Details
| Original language | English |
|---|---|
| Pages (from-to) | 517-525 |
| Number of pages | 9 |
| Journal | Construction and Building Materials |
| Volume | 131 |
| Publication status | Published - 30 Jan 2017 |
Abstract
The performance of fresh concrete could be evaluated in terms of its ability to maintain adequate stability while showing good flowability and deformability during pumping and casting operations. During such operations, the concrete is exposed to very intense external stresses which usually cause a complete breakdown of the interparticle structure, thereby affecting both the rheological and the stability properties of the mix including the resistance against segregation. Hence, guaranteeing the dynamic stability of concrete, which mainly depends on the interparticle structural strength and the viscosity, is of paramount importance. However, unlike the static stability of concrete where a critical yield stress serves as a stability criterion, there is no rheological criterion yet upon which the dynamic stability could be evaluated. In this paper, new rheological measurement and evaluation techniques are introduced with which the yield stress, the viscosity and the interparticle structural strength could be quantified, taking the structural breakdown process into consideration. Moreover, the stability of different mortar compositions was investigated under the influence of vibration in order to assess the effects of the structural breakdown process on the segregation potential. Finally, based on the results of the rheological and the stability investigations, a new rheology based criteria is introduced with which the dynamic stability of mortars under the influence of vibration could be assessed.
Keywords
- Dynamic stability, Interparticle structure, Mortar, Paste, Rheology, Segregation, Structural breakdown, Vibration, Viscosity, Yield stress
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Building and Construction
- Materials Science(all)
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In: Construction and Building Materials, Vol. 131, 30.01.2017, p. 517-525.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Rheological characterization of the structural breakdown process to analyze the stability of flowable mortars under vibration
AU - Abebe, Yared Assefa
AU - Lohaus, Ludger
N1 - Publisher Copyright: © 2016 Elsevier Ltd Copyright: Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/1/30
Y1 - 2017/1/30
N2 - The performance of fresh concrete could be evaluated in terms of its ability to maintain adequate stability while showing good flowability and deformability during pumping and casting operations. During such operations, the concrete is exposed to very intense external stresses which usually cause a complete breakdown of the interparticle structure, thereby affecting both the rheological and the stability properties of the mix including the resistance against segregation. Hence, guaranteeing the dynamic stability of concrete, which mainly depends on the interparticle structural strength and the viscosity, is of paramount importance. However, unlike the static stability of concrete where a critical yield stress serves as a stability criterion, there is no rheological criterion yet upon which the dynamic stability could be evaluated. In this paper, new rheological measurement and evaluation techniques are introduced with which the yield stress, the viscosity and the interparticle structural strength could be quantified, taking the structural breakdown process into consideration. Moreover, the stability of different mortar compositions was investigated under the influence of vibration in order to assess the effects of the structural breakdown process on the segregation potential. Finally, based on the results of the rheological and the stability investigations, a new rheology based criteria is introduced with which the dynamic stability of mortars under the influence of vibration could be assessed.
AB - The performance of fresh concrete could be evaluated in terms of its ability to maintain adequate stability while showing good flowability and deformability during pumping and casting operations. During such operations, the concrete is exposed to very intense external stresses which usually cause a complete breakdown of the interparticle structure, thereby affecting both the rheological and the stability properties of the mix including the resistance against segregation. Hence, guaranteeing the dynamic stability of concrete, which mainly depends on the interparticle structural strength and the viscosity, is of paramount importance. However, unlike the static stability of concrete where a critical yield stress serves as a stability criterion, there is no rheological criterion yet upon which the dynamic stability could be evaluated. In this paper, new rheological measurement and evaluation techniques are introduced with which the yield stress, the viscosity and the interparticle structural strength could be quantified, taking the structural breakdown process into consideration. Moreover, the stability of different mortar compositions was investigated under the influence of vibration in order to assess the effects of the structural breakdown process on the segregation potential. Finally, based on the results of the rheological and the stability investigations, a new rheology based criteria is introduced with which the dynamic stability of mortars under the influence of vibration could be assessed.
KW - Dynamic stability
KW - Interparticle structure
KW - Mortar
KW - Paste
KW - Rheology
KW - Segregation
KW - Structural breakdown
KW - Vibration
KW - Viscosity
KW - Yield stress
UR - http://www.scopus.com/inward/record.url?scp=85000997442&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2016.11.102
DO - 10.1016/j.conbuildmat.2016.11.102
M3 - Article
AN - SCOPUS:85000997442
VL - 131
SP - 517
EP - 525
JO - Construction and Building Materials
JF - Construction and Building Materials
SN - 0950-0618
ER -