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A platform for research: civil engineering, architecture and urbanism
Rheological and Mechanical Properties of Alkali-Activated Hybrid Matrix for Self-consolidating Concrete
Abstract The objective of this study is to evaluate the flow behavior, build-up kinetics, and mechanical properties of an alkali-activated hybrid matrix using different concentrations of NaOH. The investigated mixtures showed different rheological behaviors depending on the NaOH concentration. The combination of Portland cement and fly ash contributed to the formation of a rigid network when the activator is used at a concentration of 2 mol/L. At this low concentration, the chemical reaction seems to be strongly accelerated. This resulted in an increase in the yield stress, plastic viscosity, and rigidification rate of the mixtures. However, when the concentration of NaOH increased to 14 mol/L, only cement contributed to the development of rigidity, and fly ash did not show any contribution. This resulted in relatively low yield stress, plastic viscosity, and rigidification rate. Moreover, the obtained test results revealed that the compressive strength of mortar mixtures made with cement - fly ash hybrid matrix is higher than that of fly ash-based mortar mixtures.
Rheological and Mechanical Properties of Alkali-Activated Hybrid Matrix for Self-consolidating Concrete
Abstract The objective of this study is to evaluate the flow behavior, build-up kinetics, and mechanical properties of an alkali-activated hybrid matrix using different concentrations of NaOH. The investigated mixtures showed different rheological behaviors depending on the NaOH concentration. The combination of Portland cement and fly ash contributed to the formation of a rigid network when the activator is used at a concentration of 2 mol/L. At this low concentration, the chemical reaction seems to be strongly accelerated. This resulted in an increase in the yield stress, plastic viscosity, and rigidification rate of the mixtures. However, when the concentration of NaOH increased to 14 mol/L, only cement contributed to the development of rigidity, and fly ash did not show any contribution. This resulted in relatively low yield stress, plastic viscosity, and rigidification rate. Moreover, the obtained test results revealed that the compressive strength of mortar mixtures made with cement - fly ash hybrid matrix is higher than that of fly ash-based mortar mixtures.
Rheological and Mechanical Properties of Alkali-Activated Hybrid Matrix for Self-consolidating Concrete
Rifaai, Yasser (author) / Yahia, Ammar (author) / Mostafa, Ahmed (author) / Aggoun, Salima (author) / Kadri, El-Hadj (author)
2019-08-25
9 pages
Article/Chapter (Book)
Electronic Resource
English
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