Geopolymer concrete: A review of some recent developments

Fly ash-based geopolymer: clean production, properties and applications

Clean production and properties of geopolymer concrete; A review

Recent progress in low-carbon binders

Flexural strength and elastic modulus of ambient-cured blended low-calcium fly ash geopolymer concrete

Setting and mechanical properties of alkali-activated fly ash/slag concrete manufactured at room temperature

The purpose of this study is to investigate the shrinkage characteristics of alkali-activated fly ash/slag (henceforth simply AFS) and the factors affecting it. A series of tests were conducted to determine the chemical shrinkage, autogenous shrinkage and drying shrinkage. The microstructures and reaction products were also characterized through XRD and SEM/EDS analyses. An increase in the slag content from 10% to 30% resulted in a denser matrix and showed a higher Ca/Si ratio of C–N–A–S–H in the microstructure. Higher sodium silicate and slag contents in a mixture caused more chemical, autogenous, and drying shrinkage, but led to a higher compressive strength. From the test results, it can be concluded that the autogenous shrinkage of AFS mortar occurs mainly due to self-desiccation in hardened state rather than volume contraction by chemical shrinkage in fresh state. The AFS paste showed higher drying shrinkage than ordinary Portland cement (OPC), which may be caused by the higher mesopore volume of the AFS paste compared to that of OPC paste.

Shrinkage characteristics of alkali-activated fly ash/slag paste and mortar at early ages

Fresh and hardened properties of alkali-activated fly ash/slag pastes with superplasticizers

Reactivity and reaction products of alkali-activated, fly ash/slag paste

This study aims to investigate the influence of the slag content on the chloride and sulfuric acid resistances of alkali-activated fly ash/slag (AFS) paste. A series of tests were conducted to examine the effects of reaction products and their contents on the chloride and sulfuric acid resistance capabilities. It was shown from the tests that the deterioration of the AFS binder due to a sulfuric acid attack was caused by 1) the corrosion by means of SO42− penetration through the surface of the AFS binder, which is associated with permeable voids and a rate of water absorption and 2) the corrosion of the reaction products resulting from the different degrees of resistance to sulfuric attack between the C-(A)-S-H and the N-A-S-H. Variation of the slag content led to differences in the reaction product content of the AFS binder, clearly affecting the chloride-binding capacity and the resistance to chloride penetration.

Influence of the slag content on the chloride and sulfuric acid resistances of alkali-activated fly ash/slag paste

Namkon Lee

Papers

Setting and mechanical properties of alkali-activated fly ash/slag concrete manufactured at room temperature

Shrinkage characteristics of alkali-activated fly ash/slag paste and mortar at early ages

Fresh and hardened properties of alkali-activated fly ash/slag pastes with superplasticizers

Reactivity and reaction products of alkali-activated, fly ash/slag paste

Influence of the slag content on the chloride and sulfuric acid resistances of alkali-activated fly ash/slag paste