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 13 of 13 for “"Plastic viscosity"”.
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Low-Shrinkage Fiber-Reinforced Concrete for Infrastructure Construction and Rehabilitation
… 3D + 20% short steel fibers; STST), SMMs, and plastic viscosity on bond strength and structural properties of beams was evaluated. Test results indicated that optimal SRA-MSF system led to low drying shrinkage without mitigating mechanical properties of FR-SWC. Using 1.25% SRA improved …
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INVESTIGATION ON RHEOLOGY OF CEMENT PASTE AND CONCRETE AT HIGH TEMPERATURE
… of portland cement paste incorporating superplasticizers were also investigated. Results suggested that polycarboxylate-based superplasticizers should be used at a dosage close to the saturation in order to ensure adequate rheological behaviour at high temperature and prolonged mixing time, …
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INVESTIGATION ON RHEOLOGY OF CEMENT PASTE AND CONCRETE AT HIGH TEMPERATURE
… of portland cement paste incorporating superplasticizers were also investigated. Results suggested that polycarboxylate-based superplasticizers should be used at a dosage close to the saturation in order to ensure adequate rheological behaviour at high temperature and prolonged mixing time, …
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Development of foamed concrete : enabling and supporting design
… rheological parameters, the yield stress and the plastic viscosity, since the rheological properties affect the hardened state. Using flowability as a guide, the relationships are examined between yield stress and viscosity, specifically with reference to their effect on density and w/c ratio. …
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Low oil-water ratio invert emulsion mud for unconventional shale reservoirs
… stability values of 353 and 258V hence, giving plastic viscosity of 36 cP, at the yield point of 17 Ib/100 ft2 and 30 minutes fluid loss of 6ml with filter cake of 1.7 mm. This resulted to 50% reduction in fluid loss over the conventional 70/30 oil-water ratio mud, which was emulsified with the …
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Transient multiphase flow simulation for unloading of frac hit gas wells
… in the study.</p><p>Results show that as the plastic viscosity increases, the nitrogen volume and time to unload will be increased. As tubing depth increases, the nitrogen volume and time to unload the liquid will be increased. However, deepening the tubing has the impact of sweeping more …
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Design and performance of cost-effective ultra-high performance concrete for prefabricated elements
… (b) at steel fiber content of 2%, the optimal plastic viscosity of the suspending mortar was 53 ± 3 Pa·s to secure favorable fiber distribution and enhance flexural properties of the UHPC; (c) through use of hybrid steel fibers, the flexural strength, tensile strength, and autogenous shrinkage …
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STRATEGIES TO IMPROVE SHRINKAGE RESISTANCE OF CEMENT-BASED MATERIALS FOR EXTRUSION-BASED 3D PRINTING
… the influence of water-to-cement ratio, superplasticizer dosage, and welan gum content on mortar printability; iii) propose a “printability window” where rheological properties and desorptivity can secure successful printing; iv) investigate effect of shrinkage mitigation materials (expansive …
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Concrete Rheology
… type, fly ash content and the addition of a superplasticizer on the rheological parameters of yield stress, plastic viscosity, and apparent viscosity. The objective of this work was not only to measure the effects on rheology by the variables, but also to predict some of the same measured …
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The productive reuse of coal, biomass and co-fired fly ash
… showing that their exothermic reactivity, plastic viscosity and yield stress are significantly influenced by the activator solution chemistry and other characteristics of the ash. Two co-fired fly ashes were successfully polymerized, with compressive strengths generally highest for ashes …
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Physical chemistry of microbially-reduced smectites
… existed between $\sigma\sb{\rm e}$ and the plastic viscosity ($\eta\sb{\rm pl}$) for the Fe-bearing smectite suspensions. Multi nuclear ($\sp{29}$Si, $\sp{27}$Al, and $\sp{23}$Na) magic-angle sample spinning nuclear magnetic resonance (MAS NMR) of dithionite- and microbially-reduced …
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Understanding variability in performance of type il cements: insights from Raman imaging
… between 16 to 59 Pa (mean: 34 ± 9.8 Pa) and the plastic viscosity of the stiffest cement being 0.61 Pa.s while that of the most compliant one was 0.12 Pa.s. Open porosity at 28 days ranged between 24% to 32% (mean: 28 ± 2.3%), and strong relationships were observed between porosity reduction and …
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Rheology of grout for preplaced aggregate concrete. Investigation on the effect of different materials on the rheology of Portland cement based grouts and their role in the production of preplaced aggregate concrete.
… mineral additives had first employed, then superplasticizer (SP) was added at 2% and 1%, and finally a combination of 1% SP and pulverized fuel ash (Pfa) at 20% of the cement weight was employed for all mixes. Grout tests have included two point workability tests by the Viskomat NT, flow time …