scholarly journals COASTAL SAND MINING IN NORTHERN CALIFORNIA, U.S.A.

1972 ◽  
Vol 1 (13) ◽  
pp. 83
Author(s):  
Orville T. Magoon ◽  
John C. Haugen ◽  
Robert L. Sloan

The commercial mining of sand at coastal locations along California has been a continuing activity at some sites, sporadic at others and altogether discontinued at still other sites. This mining activity includes all methods of sand mining (dragline, self-propelled bottom-dump scrapers, diesel shovels, etc.) and may be classified by littoral zone location as (1) mining from a beach foreshore or backshore area wetted by the normal tidal range, (2) mining within a river mouth or other estuary upstream from the ocean but still within the tidal zone, and (3) mining from bluff or dune areas not wetted by the normal range of tides but still within the littoral system. Processing of the sand thus mined takes place when the material is transported from the mining site, usually by end dump trucks or belt conveyor to either a fixed or a portable plant. Commercial uses of the sand thus mined fall into two general categories, (1) construction and (2) special purposes. Construction usage includes aggregate for concrete, asphalt, mortar, plaster and stucco, base material in road construction, and fill and structural backfill. Specialty uses include sand blasting and filtration material, foundry and engine sands, and raw material for manufacture of glass and ceramics. Within the area studied (see Figure 1) the Monterey Bay area has the highest concentration of mining activity. To the north, the area around Fort Bragg yields significant quantities to the commercial miner. Most of the remaining coastal sand mining activity is concentrated in the San Francisco area.

2012 ◽  
Vol 174-177 ◽  
pp. 1188-1192 ◽  
Author(s):  
Lian Yu Wei ◽  
Zhi Yu Guo

In recent years, due to the dual pressures of resources and the environment,the clod recycled technology renovation and expansion of the old road and new road construction process increasingly attention increasingly wide range of applications. In this paper, the water stability of the cold recycled materials in asphalt pavement on cement additives, frozen stability, thermal shrinkage resistance, dry Shrinkage thefour indicators of experiments to evaluate its durability, and compared with the typical semi-rigid material. To verify the feasibility of the cold recycled material as road base material.


2012 ◽  
Vol 5 ◽  
pp. 310-315 ◽  
Author(s):  
Yao Chen ◽  
Yi Qiu Tan

In seasonally frozen regions, road construction often suffers from low strength,lack of durability, etc. Improving the typical clay’s workability in Changchun with lime and the Base-Seal stabilizer (BS-100) shows promising results. A comprehensive investigation to assess the soil characteristics influence is undertaken, so as the lime and liquid stabilizer (BS-100) content on the physical properties of stabilized soils in seasonally frozen regions. The optimum mix proportions, unconfined compressive strength, splitting strength, modulus of resilience, freeze-thaw action, water resistance and penetration-resistance were outlined. By comparing with current specifications, the Base-Seal stabilized soil as base material has higher early strength, higher after-strength and better frost stability.The results can be applied in road construction in seasonally frozen regions.


Soil Research ◽  
1996 ◽  
Vol 34 (1) ◽  
pp. 161 ◽  
Author(s):  
CH Thompson ◽  
EM Bridges ◽  
DA Jenkins

An exploratory examination has been made of three different kinds of hardpans found in humus podzols (Humods and Aquods) of the coastal lowlands of southern Queensland, by means of slaking tests, a reactive aluminium test, acid oxalate and pyrophosphate extractions and electron microscopy. Samples from three indurated layers exposed by erosion or sand-mining in large coastal dunes were included for comparison. The investigation confirmed that, a pan in a bleached A2 (albic E) horizon is most likely caused by particle packing and that a pan in a black B2h (spodic) horizon is cemented by an aluminium-organic complex. Yellow-brown pans underlying black organic pans (spodic horizons) were found to be cemented by both a proto-imogolite/allophane complex and an organic substance. An inorganic reactive Al complex differing from the proto-imogolite allophane recorded in the overlying giant podzols appeared to be main cement of three indurated layers in the nearby coastal sand dunes. Mechanical disturbance of the pans, e.g. ripping, is unlikely to improve drainage and effective soil depth in the long term, because the disturbed zones are expected to be re-sealed by packed particles or by the aluminium-organic complex cement.


2019 ◽  
Vol 9 (1) ◽  
pp. 367-373 ◽  
Author(s):  
Katarzyna Komisarczyk ◽  
Przemyław Czapik ◽  
Kamila Komisarczyk

AbstractThe challenge related to waste management has become a serious worldwide environmental problem. Highly sustainable solutions, which do not involve reworking the material and are based on waste utilization, are sought. Such waste as used casting compounds, which so far has been used, among others, in construction, road construction, mining and cement production. Descriptions of the use of various waste moulding compounds, such as waste quartz compounds with water glass, quartz chamotte and quartz bentonite can be found in the literature. Due to the high content of quartz and low toxicity of bentonite sandmix, an attempt was done to use them for the production of sand-lime products.The aim of this article is to determine the suitability of the waste material as a substitute for quartz sand in the production of sand-lime products. The usability of waste was determined by laboratory tests of physicochemical characteristics of the finished silicates. Sand, which is a carrier of silica, was replaced with used moulding compounds with fractions up to 0.5 mm, in the weight amounts of 5.5, 11 and 16.5%. Applying up to 11% of used casting materials as a substitute for quartz sand with a lime content of 5.5% in the raw material mixture has a clearly positive effect on compressive strength. However, the higher share of sand substitution in the mixture weakens the mechanical features of the obtained materials. The absorptivity of the finished products increases with the increase of the inserted additions’ amounts. The influence of significant amounts of casting compound additives on the microstructure of calcium-silicate products was studied as well. It was stated, that they affect the location of the tobermorite in the volume of the autoclaved material.


2020 ◽  
Vol 10 (8) ◽  
pp. 2933 ◽  
Author(s):  
M. Morales-Máximo ◽  
V.M. Ruíz-García ◽  
L. B. López-Sosa ◽  
J. G. Rutiaga-Quiñones

This study describes the exploitation of wood waste (Pinus spp.) in the form of sawdust and shavings generated during the production of furniture and artisanal items in a community in the state of Michoacán, western Mexico. A process is described to densifying this raw material, to produce solid-type biofuel briquettes that can be used to satisfy the need to generate low-power heat for residential sectors. Briquette production involved six stages: (a) gathering samples of sawdust and shavings from artisanal workshops in the community; (b) proximal characterization of the samples; (c) elaborating the briquettes; (d) physicochemical characterization of the briquettes; (e) evaluation of the physical-thermal combustion of the briquettes; and (f) an economic evaluation of briquette production to determine viability. Finally, we performed a comparative analysis of the energy, economic, and environmental indicators of the briquettes produced and conventional pine and oak firewood (Pinus spp., Quercus spp.) in the study community. The results show the viability of using biomass residues to make briquettes, which are efficient, economic and easy to make and use.


2015 ◽  
Vol 814 ◽  
pp. 418-424
Author(s):  
Li Li Zhao ◽  
Zhi Hong Wang ◽  
Yu Liu ◽  
Xian Zheng Gong ◽  
Feng Gao ◽  
...  

The global warming of cement concrete pavement from raw material extraction to road construction was analyzed by the method of life cycle assessment. The characterization results showed that the procedure of producing material is the most important stage to emit greenhouse gas and it accounts for 98.5% of the global warming potential that caused by the material production and construction stage. For the materials used in different structure layers, surface layer is the biggest impact of greenhouse and accounts for 68.9% of the total impact caused by material used in constructing pavement. Therefore in the future, by using recycled materials or more environmental materials will be a good way to reduce environment impact.


2010 ◽  
pp. 215-222
Author(s):  
Ágnes Dergez ◽  
Lajos Blaskó ◽  
Diána Bordás ◽  
György Zsigrai ◽  
István Kiss ◽  
...  

Significant part of not cultivated area of Hungary is not suitable for agricultural utilization because of industrialpollution. Technologies of biorefinery make reutilization of contaminated areas possible. Biomass of plantsproduced on polluted soils can be raw material of valuable products. Applicability of biorefinery was tested on aheavy metal polluted soil, where the contamination originated from previous mining activity. Complete biomassutilization was aimed to obtain cosmetic ingredients, pharmaceutical agents, and precursors. During our researchwork 88 plant species and varieties were produced and tested for potential utilizable components. Levels ofpossible contaminants in these plants were monitored, and amounts of carbohydrates, protein, organic acid andcellulose were determined as well. Different plant extracts were tested as potential sources of biologically effectivecomponents or as raw materials for lactic acid fermentation. Our results show that biorefinery is a real possibilityfor utilization of polluted areas. Numerous plants could be cultivated on contaminated areas without increasedlevels of contaminants in their tissues, thus they can be sources of valuable compounds.


Author(s):  
Fernando Casas

Fernando Casás: a note about the artist.www.fernandocasas.es  Fernando Casás [Vigo, Spain, 1946], lives between Brazil – where he spent most part of his life – and Spain, where he is professor of Sculpture at the University of Vigo. He is also professor in Doctorate courses at ESAD Escola Superior Artística do Porto, Portugal. He began working and investigating with Art and Nature [Land Art, Eco Art, Earth Works] at the end of the sixties, influenced by the tropical environment. Since then he works in different, paralell and recurrent streams: a de-materialized side [like the Idiotic Projects, the capture of a fleeting moment];  the ephemeral works [like the Wanderer Project  or the Earth 100 / Latex, where he makes small and intimate incursions at random in the natural environment] ;  and finally what we could call the formal works, where evidenciation of the passing of time and investigation of new ways are the major concerns, and where he works with different techniques, procedures and materials, ranging from worn out raw material to new technologies, which result in works that can be seen in exhibitions, collections or public places [The Termite Cycle, Trees as Archaeology or Act / Impact]. Nowadays he is considered by art critics as a pioneer in the Art and Nature field.  Among public works: Lamed Vav / The 36 Justs together with R.Morris, R.Long, Hamilton Finlay. Island of Sculptures, and Memory of the River, both in Pontevedra, Spain, 1999 and 2006.Two Stones two University Botanic Graden, Jerusalem, Israel. 2000.Amazonia / Roots. Catacumba Sculpture Park, Rio de Janeiro, Brasil. 1989.Wood. Burgo das Nacións Square, Santiago de Compostela, Spain. 1994.Big Snake. Seeff & Marks Community Center, Jerusalem, Israel. 1989.Threes as Archaeology together with R. Long, S.Armajani, U.Rükriem, D.Nash. Monegros Desert,  Huesca,  Spain. 2003.Ashé / The Curve of the 9 over Bayona sea, in the road that unites Galicia and Portugal. 2005.Apple trees for Carrazeda. Carrazeda de Ansiães, Portugal, 2009. Selected exhibitions:Solo Termites tunnels at Centro Cultural dos Correios. [Río de Janeiro, 2009]Intervention Blue in Tifariti  Sahara Desert, during the International Encounters of Art in the Free Territories of Sahara. [Argelia, 2009].Retrospective solo exhibition in the series Great Galician Artists [Caixanova, Vigo, 2006]Naturally Artificial. [Museo Esteban Vicente, Segovia, 2006]Archaeology of the non site. [Círculo de Bellas Artes, Madrid, 2004]A wood in works: Spanish vanguards in wood. [Museo de Arte Contemporáneo Esteban Vicente, Segovia y Sala de las Alhajas, Madrid, 2000]XXIª International Beinnial of São Paulo [Säo Paulo, Brasil, 1991]Brazilian work:  1964 – 1984 [Retrospectiva en la Fundación Luís Seoane, A Coruña, 2000]Fragments of America [Convento de San Francisco de la Habana Vieja, Cuba. 1999] Possible Dimension [Museu de Arte Moderna de Säo Paulo, Brasil, 1991]Manuscripten van de Amazon Rivier [EKWC Europees Keramisch Werkcentrum, den Bosch, The Netherlands, 1994]Amazonas, Série Negra [Galería Ibeu-Copacabana y Casa de Cultura Laura Alvim, Río de Janeiro; Galeria Aquarela y Espaço Unicamp, Säo Paulo, 1988 y 1989]Camouflaged Earth  [Municipal Gallery, Jerusalem, Israel y Centre Culturel Bresilien, Ginebra, Suiza, 1987]De Huid van de Witte Dame [Phillips Headquarters, Eindhoven, Holanda, 1996]Intervention for Ecology  [Museu de Arte Moderna do Rio de Janeiro, Brasil, 1984). El Proyecto Errante fue llevado a Suiza, Francia, Israel, Holanda, entre otros países.  Selection of books and catalogues:Wagensberg, Jorge;  A.Ruiz de Samaniego et.al.: Fernando Casás: Archaeology of the non site, Hércules de Eciciones and Círculo de Bellas Artes. Madrid, 2004.Parreño, José María;  Pignatari, Décio: Fernando Casás: Retrospective at Caixanova. Vigo, 2006.Duque, Félix; Katz, Renina: Brazilian Works. Fundaçäo Luís Seoane, La Coruña, 2000.Maderuelo, Javier: Natürgeist. Diputación de Huesca, 1997.Garraud, Colette; Boël, Mickey: L’Artiste Contemporain et la Nature. Parcs et paysages européens. Éditions Hazan, Paris, 2007.


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