scholarly journals Centro Etnográfico Mandeo. Hormigón y memoria. *** Ethnographic Center Mandeo. Concrete and memory.

2018 ◽  
Author(s):  
María Belén Bouza Cora ◽  
Santiago Barge Ferreiros
Keyword(s):  
River Basin ◽  
The Self ◽  
Self Compacting Concrete ◽  
Del Rio ◽  
Single Material

En un entorno natural de gran valor paisajístico en la cuenca del río Mandeo, el centro, destinado a formación y divulgación, se concibe como una ‘cabaña’ que se integra en el bosque que lo rodea sin restarle protagonismo. El proyecto desarrolla el programa en una sucesión de volúmenes conectados entre sí, que pueden funcionar de forma autónoma o conjuntamente, lo que confiere al edificio una gran versatilidad de uso. La utilización del hormigón autocompactante (inyectado desde las partes inferiores de muros y cubiertas) en la configuración de los volúmenes, ha hecho posible la homogeneidad y compacidad y ha permitido asimismo resolver, con un único material, tanto la envolvente como la estructura del conjunto.***Located in the remarkable landscape of the Mandeo River basin, the Ethnographic Center is a space for education and information, and is conceived as a primitive ‘cabin’ that melds with the surrounding woods. The program is organized in a series of volumes that are interconnected, and that can function independently or jointly, a feature that gives the building a great versatility of use. The use of the self-compacting concrete (sprayed from the lower parts of the walls and roofs) to configure the walls has allowed to make them compact and homogeneous and has also allowed to resolve, with a single material, both the enclosure and the structure of the whole complex. 

Influence of fine sediments on rheology properties of the self-compacting concrete

2021 ◽  
Author(s):  
Nongwendé Philippe Ouedraogo ◽  
Frédéric Becquart ◽  
Mahfoud Benzerzour ◽  
Nor-Edine Abriak
Keyword(s):  
The Self ◽  
Self Compacting Concrete ◽  
Fine Sediments

scholarly journals Effects of Admixtures on the Self Compacting Concrete State of the Art Report

2020 ◽  
Vol 1006 ◽  
pp. 012038
Author(s):  
S Christopher Gnanaraj ◽  
Ramesh Babu Chokkalingam ◽  
G LiziaThankam
Keyword(s):  
State Of The Art ◽  
The Self ◽  
Self Compacting Concrete

The Compounding and Application Mechanism of Polycarboxylate-Based Superplasticizers in the Self-Compacting Concrete

2011 ◽  
Vol 250-253 ◽  
pp. 711-717 ◽  
Author(s):  
Miao Miao Gui ◽  
Yun Hui Fang ◽  
Zi Dong Lan ◽  
Fei Yu Yu ◽  
Tian Xing Lin ◽  
...  
Keyword(s):  
Steric Hindrance ◽  
Graft Copolymerization ◽  
Raw Materials ◽  
The Self ◽  
Main Mechanism ◽  
Self Compacting Concrete ◽  
The Given ◽  
Copolymerization Reaction

Polycarboxylate-based superplasticizers are synthesized by radical graft copolymerization reaction, and the products are divided into ester series (PC-1) and ether series (PC-2) on the basis of different big monomers. This article studies on influence of the different composition and dosages of the synthetic superplasticizers in the self-compacting concrete (SCC). The results show that the requirements of SCC workability can be achieved through simple adjustment kinds and dosages of the synthetic superplasticizers under the given mix proportions and the raw materials. And the main mechanism of the polycarboxylate-based superplasticizers is steric hindrance effect.

scholarly journals Datos sobre la flora y vegetación de la cuenca del río Guadiamar (Sevilla-Huelva, España).

2002 ◽  
Vol 27 ◽  
pp. 189-228 ◽  
Author(s):  
Andrés V. Pérez Latorre ◽  
Patricia Navas ◽  
David Navas ◽  
Yolanda Gil ◽  
Baltasar Cabezudo
Keyword(s):  
River Basin ◽  
Alnus Glutinosa ◽  
Nerium Oleander ◽  
Populus Alba ◽  
Ulmus Minor ◽  
Guadiamar River ◽  
Sierra Morena ◽  
Fraxinus Angustifolia ◽  
Del Rio ◽  
Vegetation Series

RESUMEN. Datos sobre la flora y vegetación de la cuenca del río Guadiamar (Sevilla-Huelva, España). Sc ha realizado un estudio florístico, fitocenológico y fitogeográfico de la cuenca hidrográfica del río Guadiamar (Sevilla-Huelva, Andalucía, España). Bioclimáticamente domina en la cuenca el piso termomecliterráneo (con un reducto mesomediterráneo al NW) y el ombrotipo subhúmedo (seco al S). Se propone una sectorización fitogeográfica para la cuenca a un nivel inferior al de sector y resaltando el papel de conector de la cuenca del Guadiamar entre la provincia Luso-Extremadurense (Sierra Morena) y la Tingitano-Onubo-Algarviense (arenales y marismas). Como resultado sobre la flora, se presenta un conjunto de especies de interés por estar protegidas, por su escasez en la cuenca, en Andalucía Occidental, o por indicar determinados ecosistemas frágiles o singulares. Respecto a la vegetación, el territorio presenta una gran diversidad de asociaciones y comunidades (96), algunas de ellas son novedades sintaxonómicas: Imperato cylindricae-Scirpetum holoschoeni, Cisto salvifolii-Ulicetum australis lavanduletosum sampaianae, Malcomio trilobae-Hytnenocarpetum hamosi loeflingietosunz baeticae, Ornithopi isthmocarpi-Anthoxantetum ovati y vulpietosum alopecuroris, Ranunculo peltati-Callitrichetum brutiae y Ranunculo hederacei-Callitrichetum stagnalis. Además se lectotipifican Polypogono monspeliensis-Ranunculetum scelerati y Scolymo maculati-Sylibetum mariani. Se han catalogado 13 series de vegetación, 5 de tipo climatófilo, dominadas por fagáceas (Quercus suber y Quercus rotundtfolia) con faci aciones de Pious pinea, Olea europaea var. sylvestris o Quercus broteroi, y 8 de tipo edafohidrófi lo (caracterizadas respectivamente por Populus alba, Fraxinus angustifolia, Ulmus minor, Alnus glutinosa, Salix pedicellata, Nerium oleander, Tamariz gallica y Securinega tinctorea). Así mismo, aparecen complejos edafogénicos (mosaicos) de vegetación halófila en Entremuros (Parque Natural de Doñana) y de vegetación dulceacuícola por toda la cuenca. La vegetación permanente edafoxerófila corresponde a Genistetum polyanthi. Se presentan un esquema sintaxonómico, tablas fitosociológicas de novedades y un mapa de las series de vegetación.Palabras clave. Flora, vegetación, Fitogeografía, río Guadiamar, Sevilla, Huelva, Andalucía, España.SUMMARY. Flora and vegetation in the basin of the Guadiamar river (Seville-Huelva, Spain). We have carried out a floristical, phytocoenological and phytogeographical study about the Guadiamar river basin (Seville-Huelva, Andalusia, Spain). Thermo-mediterranean bioclimatic belt (appearing a little meso-mediterranean belt area towards NW) and sub humid ombro-type (dry towards S) characterises the basin. It is proposed a phytogeographical scheme under sector level for the Guadiamar basin. Stands out the corridor role of the Guadiamar river between the phytogeographical provinces Luso-Extremadurense (Sierra Morena) and Tingitano-Onubo- Algarviense (sandy lands and marshes). A group of species are highlighted as a result of being protected, rare in the basin or in Western Andalusia or because of living in fragile or singular ecosystems. Regarding the vegetation, a high diversity of plant communities has been found (96), some of them are new syntaxa or combinations: Impercaocylindricae-Scirpetumholoschoeni, Cisto salvifolii-Ulicetum australis lavanduletosum sampaianae, Malcomio trilobae- flymenocarpetum hamosi loeflingietosum baeticae, Ornithopi istlunocarpi-Anthoxantetum ovati and vulpietosutn alopecuroris, Ranunculo peltati-Callitrichetum brutiae, Ranunculo hederacei- Callitrichetum stagnalis. Two syntaxa are lectotypified here: Polypogono tnonspeliensis- Ranunculetum scelerati and Scolymo niaculati-Sylibetum mariani. 13 vegetation series have been recorded: 5 climactic, characterised by Quercus sober and Quercus rotundifolia showing variants with Pious pinea, Olea sylvestris or Quercus broteroi. 8 series are linked to riverside biotopes and respectively characterised by Populus alba, Fraxinus angustifolia, Ulmus minor, Alnus glutinosa, Salix pee/ice//ala, Nerium oleander, Tamarix gal lica and Securinega tinctorea. Halophytic vegetation (mosaics) is located in Entremuros near the Doilana marshes and also wetlands with hydrophilic vegetation are spread all over the basin. Soil-xeric permanent vegetation is represented by Genistetum polyanthi. A syntaxonomical scheme, phytosociological tables and one map of the vegetation series are also included.Key words. Flora, vegetation, Phytogeography, Guadiamar river basin, Seville, Huelva, Andalusia, Spain.

scholarly journals ANALISES DOS PADRÕES E ESTILOS DE CANAIS A PARTIR DA PAISAGEM GEOMORFOLÓGICA FLUVIAL NA BACIA DO RIO UNA/PE

2020 ◽  
Vol 14 (02) ◽  
pp. 71-92
Author(s):  
Adriana cassiano Silva ◽  
Osvaldo Girão da Silva
Keyword(s):  
River Basin ◽  
Drainage Network ◽  
Feature Structure ◽  
Palabras Clave ◽  
Index Mapping ◽  
Northeastern State ◽  
Longitudinal Profiles ◽  
La Red ◽  
Del Rio ◽  
Channel Patterns

Os estilos fluviais refletem a fisiografia estrutural da rede de drenagem controladas pelos estratos rochosos, retratando na paisagem sua dinâmica, assim como os padrões de canais, que podem ser alterados por processos geomorfológicos, climáticos e antrópicos. O quadro dos estilos fluvial fornece um modelo geomorfológico dos processos espaciais e temporais biofísicos para gestão e planejamento das bacias hidrográficas. O presente trabalho teve como objetivo analisar as influências do comportamento no canal da bacia do rio Una localizado no Nordeste do Estado de Pernambuco, a partir da investigação das feições da drenagem como reflexo da transferência de matéria e energia entre distintos compartimentos e setores do ambiente fluvial.  A metodologia proporcionou uma visão geral de toda área analisada, a partir da avaliação do índice de sinuosidade, mapeamento dos estilos e das feições fluviais, perfis longitudinais e trabalhos de observação em campo. Assim, constatou-se que a influência estrutural na rede de drenagem da referida bacia comandou a retilineidade do canal Una, com quebra no gradiente topográfico, inflexão do canal e vales encaixados. Nesse ambiente, verificou-se que a produção e deposição dos sedimentos estão vinculados as influências do clima tropical. Palavras-Chave: Feição Fluvial; Estrutura; Instabilidade; Deposição de Sedimentos.   ANALYSIS OF PATTERNS AND CHANNEL STYLE FROM THE LANDSCAPE GEOMORPHOLOGICAL FLUVIAL IN RIVER BASIN UNA/ PE Abstract The river styles reflect the structural physiography drainage network controlled by the rock strata, depicting the landscape dynamics, as well as channel patterns, which can be changed by geomorphological, climatic and anthropogenic processes. The fluvial styles of the table provides a geomorphological model of spatial processes and biophysical time for planning and management of river basins. This study aimed to analyze the influence of behavior on the channel of the river basin Una located in the northeastern state of Pernambuco, from the investigation of drainage features reflecting the transfer of matter and energy between different compartments and sections of the river environment. The methodology provided an overview of the whole analyzed area, from the evaluation of the sinuosity index, mapping styles and river features, longitudinal profiles and field observation work. Thus, it was found that the structural influence on the basin drainage network commanded the straightness of Una channel, breaking the topographic gradient, channel inflection and enclosed valleys. In this environment, it found that the production and deposition of sediments are bound influences the tropical climate. Keywords: Fluvial feature, structure, Instability, Deposition of Sediments.   ANÁLISIS DE PATRONES Y CANALES DE ESTILOS DE PAISAJE DEL RÍO GEOMORFOLÓGICO EN UNA DE CUENCA / PE Resumen Los estilos de los ríos reflejan la red estructural de drenaje fisiografía controlado por los estratos de roca, que representa la dinámica del paisaje, así como los patrones de canal, que puede ser cambiado por procesos geomorfológicos, climáticos y antropogénicos. Los estilos fluviales de la tabla proporciona un modelo geomorfológico de los procesos espaciales y el tiempo biofísico para la planificación y gestión de las cuencas hidrográficas. Este estudio tuvo como objetivo analizar la influencia del comportamiento en el canal de la cuenca del río Una ubicada en el nororiental estado de Pernambuco, a cercar de la investigación de las características de drenaje que refleja la transferencia de materia y energía entre los distintos compartimentos y secciones del entorno del río. La metodología proporciona una visión general de toda la zona analizada, de la evaluación del índice de sinuosidad, la cartografía de estilos y características de ríos, perfiles longitudinales y trabajos de observación de campo. Por lo tanto, se encontró que la influencia estructural en la red de drenaje cuenca mandó la rectitud de canal Una, rompiendo el gradiente topográfico, la inflexión del canal y valles cerrados. En este entorno, se encontró que la producción y deposición de sedimentos están obligados influencias del clima tropical. Palabras clave: río de funciones; la estrutura; la inestabilidad; la deposición de sedimentos.

scholarly journals Research on Design of the Landscape inside Mountain Torrent Basin Based on Ecological Restoration – Take the Research Base in Wenling City, Zhejiang Province as an Example

2021 ◽  
Vol 237 ◽  
pp. 04013
Author(s):  
Zhihao Zhang ◽  
Xidong Ma
Keyword(s):  
Ecological Restoration ◽  
River Basin ◽  
Economic Loss ◽  
Design Methods ◽  
Wetland Conservation ◽  
Zhejiang Province ◽  
The Self ◽  
Design Practice ◽  
Ecological Damage ◽  
Short Time

In order to reduce the ecological damage and economic loss caused by mountain torrent disasters in the flooded basin, it’s very important to realize the self-repair of the ecosystem in a short time. Based on the analysis of the causes of mountain torrents, this paper summarizes three main parts of ecological restoration in the river basin, including rainwater storage, Sedimentation and wetland conservation. Taking a research base in Wenling, Zhejiang Province as an example, this paper also discusses the design methods of the landscape inside mountain torrent basins based on ecological restoration from these parts above. Finally, these methods were obtained and applied in design practice, providing more solutions and theoretical references for the ecological restoration design in the future.

scholarly journals Peces de la subcuenca del río Tomo, Orinoquia colombiana: actualización de la lista de especies

2019 ◽  
pp. 12-33
Author(s):  
L. M. Mesa S. ◽  
C. A. Lasso ◽  
C. DoNascimiento
Keyword(s):  
New Species ◽  
River Basin ◽  
New Records ◽  
Additional Species ◽  
Orinoco River ◽  
Fish Collection ◽  
Del Rio

The Tomo River runs west to east through the high savannah, known as the 'Altillanura' in eastern Colombia, to flow directly into the Orinoco River. This updated ichthyological checklist was developed by revising and deleting five bibliographic references in combination with the results of an expedition carried out in April 2017 in the lower part of the sub–basin. Here we report 305 species of fish belonging to 183 genera, 45 families and 14 orders. The consolidated checklist includes 69 additional species for Tomo River, of which three species are new records for the Orinoco River basin and eight are new species for Colombia. In addition, we add 578 catalog numbers (10,423 specimens) to the fish collection of the Humboldt Institute (IAvH–P)

scholarly journals Experimental Study and Extended Finite Element Simulation of Fracture of Self-Compacting Rubberized Concrete

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Xinquan Wang ◽  
Hongguo Diao ◽  
Yunliang Cui ◽  
Changguang Qi ◽  
Shangyu Han
Keyword(s):  
Finite Element ◽  
Loading Rate ◽  
High Performance Concrete ◽  
The Self ◽  
Experimental Results ◽  
Crack Mouth Opening Displacement ◽  
Displacement Curve ◽  
Rubberized Concrete ◽  
Extended Finite Element ◽  
Self Compacting Concrete

Self-compacting rubberized concrete (SCRC) is a high-performance concrete that can achieve compacting effect by self-gravity without vibration during pouring. Because of its excellent fluidity, homogeneity, and stability, the application of self-compacting concrete in engineering can improve work efficiency and reduce project cost. The effects of loading rate on the fracture behavior of self-compacting concrete were studied in this paper. Three-point bend (TPB) tests were carried out at five loading rates of 1, 0.1, 0.001, 0.0001, and 0.00001 mm/s. The dimensions of the specimens were 100  mm × 100 mm × 400 mm. A precast crack was set in the middle of the specimen with a notch-depth ratio of 0.4. The experimental results show that the peak load on the load-CMOD (crack mouth opening displacement) curve gradually increases with the increase of the loading rate. Although the fracture energy a presented greater dispersion under the loading rate of 1 mm/s, the overall changes were still rising with the increase of the loading rate. Besides studying the softening characteristics of the self-compacting concrete, the constitutive softening curve of the self-compacting concrete was obtained using the bilinear model. Finally, curved three-point bending beams were simulated by using the extended finite element method based on ABAQUS. The fracture process of the self-compacting concrete under different loading conditions was analyzed more intuitively. The simulation results were compared with the experimental results, and the same conclusions were obtained.

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