Geopolymer for use in heavy metals adsorption, and advanced oxidative processes: A critical review

Mechanical properties of alkali activated flyash/Kaolin based geopolymer concrete

Metakaolin and fly ash alkali-activated mortars compared with cementitious mortars at the same strength class

Recent progress in environmentally friendly geopolymers: A review.

Geopolymer concrete as sustainable material: A state of the art review

Due to environmental pollution form cement industries, some efforts for alternative construction material are increasing. Recently, geopolymer concrete has drawn attention of researchers and engineers because of its lower carbon print and better mechanical property over Portland cement concrete. According to previous studies, geopolymer concrete results almost up to 90% reduction in carbon dioxide (CO2) emission to atmosphere. Mechanical properties of geopolymer concrete such as compressive strength, durability, sulfate resistance, early strength and low shrinkage are better than Portland cement concrete. In addition, the appropriate usage of one ton of fly ash earns one carbon-credit redemption value of about 20 Euros, and hence earned monetary benefits through carbon-credit trade.Therefore, this paper presents a review on the fly ash-based geopolymer concrete. The paper mainly covers composition, mixing and curing process, benefits, limitations and applications of alkali activated fly ash based geopolymer concrete.

Review on Alkali-Activated Fly Ash Based Geopolymer Concrete

Eco-friendly fibre reinforced geopolymer concrete: A critical review on the microstructure and long-term durability properties

Abstract. This paper presents the effect of polyvinyl alcohol (PVA) fibre on the bond strength in geopolymer concrete. The main focus of the study is to investigate how bond performance is affected by varying the amount of PVA fibre content. The PVA fibre content of 0 %, 0.2 %, 0.4 %, 0.6 % and 0.8 % by volume of concrete were utilized. Alkali activated class F fly ash was used to prepare the concrete specimens. Moreover, the Ordinary Portland cement (OPC) specimen was also prepared to conduct the comparative study. The results showed that the application of PVA fibre improves the bond resistance between the pullout bar and concrete matrix. It has been investigated that the utilization of PVA fibre in geopolymer concrete improves up to 25.9 % bond strength as compared with the concrete without PVA fibre. The addition of PVA fibre provides a more ductile mode of failure in both geopolymer and OPC concrete than to the concrete without PVA fibre. For the different percentages of PVA fibre used, the specimen with 0.6 % PVA fibre shows maximum compressive strength, splitting and bond strength. The comparative study reveals that the specimen with and without PVA fibre blended geopolymer concrete shows higher bond strength than OPC concrete.

Bond strength in PVA fibre reinforced fly ash-based geopolymer concrete

http://www.cell.com/article/S2405844022033035/pdf

The effect of reinforcement ratio on the flexural performance of alkali-activated fly ash-based geopolymer concrete beam

This paper presents more convenient deflection function that properly substitutes slow converging series function by Naiver for simply supported quadrilateral thin plate. The formulation of the deflection function was conducted by using variational approach. During formulation, Rayleigh-Ritz procedures was used and coordinate function that satisfies kinematic boundary condition and the minimum potential energy principle was developed. In addition to coordinate function, modification factor was applied to the main function for curve fitting purpose. To validate the current study, comparisons were done with Navier’s solution and finite element analysis. The results shown that the deviation for mid-point deflection of current study was very small, i.e. around 0.03%, from Navier’s solution. Furthermore, it has been investigated that finite element analysis also resulted closer result with current study.

/pdf/an-approximate-deflection-function-for-simply-supported-4pawhfa8by.pdf

Kefiyalew Zerfu

Papers

Review on Alkali-Activated Fly Ash Based Geopolymer Concrete

Eco-friendly fibre reinforced geopolymer concrete: A critical review on the microstructure and long-term durability properties

Bond strength in PVA fibre reinforced fly ash-based geopolymer concrete

The effect of reinforcement ratio on the flexural performance of alkali-activated fly ash-based geopolymer concrete beam

An approximate deflection function for simply supported quadrilateral thin plate by variational approach