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 20 of 21 for “"Diffusion test"”.
-
Evaluation of Chloride Diffusion in Concrete Using Bulk Diffusion Test and Scanning Electron Microscopy
… implemented which involved the preparation and testing of 31 different concrete mixes, each incorporating varying proportions of SCMs and w/cm ratios. Concrete samples were mixed, poured, and cured according to ASTM standards and then subjected to exposure in an extremely aggressive environment …
-
Durability studies of high performance concrete used for bridge decks
… of chloride penetration, chloride ion diffusion test, freeze-thaw/salt scaling test and physical sulfate attack test.;Results and relationships between the results were discussed. Some conclusions were reached and some recommendations were made.
-
Macrolide and lincosamide resistance patterns in invasive and colonizing group B streptococcus isolated in Belgium
… erythromycin and clindamycin were determined by Etest® (EUCAST interpretive criteria) on 275 clinical isolates (N1) obtained from the Belgian surveillance for invasive GBS disease in newborns and adults during 2008 to 2011 and on 53 recto-vaginal colonization in pregnant women (N2) in 2010. …
-
Jatropha curcas oil as a bio-based rejuvenating agent for reclaimed asphalt pavement mixtures
… content was determined through asphalt binder test. A total of 4% JCO by mass of asphalt binder (40% RAP + 60% virgin binder) was incorporated into the binder and mixtures. The effects of JCO on asphalt binder and mixture were investigated via physical properties test, bleeding test, diffusion …
-
A Homegrown DSMC-PIC Model for Electric Propulsion
… has been initially validated through several tests and comparisons to theoretical data and other DSMC models. This thesis examines expanding the functionality of SINATRA to simulate charged particles and make SINATRA a DSMC-PIC hybrid. The electric potential is calculated through a 7-point 3D …
-
Evaluation of surface treatments for RC structures failing to meet South African durability index requirements
… was not possible since modified and custom tests differing from the standard bulk diffusion test were used to evaluate performance. Chloride resistance was improved due to the pure silane however service life improvements could not be quantified. Unexpected failures occurred during the …
-
Development of a new test protocol for the permit Ion migration test
… is to remove cores from the structure and test them in a laboratory to determine the chloride diffusion coefficient using the steady state diffusion test. This test is not popular due to its long test duration to achieve a steady state of flow of chlorides through the test specimen, which …
-
Rapid assessment of the potential chloride resistance of structural concrete
… the three allowed methodologies, the immersion test was carried out. At least two water-cement ratios were produced for each mix design to enable normalisation of the results. The performance of concrete was compared on the basis of equal compressive strength, i.e. 40 and 50 N/mm2 and an equal …
-
Thermal transient computation for a CTR blanket following a major plasma disruption
… velocity model. Neutronic studies including a Diffusion Test Model (DTM), a 23-group cross-section library, and a 37-group neutron and 21-group gamma library from ORNL used in conjunction with the ANISN Code, provided different volumetric heat source rates which were used to do a thermal …
-
Duration of Antibiotic Residues in Milk from Cows Treated via Intrauterine and Intramammary Infusion
… any level of antibiotics. There are new tests that have been developed recently which are simple, quick, and more sensitive. These tests are the Difco disc assay using Bacillus stearothermophilus, the agar diffusion .test which uses Bacillus stearothermophilus var calidolactis, and an …
-
Assessment and prediction of chloride ingress and carbonation in patch repair mortars
… conductivity (Chloride Conductivity Index test) and rate of chloride-ion diffusion (bulk diffusion test), and (ii) gas permeability (Oxygen Permeability Index test) and rate of carbonation (accelerated carbonation test) in patch repair mortars. Eight mortar mixes were used in the …
-
Phase Behaviour and Mass Transfer of Solvent(s)-CO2-Heavy Oil Systems Under Reservoir Conditions
… methods have been performed to determine the diffusion coefficient of each component in the solvent(s)-CO2 mixture or the apparent diffusion coefficient of the mixture in heavy oil. It is found that the gas-phase solvent fraction decreases as diffusion proceeds, while the gas-phase CO2 …
-
An Experimental Study of Carbon Dioxide Dissolution into a Light Crude Oil
… into the light crude oil. First, a series of PVT tests were conducted to measure CO2 solubilities in the light crude oil, oil-swelling factors, and CO2-saturated light crude oil densities at different equilibrium pressures and the actual reservoir temperature of Tres = 56.0°C. Second, the onset …
-
An Experimental Study of CO2 Dissolution into a Heavy Oil Without or With a Porous Medium
… heavy oil was noted. Three different theoretical diffusion models for determining the diffusivity of a solvent in a liquid phase were applied and analyzed. More specifically, first, two series of PVT tests of the Colony heavy oil– CO2/CH4/C3H8 and the McLaren heavy oil–CO2/CH4/C3H8 systems were …
-
Physical performance and durability evaluation of rubberized concrete
… procedure. Then, three types of durability test were conducted namely, 1) Chloride ion diffusion test, 2) Abrasion wear resistance test, and 3) Freezing and thawing test. Up-to-date, many successful achievements were reported by researchers around the world. However, in Asian cases, very …
-
Properties of Western Cape concrete with metakaolin
… analysis, ii) pozzolanic reactivity using three tests; strength activity index test, heat of hydration test (semi-adiabatic and isothermal calorimetry tests), and thermogravimetric analysis (TGA), iii) fresh properties of concrete assessed by setting time and workability, iv) hardened properties …
-
in vitro studie van Candida albicans en Streptococcus mutans biofilms
… amounts of nystatin could be released. A disk diffusion test showed that the antimycotic effect of the silicone was correlated with this release. When C. albicans biofilms were grown on the “admixed” silicone, biofilms with reduced biomass were only found in the static system. In the MRDs and …
-
Enhancing the service life of concrete exposed to chloride attack
… degree of accuracy, four contemporary chloride test methods were used in this work to measure the chloride penetration of concrete, which are: (i) Method A-rapid chloride permeability test to ASTM C1202; (ii) Method B-chloride migration test to NT Build 492; (iii) Method C-Multi-Regime test to …
-
Influencia de las condiciones de curado en el comportamiento del hormigón sometido a ciclos hielo-deshielo
… without. In addition to the freezingthawing test, additional durability tests were performed including: water penetration under pressure, gas permeability, mercury intrusion porosimetry, the differential thermal analysis (ATD), termogravimetric analysis (TG), and chloride diffusion test. …
-
Service life extension of reinforced concrete structures using hydrophobic impregnation
… rate of 400 g/m2 . Several experimental tests were performed on untreated and silane treated concrete. Compressive strength and Durability Index (DI) tests were carried out to characterise the concrete mixes. Accelerated carbonation and moisture profiling tests were undertaken to assess …
Page 1 of 2