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A platform for research: civil engineering, architecture and urbanism
Influence of Specific SCM on Microstructure and Early Strength of Sustainable Cement Blends
Blended binders combining different hydraulically active materials and inert fillers, have a high potential to improve sustainability of cement and concrete. In this study a portion of ordinary Portland cement (OPC) up to 40 wt.% was replaced by supplementary cementitious material (SCM): two limestone powders (LSP) of different fineness and ground granulated blast furnace slag (GGBFS). Their influence on microstructure and strength development and of blended formulations is presented. While strength development was assessed by compressive strength measurements up to three months, the effects on microstructure were investigated by Mercury intrusion porosimetry and air permeability measurements. The results show that refinement of pore size distribution and altered capillary porosity is strongly influenced by both, the ratio of water to total binder content (w/b) and of water to hydraulically effective portion of binder (w/bhy) related to the effects of combined SCMs. Significantly higher strength gains (between 1st to 28th and 1st to 91st day) of blended mixes were found due to joint contribution of latent-hydraulic reaction of GGBFS and strength accelerating “filler-effect” of inert LSP. Sole influence of inert fillers was found to be significantly higher in case of lower w/b (water content per volume) due to increased packing density.
Influence of Specific SCM on Microstructure and Early Strength of Sustainable Cement Blends
Blended binders combining different hydraulically active materials and inert fillers, have a high potential to improve sustainability of cement and concrete. In this study a portion of ordinary Portland cement (OPC) up to 40 wt.% was replaced by supplementary cementitious material (SCM): two limestone powders (LSP) of different fineness and ground granulated blast furnace slag (GGBFS). Their influence on microstructure and strength development and of blended formulations is presented. While strength development was assessed by compressive strength measurements up to three months, the effects on microstructure were investigated by Mercury intrusion porosimetry and air permeability measurements. The results show that refinement of pore size distribution and altered capillary porosity is strongly influenced by both, the ratio of water to total binder content (w/b) and of water to hydraulically effective portion of binder (w/bhy) related to the effects of combined SCMs. Significantly higher strength gains (between 1st to 28th and 1st to 91st day) of blended mixes were found due to joint contribution of latent-hydraulic reaction of GGBFS and strength accelerating “filler-effect” of inert LSP. Sole influence of inert fillers was found to be significantly higher in case of lower w/b (water content per volume) due to increased packing density.
Influence of Specific SCM on Microstructure and Early Strength of Sustainable Cement Blends
RILEM Bookseries
M.C.F. Cunha, Vítor (editor) / Rezazadeh, Mohammadali (editor) / Gowda, Chandan (editor) / Rudic, O. (author) / Juhart, J. (author) / Tritthart, J. (author) / Krüger, M. (author)
RILEM Spring Convention and Conference ; 2020 ; Guimarães, Portugal
Proceedings of the 3rd RILEM Spring Convention and Conference (RSCC 2020) ; Chapter: 16 ; 165-177
RILEM Bookseries ; 35
2021-07-14
13 pages
Article/Chapter (Book)
Electronic Resource
English