Kai Li

Kai Li
Hunan University · College of Civil Engineering

Doctor of Philosophy

About

25
Publications
2,513
Reads
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206
Citations
Introduction
Dr. Kai Li is currently working as an associate professor at the college of Civil Engineering, Hunan University. His research interests mainly include: (1) Transport-based property assessment of cementitious materials; (2) Multiscale modelling techniques for concrete material and structure; (3) Mixture design of high performance concrete and sustainable construction materials.
Additional affiliations
October 2012 - September 2017
Delft University of Technology
Position
  • PhD candidate
Description
  • Research topic: Durability-based properties investigation of cementitious materials by simulation techniques.
September 2009 - June 2012
Wuhan University of Technology
Position
  • Master's Student

Publications

Publications (25)
Article
Understanding the size effect of UHPC under compression is fundamental and essential for component and/or structure design and analysis. This paper investigated the size effect of UHPC cubes (40, 70.7, 100, and 150 mm) under compression through considering the steel fiber characteristics (1%, 2%, 3% short straight, short hooked, and long hooked ste...
Article
Crack healing is an effective way to recover the mechanical properties and improve the durability of concrete. This can be achieved either by autogenous healing or adding healing agents into cementitious materials. Although quantitative evaluation on self-healing capacity of cracked concrete is difficult, sealing ratio obtained by water permeabilit...
Article
Engineering structures of concrete are generally recognized to be rarely fully water-saturated. The water transportation process in unsaturated cementitious materials offers therefore a relevant problem the understanding of which can be crucial in assessing concrete’s degradation and failure mechanisms. In recent years, the number of published pape...
Article
Scientific design of the composition of UHPC is important in achieving desired elastic modulus and prediction. In this paper, an analytical model based on composition through using a multi-scale model and homogenization method is proposed to analyze the effective elastic moduli of UHPC at micro-, meso-, and macro-scales. Volume fractions and elasti...
Article
Model construction is a key and indispensable step to understand the internal structure of concrete at the micro-/mesoscale level, which affects its properties in practice. In this paper, a practical and applicable method is proposed for generating the mesoscale structure of plain and fiber reinforced concretes. In this method, cell fracture algori...
Article
Research on cementitious materials can provide geometric data on structural topics of interest. Such structural data should be subjected to a process called “geometric averaging” to be coupled on the engineering level with properties like strength, stiffness or permeability. The prime purpose of this work is to demonstrate that the mathematics unde...
Article
Use of steel fiber in high performance cement composite (HPCC) can enhance its strength and toughness, which is achieved through stress transfer from fiber to matrix at interface. In this study, a numerical model in Finite Element Method and three analytical models were proposed to predict bond behaviors between HPCC matrix and three different shap...
Article
Various systems for simulating particulate matter are developed and used in concrete technology for producing virtual cementitious materials on the different levels of the microstructure. Basically, the systems can be classified as two distinct families, namely random sequential addition systems (RSAs) and discrete element methods (DEMs). The first...
Article
The interfacial transition zones (ITZs) are supposed to promote fluid transport through concrete. As a consequence, one would expect an increase in permeability with an increasing aggregate fraction. This has been shown in some experiments, however, the opposite effect is observed as well. The permeability ratio of ITZ to matrix seems to be a key p...
Article
To assess the pore size of virtual cementitious materials, the star volume method (SVM) can be considered an effective tool. Unfortunately, the SVM requires a large number of plane sections in each of the very large number of random points, resulting in a time-consuming and expensive operation. As a more economical alternative, this paper presents...
Article
Realistically simulating fresh and hardening cementitious materials renders possible understanding controversial issues existing in the field of concrete technology. The experimental studies on the impact of the interfacial transition zone (ITZ) on permeability of concrete reveal two controversial results. The first involves the concept of promotin...
Article
Although an earlier developed numerical methodology for permeability estimation of cement pastes can provide satisfactory results in comparison with experiments, it would be of engineering interest to find a simpler way to perform the same task. This method referred to by ''the shorter approach " is presented in this paper. In the approach, water p...
Article
Realistic three-scale simulation by DEM of particulate materials like concrete is nowadays possible by fast developments in computer technology. This would be an attractive alternative for systematic physical experimenting that is more time-consuming, labour-intensive and thus expensive. The paper discusses the simulation on meso-level of the aggre...
Article
Full-text available
A novel methodology is described for porosimetry as well as for water transport through the pore system in dynamic DEM-based virtual cementitious materials. The pore network topology, the pore size distribution and the pore connectivity are assessed on the basis of a robotics-inspired pore delineation method and star volume measurements. Permeabili...
Article
Non-destructive methods such as ultrasonic wave, impact echo, and ground penetrating radar were used to study the internal structure of early-age concrete. The results indicate that the ultrasonic, stress, and electromagnetic wave velocity can reflect well the variation of the internal structure in concrete. With the influence of cement hydration,...
Article
Full-text available
A grand canonical Monte Carlo simulation method was used to analyze the adsorption characteristic of water in kaolin. To understand the adsorption mechanisms, the numerical analysis and the corresponding experiments at different temperatures and pressures with the exchange of various cations were carried out. The results show that the experimental...
Article
The results of first-principles calculations about (100) surface of CaO and adsorption of water molecules on the CaO (100) have been presented. Both surface parameters (atomic structures and electronic configurations) and adsorption parameters (bond, charge and energy) of H2O on CaO (100) surface are obtained using density functional theory calcula...
Article
In this paper, we study the structure characteristic of calcium silicate hydrate (C-S-H) gels by using molecular dynamic simulation. We mainly focus on two types of calcium silicate hydrate (C-S-H) gels, namely, C-S-H(I) and C-S-H(II). Our simulations indicate that, in accordance with experiments, two types of C-S-H gels both present the structural...
Article
Modification of structure and thermodynamic properties of montmorillonite is studied by molecular dynamics simulation. The simulation results show that the pure montmorillonite system is unstable in nature, while the structure of doping-modified montmorillonite is more stable. In simulation process, the activity between the molecule and impurity io...

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Projects

Projects (2)
Project
Understanding the mechanism of water transport in partially saturated concrete
Project
Water saturation degree is a crucial parameter that determines the permeability of cementitious materials. The goal of this project is to develop an effective numerical method for permeability calculation of unsaturated cement-based materials, which is also useful for durability assessment of concrete structures in service.