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

Abstract

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.

Ordinary Portland Cement composition for the optimization of the synergies of supplementary cementitious materials of ternary binders in hydration processes

“…These results are also related to a lower delay of the setting times of the blends based on OPC-1 compared to the reference and a higher contribution to the initial heat flow of the SCMs in these blends than in the blends based on OPC-2 [15].…”

“…For this reason, there are many recent studies on ternary and even quaternary blends. Some of these studies were carried out in the development of low-pH cementitious materials for high level radioactive waste (HLRW) repositories [11][12][13], while others are mainly focused on their mechanical and/or durability properties [3,5,14,15] and other studies involve microstructural processes [16][17][18], including thermodynamic modelling [19]. Nevertheless, some differences can be seen in the papers published and it seems that better mechanical strength gain is obtained in ternary blends at early hydration ages when using an OPC with a low C 3 A content and/or alkali content [3,5,20,21], while the initial synergy is lower when the OPC used has a higher content [16,17,[22][23][24][25].…”

Improvement of the Concrete Permeability by Using Hydrophilic Blended Additive

“…These powdered materials complete the fine portion of the granulometric curve of cement without a relevant increment on water demand, improving the cement packing and blocking the capillary pores. They also constitute nucleation sites of calcium hydroxide crystals and calcium silicate hydrate gels (C-S-H gels) at early hydration ages, accelerating the hydration of clinker particles, especially the C 3 S [19,20,21,22,23]. Thus, the filler effect promotes a decrease in the total porosity or a refinement of the pore size distribution with the subsequent decrease of the concrete water permeability.…”

Numerical and Experimental Analysis of Self‐Protection in Reinforced Concrete due to Application of Mg–Al–NO2Layered Double Hydroxides

“…Other authors attribute this shoulder with the formation of AFm. [53] Cumulative heat curves of LDH-NO 2 pastes had higher heat production between 30 (4%) and 45 h (2%) of hydration. The total heat release in this range was higher with the increase in LDH in the pastes compared with the paste with CEM I only.…”