29Si solid state NMR study of tricalcium silicate and cement hydration at high temperature

Masse, Sylvie; Zanni, Hélène; Lecourtier, J.; Roussel, J.C.; Rivereau, Alain

doi:10.1016/0008-8846(93)90177-b

Cited by 58 publications

(21 citation statements)

References 8 publications

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“…According to published data, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] peaks appearing between Ϫ73 and Ϫ78 ppm were assigned to Q 1 silicon units and peaks appearing near Ϫ82 and Ϫ85 ppm to Q 2 silicon units. The substitution of silicon by aluminum shifts the signals ϳ4 ppm toward more positive values; from this fact, the peak appearing at Ϫ82 ppm was ascribed to Q 2 (1Al) silicon and that at Ϫ74 ppm to Q 1 (1Al) silicon.…”

Section: (1) Characterization Of Aas Cement Pastesmentioning

confidence: 99%

Structure of Calcium Silicate Hydrates Formed in Alkaline‐Activated Slag: Influence of the Type of Alkaline Activator

Fernández-Jiménez

Puertas

Sobrados

et al. 2003

Journal of the American Ceramic Society

387

146

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The influence of the alkaline activator (NaOH, waterglass, or Na 2 CO 3 ) on the structure of the hydrated calcium silicate formed in alkali-activated slag (AAS) cement pastes has been investigated by FTIR, 29 Si and 27 Al magic-angle scattering nuclear magnetic resonance, and TEM/EDX techniques. In all cases, the main product formed after 7 d of activation, with activators giving an Na 2 O concentration of 4%, is a semicrystalline calcium silicate hydrate with a dreierkette-type anion. In these structures, linear finite chains of silicate tetrahedra (Q 2 units) are linked to central Ca-O layers, and tetrahedral aluminum occupies bridging positions in the chains. The main chain length and the amount of aluminum incorporated in the tetrahedral chains depend on the activator used. The detection of Q 3 silicon entities in alkaline-activated slags is discussed in relation to the possible formation of cross-linked structures that may be responsible for increased flexural and compressive strengths in AAS mortars. † Q slag ϭ Q 0 /Q 1 (slag); ‡ Q Total ϭ ⌺Q n where Q n stands for Q 1 , Q 2 , and Q 3 units

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Section: (1) Characterization Of Aas Cement Pastesmentioning

confidence: 99%

Structure of Calcium Silicate Hydrates Formed in Alkaline‐Activated Slag: Influence of the Type of Alkaline Activator

Fernández-Jiménez

Puertas

Sobrados

et al. 2003

Journal of the American Ceramic Society

387

146

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“…Temperature accelerates C 3 S hydration . Nonetheless, the joint effect of temperature and the presence of nSA on C–S–H gel nanostructure, which is directly related to its composition, has been scantly studied.…”

Section: Introductionmentioning

confidence: 99%

“…2,12 Temperature accelerates C 3 S hydration. 12,18 Nonetheless, the joint effect of temperature and the presence of nSA on C-S-H gel nanostructure, which is directly related to its composition, has been scantly studied. Brough et al 19 reported that polymerization takes place more rapidly at 40°C than at ambient temperature and obtained an MCL of 8 (octamer species, or chains with eight SiO 4 tetrahedra) in 3 month specimens cured at the former temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature on C₃S and C₃S + Nanosilica Hydration and C–S–H Structure

et al. 2012

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This study aimed to monitor the effect of temperature and the addition of nanosilica on the nanostructure of the C–S–H gel forming during tricalcium silicate (C3S) hydration. Two types of paste were prepared from a synthesized T1 C3S. The first consisted of a blend of deionized water and C3S at a water/solid ratio of 0.425. In the second, a 90 wt% C3S + 10 wt% of nanosilica blend was mixed with water at a water/solid ratio of 0.7. The pastes were stored in closed containers at 100% RH and 25°C, 40°C, or 65°C. The hydration reaction was detained after 1, 14, 28, or 62 d with acetone, and then pastes were studied by 29Si magic angle spinning nuclear magnetic resonance (29Si MAS NMR).The main conclusion was that adding nSA expedites C3S hydration at any age or temperature and modifies the structure of the C–S–H gel formed, two types of C–S–H gel appear. At 25°C and 40°C, more orderly, longer chain gels are initially (1 d) obtained as a result of the pozzolanic reaction between nSA and portlandite (CH) (C–S–HII gel formation). Subsequently, ongoing C3S hydration and the concomitant flow of dimers shorten the mean chain length in the gel.

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“…Now, domestic and overseas scholars have carried out extensive researches upon its mechanical properties and durability, and have achieved many results [3] . However, wholly speaking, ordinary concrete has high cement content and mainly adopts siliceous dust and fly ash [4] as additives, which is not economical and may result in low contribution rate to strength. Plenty of non-hydrated cement particles existing in hardened structure is a waste of resources as well as a hidden danger of volume stability.…”

Section: Introductionmentioning

confidence: 99%

“…Plenty of non-hydrated cement particles existing in hardened structure is a waste of resources as well as a hidden danger of volume stability. Masse, S [4] , AN M [5] , ZHANG S, et al [6] studied the effects of curing system on the strength and micro-structure of RPC, generally using the steam curing systems at different temperatures as curing system. This paper studied the hydration characteristics of the four-grade powder packing low cement system consisting of cement, fly ash, ultra fine limestone powder and siliceous dust as well as the micro-structure features of its hardened body under the premise of extremely low water-bind ratio; also, this paper studied the effects of the dry-heating curing after steam curing on the concrete structure of high volume fine mineral reactive powder and the appearance of hydrates, with the water-bind ratio ranging from 0.16 to 0.20.…”

Section: Introductionmentioning

confidence: 99%

Effects of curing systems on properties of high volume fine mineral powder RPC and appearance of hydrates

Liu

Song

2010

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The effects of different curing systems on the properties of high volume fine mineral powder RPC (reactive powder concrete) and the appearances of hydrates were studied. The experimental results show that dry-heating curing promotes the development of pozzolanic reactivity of fine mineral powder; due to low cement content, 0.20 water-bind ratio and high reactive fine mineral powder content, the strength of RPC increases by around 200% after steam curing and subsequent dry-heating curing. Scanning electron microscopy and energy spectrum diagram showed that: after the high volume fine mineral powder RPC with 0.16 water-bind ratio underwent steam curing and dry-heating curing, there was no significant change in the appearance of hydrates; after the RPC with 0.20 water-bind ratio, the cement content of 150 kg/m 3 and more steel slag powder underwent dry-heating curing, there was a certain change in the appearance of C-S-H, the structure of gel was more compact and was uniformly distributed, and the Ca/Si of C-S-H gel decreased from 1.41 to around 1.20.

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29Si solid state NMR study of tricalcium silicate and cement hydration at high temperature

Cited by 58 publications

References 8 publications

Structure of Calcium Silicate Hydrates Formed in Alkaline‐Activated Slag: Influence of the Type of Alkaline Activator

Structure of Calcium Silicate Hydrates Formed in Alkaline‐Activated Slag: Influence of the Type of Alkaline Activator

Effect of Temperature on C₃S and C₃S + Nanosilica Hydration and C–S–H Structure

Effects of curing systems on properties of high volume fine mineral powder RPC and appearance of hydrates

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29Si solid state NMR study of tricalcium silicate and cement hydration at high temperature

Cited by 58 publications

References 8 publications

Structure of Calcium Silicate Hydrates Formed in Alkaline‐Activated Slag: Influence of the Type of Alkaline Activator

Structure of Calcium Silicate Hydrates Formed in Alkaline‐Activated Slag: Influence of the Type of Alkaline Activator

Effect of Temperature on C3S and C3S + Nanosilica Hydration and C–S–H Structure

Effects of curing systems on properties of high volume fine mineral powder RPC and appearance of hydrates

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Effect of Temperature on C₃S and C₃S + Nanosilica Hydration and C–S–H Structure