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The resistivity of fly ash is dependent on the characteristics of the ash layer and the flue gas. The change in gas temperature has an effect on dust resistivity. Figure 3 shows that the offline dust resistivity increases and then decreases when increasing the temperature with a peak around 130–160 °C. The resistivity of fly ash is connected ...
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Cement pastes and mortars were prepared by replacing ordinary Portland cement with different dosages of biomass fly ashes (0, 10, 20 and 30% BFA) whilst in dry condition. The effect of BFA on the flow behaviour (spread on table and rheology), setting time, temperature of hydration and electrical resistivity was studied in this experimental ...
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The electrical resistivity of sinter dusts generated from the steel industry and coal fly ash from the coal power plant has been investigated using the high voltage conductivity cell based on JIS B 9915 as a function of temperature and water content. Dust characterization such as the chemical composition, size distribution, atomic …
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The measurement of thermal resistivity of soil and backfill materials to include concrete, engineered backfills, grout, rock, sand, and any other material used to encase the cable system installed in the ground is covered in this guide. A thorough knowledge of the thermal properties of a soil or backfill material enables the user to …
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high resistivity dust layers in the corona, by showing the close agreement of the calculated value of the back corona onset point with the measured value of the spark breakdown voltage of the same dust layer between parallel plate electrodes. Re-sistivity-temperature characteristics for many fly ash and cement kiln dusts were also investigated.
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The resistivity of the dust determines the leakage of charge from the dust layer, and will depend on the bulk and sur-face conductance of the dust particles, and also on the properties and number of contacts between particles as they settle onto the electrodes. Normally, the resistivity of dusts that can be trapped in EF ranges from 102 to 1012 ...
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The measurement of thermal resistivity of soil and backfill materials to include concrete, engineered backfills, grout, rock, sand, and any other material used to encase the cable system installed in the ground is covered in this guide. A thorough knowledge of the thermal properties of a soil or backfill material enables the user to properly design, rate, and load …
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The graph to the right shows the effects of moisture upon a gas stream containing cement dust. Normal dust resistivity ranges between 107 ohm-cm and 1010 ohm-cm. Precipitators whose gas streams exhibit high dust resistivity can improve their collection efficiency by adjusting temperature or introducing additional water through evaporation …
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Cement kiln dust, a waste material in the cement industry, contains partially processed raw materials. This paper reports an investigatJon into its usage in concrete as a partial replacement for cement The percentages of cement replacement by weight were 0, 25, 50, 75 and 100 in cement paste and 0, 15, 25, 35 and 45 in both 1:1 5:3 and 1:2:4 concretes.
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2) The resistivity of a cement dust stream is 1012ohmcm at 100∘C and it descends to 109 at 150∘C. Calculate the electron activation energy of cement dust. 3)What will be the effective migration velocity of the plate in question 4 (a 1.0 m2 plate for a gas stream flowing at 6.4 m3/s ) if the operationally measured collection efficiency is 70%.
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It is found that the electrical resistivity increased with the increase in Aw. Komine (1997) proposed a model for the electrical resistivity of the soil–cement admixture and which consists of three parts: electrical resistivity of soil, electrical resistivity of cement and electrical resistivity of pore water.
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Electrical Resistivity of Concrete Concepts, applications, and measurement techniques by Hamed Layssi, Pouria Ghods, Aali R. Alizadeh, and Mustafa Salehi T he so-called rapid chloride permeability (RCP) test is a widely accepted approach for assessing the durability of …
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BOFs employed in this procedure produce BOF dust, BOF slag, and sludge, including iron units. During the oxygen blow, impurities in the metal (silicon, carbon, phosphorus, and manganese) and some iron are oxidized to create the bulk of the steel slag. ... In the air-dry state, concrete resistivity is approximately 50% more than in the …
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The electrical resistivity of concrete decreases both due to the presence of moisture and chloride ions. Saleem et al. [18] have indicated a significant decrease in the electrical resistivity of concrete due to the incorporation of moisture, chloride, and chloride plus sulfate ions.
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Keywords: Cement Kiln Dust (CKD), Electrical Resistivity, Soil pH, Soil Corrosion, Soil Stabilization Introduction Soil electrical resistivity measurements determine how much the soil's resistance is in the flow of electricity. The soil resistivity patterns in different depths provide the subsurface heterogeneities and geotechnical
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This paper aims at analyzing the state-of-the-art techniques to measure electrical impedance (and, consequently, electrical resistivity) of mortar/concrete elements. Despite the validity of the concept being widely proven in the literature, a clear standard for this measurement is still missing. Different methods are described and discussed, …
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Electrical resistivity is one of the important particle–based factors influencing the performance of an Electrostatic Precipitator (ESP), a particulate control device commonly employed in most cement industries in Nigeria. Therefore, this study investigated the electrical resistivity of Cement Kiln Dust (CKD) across nine locally …
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