In this study the effects of cement kiln dust (CKD), a by-product of cement, on the geotechnical properties and erosion control of a natural slope consisting of fine-grained soil in the state of ...
There is a strong relationship between electrical resistance and durability depending on the used concrete age. In addition to this, the temperature has a great effect on the apparent resistivity ...
Depending on various factors (such as pyroprocessing system, raw feed characteristics, fuel type, etc.), the physical, chemical, and mineralogical attributes of cement dust …
Additionally, the dust does not hold too much charge and is adequately cleaned from the collecting plates by normal rapping. If resistivity is in the range 1E12 to 1E14 OHM-CM, it is considered to be high resistivity dust. This dust is tightly held to the collecting plates, because the dust particles do not easily conduct their charge to ground.
This is an indication to the low water resistivity of these samples which is mainly resulted from their poor binding capacity. For other mixtures, the increase in CKD content leads to a remarkable water absorption reduction. ... The fresh cement kiln dust acts as alkali-bearing waste with high efficacy in the interaction with amorphous ...
Cement Kiln Dust (CKD) is a waste material of the cement manufacturing process. CKD is widely used as an additive material in ground improvement to improve soil's geotechnical properties....
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.
The measurement of the electrical resistivity of cement-based materials, e.g., concrete, is used for quality control and durability assessment. In an existing …
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 ...
Dust is the main pollutant from the cement industry. Many links in the cement production process, such as raw material crushing, raw meal grinding, clinker calcination, cement grinding, etc., have different degrees of dust spillover.Among them, the clinker calcination stage has the most serious dust emission degree, accounting for more than 70% of the …
The resistivity of raw material cement dust is so high as 1014ohm·cm at 300oC, that cement dust would not precipitate well by the electrostatic precipitator. Key words: …
Cement dust were collected across all existing cement plants in Nigeria and were examined for their electrical resistivity. Dust collection was done from the hopper of the ESPs of these plants and each cement dust was labeled using the name of the plant from which it was sampled. 46 Odewale et al.; JERR, 15(1): 44-51, 2020; Article no.JERR ...
The electrical resistivity of concrete is increasingly measured as an indicator of its fluid transport properties, for use in quality control or for service lif Electrical Resistivity Measurements in Cementitious Systems: Observations of Factors that Influence the Measurements | NIST
Self Compacting Concrete (SCC) has had a remarkable impact on the concrete construction industry, especially the precast concrete industry. Crushed Rock Dust (CRD) and Marble Sludge Powder (MSP) are discarded in the nearby land and the natural fertility of the soil is spoiled. MSP and CRD can be used as filler and helps to …
The defects and damages of the internal structure of concrete can be deduced according to the resistivity of cement-based materials. Based on the four points Wenner probe and the traditional two-electrode plate ac impedance spectroscopy test method, the embedded four electrodes with the optimized electrode distribution in the cement-based materials are …
the concrete, including the presence of moisture and voids, which is why multiple measurements around the specimen (eight times as per AASHTO TP 95 test method) are required to obtain a reliable average for the inherent resistivity of concrete. What Influences the Measurements? The inherent electrical resistivity of concrete is …
This paper reports the recycling of bagasse ash (waste product of sugar industries) as a cement replacement in concrete, which provides a satisfactory solution to environmental concerns associated with waste management. The impact of …
Cement Kiln Dust (CKD) is a waste material of the cement manufacturing process. CKD is widely used as an additive material in ground improvement to improve soil's geotechnical properties. This study is mainly focused on the effect of CKD on the electrical resistivity …
Modern closed circuit cement mills have separate mill ventilation and fresh feed Is partially cooled by the coarse returns from the separator. This reduces the need for cooling with water injection and results in higher resistivity dust in the gas streams. The trend for recent cement mill installations is that they are dedusted by bag filters.
This paper presents a small tube/wire type electrostatic precipitator (ESP). In the ESPs present form, particle charging and collecting voltages and airflow rates were individually varied throughout 200 ambient temperature test runs ranging from 10 to 30 kV in increments on 5 kV and 0.5 m/s to 1.5 m/s, respectively.
Replace your dust mask if it becomes damp or contaminated. Do not reuse disposable single-use dust masks. Cement Dust Skin Damage. Cement-based products, like concrete or mortar, can cause serious skin problems such as dermatitis and burns. Fine cement and concrete dust can land on exposed skin, and get trapped between …
Cement-based materials usually have resistivity of 6.5·10 5 to 11.4·10 5 Ω·cm 7, so it can be said that they are not even a good conductor such as copper, which has a resistivity of ...
This study presents the electrical resistivity responses of saturated cement pastes undergoing cyclic freeze-thaw (F-T) action. An ordinary cement paste (OPC) and a blended paste (CS) containing ground granulated blast-furnace slag were used for the tests, and both pastes had water to binder ratios of 0.5.
Studies relevant to the resistivity measurements test equipment demonstrated that electrical signals form and electrode contact, the frequency with the …
The experimental measure of dust resistivity consists in applying a difference of potential through a layer of powder of known thickness and measuring the current obtained. The higher the current, the lower is the resistivity and thus the higher is the capability of the dust to conduct electrical charges. ...
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 …
Gas cleaning in the cement industry is an enormous task. The modern process of cement production involves crushing and grinding of carbonaceous and clayey raw materials under dry conditions, thermal processing of finely ground raw meal, i.e. preheating, precalcining and sintering in rotary kiln, cooling of the clinker (sintered …
The Effects of Cement Kiln Dust on the Soil Electrical Resistivity Hamid Ranjkesh Adarmanabadi, Arezou Rasti, Mehrdad Razavi ... time on the electrical resistivity of cement-treated soil were evaluated. This investigation proved that the ... located west of the New Mexico Institute of Mining and Technology (34.080056, 106.917583) in Socorro, NM,
Why Resistivity of Concrete is Important. Determining the electrical resistivity of concrete offers valuable insights into its long-term durability. Concrete resistivity is directly related to its ability to resist the penetration of harmful water-borne chlorides. Water, with various salts in solution, readily penetrates permeable concrete.
To experimentally observe the effect of temperature on the resistivity of concrete–CCF composites, samples were placed in a temperature controlled freezer and their resistivity tested over the range −15 °C–20 °C in 5 °C intervals. At a given temperature setting, samples were allowed to cool until the internal sample temperature, …