Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 19 of 19 for “"concrete fracture"”.
-
Modelling of shear-off failure of concrete : fracture mechanics approach
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1992.
-
Impact of matrix modification on concrete fracture: Insights from mechanical testing and in-situ high speed imaging
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-05-01
-
Fracture Tests for Bituminous-Aggregate Mixtures: Laboratory and Field Investigations
… This study investigates the ability to apply fracture mechanics principles to study asphalt concrete cracking through experimental techniques. Single-edge notched beam (SE(B)) and disk-shaped compact tension (DC(T)) test geometries were developed to estimate the fracture energy of asphalt …
-
Rock fracture under static stress conditions
… an understanding of the mechanics of rock fracture, particularly under compressive stress conditions, is of fundamental importance. This thesis contains details of an investigation into the applicability of Griffith's brittle fracture theory, modified to account for the effects of crack …
-
Asphalt mixture evaluation using performance space diagrams, digital image correlation, and discrete element modeling
… and recycled asphalt materials in asphalt concrete has generated a need for greater laboratory evaluation. Asphalt modifiers, such as styrene butadiene styrene (SBS) polymer, bio-modifiers, and warm mix asphalt processes, and recycled asphalt materials, such as recycled asphalt pavement …
-
Numerical modelling of time-dependent cracking and deformation of reinforced concrete structures
… an important aspect of the design of reinforced concrete structures at the serviceability limit state. Despite its importance, code methods for crack control have been developed, in the main, from laboratory observations of the instantaneous behaviour of reinforced concrete members under load and …
-
Fracture toughness of ultra high performance concrete
In this study, fracture properties of Ultra-High Performance Concrete (UHPC), and High Performance Concrete (HPC) are presented. The average compressive strengths of UHPC and HPC used in the tests were 141 MPa, and 55 MPa respectively. Formulation and processing of the mixes and test specimens are …
-
Properties of functionally graded concrete slabs
… project examined the feasibility of developing a fracture test that was easy to perform in the field. The standard fracture test involves using a three-point beam setup (SEN(B)). The SEN(B) geometry is extremely difficult and time consuming to extract from the field and so a circular specimen, …
-
Fracture characterization of thin bonded asphalt concrete overlay systems
… of waterproofing benefits. Conventional asphalt concrete fracture tests were developed for pavements with homogeneous asphalt concrete mixtures, and typically their thicknesses exceed two inches. The use of spray paver technology for construction of TBO leads to continuously varying asphalt …
-
Creep and fracture of self-consolidating concrete incorporating fly ash
Self-consolidating concrete (SCC) is a relatively new type of concrete that has the ability to flow under its own weight such that it can pass through tightly spaced reinforcement and fill corners of molds without the use of mechanical vibration. Due to the favorable plastic properties of SCC, …
-
Nonlinear finite element analysis of reinforced concrete structures subjected to blast loading
… analysis of planar and axisymmetric reinforced concrete structures subjected to blast loading. The main aspects of numerical modelling process to simulate blast loads, structural geometries and material behaviour are addressed. Major attention has been focused on the development of appropriate …
-
Fractionated reclaimed asphalt pavement as a coarse aggregate replacement in a ternary blended concrete pavement
… application of the coarse fraction of FRAP in concrete. The concrete mix proportions contained 0, 20, 35, and 50% FRAP replacement levels by weight of the coarse aggregate. Two other by-product materials, ground granulated blast furnace slag and fly ash, were utilized as partial replacements …
-
Parallel simulation of particle dynamics with application to micropolar peridynamic lattice modeling of reinforced concrete Structures
… part of the thesis, we will model reinforced concrete structures based on peridynamic theory [Silling 1998]. We discard the continuum mechanics paradigm completely, and model reinforced concrete by introducing the micropolar peridynamic lattice model (MPLM)'. The MPLM models a structure as a …
-
Modelización del deterioro de tableros de puentes de hormigón por difusión de cloruros y corrosión de la armadura pasiva
… bars is a primary cause in the deterioration of concrete structures, which may be led to failure and even collapse. In any case, the cost of associated repair and maintenance is enormous. Hence, investigations relating to the durability assessment of concrete structures have shown a substantial …
-
Víceúrovňové hodnocení křehkosti vybraných stavebních kompozitů
Zadaným tématem diplomové práce je víceúrovňové hodnocení křehkosti stavebních kompozitů. Práce se zabývá posudky lomových parametrů zkušebních těles z lehkého a obyčejného betonu. Zmíněná tělesa se dále odlišovala obsahem vláken v betonových směsích, jejich druhem a délkou. Práce se člení na dvě …
-
A Mesh Objective Algorithm for Modeling Mode-I Cracks Using a Standard Finite Element Formulation
A computationally efficient mesh objective algorithm for modeling mode-I cracks is developed and implemented within a standard finite element formulation. The algorithm applies the crack opening displacements across the standard nodal degrees of freedom that is consistent with formalism of the …
-
Simulation of Fracture of Concrete Using Micropolar Peridynamics
… constitutive damage model for simulating tensile fracture of concrete using the micropolar peridynamics model. Micropolar peridynamics was proposed by Gerstle in 2007 as a generalization to the bond based peridynamics method introduced by Silling in 2000, which was only capable of handling …
-
Development of a phenomenological constitutive model for fracture resistance degradation of asphalt concrete with damage growth due to repeated loading
Discontinuous areas under the asphalt concrete (AC) layer, such as joints and cracks in an underlying layer, induce higher stress concentration than the designed strength. Stress concentration in the vicinity of discontinuities accelerates distress on the AC layer. Repeated traffic and …
-
Effect of specimen geometry and test configuration on the fracture process zone for asphalt materials
… evaluate the cracking vulnerability of asphalt concrete. The test consists of a semi-circular asphalt concrete sample that has a vertical notch loaded along the symmetric axis resulting in mode-I type of fracture similar to, the typical three-point bending beam tests. The I-FIT global response …