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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 20 of 26 for “"Air Content"”.
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Comparison and Analysis of the Strength, Stiffness, and Damping Characteristics of Concrete with Rubber, Latex, and Carbonate Additives
… effects on strength, stiffness, damping, and air content. The additives included rubber particles from recycled tires, calcium carbonate particles, styrene butadiene rubber (SBR) latex, and a commercially available product named ConcreDamp which contains vegetable gum suspended in styrene …
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Admixture compatibility and freeze-thaw resistance of concrete prepared using commercially produced limestone calcined clay cements
… available high range water reducers (HRWRs) and air entraining agents (AEAs) by studying the impact on flow diameters and initial setting time of mortars. Polyethylene-based HRWR was the least suited, whereas vinsol-based AEA was the most suited for use with LC3 cements. The high fineness of LC3 …
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Freeze-Thaw Resistance and Microstructural Characteristics of Concretes Containing Pozzolans
… a study undertaken to determine the effect of air entrainment on workability and air content of fresh concrete incorporating silica fume (SF), metakaolin (MK), fly ash (FA) and blends of FA and MK and to assess the effects of such pozzolans on freeze-thaw durability, air void system and …
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Development of a theory of particle mixtures and its application to aggregates, mortars and concretes
… demand, cohesion and per cent fines, cement content and plastic density. Derived relationships are examined including those between water demand and cement content The original concept proposed by the author in 1983 has been confirmed in principle and modified in detail on the basis of the …
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Development of High performance Concrete Composites Using Class F Fly Ash and PCC Bottom Ash, and a Statistical Model to Predict Compressive Strength of Similar Concrete Composites
… in water with a slump of 4±½” (102mm ± 13mm) and air content between 4 and 6 percent. In order to achieve the targeted air content, an air entraining agent DARAVAIR 1400 was used. The water-cement ratio of 0.3 was maintained throughout the research and to achieve the targeted slump, high-range …
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Physical performance and durability evaluation of rubberized concrete
… and durability test. Along these three stages, air content was carefully studied and controlled. In Chapter 4, experimental work and discussion on chloride ion diffusion in rubberized concrete tested by migration test and by immersion in salt water was described. Effective diffusion coefficient, …
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Evaluating CEN/TS 12390-9 To Assess Concrete for UK Freeze-Thaw Exposure Conditions
… and CEM II/A-L (limestone) cements, both non-air and air entrained, with different target strengths (20-60 MPa for non-air entrained and 20-50 MPa for air entrained) and a target air content of 4.5%, in accordance with BS 8500. BS EN 197-1 outlines the maximum addition contents that can be …
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Gas loss and durability of EVA foams used in running shoes
… cellular structure and not to a change in the air content. Midsole deterioration in running shoes was measured in controlled running tests.These confirmed the deterioration of the midsole foam, with an increase of the peakplantar pressure and structural damage in the foam after a long run.The …
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Improved packing strategy for distribution centers to reduce freight cost
… packing such that the annual total wasted air content inside the shipment is minimized. Second, I proposed an Carton Selection algorithm, which can determine the best carton, from the carton options chosen by the Carton Combination method, for an incoming or- der with known dimensions. The …
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AI-powered Data Mining for the Development of Sustainable Concrete Materials
… strength, and time-invariant slump and air content properties, respectively. The explainable surrogate property models are applied in mix design optimization under a variety of realistic scenarios considering different engineering design requirements and SCM costs and densities. The …
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Microstructural and fluid transport properties of potatoes during frying
… Total porosity, pore size distribution, oil content and air content of potato discs were calculated from resulting 3D data sets. Oil and air content measured by analysis of micro-CT images followed trends similar to Soxtec and Pycnometer methods, respectively. Image analysis showed a …
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Microstructure characterization of foamed cement and concrete
… is a major durability issue in cold climates. Air-entraining admixtures are used to create a network of fine bubbles that enhance frost resistance. Experience has shown that fresh air content alone cannot predict the effectiveness of the entrained air system. Instead, parameters such as bubble …
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Fractionated reclaimed asphalt pavement as a coarse aggregate replacement in a ternary blended concrete pavement
… partial replacements for cement. A cementitious content of 630 lb/yd3 was used, which consisted of 65% Type I Portland cement, 25% Grade 100 slag, and 10% Class C fly ash. Past research efforts have primarily studied the effects of RAP on the hardened properties in concrete, but there have been …
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EFFECT OF CRACK-REDUCING TECHNOLOGIES AND SUPPLEMENTARY CEMENTITIOUS MATERIALS ON SETTLEMENT CRACKING OF PLASTIC CONCRETE AND DURABILITY PERFORMANCE OF HARDENED CONCRETE
… NQ 2621-900 Annex B, and characteristics of the air-void system, obtained following ASTM C457. The research also examined the correlation between air-void characteristics, compressive strength, freeze-thaw durability, and scaling resistance for the mixtures. All mixtures experienced increased …
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The effect of high volumes of ungraded fly ash on the properties of foamed concrete
… slurry thus entrapping numerous small bubbles of air in the cement paste or mortar. The density of foamed concrete is a function of the volume of foam added to the slurry and the strength decreases with decreasing density. In this study the effect on the properties of foamed concrete, of replacing …
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A study of residual charge of condenser
… previous history, charging potential, moisture content, air content, charge time, discharge time, recovery time, and temperature. It is the purpose of this paper to present results of experiment and to state conclusions drawn from work on temperature effects on residual charge of a paraffin …
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Development and Testing of a Capacitor Probe to Detect Deterioration in Portland Cement Concrete
… the electromagnetic waves) having two different air contents, two void thicknesses, and two void depths (from the specimen's surface). Two specimens were cast for each parameter and their results were averaged. The dielectric properties over curing time were measured for all specimens, using the …
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Beneficial Reuse of Corrugated Paperboard in Civil Engineering Applications
… were tested for flow consistency, unit weight, air content, and compressive strength. CLSM mixtures prepared with corrugated paperboard showed an increased water demand due to high absorption of the corrugate. The higher water content was a significant factor contributing to decreased unit …
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Utilising Waste Paint and Waste Glass in Concrete
… replacement for conventional water-reducing and air-entraining admixtures and a partial replacement for mixing water, and crushed waste glass as a partial replacement for natural coarse and fine aggregates. An in-depth study on the effects of waste latex paint on the fundamental concrete …
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Assessment of Commercial Corrosion Inhibiting Admixtures for Reinforced Concrete
… Concrete properties under test included air content, slump, heat of hydration, compressive strength, and electrical indication of chloride permeability. Monitoring of concrete prism specimens included macro-cell corrosion current, mixed-cell corrosion activity as indicated by linear …
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