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Education
September 2012 - February 2017
September 2006 - July 2007
September 2001 - June 2006
Publications
Publications (48)
The disadvantage of textile-reinforced concrete (TRC) composite was the sensibility with the cracking of the cementitious matrix. So, the addition of short fibres or powder in different natures to improve the ductility of concrete could be a solution to overcome this weakness. This can lead to an alternative material that has remarkable tensile pro...
Bê tông cốt lưới dệt (BTCLD) ngày càng được sử dụng rộng rãi trong kỹ thuật xây dựng hạ tầng cơ sở để gia cường kết cấu xuống cấp, xuất hiện vết nứt trong quá trình sử dụng. Nhờ vào lớp nền bằng bê tông hạt mịn (BTHM) ổn định nhiệt, BTCLD cho thấy hiệu quả gia cường tốt hơn so với Polymer cốt sợi FRP trong trường hợp cấu kiện bê tông cốt thép (BTCT...
Several analytical models have been proposed to estimate the maximum support pressure exerting on the tunnel face during the tunnelling corresponding to the blow-out failure analysis. However, most of those models deal with homogeneous soil. Numerical solution, laboratory tests, and data from real works were used to verify those analytical models,...
Textile-based composites have been studied extensively in the past two decades as they are used in constructing newly fabricated structural elements. This paper presents numerical results of lattice modelling of textile-reinforced concrete in which the damage behaviour model was considered by cracking or crushing for the cementitious matrix. The la...
In case of a wellbore drilled in poro-thermo-elastic rock, the process of wellbore drilling will result in thermic, hydraulic and mechanical phenomena which occur simultaneously and interact with each other. This study presents the analysis of the stress state around the wellbore located in the saturated rock at depth based on a fully coupling ther...
The need to rebuild and upgrade old structures has grown in recent years, particularly in large urban areas. These renovation and upgrade activities frequently affect the structural load of the building, eventually increasing the loads acting on the foundation. This paper illustrates a case study in which the cement grouting method was used to impr...
Sự khuếch tán ion clorua là nguyên nhân chính dẫn đến ăn mòn cục bộ cốt thép trong bê tông. Nghiên cứu về ảnh hưởng của sự khuếch tán ion clorua đối với ứng xử ăn mòn của thép có tầm quan trọng đối với việc bảo vệ chống ăn mòn. Bài báo trình bày nghiên cứu thực nghiệm và mô phỏng số bằng mô hình lưới lattice để khảo sát ảnh hưởng của mức độ tải trọ...
The stability of the tunnel face during tunneling is one of the major criteria for the design and construction of the tunnel. Collapse and blowout are two modes of tunnel face failure during the excavation. The cover-to-diameter ratio is one of the main parameters controlling these failure modes. Several analytical solutions have been proposed to e...
Recently, researches have been used Artificial Neural Network (ANN) to predict the early-age thermal cracking of rectangle piers. But ANN has not resulted for different types of concrete piers. This article presents an evaluation of the early-age thermal characteristics of mass concrete piers with four distinct cross-sectional shapes. A finite elem...
Recent works have showed that the secondary creep of concrete under sustained high load level of load-to-strength ratio is likely due to a strong coupling between damage and drying shrinkage, which locally occurs in the fracture process zone. The scope of this work is to develop a simplified damage-poromechanical model for the secondary creep of co...
The lightweight concrete (LWC), whose aggregate is the keramzit (i.e. expanded clay), presents as a potential material for construction in marine environments. However, only a few studies have dealt with the durability of the lightweight expanded clay aggregate concrete and in particular, the chloride diffusion coefficient of this material under se...
Để làm giảm ứng suất nhiệt trong tấm bê tông xi măng mặt đường ô tô lớp cách ly giữa đáy tấm và lớp móng đường được sử dụng để làm giảm lực ma sát và lực dính đáy tấm đến một giá trị nào đó. Trong tính toán tấm bê tông xi măng mặt đường cứng hiện nay ở Việt Nam, thường giả thiết giữa tấm và nền hoặc là không có ma sát hoặc là dính chặt với nhau. Đi...
This paper considers the fluid flow through a porous medium containing intersecting fractures and presents three main analytical findings, namely: (1) mass exchange between fractures and surrounding matrix at the fracture intersection; (2) fluid potential solution (pressure field) within the whole domain under the form of a single singular integral...
![Fig. 2 Micro-petrographic observation of the Bourgogne limestone [34]. 251](profile/Ngoc-Vu-41/publication/361425548/figure/fig1/AS:11431281189579380@1695118421432/Micro-petrographic-observation-of-the-Bourgogne-limestone-34-251_Q320.jpg)
This article derives the effective poroelastic properties of N-layered composite assemblage. The derivation is based on the Hashin composite sphere assemblage (CSA) model and the linear elastic solution of n-layer coated inclusion-reinforced materials proposed by Hervé and Zaoui. The contribution of this study consists in the consideration of the p...
Vietnam there is Hanoi capital with more than 10 million inhabitants, but still have no underground railway. Therefore, traffic jams have been a huge problem in Hanoi recent years. It happens daily trapping hundred thousand of vehicles, wasting time and billions of dollars, causing problems in all aspects of the society. The design and construction...
The secondary creep of Fiber-Reinforced Concrete (FRC) under high sustained stress levels is a key issue for structural durability when considering the capacity to guarantee small crack widths under serviceability states. This study investigates the time-dependent deformation of FRC beams under loading level P s /P 0 greater than 80% (P s is the lo...
The investigation of safe mud pressure window of horizontal wellbore drilled in the saturated rock by accounting for the combined effect of anisotropy and uncertainty is the main purpose of this work. To this aim, the deterministic solution of collapse and fracture initiation pressures are firstly presented in three cases that describe the behavior...
In comparison with fiber-reinforced polymer (FRP) composite, the textile-reinforced concrete (TRC) presents stability in mechanical performance at elevated temperatures thanks to a thermal protection layer by the cementitious matrix. This paper presents the experimental characterization and analytical modeling for fire performance of carbon TRC und...
Chloride ions penetrated into reinforced concrete member causes rebar corrosion and induces the volume expansion of the rebar and cracks of concrete cover. This study aims to predict the chloride ingress in the reinforced concrete member and its operational service life by using a lattice model. Concrete is considered at the mesoscale, which consti...
Mesoscopic and macroscopic hydromechanical lattice simulations are performed for studying the tension stiffening behavior, the change in permeability, and their linking of a tensioned reinforced normal strength concrete (NSC) member. In the lattice framework, the hydromechanical coupling is carried out by dual Delaunay triangles and Voronoi polygon...
![Figure 1. Element types used in the numerical model [10].](profile/Manh-Tran-5/publication/348564681/figure/fig4/AS:981250177245185@1610959681169/Element-types-used-in-the-numerical-model-10_Q320.jpg)
A big question in the numerical approaches for the mechanical behavior of the textile-reinforced concrete (TRC) composite under tensile loading is how to model the cracking of the cementitious matrix. This paper presents numerical results of 3-D modeling of TRC composite in which the non-linear behavior model was used by considering the cracking fo...
Consolidation parameters of soft soil play an important role in calculating settlement and soft soil improvement by vertical drainage method (distance, quantity, treatment time). In this study, using oedometer tests, consolidation parameters of some soft soils in the North Central coastal region, Vietnam are clarified. The research results show tha...
This paper presents the identification some principal fracture parameters of concretes by experiment and simulation on notched beam in bending. The comparison between experimental and simulation results allows to determinate the Critical stress intensity factors KIC, fracture energy Gf and characteristic lengths of fracture process zone (FPZ) lch o...
The different reasons causing the instability of slope, one of the causes affecting the stability of slope of the dyke body is the impact of the water level in front of them and the unstable seepage. Especially in the current climate change, the change of water level on the flow system (rivers, streams, …) and sea is greatly affected, which is reas...
This paper presents experimental investigations and a lattice modelling of the water permeability and chloride diffusivity of concrete under compressive stress and then proposes relationships between these two transport properties. Two representative ordinary concretes usually used in structures, subjected to compressive loading and water seepage o...
This paper presents experimental and simulation results of the change in the chloride diffusion coefficient of concrete C40 (f ' c=40 MPa) during axial loading. Test Method for Electrical Indication was used to measure the chloride diffusivity of the concrete sample during the axial loading. A mesoscopic lattice model is proposed to describe the va...
This study aims at deriving the effective poroelastic properties of the oolitic limestones based on the Hashin composite sphere assemblage (CSA) micromechanical theory. The microstructure of oolitic limestones generally exhibits an assemblage of grains (oolites) surrounded by a matrix. Grain and matrix are linked via the interfacial transition zone...
The durability of concrete structures strongly depends on the water and chloride penetration in cracked concrete during its service life. This work aims at modeling the damage effect of tension stiffening behavior on the permeability for concrete tie specimen under tensile load by a dual lattice model, which considers hydromechanical couplings. Thr...
This study considers the fluid flow through a porous formation containing discontinuities (fault, fracture, crack, microcrack), which is usually much more conductive than the surrounding matrix. The discontinuity is mathematically represented by a 1D smooth function of curvilinear abscise and physically characterized by its aperture. Fluid flow is...
This study proposes a mesoscopic thermo-mechanical (TM) lattice model to describe the transient thermal strain (TTS) behaviour of concrete and to predict the attenuation of its TM properties as a function of temperature. In such a model, concrete includes three constituents: cement, aggregates and interfacial transition zones (ITZ). A damage model...
This paper aims at deriving an approximate model of stress-induced permeability enhancement for brittle cracked porous rock, based on the linear fracture mechanic theory. A recently proposed model of the effective permeability of a porous rock containing an anisotropic distribution of several crack families is used. In such a model, the fluid flow...
Hiện tƣợng mất ổn định mái dốc nói chung và thân đê nói riêng là do tác động của nhiều nguyên nhân khác nhau.
Một trong những nguyên nhân gây ảnh hƣởng tới ổn định mái dốc thân đê phải kể đến đó là tác động của dòng thấm,
đặc biệt là dòng thấm không ổn định trong đất không bão hòa. Vấn đề nghiên cứu tác động của dòng thấm không ổn
định đến ổn định...
Nghiên cứu này sử dụng mô hình lưới (lattice model) để mô phỏng sự hình thành và phát triển các vi khe nứt và ảnh hưởng của nó đến hệ số thấm của cấu kiện bê tông tăng cường sợi thép (FRC). Trong mô hình này, bê tông được xem là bão hòa nước và bỏ qua ảnh hưởng của hiện tượng mao dẫn. Luật ứng xử kết hợp cơ-thủy được phát triển dựa trên mô hình cơ...
Nghiên cứu này sử dụng mô hình lưới (lattice model) để mô phỏng sự hình thành và phát triển các vi khe nứt và ảnh hưởng của nó đến hệ số thấm của cấu kiện bê tông tăng cường sợi thép (FRC). Trong mô hình này, bê tông được xem là bão hòa nước và bỏ qua ảnh hưởng của hiện tượng mao dẫn. Luật ứng xử kết hợp cơ-thủy được phát triển dựa trên mô hình cơ...
Nghiên cứu này sử dụng mô hình lưới (lattice model) để mô phỏng sự hình thành và phát triển các vi khe nứt và ảnh hưởng của nó đến hệ số thấm của cấu kiện bê tông tăng cường sợi thép (FRC). Trong mô hình này, bê tông được xem là bão hòa nước và bỏ qua ảnh hưởng của hiện tượng mao dẫn. Luật ứng xử kết hợp cơ-thủy được phát triển dựa trên mô hình cơ...
Ecofriendly, ecoefficient and sustainable civil engineering work has been research with emphasis on
adapting the byproducts of solid waste recycling and reuse to achieving infrastructural activities with low
or zero carbon emission. The direct combustion model, "the solid waste incinerator caustic soda oxides
of carbon entrapment model" (SWI-NaOH-O...
This article presents a lattice-type numerical modelling method for analysing the thermo-mechanical behaviour of concrete subjected to com-pressive stresses at high temperature. The concrete is considered as a two-dimensional mesoscale structure consisting of three material phases: aggregates, cement paste and interfacial transition zones (ITZ). Su...
Concrete structure can be damaged when subjected to high temperatures due to the mismatch of thermal expansions between the material constituents. The damage results in the initiation and growth of cracks, particularly on the interface between constituents, which decreases the effective thermal conductivity. This phenomenon is usually modelled by a...
Concrete structure can be damaged when subjected to high temperatures due to the mismatch of thermal expansions between the material constituents. The damage results in the initiation and growth of cracks, particularly on the interface between constituents, which decreases the effective thermal conductivity. This phenomenon is usually modelled by a...
This work aims to characterize the creep behavior of the major microstructure constituents of cement paste by means of a novel approach which combines Nanoindentation Technique (NT) and Scanning Electron Microscopy with X-ray microanalysis (SEM-EDS). We first performed a large grid of nano-indentation tests on different cement paste samples. The te...
