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.
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Showing 1 to 16 of 16 for “"interfacial transition zone"”.
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Interfacial transition zone composition and bonding in cementitious materials with asphalt-coated particles
… were carried out by principally studying the interfacial transition zone (ITZ) and the interfacial bond energies between asphalt (RAP) and cement paste. Studies of the ITZ were performed using Euclidean distance mapping and image analysis of compositional backscatter electron micrographs of …
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Applications of Geopolymer in Civil Engineering: Feasibility Study of Loess Stabilization and Waste Concrete Recycling
… analysis on recycled concrete shows that the new interfacial transition zone (NITZ) plays a detrimental role to the performance of recycled aggregate concrete (RAC), and could even contribute more to the mechanical failure of RAC at the microscale than the old interfacial transition zone (OITZ). …
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Micromechanical modeling of concrete at early age
… is generalized to account for the effect of the interfacial transition zone properties on concrete creep. An effective computational platform was developed to evaluate operator expressions in order to obtain relaxation and creep functions numerically. Through numerical examples, it is shown that …
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A study of the influence of aggregate grading on concrete penetrability
… include tortuosity and the porosity of the interfacial transition zone. This research aimed to determine the extent of the influence that aggregate grading has on concrete durability independently of particle packing density and to determine whether fineness modulus (FM) is a suitable and …
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The development of a geopolymer binder from the interbasaltic laterites of Northern Ireland
… model showing presenting new information on the interfacial transition zone between relic metakaolin particles and the geopolymer matrix.<br/>
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Modification of crumb rubber cement interface and its effect on strength and viscoelastic properties
… use of crumb rubber concrete are related to the interfacial transition zone between rubber and paste. Due to mismatches in free surface energy, coefficient of thermal expansion, and elastic modulus between rubber and cement paste, it has been observed that an interfacial gap is present; …
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Analysis of the Physiochemical Interactions of Recycled Materials in Concrete
… is attributed mainly to a larger, more porous interfacial transition zone (ITZ) and to the cohesive failure of the asphalt. It is hypothesized that the detrimental impact on the ITZ is attributable to organic compounds leached from the asphalt in the high pH pore solution. This study proves the …
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Performance Enhancement of Concrete Produced with Treated Demolition Waste Aggregates
… concrete is attributed to the strengthened interfacial transition zone, better overall interlocking of the treated recycled aggregate with the new cement paste, filled-up pores and micro-cracks, reduced porosity, and compacted dense microstructure. The application of the proposed innovative …
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Thermal Conductivity of Fiber-Reinforced Lightweight Cement Composites
… ETC are discussed, including the presence of an interfacial transition zone around the inclusions and the relative size of the different constituent phases. The model developed in this report is not only able to predict the effective thermal conductivity for a material, but it can also be used to …
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Heat transfer through anaerobic digester concrete tank walls
… The study also looked at the influence of the interfacial transition zone around the aggregate and this was found to be not significant and generally can be ignored as a contributor to the thermal conductivity of normal / structural concrete. The effects of the porosity of the binder paste does …
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Concrete microstructure homogenization technique with application to model concrete serviceability
… as cement and aggregate particles connected by interfacial transition zone (ITZ). Defined on a representative volume element (RVE), the relationship between microstructure and macro properties is established. The proposed model is validated by experimental results and then applied in the study …
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The microstructure of synthetic aggregate produced from waste materials and its influence on the properties of concrete
… aggregate affects the microstructure of the interfacial transition zone (ITZ) between coarse aggregate and cement paste matrix. The results confirm the benefit of absorbing water from the surrounding paste by the porous aggregate on the ITZ microstructure unless too much and/or too rapid …
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Durability of Cementitious Materials in Arctic Regions: Investigating Freeze-Thaw Damage and Chloride Ingress Diffusion Mechanisms
… and water-to-cement (w/c) ratios on the overlay transition zone (OTZ), the weakest region of repair-substrate concrete analogous to the interfacial transition zone between aggregates and paste in concrete microstructure. Mechanical properties, fracture characteristics, ion diffusion, water …
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Effect of Surface Moisture Condition on Substrate-Repair Concrete Overlay Transition Zone
… of substrate moisture condition on the overlay transition zone (OTZ) of the substrate-repair concrete. The substrate moisture condition can significantly impact the microstructure characterization of the OTZ. If the substrate is too dry, then it may absorb water from the repair material, …
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Valorisation of wind turbine blades into concrete : a contribution towards a more sustainable approach
… DWTB-GFRP aggregate and lack of bonding in the interfacial transition zone. The addition of DWTB-GFRP as powder resulted in a significant strength decrease at 28 days (due to the retardant properties of wood and the pozzolanic reaction occurring at the later ages), followed by the increase in …