http://www.personal.psu.edu/faculty/g/u/gur/cement%20for%20the%20future.pdf

Alkali-activated fly ashes: A cement for the future

The Role of Inorganic Polymer Technology in the Development of ‘Green Concrete’

Understanding the relationship between geopolymer composition, microstructure and mechanical properties

Advances in alternative cementitious binders

New cements for the 21st century: The pursuit of an alternative to Portland cement

Performance of FA-based geopolymer concretes exposed to acetic and sulfuric acids

The cement industry is seeking alternative approaches to reduce the high energy and environmental costs of Portland cement manufacture. One such alternative is belite cement. In the present study clinkers with high (36–60%) belite contents were obtained at 1350 °C from raw mixes consisting of ceramic waste and the fluxing/mineralised pair CaF 2 /CaSO 4 . The factors found to affect the mineralogical composition and the clinker phase polymorphs obtained were the lime saturation factor (LSF), the presence of ceramic waste and the addition of CaF 2 and CaSO 4 . The reactivity of these belite clinkers with water was analysed with isothermal conduction calorimetry. A statistical study was then conducted on the findings to determine the effect of each variable when the response signals were peak heat flow rate and the time needed to reach that peak. The statistical analysis identified the optimal experimental conditions to be a LSF of 90%, a CaSO 4 content of 2.60%, and the absence of both ceramic waste and CaF 2 .

Belite cements obtained from ceramic wastes and the mineral pair CaF2/CaSO4

The paper describes the effect of carbon fibre on alkaliactivated slag mortar (AAS) mechanical strength, volume stability and reinforcing steel corrosion, compared to its effect on the same properties in Portland cement (PC) properties. Mechanical strength and volume stability tests were performed as set out in the respective Spanish UNE standards. The corrosion rate of steel embedded in the specimens studied was determined from polarization resistance analysis. One of the findings of the study performed was that carbon fibre failed to improve AAS or CP mortar strength. As far as volume stability is concerned, the inclusion of carbon fibres in AAS with a liquid/solid ratio of 0.5 reduced drying shrinkage by about 50%. The effect of carbon fibre on PC mortars differed from its effect on AAS mortars. Studies showed that in the presence of carbonation, steel corrosion reached higher levels in carbon-fibre reinforced AAS mortars; the inclusion of 1% carbon fibre improved corrosion resistance perceptibly in these same mortars, however, when exposed to chloride attack.

/pdf/comportamiento-de-morteros-de-escoria-activada-alcalinamente-342varweex.pdf

Comportamiento de morteros de escoria activada alcalinamente con adición de fibras de carbón

This paper presents the state-of-the-art on hydraulic behaviour of the blast furnace slags. It analyzes different aspects such as characteristics and influence of its vitreous phase structure, its chemical composition, mechanisms that rule its hydration process, activators and activating process mechanisms, etc. 
At the same time, the paper presents results obtained from a chemical and mineralogical characterization of Spanish blast furnace slags.

/pdf/escorias-de-alto-horno-composicion-y-comportamiento-2okbq3495s.pdf

Francisca Puertas

Papers

Performance of FA-based geopolymer concretes exposed to acetic and sulfuric acids

Belite cements obtained from ceramic wastes and the mineral pair CaF2/CaSO4

Comportamiento de morteros de escoria activada alcalinamente con adición de fibras de carbón

Escorias de alto horno: composición y comportamiento hidráulico

Studies on degradation of lime mortars in atmospheric simulation chambers