Calorimetry in the studies of cement hydration

Gawlicki, M.; Nocuń-Wczelik, Wiesława; Bąk, Łukasz

doi:10.1007/s10973-009-0158-5

Cited by 49 publications

(8 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It means that the hydration of PC is signifi cantly delayed with CAC addition. This fi nding is consistent with the fi ndings of Gu et al [7,9] and Gawlicki et al [25] who stated that this long dormant period may result from a surface coverage of the clinker grains by early hydration of CAC.…”

Section: Rate Of Heat Evolutionsupporting

confidence: 92%

Effect of calcium aluminate cement variety on the hydration of portland cement in blended system

Wang

Schutter

et al. 2014

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

View full text Add to dashboard Cite

Two kinds of CACs with different monocalcium aluminate (CA) contents were used in the PC/CAC (PAC) mixtures. Effects of CA and CACs on the properties of PAC were analyzed by setting times and the compressive strength tests, and also by means of calorimetry, XRD, DTA-TG and ESEM. The experimental results show that the compressive strength of the PAC mortars decreases with increasing content of CAC while it declines sharply with a higher content of CA in CAC. Compared with neat PC paste, the content of calcium hydroxide in hydrates of PAC paste decreases significantly, and the hydration time of PC is prominently prolonged. Additionally, the higher the content of CA in CAC, the more obviously the hydration of PC is delayed, confi rming that the CA phase in CAC plays an important role in the delay of PC hydration.

show abstract

Section: Rate Of Heat Evolutionsupporting

confidence: 92%

Effect of calcium aluminate cement variety on the hydration of portland cement in blended system

Wang

Schutter

et al. 2014

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

View full text Add to dashboard Cite

show abstract

“…This finding and the shape of the curve in general suggest that there are two processes contributing to the heat release. The initial contribution is likely because of the large amount of the C 12 A 7 in the LFS, which can react with water and release a considerable amount of heat in the first few days of hydration [24]. In addition, the reaction of the C 12 A 7 is also known to release aluminum ions, which can further react with the silica in GGBFS and gypsum to form C-S-H gel, react with gypsum to form ettringite, and react with Cl − to form Friedel’s salt [25].…”

Section: Resultsmentioning

confidence: 99%

“…As hydration proceeds, Friedel’s salt and anhydrite peaks decrease in intensity, while the ettringite peaks increase in intensity. This is likely due to a reaction between GGBFS, sulfates, and Friedel’s salt to form ettringite [1,3,24]. There are no significant changes in the peak intensities of L40/G10 as hydration progresses, likely because there are adequate amounts of tetrahedrally coordinated Al and SO 4 2− to maintain a steady amount of ettringite and Friedel’s salt [16].…”

Section: Resultsmentioning

confidence: 99%

Use of Ladle Furnace Slag and Other Industrial By-Products to Encapsulate Chloride in Municipal Solid Waste Incineration Fly Ash

2019

View full text Add to dashboard Cite

Municipal solid waste incineration fly ash (MSWIFA) is a hazardous by-product of waste incineration. The objective of this research is to encapsulate the chloride in MSWIFA and to develop a utilizable construction material using MSWIFA, ground granulated blast-furnace slag (GGBFS), ladle furnace slag (LFS), and gypsum. A secondary objective of the work is to explain the hydration and encapsulation mechanisms in this material system using isothermal calorimetry (IC), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and ion chromatography (IC). The predominant hydration products are ettringite, Friedel’s salt, and C-S-H gel, with Friedel’s salt and C-S-H dominating in systems high in LFS and ettringite and C-S-H gel dominating in systems low in LFS. The chloride encapsulation showed a strong correlation with the Friedel’s salt amount; however, some encapsulation was also likely due to physical binding in the C-S-H gel. In a system with 30% MSWIFA (by mass), the optimal amount of LFS for strength and chloride encapsulation is 20%–40% (by mass).

show abstract

“…The length of induction period varied with the type of PC used to prepare the blend, but is only very little affected by the presence of mineral additions. This indicates that the early reaction was dominated by PC due to the C 3 S dissolution and hydration and the formation of C-S-H and portlandite as noticed in (36)(37)(38), which caused a sharp increase in heat flow after the induction period, the acceleration period (III). The onset of period III was faster for PC H than for PC L , and the heat flow per gram of PC at the maximum of the exothermic heat peak was higher in the presence of the mineral additions.…”

Section: Ternary Blends Contribution To the Early Cement Hydrationmentioning

confidence: 88%

Influence of the synergy between mineral additions and Portland cement in the physical-mechanical properties of ternary binders

et al. 2016

View full text Add to dashboard Cite

ABSTRACT:The paper deals with the synergistic effect of mineral additions on the physical-mechanical performance of ternary blends prepared with different Portland cements (PC). The effect in setting and heat flow release is also analyzed. The mineral additions used are blast furnace slag (BFS), fly ash (FA) and limestone filler (LF). PCs with different C 3 A and alkali content have been tested to study the synergy in ternary blends. Ternary binders with PC low in C 3 A and alkali content achieve similar mechanical strength gain as plain PC and refinement of pore size distribution from early hydration ages due to the acceleration of PC hydration induced by the mineral additions. In contrast, ternary binders with PC higher in C 3 A and alkali content have a delayed in mechanical strength at early hydration ages, but significantly higher at long hydration times. RESUMEN: Prestaciones físico-mecánicas en cementos ternarios dependiendo de la sinergia entre las adiciones minerales y el cemento Portland.El artículo aborda la interacción sinérgica de las adiciones minerales en el rendimiento físico-mecánico de mezclas ternarias preparadas con dos tipos de cemento Portland (PC). Se analiza desde las edades tempranas la contribución en los tiempos de fraguado y en el flujo de calor liberado. Las adiciones minerales usadas son escoria de alto horno, ceniza volante y filler calizo. Los PC utilizados se han seleccionado en base al contenido en C 3 A y álcalis. Mezclas formuladas con PC de bajo contenido en C 3 A y álcalis mantienen desde el inicio una ganancia similar en las prestaciones mecánicas y un refinamiento en el tamaño de poro atribuido a la aceleración inducida por las adiciones minerales en la hidratación inicial del PC. En cambio, mezclas ternarias con un PC con mayor contenido en C 3 A y álcalis tienen más lenta generación de resistencias mecánicas iniciales, pero mayores a medida que avanza la hidratación.

show abstract

Calorimetry in the studies of cement hydration

Cited by 49 publications

References 8 publications

Effect of calcium aluminate cement variety on the hydration of portland cement in blended system

Effect of calcium aluminate cement variety on the hydration of portland cement in blended system

Use of Ladle Furnace Slag and Other Industrial By-Products to Encapsulate Chloride in Municipal Solid Waste Incineration Fly Ash

Influence of the synergy between mineral additions and Portland cement in the physical-mechanical properties of ternary binders

Contact Info

Product

Resources

About