Готові списки джерел за темами / Impact compaction

Добірка наукової літератури з теми "Impact compaction"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Impact compaction"

1

Iwański, Marek, Anna Chomicz-Kowalska, Piotr Ramiączek, Krzysztof Maciejewski, and Mateusz Iwański. "The influence of laboratory compaction methods on the physical and mechanical properties of foamed bitumen recycled mixes." Budownictwo i Architektura 13, no. 1 (March 11, 2014): 053–62. http://dx.doi.org/10.35784/bud-arch.1924.

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Анотація:
This study attempts to evaluate the influence of two advisable methods for compacting laboratory specimens of road base recycled mixes with foamed bitumen (MCAS) and bitumen emulsion (MCE). The obligatory regulations for this technology permit fabrication of the specimens using either an impact Marshall compactor or a static hydraulic press. The research showed that the compaction method influenced both the physical and mechanical properties of samples regardless of the type of bitumen binder. What is more, the structure of the material changed after the impact compaction process, which manifested in fact that many of the aggregate particles were crushed in its course. Better strength and resistance to moisture damage was observed in samples prepared in the hydraulic press. This was associated with lower void contents obtained in this compaction method.
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2

Santhana Krishnan, R., and Sudha Sindhuja Nayani. "Study of heat generation and dissipation mechanism for an exciter shaft and its impact." Journal of Physics: Conference Series 2054, no. 1 (October 1, 2021): 012084. http://dx.doi.org/10.1088/1742-6596/2054/1/012084.

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Анотація:
Abstract Compactor is a heavy-duty machinery that uses compaction to reduce the size of waste materials or biomass or compaction of load. A bearing is a machine element that restricts relative motion to only the desired motion, and decreases friction between moving parts. It is an essential component in a compactor and is used for supporting the exciter shaft. Compaction is achieved by vibration of roller drum, which in turn is achieved by means of generated at the exciter shaft with an eccentric mass. During this process of generation of forced excitation, heat is generated at shaft to bearing interface. The current heat generation and dissipation paths for the bearing on the exciter shaft of the compactor were studied and calculated. Suggestions for heat dissipation optimization are provided. Various optimization methods were devised for heat dissipation to improve the wear as well as efficiency of the bearing and further testing is required for implementation of same.
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3

Jiang, Chunlin, Yanhui Ge, Baoqun Wang, Luchen Zhang, and Youbo Liu. "Impact of the High-Energy Dynamic Compaction by Multiple Compactors on the Surrounding Environment." Advances in Civil Engineering 2021 (November 29, 2021): 1–19. http://dx.doi.org/10.1155/2021/6643064.

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Анотація:
Dynamic compaction machine (DCM) is a widely adopted ground reinforcement technology. However, dynamic compaction energy has a very significant impact on the surrounding environment. At present, the research on the impact of dynamic compaction mainly focuses on the effect of the tamping behavior of a single compactor in the working state, whereas the research on the impact of multiple compactors working jointly is rare. To study the impact of the dynamic compaction energy of multiple compactors working jointly on the surrounding environment, the dynamic response model for multiple compactors working in the same field was established based on the explicit dynamic analysis module in ABAQUS. The validity of the model was verified by comparison with the measured data. Based on this, the impact of the dynamic compaction energy of multiple compactors with different working conditions in terms of the arrangement, spacing, and working time interval was analyzed. The results showed that the arrangement and spacing of the compactors had a remarkable influence on the distribution of the dynamic compaction energy in the surrounding environment. Under the condition of multiple compactors working with a time interval of less than 10 s, the impact of the superimposed dynamic compaction energy due to the interaction of multiple compactors had to be considered.
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4

Gui, Meenwah, Truc Phan, and Thang Pham. "Impacts of Compaction Load and Procedure on Stress-Deformation Behaviors of a Soil Geosynthetic Composite (SGC) Mass—A Case Study." Applied Sciences 10, no. 18 (September 11, 2020): 6339. http://dx.doi.org/10.3390/app10186339.

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Анотація:
Fill compaction in the construction of Geosynthetic Reinforced Soil (GRS) mass is typically performed by operating a vibratory or roller compactor, which in turns imposed a compaction load in direction perpendicular to the wall face. The compaction process resulted in the development of the so-called compaction-induced stress (CIS), which may subsequently increase the stiffness and strength of the fill material. Compaction process is normally simulated using one of the following compaction procedures—(i) a uniformly distributed load acting on the top surface of each soil lift, (ii) a uniformly distributed load acting on the top and bottom surface of each soil lift, and (iii) a moving strip load with different width. Uncertainties such as compaction procedures, compaction and surcharge loads led to the disparity in studying the mechanism of GRS mass. This paper aimed to study the impact of compaction load, compaction procedure, surcharge load and CIS on the stress-deformation behavior of GRS mass via the simulation of a 2 m high Soil Geosynthetic Composite (SGC) mass and a 6 m high GRS mass. The results were examined in terms of reinforcement strains, wall lateral displacements, and net CIS. Results from the analysis show the important impacts of compaction conditions on the stress-deformation behavior of SGC mass and the CIS.
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5

Hata, Shojiro, and Kazuyoshi Tateyama. "Relationship between vibratory roller compaction and indoor impact compaction test." Journal of Terramechanics 24, no. 1 (January 1987): 119–20. http://dx.doi.org/10.1016/0022-4898(87)90091-7.

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6

Zhang, Kai, Zhan Yong Yao, Qing Sen Shang, and Xiu Guang Song. "Research of Impact Compaction Technology on Foundation and Subgrade in Yellow River Flooded Area." Advanced Materials Research 368-373 (October 2011): 1142–47. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.1142.

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Анотація:
To study the feasibility of impact compaction on the foundation and subgrade compaction in Yellow River flooded area and explore construction process and control parameters that could ensure good compaction results, experiment was conduct on impact compaction. By way of detecting the influence of impact compaction on settlement, moisture content and degree of compaction in different construction technology to analysis the feasibility of impact compaction on the foundation and subgrade compaction in Yellow River flooded area. By evaluating the effect of compaction of different construction techniques, appropriate construction technology and control parameters of impact compaction on foundation and subgrade in the Yellow River flooded area was summarized. Research results showed that impact compaction had a good compaction effect on foundation and subgrade in Yellow River flooded area. For foundation compaction, discontinuous impaction construction should be adopted and control parameters should use degree of compaction and settlement and the best impaction times should be 12 -14 times. For subgrade compaction, the thickness of the loose layer should be 80cm and the best impaction times should be 25-30 times.
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7

Niroumand, Bahman, and Hamed Niroumand. "Gravel impact compaction piers as a method of soil improvement." Revista de la construcción 21, no. 3 (2022): 539–54. http://dx.doi.org/10.7764/rdlc.21.3.539.

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The purpose of this study was to evaluate the performance of gravel impact compaction piers system (GICPs) in improving a 3.5m thick loose silty sand in a multilayer coastal soil system located in Bushehr, Iran. The liquefiable sandy soil layer was layered on clay layers with moderate to very stiff consistency and below the engineering embankment layer with a thickness of 1.8 m. Implementation of gravel impact compaction piers is a new generation of aggregate piers. Gravel impact compaction piers were used to improve the liquefiable soil layers and to increase the bearing capacity and reduce subgrade settlement to withstand surface infrastructures. The process of making gravel impact compaction piers in a triangular or square-patterned grid was created using three types of special mandrels and feeding and compacting the gravels in the cavity in several stages without removing the soil from the cavities. The experience gained in this case study showed that artificial liquefiable was created immediately after the construction of these piers in a limited area and the soil became unstable. After about 11-14 days, the soil stabilized rapidly. The results of the standard penetration test in the matrix soil around the piers showed that the amount of (N1)60 in compacted soils was in the range of 21-30 and on average 15 times the amount of (1-3) in the initial soil. Also, the relative density of the initial soil was increased from 25% to 75% after soil improvement. Accordingly, by relying merely on the compaction properties of the piers and without relying on other primary soil remediation factors, such as piers drainage and soil texture change, the safety factor of the improved soil is 1.7-1.95 times the minimum required according to the two risk levels in the design.
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8

Yuan, Yu Qing, Xuan Cang Wang, and Hui Jun Shao. "Study on Impact Compaction of Aeolian Sand Subgrade and its Effect Evaluation." Advanced Materials Research 378-379 (October 2011): 370–73. http://dx.doi.org/10.4028/www.scientific.net/amr.378-379.370.

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Анотація:
In order to solve the problem of aeolian sand subgrade compaction, we studied the technology of impact compaction, applied it to the engineering practice and analyzed its effect with Rayleigh wave. The technology of impact compaction can combine the compaction of potential energy and kinetic energy and make it easier for the materials to reach their elastic stage. With the combined function of "knead-roll-impact", the impact compaction road roller can compact the soil body and offer 6～10 times impact force and 3～4 times the depth of influence more than the vibratory roller. The impact compaction methods of aeolian sand subgrade were put forward. The comparative field compaction tests between impact and vibratory compaction are carried through, which are detected by Rayleigh wave. The results show that the impact compaction can make the density of the aeolian sand subgrade 2～5% higher than the vibratory compaction, and reach the influence depth of 7 metres. To sum up, the impact compaction can clearly increases the strength and stiffness of aeolian sand subgrade with a dynamic elastic modulus of 202.63MPa.
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9

Wu, J. Y., and J. X. Wang. "The Application of Impact Tester for Compaction Control." Applied Mechanics and Materials 501-504 (January 2014): 254–57. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.254.

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Анотація:
The safety of the earth structures is highly dependent upon the fill compaction quality. Recently developed nondestructive testing techniques (NDT) present many advantages in comparison with conventional field density measurements. Therefore, use of NDT in monitoring of the fill quality appears to be attractive for future pavement geotechnics applications. This paper presents an alternative technology using non-destructive Clegg impact tester for compaction control in silty sand. 132 compaction tests and impact tests with varying values of compaction effort, moisture content, and density were conducted in laboratory. Each observed impact value (Iv) was then considered as a function of its corresponding compaction effort, moisture content and dry density. Results of the study show that for the silty sand tested, the variations of Iv with moisture content are similar to the corresponding unique moisture-density compaction relationship. The values of Iv generally correlate well with moisture-density relationship for each compaction effort. Along with a speedy moisture tester, dry density can be predicted using target Iv values in a fast and efficient manner based on current standard specification.
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10

Yuan, Yu Qing, Wei Li, Tian Wen Yang, and Tao Guo. "Impact Compaction Technology of Filling Subgrade with Yellow River Sandy Soil." Applied Mechanics and Materials 193-194 (August 2012): 717–20. http://dx.doi.org/10.4028/www.scientific.net/amm.193-194.717.

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Анотація:
In order to reduce sinking after subgrade construction, impact compaction technology was put forward. The engineering characteristics of Yellow River sandy soil located in Kaifeng, and impact compaction technologies were analyzed. The contrast tests were also carried through, including vibration compaction and impact one. The results show that the subgrade can obtain higher compaction degree with impact compaction technology than the other method, with 2%-5% increasing.
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Дисертації з теми "Impact compaction"

1

Mohanty, Biswajeet. "Impact of Cassandra Compaction on Dockerized Cassandra’s performance : Using Size Tiered Compaction Strategy." Thesis, Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13273.

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Анотація:
Context. Cassandra is a NoSQL Database which handles large amount of data simultaneously and provides high availability for the data present. Compaction in Cassandra is a process of removing stale data and making data more available to the user. This thesis focusses on analyzing the impact of Cassandra compaction on Cassandra’s performance when running inside a Docker container. Objectives. In this thesis, we investigate the impact of Cassandra compaction on the database performance when it is used within a Docker based container platform. We further fine tune Cassandra’s compaction settings to arrive at a sub-optimal scenario which maximizes its performance while operating within a Docker. Methods. Literature review is performed to enlist different compaction related metrics and compaction related parameters which have an effect on Cassandra’s performance. Further, Experiments are conducted using different sets of mixed workload to estimate the impact of compaction over database performance when used within a Docker. Once these experiments are conducted, we modify compaction settings while operating under a write heavy workload and access database performance in each of these scenarios to identify a sub-optimal value of parameter for maximum database performance. Finally, we use these sub-optimal parameters to perform an experiment and access the database performance. Results. The Cassandra and Operating System related parameters and metrics which affect the Cassandra compaction are listed and their effect on Cassandra’s performance has been tested using some experiments. Based on these experiments, few sub-optimum values are proposed for the listed metrics. Conclusions. It can be concluded that, for better performance of Dockerized Cassandra, the proposed values for each of the parameters in the results (i.e. 5120 for Memtable_heap_size_in_mb, 24 for concurrent_compactors, 16 for compaction_throughput_mb_per_sec, 6 for Memtable_flush_writers and 0.14 for Memtable_cleaup _threshold) can be chosen separately but not the union of those proposed values (confirmed from the experiment performed). Also the metrics and parameters affecting Cassandra performance are listed in this thesis.
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2

Fredenburg, David Anthony. "Shock compaction and impact response of thermite powder mixtures." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37130.

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This dissertation focuses on developing a predictive method for determining the dynamic densification behavior of thermite powder mixtures consisting of equivolumetric mixtures of Ta + Fe₂O₃ and Ta + Bi₂O₃. Of primary importance to these highly reactive powder mixtures is the ability to characterize the stress at which full compaction occurs, the crush strength, which can significantly influence the stress required to initiate reaction during dynamic or impact loading. Examined specifically are the quasi-static and dynamic compaction responses of these mixtures. Experimentally obtained compaction responses in the quasi-static regime are analyzed using available compaction models, and an analysis technique is developed that allows for a correct measurement of the apparent yield strength of the powder mixtures. The correctly determined apparent yield strength is combined with an equation of state to yield a prediction of the shock densification response, including the dynamic crush strength of the thermite powder mixtures. The validated approach is also extended to the Al + Fe₂O₃ thermite system. It is found that accurate predictions of the crush strength can be obtained through determination of the apparent yield strength of the powder mixture when incorporated into the equation of state. It is observed that the predictive ability in the incomplete compaction region is configurationally dependent for highly heterogeneous thermite powder systems, which is in turn influenced by particle morphology and differences in intrinsic properties of constituents (density, strength, etc.).
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3

Burlion, Nicolas. "Compaction des bétons : éléments de modélisation et caractérisation expérimentale." Cachan, Ecole normale supérieure, 1997. http://www.theses.fr/1997DENS0021.

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Анотація:
La compaction des bétons se rencontre le plus souvent dans le cas de choc ou d'impact sur structure en béton. Sous l'effet de fortes sollicitations de compression triaxiales, le matériau béton, initialement poreux, se densifie par réduction de la porosité initiale. L'énergie dissipée au cours de cette densification est tres importante : le matériau est fortement plastifie et endommage. Au cours d'un impact, d'autres phénomènes entrent en jeu : du cisaillement provoque par la perforation du missile, et de l'écaillage provoque par réflexion des ondes de compression sur la face non-impactée en ondes de traction. Nous proposons dans la première partie de cette thèse une modélisation de ces phénomènes basée sur la mécanique des milieux poreux, la mécanique de l'endommagement et la plasticité. Le modèle phénoménologique que nous proposons est apte à représenter les divers phénomènes physiques qui interviennent au cours d'un impact. Les comportements obtenus tant en traction qu'en compaction sont comparables avec des résultats expérimentaux. De plus le modèle propose à des propriétés de régularisation intéressantes en vue de calculs numériques par éléments finis. Dans une deuxième partie, nous proposons une stratégie expérimentale en vue de caractériser la compaction de bétons et de mortiers. Ce processus expérimental s'appuie sur deux essais statiques de compaction. Le premier de ces essais est dénommé essai uniaxial confine. Le principe de cet essai est de solliciter axialement une éprouvette cylindrique ayant un diamètre de 5 cm pour une hauteur de 10 cm, et d'empêcher son gonflement radial par une cellule cylindrique métallique de forte épaisseur. Les sollicitations maximales de compression atteintes sont alors de 1275 mpa axialement sur l'éprouvette pour une contrainte radiale de 260 mpa environ. Cet essai permet de caractériser la compaction de béton sur un trajet oedometrique. Le deuxième essai est dénommé essai triaxial hydrostatique : il résulte de l'adaptation aux matériaux très poreux d'une cellule a confinement fluide mis au point pour les matériaux métalliques. Les éprouvettes testées sont alors des mortiers et des micro-bétons. La sollicitation maximale atteinte est une pression hydrostatique de 400 mpa. Cet essai permet de caractériser des mortiers sur un trajet hydrostatique.
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4

Szappanos-Csordas, Kitti [Verfasser], Peter [Gutachter] Kleinebudde, and Jörg [Gutachter] Breitkreutz. "Impact of material properties, process parameters and roll compactor design on roll compaction / Kitti Szappanos-Csordas ; Gutachter: Peter Kleinebudde, Jörg Breitkreutz." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2019. http://d-nb.info/1200634047/34.

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5

Bodard, Sébastien. "Expérimentations et approche numérique de la transition combustion-déflagration-détonation dans les milieux pulvérulents initiée par un impact à faible vitesse." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4743/document.

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Анотація:
La présente thèse se concentre tout d'abord à mettre en place des expérimentations de compaction dynamique de poudres.Un montage expérimentale est conçu, testé puis validé. Le but de ce dernier est de générer des ondes de compaction unidimensionnelles et de pouvoir observer le milieu granulaire à l'échelle des grains. Deux types de poudres sont considérés : une poudre de polypropylène et une poudre d'explosif (RDX).Pour cela, des caméras ultra-rapides (50 000 images/s) sont utilisée pour enregistrer les essais. Une technique de corrélation d'image est utilisée pour remonter aux champs de déplacement et de vitesse des grains.Un modèle de compaction multiphasique est implémenté. Les phénomènes de friction grain/paroi sont ajoutés au modèle suite aux observation expérimentale. Une partie du travail a été consacré à l'amélioration de l'équation d'état granulaire et à sa détermination expérimentale.Les résultats numériques sont en bon accord avec les expérimentations, tant que le montage expérimental ne se déforme pas sous l'effet de la pression des grains.De premières expérimentations avec les poudres d'explosifs ont été réalisées. Le montage expérimental nécessite encore certaines améliorations mais il a prouvé son utilité dans l'étude de la transition combustion-déflagration-détonation
The first part of the present PhD focuses on the conception and the validation of an experimental set up. The aim of the experiments is to generate one-dimensional compaction waves and to observe the media at the grains scale. Two type of powder are used : polypropylene powder and an explosive powder (RDX).The experimental apparatus uses ultra-fast cameras (50 000 images/s) to record the tests. Image correlation is used to compute the displacement and velocity fields.A multiphasic compaction model is then coded. Grain/wall friction is added as the experimental work underlined its importance. Additional work has been provided concerning the granular equation of state and its experimental determination.Numerical results are in good agreement with the experimenations, as long as the experimental set up is not deformed because of the grains' pressure.A few experiments have been done with explosive powders. The experimental set up still needs some improvement but it proved its usefullness for deflagration to detonation studies
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6

Kachamba, Daud Jones. "Impact of harvesting machinery on soil physical parameters : evaluation of ProFor model in three main forestry regions of South Africa /." Link to the online version, 2007. http://hdl.handle.net/10019/648.

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7

Battigelli, Jeffrey Paul. "Impact of soil compaction and organic matter removal on soil fauna in the sub-boreal spruce zone of central British Columbia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0012/NQ59563.pdf.

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8

Pérez, Gago Ana [Verfasser], and Peter [Akademischer Betreuer] Kleinebudde. "Roll Compaction Scale-Up: Impact of Material, Effect of Scale and Modelling of The Process Transfer / Ana Pérez Gago ; Betreuer: Peter Kleinebudde." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2017. http://d-nb.info/1129357279/34.

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9

Hadebe, G. P., and der Westhuizen C. Van. "The impact of soil compaction on the vegetative growth of carrots (Daucus carota, var. Sativas) planted in loosened and unloosened soil in the Eastern Free State." Interim : Interdisciplinary Journal, Vol 4, Issue 2: Central University of Technology, Free State, Bloemfontein, 2005. http://hdl.handle.net/11462/438.

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Published Article
This study focuses on trials conducted on plots in the Leratong and Mpho vegetable gardens in the Eastern Free State. The aim was to investigate the possible impact of soil compaction on the growth of carrots planted on loosened (treated) and unloosened (untreated) soil. Aspects such as sprouting, vegetative length after 14 days of sprouting and diameter, as well as the length and mass of carrots after harvesting, were observed and compared between the treated and untreated carrot plots. Although there was no significant (P>0.05) difference between the two soil management practices applied in all locations, as well as the vegetative growth in the locations, a significant (P<0.05) difference between the length of carrots from the treated and the untreated plots was observed.
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10

Kleppan, Danielle R. "Beach Compaction Impact on Nesting Success of Loggerhead (Caretta caretta) Sea Turtles: A Comparison Between a Natural and Renourished Beach in Northern Broward County, Florida." NSUWorks, 2013. http://nsuworks.nova.edu/occ_stuetd/162.

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Анотація:
The beaches of Broward County, Florida are a prevalent nesting site for loggerhead (Caretta caretta) sea turtles, however extensive beach erosion is threatening critical nesting habitat. Beach renourishment, the process of transporting offshore or upland sediment onshore, is a widely used method of replenishing lost sand. However, renourishment can negatively affect sea turtle nesting habitat by increasing beach compaction; the resistance to applied pressure in pounds per square inch (psi). Increased sand compaction impedes the digging of the female which affects nesting success. The influence of beach compaction on sea turtle nesting patterns has never been previously examined over the course of a nesting season on Hillsboro and Deerfield Beach. Therefore, this study was designed to examine beach compaction data for Hillsboro, a mostly natural beach, and Deerfield, a completely renourished beach, during the 2010 nesting season and analyze the compaction data against 2010 nest and false crawl (FC, non-nesting emergence) data. Compaction readings were collected during every other week March-October using a soil compaction meter at every other street address along three beach positions, the dune base, mid-beach, and average high tide line (HTL); and at three depths, 15 cm, 30 cm, and 45 cm. Values were not statistically different throughout the season for each beach, so seasonal mean compaction values were used for each beach position and depth. Hillsboro compaction values were rarely over 500 psi (35 kg/cm2), even at 45 cm depth. Deerfield compaction values exceeded the 600 psi (42kg/cm2) measurement limit of the meter in approximately 60% of the compaction values at 30 cm or 45 cm depth. Sand compaction data was analyzed for any trends between beaches as well as within each beach. Historical data shows higher loggerhead nesting success, the number of nests/total number of crawls (including FC) x 100, on Hillsboro Beach than on Deerfield Beach. The average beach compaction values were compared to nesting success and to nest and FC density within each station area. There was a significant inverse relationship (p<0.05) between beach compaction and nesting success at each of the beach positions and depths, when both Hillsboro and Deerfield Beaches were analyzed together, except at the Mid 30 cm and Dune 45 cm depth. The strongest relationship for the combined beaches was at the HTL 15 cm depth (R2=0.3821, p<0.001). When Hillsboro was analyzed alone, beach compaction and nesting success was only significantly inversely related (R2=0.0875, p<0.02) at the HTL 15 cm depth. This demonstrates that while increased beach compaction may partially influence nesting success, there are likely other beach characteristics that contribute to nest site selection of loggerheads in Northern Broward County. The inverse relationship between Hillsboro mean beach compaction and nest density (nests per meter) was significant only at the HTL 15cm depth (p<0.002) and the inverse relationship between mean beach compaction and false crawl density (FC per meter) in Hillsboro was only significant at the Dune 15 cm (p<0.019) and the Dune 30 cm (p<0.038) depths. Although, increased beach compaction was expected to relate to higher FC density, FC density showed a significant inverse relationship to mean beach compaction at all Deerfield Beach positions and depths in and this suggests off-shore factors may be affecting nest site selection.
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Книги з теми "Impact compaction"

1

White, Robert E. Understanding Vineyard Soils. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780199342068.001.0001.

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The first edition of Understanding Vineyard Soils has been praised for its comprehensive coverage of soil topics relevant to viticulture. However, the industry is dynamic--new developments are occurring, especially with respect to measuring soil variability, managing soil water, possible effects of climate change, rootstock breeding and selection, monitoring sustainability, and improving grape quality and the "typicity" of wines. All this is embodied in an increased focus on the terroir or "sense of place" of vineyard sites, with greater emphasis being placed on wine quality relative to quantity in an increasingly competitive world market. The promotion of organic and biodynamic practices has raised a general awareness of "soil health", which is often associated with a soil's biology, but which to be properly assessed must be focused on a soil's physical, chemical, and biological properties. This edition of White's influential book presents the latest updates on these and other developments in soil management in vineyards. With a minimum of scientific jargon, Understanding Vineyard Soils explains the interaction between soils on a variety of parent materials around the world and grapevine growth and wine typicity. The essential chemical and physical processes involving nutrients, water, oxygen and carbon dioxide, moderated by the activities of soil organisms, are discussed. Methods are proposed for alleviating adverse conditions such as soil acidity, sodicity, compaction, poor drainage, and salinity. The pros and cons of organic viticulture are debated, as are the possible effects of climate change. The author explains how sustainable wine production requires winegrowers to take care of the soil and minimize their impact on the environment. This book is a practical guide for winegrowers and the lay reader who is seeking general information about soils, but who may also wish to pursue in more depth the influence of different soil types on vine performance and wine character.
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Частини книг з теми "Impact compaction"

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Liu, Qian, Jin-Gang Wang, Gen-Qun Cui, Yi-Min Wu, and Zhi-Ge Zhou. "Analysis of Compaction Process between Impact Compacting Machine and Roadbed." In Perspectives from Europe and Asia on Engineering Design and Manufacture, 743–51. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2212-8_72.

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Hoefer, Gunnar, and Karl Heinrich Hartge. "Subsoil Compaction: Cause, Impact, Detection, and Prevention." In Soil Biology, 121–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03681-1_9.

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Aman, Sergej, Alexander Aman, and Werner Hintz. "Microwave Emission During the Impact Compaction of Particle Bed." In Particles in Contact, 67–87. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-15899-6_3.

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Zhou, Xiaodong, Yu Liu, and Zhanping You. "Heavy Impact Compaction Modeling and Analysis on Unbound Paving Mixtures." In Springer Proceedings in Physics, 437–44. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1926-5_46.

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Strydom, J. H. "Impact compaction trials: Assessment of depth and degree of improvement and methods of integrity testing." In Geotechnics for Developing Africa, 603–11. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003211174-83.

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Galanov, B. A., V. V. Kartuzov, S. M. Ivanov, and A. A. Pryadko. "Evaluation of Temperature Jump at the Front of Comminution and Compaction of the Ceramic Target Material at High-Velocity Impact." In Proceedings of the 41st International Conference on Advanced Ceramics and Composites, 165–74. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119474678.ch16.

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Ghanem, Hassan, Yehia Obeid, Ayman Trad, and Mohamed Dandachy. "The Impact of Steel Fibers on the Properties of Self Compacting Concrete." In Advances and Challenges in Structural Engineering, 138–50. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01932-7_12.

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Spangenberg, J., N. Roussel, J. H. Hattel, J. Thorborg, M. R. Geiker, H. Stang, and J. Skocek. "Prediction of the Impact of Flow-Induced Inhomogeneities in Self-Compacting Concrete (SCC)." In Design, Production and Placement of Self-Consolidating Concrete, 209–15. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9664-7_18.

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AL-Kaissi, Zainab A., Ahmed S. D. Al-Ridha, and Rusul Raed Abdull-Hussain. "Impact Load Test on Conventional and Roller Compactor Steel Fiber Reinforced Concrete Pavement." In Materials for Sustainable Infrastructure, 96–120. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-61633-9_7.

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Van Der Vurst, Farid, Steffen Grünewald, and Geert De Schutter. "The Impact of VMA on the Rheology, Thixotropy and Robustness of Self-compacting Mortars." In RILEM Bookseries, 159–67. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9939-3_20.

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Тези доповідей конференцій з теми "Impact compaction"

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Waddell, P. J., R. A. Moyle, and R. J. Whiteley. "Geotechnical verification of impact compaction." In BROWNFIELDS 2010. Southampton, UK: WIT Press, 2010. http://dx.doi.org/10.2495/bf100071.

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Simpson, Lori A., Serena T. Jang, Cary E. Ronan, and Lisa M. Splitter. "Liquefaction Potential Mitigation Using Rapid Impact Compaction." In Geotechnical Earthquake Engineering and Soil Dynamics Congress IV. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/40975(318)110.

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Mohammed, Wessam, and Andrea L. Welker. "Impact of Soil Compaction on Vegetated Basin Transition." In Geo-Congress 2020. Reston, VA: American Society of Civil Engineers, 2020. http://dx.doi.org/10.1061/9780784482803.028.

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Grady, Dennis. "Statistics of energy dissipation in the hypervelocity impact shock failure transition." In 2019 15th Hypervelocity Impact Symposium. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/hvis2019-020.

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Abstract In the hypervelocity impact event, shock waves subject material to failure transitions with the attendant dissipation of the imparted energy. Under shock compression, failure and dissipation entail intense compression, inelastic shear and compaction. Through shock interactions, states of dynamic tension are achieved and further failure dissipation involves fracture and fragmentation. The nature of failure of solids in the shock environment has encouraged considerable experimental effort through the past several decades. Such efforts have yielded results that suggest universality in the shock failure response over significant spans of shock intensity. Examples include the fourth-power relation between pressure and strain rate in solid-material compressive shock waves, and power-law relations capturing spall fracture strength and fragmentation size scale in dynamic tensile failure. Comparable power-laws also describe the shock compaction of distended solids. The present paper explores a statistical perspective of the underlying micro failure dynamics for the purpose of achieving better understanding of the macro failure trends noted above. A statistical correlation function description of the random micro velocity field is introduced. Through the attendant kinetic dissipation, the statistical fluctuation-dissipation principle is applied to the shock failure transition. From this statistical approach, power-law relations for compressive and tensile shock failure emerge that replicate the reported experimental behaviors.
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Sileshi, Redahegn, Robert Pitt, and Shirley Clark. "Impacts of Soil Texture, Structure, and Compaction on Bioinfiltration Device Performance: Results of Lab and Field Investigations." In 2011 Low Impact Development Conference. Reston, VA: American Society of Civil Engineers, 2015. http://dx.doi.org/10.1061/9780784413883.002.

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Khaled, Omar El, Emmanouil Spyropoulos, and Omar Maalej. "Vibration Induced By Rapid Impact Compaction on Granular Soils." In The 5th International Conference on Civil, Structural and Transportation Engineering. Avestia Publishing, 2020. http://dx.doi.org/10.11159/iccste20.272.

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Pathak, Prabodh, Sri Intan Wirya, Mark A. Catanzano, David Prickett, and Dickson Tomuan Mangunsong. "Impact Of Rock Compaction On NSO Gas Field Performance." In International Petroleum Technology Conference. International Petroleum Technology Conference, 2007. http://dx.doi.org/10.2523/iptc-11238-ms.

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Pathak, P., S. I. Wirya, M. Catanzano, H. D. Prickett, and D. T. M. Mangunsong. "Impact of Rock Compaction on NSO Gas Field Performance." In IPTC 2007: International Petroleum Technology Conference. European Association of Geoscientists & Engineers, 2007. http://dx.doi.org/10.3997/2214-4609-pdb.147.iptc11238.

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Chen, Zhong-qing, Chao Xu, Guan-bao Ye, and Chao Shen. "Impact Roller Compaction of Dry Sand in Laboratory Tests." In Geo-Shanghai 2014. Reston, VA: American Society of Civil Engineers, 2014. http://dx.doi.org/10.1061/9780784413401.026.

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Pathak, Prabodh, Sri Intan Wirya, Mark A. Catanzano, David Prickett, and Dickson Tomuan Mangunsong. "Impact Of Rock Compaction On NSO Gas Field Performance." In International Petroleum Technology Conference. International Petroleum Technology Conference, 2007. http://dx.doi.org/10.2523/11238-ms.

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Звіти організацій з теми "Impact compaction"

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Rahman, Shahedur, Rodrigo Salgado, Monica Prezzi, and Peter J. Becker. Improvement of Stiffness and Strength of Backfill Soils Through Optimization of Compaction Procedures and Specifications. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317134.

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Vibration compaction is the most effective way of compacting coarse-grained materials. The effects of vibration frequency and amplitude on the compaction density of different backfill materials commonly used by INDOT (No. 4 natural sand, No. 24 stone sand, and No. 5, No. 8, No. 43 aggregates) were studied in this research. The test materials were characterized based on the particle sizes and morphology parameters using digital image analysis technique. Small-scale laboratory compaction tests were carried out with variable frequency and amplitude of vibrations using vibratory hammer and vibratory table. The results show an increase in density with the increase in amplitude and frequency of vibration. However, the increase in density with the increase in amplitude of vibration is more pronounced for the coarse aggregates than for the sands. A comparison of the maximum dry densities of different test materials shows that the dry densities obtained after compaction using the vibratory hammer are greater than those obtained after compaction using the vibratory table when both tools were used at the highest amplitude and frequency of vibration available. Large-scale vibratory roller compaction tests were performed in the field for No. 30 backfill soil to observe the effect of vibration frequency and number of passes on the compaction density. Accelerometer sensors were attached to the roller drum (Caterpillar, model CS56B) to measure the frequency of vibration for the two different vibration settings available to the roller. For this roller and soil tested, the results show that the higher vibration setting is more effective. Direct shear tests and direct interface shear tests were performed to study the impact of particle characteristics of the coarse-grained backfill materials on interface shear resistance. The more angular the particles, the greater the shear resistance measured in the direct shear tests. A unique relationship was found between the normalized surface roughness and the ratio of critical-state interface friction angle between sand-gravel mixture with steel to the internal critical-state friction angle of the sand-gravel mixture.
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Mazari, Mehran, Siavash F. Aval, Siddharth M. Satani, David Corona, and Joshua Garrido. Developing Guidelines for Assessing the Effectiveness of Intelligent Compaction Technology. Mineta Transportation Institute, January 2021. http://dx.doi.org/10.31979/mti.2021.1923.

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Many factors affect pavement compaction quality, which can vary. Such variability may result in an additional number of passes required, extended working hours, higher energy consumption, and negative environmental impacts. The use of Intelligent Compaction (IC) technology during construction can improve the quality and longevity of pavement structures while reducing risk for contractors and project owners alike. This study develops guidelines for the implementation of IC in the compaction of pavement layers as well as performing a preliminary life-cycle cost analysis (LCCA) of IC technology compared to the conventional compaction approach. The environmental impacts of the improved construction process were quantified based on limited data available from the case studies. The LCCA performed in this study consisted of different scenarios in which the number of operating hours was evaluated to estimate the cost efficiency of the intelligent compaction technique during construction. The analyses showed a reduction in energy consumption and the production of greenhouse gas (GHG) emissions with the use of intelligent compaction. The LCCA showed that the use of IC technology may reduce the construction and maintenance costs in addition to enhancing the quality control and quality assurance (QC/QA) process. However, a more comprehensive analysis is required to fully quantify the benefits and establish more accurate performance indicators. A draft version of the preliminary guidelines for implementation of IC technology and long-term monitoring of the performance of pavement layers compacted thereby is also included in this report.
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Reine, Kevin. A literature review of beach nourishment impacts on marine turtles. Engineer Research and Development Center (U.S.), March 2022. http://dx.doi.org/10.21079/11681/43829.

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This Technical Report was developed by the U. S. Army Engineer Research and Development Center-Environmental Laboratory (ERDC-EL), to summarize the known impacts to nesting sea turtles along the Atlantic and Gulf Coasts resulting from beach nourishment. The U.S. Army Corps of Engineers (USACE) is responsible for maintaining the nation’s infrastructure to include ports and harbors through dredging of Federal navigation channels as well as shoreline stabilization. Shoreline stabilization through beach nourishment activities can provide opportunities for reductions in storm surge, flood control, and provide opportunities for residential growth, recreational activities, and coastal habitat restoration (Guilfoyle et al. 2019). Beach nourishment is an effective method for protection and enhancement of coastal development projects but may have detrimental impacts on marine life (e.g., nesting sea turtles and shorebirds). The objective of this Technical Report is to examine all elements of the beach nourishment process to include, active beach construction, entrainment of marine turtles in hopper dredges, beach protection and hard structures, beach profile features, compaction and shear resistance, artificial lighting, marine turtle nest relocation, and nesting habitat factors. Recommendations for mitigating and minimizing these impacts are provided.
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