Hoffman, United States
Hoffman, United States

Time filter

Source Type

Jagupilla S.C.,Stevens Institute of Technology | Grubb D.G.,CETCO | Wazne M.,Stevens Institute of Technology
Geotechnical Special Publication | Year: 2012

Batch kinetics and column studies were conducted using freshly crushed steel slag fines (SSF) media to immobilize Se(IV) and Se(VI). The SSF media was characterized as USCS SP type soil with <5% passing the No. 200 (0.075 mm) sieve. Despite its granular nature, the mineralogy and residual lime content of the SSF media make it quite reactive. Accordingly, batch (immobilization) rates of Se by the SSF media were evaluated using aqueous Se(IV) and Se(VI) salt solutions having target doses equivalent to 10,000 mg/kg (500 mg/L equivalent). The percent removal of Se(VI) and Se(VI) by SSF was about 94% and 6%, respectively after 18 hrs mixing time. Column studies were also conducted to evaluate the selenium removal at lower influent concentrations (30 to 40 mg/L), but typically in excess of dissolved Se concentrations observed in the Western US groundwaters and acid mine drainage leachates. © 2012 American Society of Civil Engineers.


Fox P.J.,University of California at San Diego | Thielmann S.S.,University of California at San Diego | Stern A.N.,Geosyntec Consultants | Athanassopoulos C.,CETCO
Journal of Geotechnical and Geoenvironmental Engineering | Year: 2014

An experimental program of large-scale direct shear tests has indicated that shear displacement of a high-density polyethylene (HDPE) geomembrane (GM) over a gravelly compacted clay liner (CCL) under moderate to high normal stress conditions can cause much greater damage to the geomembrane than static pressure alone. Essentially, no damage was observed at low normal stress. The greatest geomembrane damage occurred at high normal stress (1,658 kPa) and yielded an average of 169 holes/m2, with a maximum hole size of 23 Size, angularity, and hardness of the gravel particles are also important factors with regard to potential damage. Geomembrane damage was greatly reduced when a needle-punched geosynthetic clay liner (GCL) was placed between the geomembrane and gravelly CCL, including one test conducted at very high normal stress (4,145 kPa). The findings suggest that gravelly soils should be viewed with caution for the construction of GM/CCL composite liners for landfill bottom liner systems and other moderate- to high-stress applications. If there is a reasonable expectation for GM/CCL interface shear displacement, project-specific direct shear tests should be conducted to determine the potential for shear-induced geomembrane damage. Recommendations are provided for the performance of such tests and for design options when damage mitigation is necessary. © 2014 American Society of Civil Engineers.


Fox P.J.,University of California at San Diego | Athanassopoulos C.,CETCO
Geosynthetics | Year: 2013

The final segment of our three-part series on geosynthetic clay liner (GCL) shear strength is devoted to dynamic strength, the strength measured for rapid loading conditions. Static shear strengths have been reported for a wide variety of GCLs and GCL interfaces. A research program has been completed on dynamic internal and interface shear strengths for needle-punched (NP) GCLs and textured geomembranes, as these are common liner materials, particularly in North and South America. The shearing surfaces prevent specimens from slipping and thereby avoid associated progressive failure effects. Monotonic tests consisted of a single shear thrust at a specified displacement rate. Cyclic shear tests consisted of back-and-forth shear motion at a specified frequency and displacement amplitude. Published strength data are suitable only for preliminary design purposes. Final design strengths must always be measured using project-specific tests.


Smith M.E.,RRD International Corporation | Athanassopoulos C.,CETCO
Geosynthetics | Year: 2013

Waste rock dumps and tailings impoundments are common features at mine sites. Many of these waste disposal facilities contain sulfide-rich minerals that generate acid mine drainage (AMD) when they ox idize in the presence of ox y gen and water. Control of AMD is achiev ed by remov ing one or more of the three essential components in the acid-generating process: sulfides, air, or water. A n AMD prev ention measure with a good history is to properly cap the waste and thereby minimize the infiltration of water and diffusion of air into the sy stem.


Athanassopoulos C.,CETCO | Fox P.,University of California at San Diego
Geosynthetics | Year: 2013

The focus is hydrated needlepunch-reinforced GCLs and their interface with textured high-density polyethylene geomembranes. Hydrated sodium bentonite has very low shear strength. Reinforced GCLs can be manufactured as needlepunched or stitch-bonded. Needlepunching is now the preferred method and involves the use of barbed needles to pull nonwoven fibers from one geotextile through the bentonite core and the opposite geotextile. Peak interface strengths for a GMX placed against the nonwoven side of a NP GCL are higher than those for the woven side due to extrusion of hydrated bentonite through the woven geotextile. The variability of normal stress at failure mode transition highlight the need for project-specific shear tests using representative materials and conditions. Observations of internal shear failure of NP GCLs are thus far limited to the laboratory because there are no known cases of internal shear failure of NP GCLs in the field.


Fox P.J.,University of California at San Diego | Athanassopoulos C.,CETCO | Thielmann S.S.,University of California at San Diego | Stern A.N.,Geosyntec Consultants
Geotechnical Engineering | Year: 2012

Lining systems for landfills and heap leach pads are often constructed with compacted clay liners (CCLs) containing significant amounts of gravel. Geomembranes placed against gravelly CCLs are vulnerable to damage due tohighoverburden stress andinterface shear displacement. This invited paper reports results from the first experimental investigation of shear-induced damage to geomembranes placed in contact with gravelly compacted clay. A series of large-scale direct shear tests was conducted for the interface between smoothHDPE geomembranes and CCLs with 20 percent gravel. The tests were performed for normal stress levels ranging from 72 to 1658 kPa to simulate overburden stresses associated with bottom liner systems. Replicate interface shear tests were also performed for normal stresses up to 4145 kPa with a geosynthetic clay liner (GCL) placed in between the geomembrane and the CCL to evaluate protection provided by the GCL. Results indicate that shear displacement between a geomembrane and a gravelly CCL under high normal stress conditions can cause severe damage to the geomembrane. The testing program also found that placing a GCL between a geomembrane and a gravellyCCL can essentially eliminate such damage.


Fox P.J.,University of California at San Diego | Athanassopoulos C.,CETCO
Geosynthetics | Year: 2012

The geosynthetic clay liners (GCL) are composite materials whose engineering behavior is governed by geosynthetic components, sodium bentonite, and their interaction. As a result, shear strength of GCLs and GCL interfaces can be affected by many factors, including normal stress, hydration/ consolidation procedure, shear direction, shear displacement rate, drainage condition, specimen gripping surfaces, and total shear displacement. The shear strength behavior of GCLs is more complex than for any other geosynthetic material and proper care must be taken to achieve reliable results. Gripping surfaces should provide high friction against a test specimen, good drainage, and no interference with the shearing process. Clamping systems can be use to secure the ends of the geosynthetics but should not materially participate in the shearing process. GCL shear strength should be measured for hydration and normal stress conditions expected in the field.


Novak V.I.,CETCO | Dolmatov V.V.,Raspadskaya CPP
International Coal Preparation Congress 2010, Conference Proceedings | Year: 2010

The froth flotation is one of the most expensive among coal cleaning processes, but at the same time it is traditionally wide used for the fine metallurgical coal washing "down-to-zero." In some cases, depending on coal properties there is a possibility to utilize equally effective but much cheaper technology instead of flotation. This paper describes the specificities of such choice with reference to the Raspadskaya washing plant terms where the selective fine slime flocculation technology has been successfully used for more than four years.


News Article | February 16, 2017
Site: marketersmedia.com

The global Geo-synthetics market is valued at $8.47 billion in 2015 and projected to grow at a compound annual growth rate (CAGR) of 12.1% reaching $18.92 billion by 2022. Geo-synthetics are broadly used in coastal engineering, environmental applications, construction industries and civil engineering. The Global Geo-synthetics market is mainly driven by large scale capital projects undertaken by government bodies to improve civic facilities. Geo-textiles has major share in the geo-synthetics value market and would remain the largest shareholder till 2022 preceded by geo-membranes. Geographically, North America dominated the geo-synthetics market Asia Pacific is expected to gain major size by value. Asia-Pacific market is driven by lucrative investment in projects including building and maintaining transport infrastructure and waste management. Major players in the geo-synthetics market include ADS Incorporated, Agru America, Inc., AMCOL International Corporation, Asahi Kasei Corporation, Ashimori Industry Company Limited, CETCO, Dow Chemical Company, GSE Environmental, Inc, Hanes Geo Components, Low & Bonar plc, NAUE GmbH & Co. KG, Officine Maccaferri S.p.A., Polymer Group Inc., Propex Operating Company LLC and Raven Industries, Inc. Regions Covered: • North America o US o Canada o Mexico • Europe o Germany o France o Italy o UK o Spain o Rest of Europe • Asia Pacific o Japan o China o India o Australia o New Zealand o Rest of Asia Pacific • Rest of the World o Middle East o Brazil o Argentina o South Africa o Egypt What our report offers: - Market share assessments for the regional and country level segments - Market share analysis of the top industry players - Strategic recommendations for the new entrants - Market forecasts for a minimum of 7 years of all the mentioned segments, sub segments and the regional markets - Market Trends (Drivers, Constraints, Opportunities, Threats, Challenges, Investment Opportunities, and recommendations) - Strategic recommendations in key business segments based on the market estimations - Competitive landscaping mapping the key common trends - Company profiling with detailed strategies, financials, and recent developments - Supply chain trends mapping the latest technological advancements 8 Global Geosynthetics Market, By Geography 8.1 North America 8.1.1 US 8.1.2 Canada 8.1.3 Mexico 8.2 Europe 8.2.1 Germany 8.2.2 France 8.2.3 Italy 8.2.4 UK 8.2.5 Spain 8.2.8 Rest of Europe 8.3 Asia Pacific 8.3.1 Japan 8.3.2 China 8.3.3 India 8.3.4 Australia 8.3.5 New Zealand 8.3.8 Rest of Asia Pacific 8.4 Rest of the World 8.4.1 Middle East 8.4.2 Brazil 8.4.3 Argentina 8.4.4 South Africa 8.4.5 Egypt For more information, please visit https://www.wiseguyreports.com/sample-request/918788-geosynthetics-global-market-outlook-2016-2022


"Grouting material is a flowable plastic material and should have negligible shrinkage to fill the gap or voids completely and should remain stable without cracking, de-lamination or crumbling.  Injection grouting is a process of filling the cracks, voids or honeycombs under pressure in concrete or masonry structural members for repairing of cracks, strengthening of damaged concrete or masonry structural members." Scope of the Report:  This report focuses on the Grouting Material in Global market, especially in North America, Europe and Asia-Pacific, South America, Middle East and Africa. This report categorizes the market based on manufacturers, regions, type and application. Market Segment by Manufacturers, this report covers  Sika  Fosroc  LATICRETE  Custom Building Products  ITW Wind Group  GCP Applied Technologies  Mapei  CICO Technologies (CTL)  Ambex Concrete Technologies  Five Star Products  Jinqi Chemical Group  Fischer Spezialbaustoffe  Nanjiang  A.W. Cook Cement Products  Psiquartz  TCC Materials  DMAR  Roundjoy  CETCO (Minerals Technologies)  Sobute New Materials Market Segment by Regions, regional analysis covers  North America (USA, Canada and Mexico)  Europe (Germany, France, UK, Russia and Italy)  Asia-Pacific (China, Japan, Korea, India and Southeast Asia)  South America, Middle East and Africa Market Segment by Applications, can be divided into  Mining industry  Traffic industry  Water conservancy industry  Construction industry  Others Global Grouting Material Market by Manufacturers, Regions, Type and Application, Forecast to 2021 1 Market Overview  1.1 Grouting Material Introduction  1.2 Market Analysis by Type  1.2.1 Urethane based grout  1.2.2 Epoxy based grouts  1.2.3 Others  1.3 Market Analysis by Applications  1.3.1 Mining industry  1.3.2 Traffic industry  1.3.3 Water conservancy industry  1.4 Market Analysis by Regions  1.4.1 North America (USA, Canada and Mexico)  1.4.1.1 USA  1.4.1.2 Canada  1.4.1.3 Mexico  1.4.2 Europe (Germany, France, UK, Russia and Italy)  1.4.2.1 Germany  1.4.2.2 France  1.4.2.3 UK  1.4.2.4 Russia  1.4.2.5 Italy  1.4.3 Asia-Pacific (China, Japan, Korea, India and Southeast Asia)  1.4.3.1 China  1.4.3.2 Japan  1.4.3.3 Korea  1.4.3.4 India  1.4.3.5 Southeast Asia  1.4.4 South America, Middle East and Africa  1.4.4.1 Brazil  1.4.4.2 Egypt  1.4.4.3 Saudi Arabia  1.4.4.4 South Africa  1.4.4.5 Nigeria  1.5 Market Dynamics  1.5.1 Market Opportunities  1.5.2 Market Risk  1.5.3 Market Driving Force 2 Manufacturers Profiles  2.1 Sika  2.1.1 Business Overview  2.1.2 Grouting Material Type and Applications  2.1.2.1 Type 1  2.1.2.2 Type 2  2.1.3 Sika Grouting Material Sales, Price, Revenue, Gross Margin and Market Share  2.2 Fosroc  2.2.1 Business Overview  2.2.2 Grouting Material Type and Applications  2.2.2.1 Type 1  2.2.2.2 Type 2  2.2.3 Fosroc Grouting Material Sales, Price, Revenue, Gross Margin and Market Share  2.3 LATICRETE  2.3.1 Business Overview  2.3.2 Grouting Material Type and Applications  2.3.2.1 Type 1  2.3.2.2 Type 2  2.3.3 LATICRETE Grouting Material Sales, Price, Revenue, Gross Margin and Market Share  2.4 Custom Building Products  2.4.1 Business Overview  2.4.2 Grouting Material Type and Applications  2.4.2.1 Type 1  2.4.2.2 Type 2  2.4.3 Custom Building Products Grouting Material Sales, Price, Revenue, Gross Margin and Market Share  2.5 ITW Wind Group  2.5.1 Business Overview  2.5.2 Grouting Material Type and Applications  2.5.2.1 Type 1  2.5.2.2 Type 2  2.5.3 ITW Wind Group Grouting Material Sales, Price, Revenue, Gross Margin and Market Share  2.6 GCP Applied Technologies  2.6.1 Business Overview  2.6.2 Grouting Material Type and Applications  2.6.2.1 Type 1  2.6.2.2 Type 2 3 Global Grouting Material Market Competition, by Manufacturer  3.1 Global Grouting Material Sales and Market Share by Manufacturer  3.2 Global Grouting Material Revenue and Market Share by Manufacturer  3.3 Market Concentration Rate  3.3.1 Top 3 Grouting Material Manufacturer Market Share  3.3.2 Top 6 Grouting Material Manufacturer Market Share  3.4 Market Competition Trend 4 Global Grouting Material Market Analysis by Regions  4.1 Global Grouting Material Sales, Revenue and Market Share by Regions  4.1.1 Global Grouting Material Sales by Regions (2011-2016)  4.1.2 Global Grouting Material Revenue by Regions (2011-2016)  4.2 North America Grouting Material Sales and Growth (2011-2016)  4.3 Europe Grouting Material Sales and Growth (2011-2016)  4.4 Asia-Pacific Grouting Material Sales and Growth (2011-2016)  4.5 South America Grouting Material Sales and Growth (2011-2016)  4.6 Middle East and Africa Grouting Material Sales and Growth (2011-2016) 5 North America Grouting Material by Countries  5.1 North America Grouting Material Sales, Revenue and Market Share by Countries  5.1.1 North America Grouting Material Sales by Countries (2011-2016)  5.1.2 North America Grouting Material Revenue by Countries (2011-2016)  5.2 USA Grouting Material Sales and Growth (2011-2016)  5.3 Canada Grouting Material Sales and Growth (2011-2016)  5.4 Mexico Grouting Material Sales and Growth (2011-2016) 6 Europe Grouting Material by Countries  6.1 Europe Grouting Material Sales, Revenue and Market Share by Countries  6.1.1 Europe Grouting Material Sales by Countries (2011-2016)  6.1.2 Europe Grouting Material Revenue by Countries (2011-2016)  6.2 Germany Grouting Material Sales and Growth (2011-2016)  6.3 UK Grouting Material Sales and Growth (2011-2016)  6.4 France Grouting Material Sales and Growth (2011-2016)  6.5 Russia Grouting Material Sales and Growth (2011-2016)  6.6 Italy Grouting Material Sales and Growth (2011-2016)

Loading CETCO collaborators
Loading CETCO collaborators