL;DR: In this paper, a general Arrhenius-type rate equation for over 70 minerals, including phases from all the major classes of silicates, most carbonates, and many other non-silicates, were derived from a computer code that simulates an infinitely well-stirred batch reactor, allowing computation of mass transfer as a function of time.
Journal ArticleDOI
Effects of climate on chemical_ weathering in watersheds
Art F. White,Alex E. Blum +1 more
TL;DR: In this paper, the authors evaluated the effect of weathering on chemical weathering by correlating variations on solute concentrations and fluxes with temperature, precipitation, runoff, and evapotranspiration (ET) for a worldwide distribution of sixty-eight watersheds underlain by granitoid rock types.
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The effect of time on the weathering of silicate minerals: why do weathering rates differ in the laboratory and field?
Art F. White,Susan L. Brantley +1 more
TL;DR: In this article, the correlation between decreasing reaction rates of silicate minerals and increasing duration of chemical weathering was investigated for both experimental and field conditions, and it was shown that intrinsic surface area, which increases with the duration of weathering, was responsible for a third of the exponential decrease in the weathering rate.
References
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Journal ArticleDOI
The Activated Complex in Chemical Reactions
TL;DR: In this paper, the probability of the activated state is calculated using ordinary statistical mechanics, and the probability multiplied by the rate of decomposition gives the specific rate of reaction, and necessary conditions for general statistical treatment to reduce to the usual kinetic treatment are given.
Journal ArticleDOI
The kinetics of silica-water reactions
J.D. Rimstidt,H.L. Barnes +1 more
TL;DR: In this article, the authors derived a differential rate equation for silica-water reactions from 0-300°C based on stoichiometry and activities of the reactants in the reaction SiO2(s) + 2H2O(l) = H4SiO4(aq) ( ∂a H 4 SiO 4 ∂t ) P.T.
Journal ArticleDOI
Thermodynamic and kinetic constraints on reaction rates among minerals and aqueous solutions; I, Theoretical considerations
Per Aagaard,Harold C. Helgeson +1 more
Journal ArticleDOI
Thermodynamic and kinetic constraints on reaction rates among minerals and aqueous solutions. II. Rate constants, effective surface area, and the hydrolysis of feldspar
TL;DR: In this article, it was shown that the cross-sectional area of etch pits on hydrolyzed feldspar grains is of the order of 10−9 to 10−8 cm2 and that the ratio of the effective to total surface area (which may or may not change with reaction progress) ranges from <0.01 to 1, depending on the grain size, dislocation density, and the extent of comminution damage on the surfaces of the grains.
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Thermodynamic and kinetic constraints on reaction rates among minerals and aqueous solutions; I, Theoretical considerations
Per Aagaard,Harold C. Helgeson +1 more