As sustainability moves to the forefront of construction, the utilization of high volume fly ash concrete mixtures to reduce CO2 emissions and cement consumption per unit volume of concrete placed is receiving renewed interest. Concrete mixtures in which the fly ash replaces 50 % or more of the portland cement are both economically and technically viable. This paper focuses on a characterizatio...

Cement kiln dust produced in a local cement production plant in Saudi Arabia, along with fly ash resulting from combustion of heavy fuel oil in a local power generation plant were utilized as waste materials blended with ordinary Portland cement at various ratios. These blends were tested for their water requirements for normal consistency, initial setting times, and compression and tensile str...

Germanium recovery from coal fly ash by hydrometallurgical procedures was studied at the pilot scale (5 kg of fly ash/h). Results were used to design the equipment of a demonstration-sized plant (200 kg of fly ash/h). The process is based on hydrometallurgical operations: firstly a germanium extraction from fly ash by leaching and a consequent Ge separation from the other elements present in th...

High volume fly ash (HVFA) concretes are one component of creating a more sustainable infrastructure. By replacing 50 % or more of the Portland cement with fly ash, a significant reduction is achieved in the carbon footprint of the in place concrete. While HVFA mixtures can be proportioned to produce equivalent long term performance as conventional (cement-only) mixtures, performance problems a...

0958-9465/$ see front matter Published by Elsevier doi:10.1016/j.cemconcomp.2011.04.008 ⇑ Corresponding author. E-mail addresses: [email protected] (D.P. Bentz), (A.S. Hansen). In the drive to produce more sustainable concretes, considerable emphasis has been placed on replacing cement in concrete mixtures with more sustainable materials, both from a raw materials cost and a CO2 footprint per...

s c a l h r e t s s “Thousands of tired, nerve-shaken, over-civilized people,” wrote conservationist John Muir over a century ago, “are beginning to fınd out that going o the mountains is going home; that wilderness is a ecessity; and that mountain parks and reservations are seful not only as fountains of timber and irrigating rivrs, but as fountains of life.” Muir was not breaking new round. S...

--Tree crew supervisors in 48 California cities were asked what problems they encounter with the five most common trees along their streets. The top five trees of the 20 most often named were sweetgum, Modesto ash, southern magnolia, planetree, and Chinese or lacebark elm. Major problems reported included root damage to sidewalks and curbs, growth of suckers from the root crown, exceptionally f...

A predictive model for detection of Agrilus planipennis (Col., Buprestidae) larvae in girdled ash (Fraxinus spp.)A predictive model for detection of Agrilus planipennis (Col., Buprestidae) larvae in girdled ash (Fraxinus spp.)" (2010). USDA Forest Service / UNL Faculty Publications. Paper 153. A predictive model for detection of Agrilus planipennis (Col., Buprestidae) larvae in girdled ash (Fra...

The emerald ash borer (EAB) is an exotic insect pest currently threatening ash species in the Great Lakes region. Because of the potential impact on forests in this area, multiple government agencies are currently focusing their efforts on developing new technologies to detect, monitor and control this insect pest. Previous work has shown that hyperspectral remote sensing technologies can produ...

The harsh climate of the arid zone determines several biological features in black saxaul plantations. Therefore, study growth and condition artificial plantations, depending on use physiologically active moisture-absorbing substances biostimulants, is particular practical importance. In Moinkum sands Zhambyl region (Kazakhstan), observations development places where biostimulants were used con...