Drying shrinkage of alkali-activated binders are recognized as one the most important properties towards quality assurance binders. In this study, results experimental studies and predictive models developed to determine drying alkali - activated blast furnace-fly ash mortars presented discussed. Different parameters were altered in study such content GGBFS, FA, activator modulus (Ms), curing t...

Purification of pea (Pisum sativum) seedling NAD kinase by DEAE-cellulose column chromatography resulted in loss of activity, due to dissociation of an activator from the enzyme. The purified enzyme preparation, which was almost completely inactive, regained the activity when the activator was added back.The activator was purified 320-fold by ion exchange chromatographies. The activator was sus...

Alkali-activated materials have the potential to replace Portland cement in certain applications. To better understand these binders’ properties, it is relevant study their rheological behaviour at early ages, like case of paste. There are already many studies on available literature, using fly ash, metakaolin, and ground granulated blast furnace slag as precursors. However, this discusses beha...

ABSTRAKBertambahnya populasi penduduk berbanding lurus dengan kebutuhan infrastruktur, salah satunya meningkatnya beton yang berdampak buruk pada pencemaran lingkungan. Upaya untuk mengurangi tersebut adalah pembuatan ramah lingkungan geopolimer. Bahan utama geopolimer agregat dan binder terdiri dari fly ash alkali aktivator. Pada penelitian ini dilakukan analisis mengetahui pengaruh variasi ak...

Abstract In this paper, the composition and properties of two different activated calcinated clays were investigated under selected curing conditions. The tendency metabentonite metakaoline to form geopolymers zeolites was by FTIR spectroscopy, TGA DSC techniques, PXRD, HT-PXRD, SEM, BET-N 2 adsorption analyses. selection optimal sample compositions done on a basis preliminary results obtained ...

Alkali-activated binders (AABs) offer the opportunity to upcycle a variety of residues into products that can have added value. Although AABs are reported superior high-temperature performance, their thermal behavior is heavily governed by microstructure. The present study, therefore, evaluates effect varying fly ash:slag ratios, activator modulus (Ms), and high temperatures on microstructure A...

Abstract In this work the influence of alkaline activator on immobilization lead and copper in alkali-activated blast furnace slag was investigated. A total five alkali activators were used; sodium waterglass, potassium hydroxide, hydroxide carbonate. The leaching test according to ?SN EN 12457°-4 used evaluate level heavy metals, leached solutions analyzed by ICP-OES. For a better understandin...

Abstract This study replaced fly ash with palm oil fuel (POFA) in geopolymer paste and mortar. The alkaline activator was a mixture of sodium silicate solution hydroxide ratio 2.5. Three variables were evaluated: the raw material combination (100% 25% POFA substituted to ash), mass alkali (60/40, 65/35, 70/30), NaOH molarity (8 M 10 M). mortar utilized based on highest compressive strength past...

The present study focused on developing Alkali Activated Fine Aggregate (AAFA) by palletization method. AAFA was manufactured using Ground Granulated Blast Furnace Slag (GGBS) and alkali activator solution at ambient conditions. Sodium hydroxide of six molarity sodium silicate to ratio 2.5 used. AACA's properties are similar Natural except for flakiness elongation index. water absorption Abrasi...

This paper describes the experimental investigation carried out to develop the geopolymer concrete based on alkali-activated rice husk ash (RHA) by sodium hydroxide with sodium silicate. Effect on method of curing and concentration of NaOH on compressive strength as well as the optimum mix proportion of geopolymer mortar was investigated. It is possible to achieve compressive strengths of 31 N/...