Ukrainczyk, Neven ; Thiedeitz, Mareike ; Kränkel, Thomas ; Koenders, Eddie ; Gehlen, Christoph (2020)
Modeling SAOS Yield Stress of Cement Suspensions: MicrostructureBased Computational Approach.
In: Materials, 13 (12)
doi: 10.3390/ma13122769
Article, Bibliographie
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Abstract
Two static yield stress models, one known as YODEL and the newly proposed BreakPro, based on interparticle bond breaking probability, were employed to comparatively simulate the yield stress of cement suspensions, induced by oscillatory rheological tests with small amplitude oscillatory shear (SAOS). This yield stress occurs at a critical strain in the order of 0.01%, and is commonly attributed to the limit of the linear viscoelastic domain, where attractive forces bridge the cement particles and form a flocculated particle network. YODEL is based on van der Waals (vdW) interaction forces to describe the yield stress for flow onset at a critical strain of a few percent, developed for simple nonreactive particulate suspensions. However, due to the high pH and reactivity of cementitious suspensions, their particle interaction forces are much higher than vdW. Therefore, until now, the YODEL adaptations to cementitious suspensions did not explicitly consider the microstructuralbased salient feature of the original model, but used it as an implicit fitting parameter to scale the average attractive force. In this paper, the force is inversely estimated using the full power of the two microstructuralbased models, presenting a new mathematical tool for investigating the fragility of the rigid percolated structure of cement suspensions. The model parameters were calibrated on measured yield stresses obtained by SAOS measurements in a highsensitivity rheometer. The estimated forces were found to be 5.57 (BreakPro) and 1.43 (YODEL) times higher than typical van der Waals forces. The YODEL percolation threshold of 21% turned out to be significantly lower than the one found by the BreakPro model (37%). This indicated that BreakPro modeling assumptions are better suited for the description of yield stress at SAOS critical strain than the YODEL model.
Item Type:  Article 

Erschienen:  2020 
Creators:  Ukrainczyk, Neven ; Thiedeitz, Mareike ; Kränkel, Thomas ; Koenders, Eddie ; Gehlen, Christoph 
Type of entry:  Bibliographie 
Title:  Modeling SAOS Yield Stress of Cement Suspensions: MicrostructureBased Computational Approach 
Language:  English 
Date:  2020 
Place of Publication:  Basel 
Publisher:  MDPI 
Journal or Publication Title:  Materials 
Volume of the journal:  13 
Issue Number:  12 
Collation:  17 Seiten 
DOI:  10.3390/ma13122769 
Corresponding Links:  
Abstract:  Two static yield stress models, one known as YODEL and the newly proposed BreakPro, based on interparticle bond breaking probability, were employed to comparatively simulate the yield stress of cement suspensions, induced by oscillatory rheological tests with small amplitude oscillatory shear (SAOS). This yield stress occurs at a critical strain in the order of 0.01%, and is commonly attributed to the limit of the linear viscoelastic domain, where attractive forces bridge the cement particles and form a flocculated particle network. YODEL is based on van der Waals (vdW) interaction forces to describe the yield stress for flow onset at a critical strain of a few percent, developed for simple nonreactive particulate suspensions. However, due to the high pH and reactivity of cementitious suspensions, their particle interaction forces are much higher than vdW. Therefore, until now, the YODEL adaptations to cementitious suspensions did not explicitly consider the microstructuralbased salient feature of the original model, but used it as an implicit fitting parameter to scale the average attractive force. In this paper, the force is inversely estimated using the full power of the two microstructuralbased models, presenting a new mathematical tool for investigating the fragility of the rigid percolated structure of cement suspensions. The model parameters were calibrated on measured yield stresses obtained by SAOS measurements in a highsensitivity rheometer. The estimated forces were found to be 5.57 (BreakPro) and 1.43 (YODEL) times higher than typical van der Waals forces. The YODEL percolation threshold of 21% turned out to be significantly lower than the one found by the BreakPro model (37%). This indicated that BreakPro modeling assumptions are better suited for the description of yield stress at SAOS critical strain than the YODEL model. 
Uncontrolled Keywords:  cement paste, rheology, small amplitude oscillatory shear (SAOS), yield stress, mathematical modeling 
Additional Information:  This article belongs to the Special Issue Rheology of Reactive, Multiscale, Multiphase Construction Materials 
Classification DDC:  600 Technology, medicine, applied sciences > 624 Civil engineering and environmental protection engineering 
Divisions:  13 Department of Civil and Environmental Engineering Sciences 13 Department of Civil and Environmental Engineering Sciences > Institute of Construction and Building Materials 
Date Deposited:  16 Jan 2024 08:18 
Last Modified:  16 Jan 2024 08:18 
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Modeling SAOS Yield Stress of Cement Suspensions: MicrostructureBased Computational Approach. (deposited 15 Jan 2024 14:11)
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