Calorimetric study of the early stages of the nanosilica - tricalcium silicate hydration. Effect of temperature

Bosque, I.F. Sáez del; Martínez-Ramírez, S.; Blanco-Varela, María Teresa

doi:10.3989/mc.2015.06814

Cited by 6 publications

(4 citation statements)

References 19 publications

(22 reference statements)

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“…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

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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.

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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

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“…3.3.1 Heat production rate Table 2 lists the values for the hydration curves found for the cements analysed, which were characterised by five periods: (a) pre-induction; (b) induction; (c) acceleration; (d) deceleration; and (e) diffusion [28,29].…”

Section: Conduction Calorimetry Parametersmentioning

confidence: 99%

New additions for eco-efficient cement design. Impact on calorimetric behaviour and comparison of test methods

et al. 2016

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The pursuit of new alternative construction materials has intensified substantially in recent years due to the economic, technical and environmental benefits deriving from their use. The study of the effect of such materials on heat of hydration is of particular importance, for any rise in that parameter may shorten the service life of concrete structures considerably. This paper describes an in-depth study of including clay-based sanitary ware (SW) and construction and demolition (CDW) waste as active additions in clinker manufacture and their effect on the total heat of hydration measured with isothermal and semi-adiabatic calorimetry. Clay-based SW waste induced a greater decline in the heat production rate, temperature rise and total heat than CDW waste. Moreover, the downslopes steepened with increasing replacement ratios. A linear relationship was observed between the values for total heat of hydration found with the two test methods. The type of waste, replacement ratio and the interaction between these two parameters had a significant impact on heat of hydration.

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“…Nano-SiO 2 in cement-based materials usually improves mechanical strength (7)(8)(9)(10)(11)(12)(13)(14)(15)(16), lowers and refines porosity (17), shortens the C 3 S hydration acceleration period, and enhances C-S-H gel precipitation and nucleation (18,19,20). However, another key factor that influences nano-SiO 2 reactivity is the densification state (21,22).…”

Section: Introductionmentioning

confidence: 99%

Combined effect of nano-SiO2 and nano-Fe2O3 on compressive strength, flexural strength, porosity and electrical resistivity in cement mortars

et al. 2018

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The compressive strength, flexural strength, porosity and electrical resistivity properties of cement mortars with nano-Fe2O3 and nano-SiO2 are studied. Amorphous silica is the main component of pozzolanic materials due to its reaction with calcium hydroxide formed from calcium silicate (C3S and C2S) hydration. The pozzolanic reaction rate is not only proportional to the amount of amorphous silica but also to the surface area available for reaction. Subsequently, fine nano-Fe2O3 and nano-SiO2 particles in mortars are expected to improve mortar performance. The experimental results showed that the compressive strength of mortars with nano-Fe2O3 and nano-SiO2 particles were lower than those obtained with the reference mortar at seven and 28 days. It was shown that the nano-particles were not able to enhance mechanical strength on every occasion. The continuous microstructural progress monitored by mercury intrusion porosimetry (MIP) measurements, pore-size distribution (PSD), total porosity and critical pore diameter also confirmed such results.

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Calorimetric study of the early stages of the nanosilica - tricalcium silicate hydration. Effect of temperature

Cited by 6 publications

References 19 publications

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

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

New additions for eco-efficient cement design. Impact on calorimetric behaviour and comparison of test methods

Combined effect of nano-SiO<sub>2</sub> and nano-Fe<sub>2</sub>O<sub>3</sub> on compressive strength, flexural strength, porosity and electrical resistivity in cement mortars

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