fly ash Articles
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Case study - Point Mugu Naval Airstrip
The runway is located at the Point Mugu Naval Air Station in Southern California. Economy, durability, low shrinkage and high strength were accomplished by reducing the amount of portland cement used in the concrete while utilizing large volumes of fly ash. In addition to field performance, this approach provided the added environmental goal of reducing the CO2 released into the air through ...
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An immobilisation mechanism for lead in fly ash subjected to mechanochemical treatment
Mechanochemical (MC) processes immobilise heavy metals in fly ash, a desirable outcome because recycled fly ash is commonly used in the synthesis of inorganic materials. We investigate the extent of immobilisation and the mechanism of lead (Pb) leaching during MC treatment of fly ash, using lead oxide (PbO) and lead dichloride (PbCl2) as model compounds. MC treatment of the fly ash inhibited Pb ...
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Utilisation of pulverised coal fly-ash as filler and rice straw as fibrous raw material for manufacturing of special grade paper
This innovative research study is based on utilisation of two solid waste materials, pulverised coal fly-ash and rice straw for manufacturing of laminate base paper. Fly-ash can prove to be a very good filler for laminate grade coloured base papers and other specialty papers where very high opacity is sought but whiteness is not important. The paper samples with 22% filler have opacity of 99.6% ...
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Case study - Fly ash for California’s Olivenhain dam
The Olivenhain Dam will be the first roller compacted concrete (RCC) gravity dam in California and the tallest in North America. At 308 feet tall and 2,552 feet long, the dam used almost 1.5 million cubic yards of RCC and over 152,000 tons of fly ash. As the centerpiece of the San Diego County Water Authority (SDCWA) Emergency Storage Project, the dam is designed to survive a major earthquake and ...
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Online flow measurement of fly ash to control process conditions - Case Study
Customer: Cement plant Material: Fly ash Installation: After hopper and screw feeder Function: Online information about the quality of flow condition APPLICATION Fly ash does have the tendency to create blockages in the cone of the hopper and screw feeder. Our customer was looking for a solution to provide information about the quantity of material flow behind the hopper to control the flow ...
By ENVEA
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Case study - High volume fly ash for the 2 Folsom project
High Volume Fly Ash (HVFA) concrete was successfully used as the cornerstone of this project’s sustainability program. HVFA concrete was aggressively pursued because of its environmental benefits. When fly ash is used in place of cement, energy and landfill space is conserved and greenhouse gas emissions are reduced. During this HVFA project, roughly 2,800 tons of CO2 emissions were ...
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Case study - High volume fly ash for Texas parks building
Before construction began on the new park headquarters building at Lake Somerville State Park, the Texas Parks & Wildlife Administration decided it had a great opportunity to get involved with sustainable building practices. Using High Volume Fly Ash (HVFA) in concrete structures at the site was one of the main sustainable building components used in the project. Although it was a relatively ...
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Pyrolysis of low-density polyethylene using synthetic catalysts produced from fly ash
Catalytic pyrolysis of low-density polyethylene (LDPE) was investigated using various fly ash-derived silica–alumina catalysts (FSAs). FSAs were prepared by a simple activation method that basically includes NaOH treatment of fly ash by a fusion method, followed by an aging process. A series of LDPE pyrolysis experiments was conducted and the catalytic performance of FSAs was assessed in terms of ...
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Case study - High volume fly ash concrete for Colorado`s ocean journey aquarium
From the visually breathtaking use of shotcrete to create the architectural features of rocks and trees in the Ocean Journey complex, to the 8,500 cubic yards of high performance concrete for the salt-water tanks and the structure in general – all benefited from the use of Headwaters Resources fly ash. S.A. Miro Engineering sought a high performance concrete with the following features: ...
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Laboratory investigation of hydraulic characteristics of fly ash as a fill material from the aspects of pollutant transport
Depending on the usage of fly ash, it is necessary to determine its environmental parameters, such as the potential for pollutant transport/leaching after its built-in. This study presents a methodology for determination of transport parameters (filtration coefficient, effective porosity, longitudinal dispersivity, and the mean residence time) from experimental data collected from column ...
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Modified Testing Device to Evaluate MR Properties on Fly Ash Treated Subgrade Soil
The need to obtain reliable resilient modulus (MR) for fly ash treated subgrade soil in pavement thickness design in Taiwan prompted the modification of the existing standard testing device. In the modified device, a load cell and two linear variable differential transformers (LVDTs), conforming to TAI and AASHTO methods, were used to measure the axial load and deformation of specimen. To control ...
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Durability evaluations of bridge deck high–performance concrete
Although several information are available on various aspects of durability of high–performance concrete (HPC), no systematic information is available on durability of HPC used for bridge decks. In this study, 12 HPC mixtures were prepared with different combinations of fly ash, slag, and silica fume with three different w/cm ratios: 0.40, 0.35, 0.30 to study the durability primarily ...
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Case study - High volume fly ash in the Madera project
Located on a fully wooded 44-acre site in Gainesville, Florida, directly adjacent to the University of Florida campus, Madera consists of 80 lots being developed by Green Trust, LLC, and built by three builders. In the spring of 2002, selected builders were invited to participate in a presentation and meeting with the Florida Energy Extension Service (FEES) which spearheaded the project for the ...
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Innovative Uses for Incinerator Fly Ash
Making concrete construction bricks from incinerator fly ash has just become viable. The Environment Agency have announced that this new innovative end-use for incinerator fly ash meets the ‘end-of-waste criteria’. Castle Environmental and sister company Castle Construction Products are now investing in additional facilities to increase production and product range. Although there ...
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Composition, morphology, properties of coal fly ash microspheres and their application for conditioning liquid radioactive waste
Using methods of the Mossbauer spectroscopy, scanning electron microscopy, and thermodynamic analysis of phase formation in silicate multi-component melts, the detailed study of composition, morphology, and properties of fly ash microspheres resulting from combustion of three coals (Irsha-Borodinskii, Kuznetskii and Ekibastuzskii) was carried out. About 60 microspherical products with an iron ...
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Photosynthetic pigment concentrations, gas exchange and vegetative growth for selected monocots and dicots treated with two contrasting coal fly ashes
There is uncertainty as to the rates of coal fly ash needed for optimum physiological processes and growth. In the current study we tested the hypothesis that photosynthetic pigments concentrations and CO2 assimilation (A) are more sensitive than dry weights in plants grown on media amended with coal fly ash. We applied the Terrestrial Plant Growth Test (Guideline 208) protocols of the ...
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How much of the fly ash dryer
Fly how much of a dryer? Price ash dryer is based on the user's needs may be, there is no uniform price, because each user needs equipment and supporting systems are not the same, different materials need to be addressed, for the dryer needs are different manufacturing the selection also different, especially for large particle abrasion equipment big points, strong all choose the best materials, ...
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Improved understanding of the pozzolanic behaviour of MSWI fly ash with Ca(OH)
2solutionThe study aims at investigating pozzolanic behaviour of MSWI fly ash in a saturated Ca(OH)2 solution at various times. The raw and water–washed fly ashes were selected for the pozzolanic solidification experiment to which mass ratios of the solution to ash (ml/g) were adjusted to be 3 and 10, whereas the solidification times were set from 7 to 28 days and from one to three months. From the XRD ...
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Evaluating the concentrations of partitioned heavy metals in fly ash from a medium-sized (32 MW) municipal district heating plant with respect to the new Finnish limit values
The total heavy metal concentrations in the fly ash were clearly lower than the Finnish limit values for forestry fertilisers, and for material used as an earth construction agent, which came into force in March 2007 and in June 2006, respectively. The relatively low heavy metal concentrations, the alkaline pH (12.5) and the elevated Ca concentration (139.5 g kg−1; d.w.) indicate that the fly ash ...
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Newbuild Power Station in Karlsruhe - Case Study
EnBW is one of the biggest German energy suppliers. A major new build bituminous coal fired power plant construction project is the new boiler number 8 of the Rheinhafen Dampfkraftwerk (RDK) in Karlsruhe. The new boiler will have a capacity of 912 MWel with a heating capacity of 220 MWth. The unit will be erected beside the existing units RDK4s and RDK7 and have a net efficiency of > 46% ...
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