Author
Kostas Komnitsas
Other affiliations: National Technical University of Athens
Bio: Kostas Komnitsas is an academic researcher from Technical University of Crete. The author has contributed to research in topics: Tailings & Compressive strength. The author has an hindex of 30, co-authored 90 publications receiving 3437 citations. Previous affiliations of Kostas Komnitsas include National Technical University of Athens.
Topics: Tailings, Compressive strength, Soil water, Geopolymer, Coal mining
Papers published on a yearly basis
Papers
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TL;DR: A review of the most important research findings over the last 25 years is presented in this paper, which elucidates chemistry and reaction mechanisms for most important categories of materials involved, identifies the gaps in the existing body of knowledge and underlines the reasons why this promising technology has not become widely accepted by the industry.
754 citations
TL;DR: In this article, the compressive strength of concrete, bricks and tiles collected from various demolished buildings were mixed with the activating solution (NaOH and Na 2 SiO 3 ), and various synthesis conditions (curing at 60-90°C, 8-14 m NaOH molarity, particle size) were considered.
194 citations
TL;DR: In this article, the feasibility of geopolymer synthesis from low Ca electric arc ferronickel slags was investigated through a 23 factorial design and the experimental results and the variance analysis have shown that only aging period has a statistically very significant and positive effect on the final compressive strength while the effect of other factors as well as of their interactions were either less significant or negligible.
Abstract: The present experimental study investigates the feasibility of geopolymer synthesis from low Ca electric arc ferronickel slags. Additives used include kaolinite, sodium silicate, sodium hydroxide and water. The effect of the main factors considered (heating temperature, heating time and aging period) as well as of their interactions on the final compressive strength of the geopolymers produced was studied through a 23 factorial design. The experimental results and the variance analysis have shown that only aging period has a statistically very significant and positive effect on the final compressive strength while the effect of the other factors as well as of their interactions were either less significant or negligible. Identification of new phases formed in order to elucidate geopolymerisation mechanisms was carried out by XRD and FTIR. Sodalite, maghemite, thermonatrite, trona and calcite are the major phases identified. The structural integrity of the produced geopolymers was studied by subjecting them to accelerated freeze–thaw cycles. Finally, the durability of the produced geopolymers when immersed in various aquatic and acidic solutions was investigated.
176 citations
TL;DR: The potential of inorganic polymer technology as a feasible option for the utilisation of certain potentially hazardous mining and metallurgical wastes towards an increased sustainability of the wider minerals sector is discussed.
172 citations
TL;DR: In this article, the potential of in-situ permeable reactive barriers (PRBs) to remove heavy metal ions from synthetic solutions simulating acidic leachates under dynamic flow conditions was evaluated.
170 citations
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TL;DR: The scale of the problem in terms of population exposed to high As concentrations is greatest in the Bengal Basin with more than 40 million people drinking water containing ‘excessive’ As as mentioned in this paper.
6,741 citations
Journal Article•
TL;DR: A case study explores the background of the digitization project, the practices implemented, and the critiques of the project, which aims to provide access to a plethora of information to EPA employees, scientists, and researchers.
Abstract: The Environmental Protection Agency (EPA) provides access to information on a variety of topics related to the environment and strives to inform citizens of health risks. The EPA also has an extensive library network that consists of 26 libraries throughout the United States, which provide access to a plethora of information to EPA employees, scientists, and researchers. The EPA implemented a reorganization project to digitize their materials so they would be more accessible to a wider range of users, but this plan was drastically accelerated when the EPA was threatened with a budget cut. It chose to close and reduce the hours and services of some of their libraries. As a result, the agency was accused of denying users the “right to know” by making information unavailable, not providing an adequate strategic plan, and discarding vital materials. This case study explores the background of the digitization project, the practices implemented, and the critiques of the project.
2,588 citations
TL;DR: A comprehensive assessment of soil heavy metal pollution derived from mines in China is provided, while identifying policy recommendations for pollution mitigation and environmental management of these mines.
2,061 citations
TL;DR: In this paper, the potential position of and drivers for inorganic polymers (“geopolymers”) as an element of the push for a sustainable concrete industry are discussed.
1,444 citations
TL;DR: In this article, the authors describe acid mine drainage generation and its associated technical issues, and present three basic levels: primary prevention of acid-generating process, secondary control, and tertiary control, or the collection and treatment of effluent.
1,336 citations