Alkali-activated (or geopolymer) membranes have emerged recently as an alternative for conventional ceramic membranes. Their main benefit is the simple and low-energy manufacturing not requiring sintering, thus potential clearly lower costs, while having largely similar performance materials. In this work, metakaolin, blast furnace slag, their mixture (representing typical low, high, medium Ca-...

The use of natural fibers in reinforced composites to produce eco-friendly materials is gaining more attention due to their attractive features such as low cost, low density and good mechanical properties, among others. This work thus investigates the potential of waste abaca (Manila hemp) fiber as reinforcing agent in an inorganic aluminosilicate material known as geopolymer. In this study, th...

Abstract Carbonation curing differs from weathering carbonation since it is performed intentionally at the early ages of cement hydration. This cure involves applying different levels CO2 (5% to 99%) concrete for a short period time, usually followed by conventional The objective this article was evaluate in metakaolin-based geopolymer concretes, activated with NaOH and Na2SiO3, compare them Po...

This study was undertaken in the context of Cigéo project to investigate use geopolymer for potential applications high level waste cell. The aim evaluate structural evolution potassium metakaolin based as a function time and temperature geological nuclear disposal applications. mechanical properties, local structure, porosity binder composites stored at 0.5 20 months 90 °C were studied. It sho...

This investigation elucidates the mechanical characteristics of geopolymer containing solar panel waste glass. With the SiO2/Na2O molar ratio (S/N = 0.75, 1.0, 1.25, 1.5, 1.75), the percentage of metakaolinite that is replaced by solar panel waste glass (040%), and the curing time of 1, 7, and 28 days as the study variables, the porosity, density, setting time, compressive strength, and flexura...

Silica fume (SF) and Metakaolin are cementitious materials used as admixtures to produce high strength concrete and to reduce the permeability. Also, Silica fume is used to make durable concrete structures in combination with ordinary Portland cement. In places where insufficient or poor curing concrete structures like sea shores, underground structures which undergo severe loss of compressive ...

The aim of the present work was to study influence elevated temperatures on thermal behavior geopolymer cements based incorporation metakaolin with cement kiln dust. Geopolymer composites were synthesized by partially substituted (MK) 0, 20, 30 and 40 wt% dust (CKD). mixture liquid sodium silicate (Na2SiO3) hydroxide (NaOH) used as alkaline activator solution fixed ratio 2.5 concentration 10 Mo...

Geopolymers compete with a number of conventional coatings and few them have already been replaced. The aim this work was the analysis alkali-activated metakaolin-based geopolymers their use as brush-applied coatings, which were chosen due to simplicity cost-effectiveness. Eight prepared AlMgSi aluminum alloy underlying substrate also studied. main characterizations microscopy analysis, showed ...