Micromechanical Modeling of Transport Properties of Cement-Based Composites: Role of Interfacial Transition Zone and Air Voids

Yang, Rongwei; Gui, Qiang; Lemarchand, Éric; Fen‐Chong, Teddy; Li, Kefei

doi:10.1007/s11242-015-0574-x

Cited by 17 publications

(2 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, as shown in Fig. 9, the micro behaviors of cementitious composites with nano fillers can be described, predicted and designed through understanding and controlling the behaviors of nano-core-shell element in combination with the molecule dynamics simulation or multiscale/multiphysics modeling [21,[49][50][51][52].…”

Section: Fig 8 -Diagram Of Relationship Between Nano-core-shell Elemmentioning

confidence: 99%

Nano-core effect in nano-engineered cementitious composites

Han

Zhang

Zeng

et al. 2017

Composites Part A: Applied Science and Manufacturing

Self Cite

303

View full text Add to dashboard Cite

Nanoscale impact can bring big changes in micro-meso-macroscale behaviors of the composites. addition of nano fillers makes cementitious materials stronger, more durable and multifunctional/smart. This paper aims at investigating the underlying mechanism for understanding and controlling the nano-engineered cementitious composites. The nano-core effect is proposed through integrating core-effect with nano effect, and is proved by experimental evidences for the cementitious composites with different nano fillers. The nano-core effect is closely relative to the intrinsic properties of nano fillers, composition and processing of the cementitious composites. The behaviors of the nano-engineered cementitious composites are governed by nano-core effect zone, i.e. nano-core-shell element. It is therefore concluded that the nano-core effect is fundamental for design, fabrication and application of the nano-engineered cementitious composites.

show abstract

Section: Fig 8 -Diagram Of Relationship Between Nano-core-shell Elemmentioning

confidence: 99%

Nano-core effect in nano-engineered cementitious composites

Han

Zhang

Zeng

et al. 2017

Composites Part A: Applied Science and Manufacturing

Self Cite

303

View full text Add to dashboard Cite

show abstract

“…This zone can be linked to the concept of the interfacial transition zone (ITZ), which is defined as a region of a cement paste around aggregate particles in concrete, and is characterized by a local increase in porosity and permeability (Scrivener et al 2004). For cement-based composites, such as mortar and concrete, the ITZ significantly affects the transport properties (Yang et al 2015). Transferred to our case, this region is found between the cement and the steel casing.…”

Section: Discussionmentioning

confidence: 94%

Fluid Flow Simulations of a Large-Scale Borehole Leakage Experiment

et al. 2020

View full text Add to dashboard Cite

Borehole leakage is a common and complex issue. Understanding the fluid flow characteristics of a cemented area inside a borehole is crucial to monitor and quantify the wellbore integrity as well as to find solutions to minimise existing leakages. In order to improve our understanding of the flow behaviour of cemented boreholes, we investigated experimental data of a large-scale borehole leakage tests by means of numerical modelling using three different conceptual models. The experiment was performed with an autoclave system consisting of two vessels bridged by a cement-filled casing. After a partial bleed-off at the well-head, a sustained casing pressure was observed due to fluid flow through the cement–steel composite. The aim of our simulations is to investigate and quantify the permeability of the cement–steel composite. From our model results, we conclude that the flow occurred along a preferential flow path at the cement–steel interface. Thus, the inner part of the cement core was impermeable during the duration of the experiment. The preferential flow path can be described as a highly permeable and highly porous area with an aperture of about $$5\,\upmu \mathrm{m}$$ 5 μ m and a permeability of $$3 \cdot 10^{-12}\,\mathrm{m}^{2}$$ 3 · 10 - 12 m 2 (3 Darcy). It follows that the fluid flow characteristics of a cemented area inside a borehole cannot be described using one permeability value for the entire cement–steel composite. Furthermore, it can be concluded that the quality of the cement and the filling process regarding the cement–steel interface is crucial to minimize possible well leakages.

show abstract