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Production, microstructure and hydration of sustainable self-compacting concrete with different types of filler
Graphical abstract Display Omitted
Highlights Production of economic sustainable SCC with high partial replacement of cement. First work to analyse the micro-characteristics of the interfacial transition zone (ITZ) of sustainable SCC. Addition of LP leads to less homogenous microstructure of in both the ITZ and the cement paste. LP gave an indication to the acceleration effect on the hydration. The analysis approved its inactivity. Fly ash addition showed its consistency for the production of sustainable SCC.
Abstract Production, microstructure and hydration characteristics of sustainable self-compacting concrete (SCC) are investigated with two types of filler having significant differences mainly in chemical composition and physical properties. The purpose is to show how different fillers at high cement replacement levels can affect the composition, microstructural and hydration characteristics at early age. Several techniques, comprising X-ray diffraction, scanning electron microscopy (SEM) linked with energy-dispersive X-ray (EDX) analysis, image analysis, mercury intrusion porosimetry and thermo-gravimetric analysis, were used in order to demonstrate the effect of these two fillers at high replacement proportions. The two types of sustainable SCC produced had a compressive strength of 50–60MPa and used the same water to binder ratio. The replacement rate of both limestone powder (LP) and fly ash (FA) was about 33% of the total binder (450kg/m3). In spite of the equal water to binder ratio and approximately the same compressive strength grade at 28-days, limestone powder self-compacting concrete (LP–SCC) had a different microstructure and hydration products from the fly ash self-compacting concrete (FA–SCC). The results indicate that the fly ash was the more suitable for the production of sustainable SCC.
Production, microstructure and hydration of sustainable self-compacting concrete with different types of filler
Graphical abstract Display Omitted
Highlights Production of economic sustainable SCC with high partial replacement of cement. First work to analyse the micro-characteristics of the interfacial transition zone (ITZ) of sustainable SCC. Addition of LP leads to less homogenous microstructure of in both the ITZ and the cement paste. LP gave an indication to the acceleration effect on the hydration. The analysis approved its inactivity. Fly ash addition showed its consistency for the production of sustainable SCC.
Abstract Production, microstructure and hydration characteristics of sustainable self-compacting concrete (SCC) are investigated with two types of filler having significant differences mainly in chemical composition and physical properties. The purpose is to show how different fillers at high cement replacement levels can affect the composition, microstructural and hydration characteristics at early age. Several techniques, comprising X-ray diffraction, scanning electron microscopy (SEM) linked with energy-dispersive X-ray (EDX) analysis, image analysis, mercury intrusion porosimetry and thermo-gravimetric analysis, were used in order to demonstrate the effect of these two fillers at high replacement proportions. The two types of sustainable SCC produced had a compressive strength of 50–60MPa and used the same water to binder ratio. The replacement rate of both limestone powder (LP) and fly ash (FA) was about 33% of the total binder (450kg/m3). In spite of the equal water to binder ratio and approximately the same compressive strength grade at 28-days, limestone powder self-compacting concrete (LP–SCC) had a different microstructure and hydration products from the fly ash self-compacting concrete (FA–SCC). The results indicate that the fly ash was the more suitable for the production of sustainable SCC.
Production, microstructure and hydration of sustainable self-compacting concrete with different types of filler
Mohammed, Mahmoud Khashaa (author) / Dawson, Andrew Robert (author) / Thom, Nicholas Howard (author)
Construction and Building Materials ; 49 ; 84-92
2013-07-21
9 pages
Article (Journal)
Electronic Resource
English
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