Journal ArticleDOI
Studies using 27Al MAS NMR of AFm and AFt phases and the formation of Friedel's salt
Martyn Jones,Donald E. Macphee,John A. Chudek,Geoffrey Hunter,R. Lannegrand,R. Talero,S. N. Scrimgeour +6 more
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TLDR
In this paper, the magic angle spinning (MAS) NMR spectroscopy was used to study the chemical environment of 27Al-bearing phases in Portland cement-based concrete.About:
This article is published in Cement and Concrete Research.The article was published on 2003-02-01. It has received 105 citations till now. The article focuses on the topics: Portland cement & Friedel's salt.read more
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Durability of concrete — Degradation phenomena involving detrimental chemical reactions
TL;DR: In this paper, the mechanisms that govern the transport of ions, moisture, and gas are described, and different chemical degradation phenomena are reviewed, such as sulfate attack from external sources and formation of ettringite and thaumasite.
Journal ArticleDOI
Controlling the reaction kinetics of sodium carbonate-activated slag cements using calcined layered double hydroxides
TL;DR: In this article, Na 2 CO 3 -activated slag cements were produced from four different blast furnace slags, each blended with a calcined layered double hydroxide (CLDH) derived from thermally treated hydrotalcite.
Journal ArticleDOI
Electrokinetic Potential of Hydrated Cement in Relation to Adsorption of Chlorides
TL;DR: In this paper, surface charge mechanism of cement hydrates and its relation to adsorption of chloride ions are investigated, and it can be concluded that C-S-H is the dominant phase in terms of chloride adorption in HCP.
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Chloride resistance of concrete and its binding capacity: Comparison between experimental results and thermodynamic modeling
TL;DR: In this article, the effect of chloride binding on concrete resistance is assessed by thermodynamic modeling and compared with chloride content measured with acid and water extraction, showing that chloride binding is strongly related to the hydration degree of the cement and of the mineral admixtures.
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Characterization of Cement Minerals, Cements and Their Reaction Products at the Atomic and Nano Scale
TL;DR: In this paper, a review of recent advances and highlights in characterization methods for cement minerals, cements and their reaction products is presented, focusing on X-ray and neutron diffraction, and on nuclear magnetic resonance methods.
References
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Journal ArticleDOI
Mechanism of Friedel's salt formation in cements rich in tri-calcium aluminate
TL;DR: In this article, the pore solutions from mortars containing NaCl and CaCl 2 added during mixing were analyzed, and it was shown that in the presence of NaCl the Friedel's salt forms by two separate mechanisms; an adsorption mechanism, and an anion exchange mechanism.
Journal ArticleDOI
High-resolution NMR of quadrupolar nuclei in rotating solids
TL;DR: In this article, a spin-independent formula for the interpretation of the complicated lineshapes has been derived for high-resolution NMR spectra of sodium 23Na nuclei in rapidly rotating powder samples of zeolites.
Journal ArticleDOI
Development of chloride-resisting concrete using fly ash
Ravindra K. Dhir,Martyn Jones +1 more
TL;DR: In this paper, low-lime fly ash can be used to develop chloride-resistant concrete by improving both its physical resistance to the ingress of chlorides and binding capacity of these ions in the cover zone.
Journal ArticleDOI
Effect of calcium chloride on the durability of pre-tensioned wire in prestressed concrete
TL;DR: In this paper, it has been concluded that while there is a tendency for a large proportion of the added calcium chloride to react with the hydrating cement at normal temperatures, the residual small amount of free chloride always retained in solution will give an appreciable chloride concentration in solution and will cause a certain amount of corrosion.
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