Abstract This research aimed to present the improvement of cementitious material in high-volume fly ash using only one alkali activator. Fly was used as a partial replacement for Portland cement type I, varying from 0 60% by weight binder. Concentrations NaOH 0.00 1.25 molar were Paste properties and mortar compressive strength at ages 3, 7, 14, 28, 60, 90 days water curing investigated. The re...

Abstract One of the critical factors affecting performance alkali-activated slag (AAS) is nature and dose alkali activator. The activator type can play a significant role during transition from pastes to mortars or concretes. Therefore, three basic sodium activators (water glass, carbonate, hydroxide) same molarity 4M Na + were used prepare AAS-based with different volume fractions siliceous sa...

Alkali-activated materials are promising low-carbon alternatives to Portland cement; however, there remains an absence of a fundamental understanding the effect different activator types on their reaction products at atomic scale. Solid-state 27Al and 29Si magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy 1H–29Si cross-polarization MAS NMR used reveal anion nanostructure,...

To make full use of the circulating fluidized bed fly (CFB-FA), rich-water carbide slag was used as alkali-activator to promote hydration CFB-FA and prepare fly-based geopolymer (CFB-FAG). The fundamental properties, mechanical acid alkali-resistance CFB-FAG were investigated. optimum content is 25%. it indicates that can excellent properties without high-temperature heat treatment. alkali resi...

Abstract Based on the knowledge that exists today, it is generally accepted there are basic parameters and characteristics to obtain effective mixtures for their use in 3D printing. Rheological behavior setting time (initial final) those determine workability, as well speed nature of hardening molded pastes and, a result, final framework integrity resulted structure. Among promising options pri...

In the current study, effect of SiO 2 /Na O ratio in Sodium silicate (Na 3 ) solution, Na /NaOH and molarity NaOH on compressive strength geopolymer concrete. A mix design is formulated with various mixes are casted alkali activator solution (AAS) / fly ash (FA) =0.5 constant content. The molar altered from 1.50 to 3.00 for different ratios (2.0, 2.5 3.0) also molarities (8M,10M,12M,14M,16M 18M...

This work investigates the effects of mixture parameters on slump flow and compressive strength a new type alkali-activated binder-based ultra-high concrete (AAB-UHSC) before after exposure to high temperatures. The innovative UHSC adopts combination sodium silicate (SS) potassium carbonate (PC) as activator. Compared with alkali hydroxide that is currently used in existing AAB-UHSC, salts are ...

The combustion of fossil fuels results in creating a lot solid wastes such as fly ash and slag. However, these environmentally unfriendly materials can be used raw material for alkali activation – geopolymerization. Although have been successfully industrial production several decades, its use does not achieve the level potential. Today, to sustainable construction industry, alternative cement ...