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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

The design, installation and operation of a crushing plant

McDonald, John Harry 06 1900 (has links)
No description available.
2

Crushed stone fines and ion removal from clay slurries-fundamental studies

Guimaraes, María 05 1900 (has links)
No description available.
3

The rutting characteristics of crushed stone

Jackson, Charles Mayo 12 1900 (has links)
No description available.
4

Residual effects of crushing stone on dry-matter yields and uptake of K, Mg and Ca by corn (Zea mays L.)

Arriaga, Luis R. January 1984 (has links)
No description available.
5

Residual effects of crushing stone on dry-matter yields and uptake of K, Mg and Ca by corn (Zea mays L.)

Arriaga, Luis R. January 1984 (has links)
No description available.
6

Comportamento da areia de britagem de rocha calcária na argamassa de revestimento / Behavior of limestone sand crushing sand in coating mortar

Tokarski, Rosângela Basso 27 March 2017 (has links)
O objetivo desse trabalho é identificar o comportamento da areia de britagem de rocha calcária na argamassa de revestimento Foram propostas cinco composições de traço, a primeira com 100% areia natural, que será usado como traço de referência, a segunda composição com 80% areia natural, e 20% areia de britagem de rocha calcária, o terceiro com 60% areia natural e 40% areia de britagem de rocha calcária, o quarto com 40% areia natural e 60% areia de britagem de rocha calcária, e o quinto com 20% areia natural e 80% areia de britagem de rocha calcária. Os traços das argamassas foram compostos com cimento, areia, água e aditivo, sem a presença da cal, e estas foram ensaiadas no estado fresco e endurecido e apresentaram os seguintes resultados: Os traços compostos com a areia de britagem de rocha calcária apresentaram melhor desempenho que o traço de referência, composto apenas com areia natural. O traço com 60% de areia natural e 40% de areia de britagem de rocha calcária apresentou melhor desempenho em 70% dos ensaios realizados, tendo apresentado uma curva granulométrica dentro da zona ótima superior e inferior exigido pela norma. A relevância desse estudo se deve ao fato de que, a areia de britagem é um resíduo que gera um importante passivo ambiental, e o uso da areia de extração provoca a degradação do meio ambiente. Utilizar a areia de britagem para substituir a areia natural é uma forma de contribuir para a preservação ecológica. / The goal of this resarch is to identify the behavior of limestone crushed sand in coating mortar. Five trace compositions were proposed and tested: the first one made up of 100% natural sand, which will be used as reference trace, the second composition presented 80% natural sand and 20% limestone rock crushed sand, the third one 60% natural sand and 40% limestone rock crushed sand, the fourth one with 40% natural sand and 60% limestone rock crushed sand, and the fifth trace 20 % natural sand and 80% limestone rock crushed sand. The mortar traces were composed of cement, sand, water and additive, without the presence of lime, and these were tested in the wet and hardened state and presented the following results: Composite traces with limestone rock crushed sand presented better performance than the reference trace, which had only natural sand. The traces with 60% natural sand and 40% limestone crushed sand showed better performance in 70% of the tests performed, and presented a grain size curve within the optimal upper and lower zone, as required by the standard rules. The relevance of this study is due to the fact that crushed sand is a waste that generates important environmental liability, and natural sand extraction leads to the environmental degradation. Using crushed sand to replace natural sand is one way to contribute to environmental preservation.
7

Comportamento da areia de britagem de rocha calcária na argamassa de revestimento / Behavior of limestone sand crushing sand in coating mortar

Tokarski, Rosângela Basso 27 March 2017 (has links)
O objetivo desse trabalho é identificar o comportamento da areia de britagem de rocha calcária na argamassa de revestimento Foram propostas cinco composições de traço, a primeira com 100% areia natural, que será usado como traço de referência, a segunda composição com 80% areia natural, e 20% areia de britagem de rocha calcária, o terceiro com 60% areia natural e 40% areia de britagem de rocha calcária, o quarto com 40% areia natural e 60% areia de britagem de rocha calcária, e o quinto com 20% areia natural e 80% areia de britagem de rocha calcária. Os traços das argamassas foram compostos com cimento, areia, água e aditivo, sem a presença da cal, e estas foram ensaiadas no estado fresco e endurecido e apresentaram os seguintes resultados: Os traços compostos com a areia de britagem de rocha calcária apresentaram melhor desempenho que o traço de referência, composto apenas com areia natural. O traço com 60% de areia natural e 40% de areia de britagem de rocha calcária apresentou melhor desempenho em 70% dos ensaios realizados, tendo apresentado uma curva granulométrica dentro da zona ótima superior e inferior exigido pela norma. A relevância desse estudo se deve ao fato de que, a areia de britagem é um resíduo que gera um importante passivo ambiental, e o uso da areia de extração provoca a degradação do meio ambiente. Utilizar a areia de britagem para substituir a areia natural é uma forma de contribuir para a preservação ecológica. / The goal of this resarch is to identify the behavior of limestone crushed sand in coating mortar. Five trace compositions were proposed and tested: the first one made up of 100% natural sand, which will be used as reference trace, the second composition presented 80% natural sand and 20% limestone rock crushed sand, the third one 60% natural sand and 40% limestone rock crushed sand, the fourth one with 40% natural sand and 60% limestone rock crushed sand, and the fifth trace 20 % natural sand and 80% limestone rock crushed sand. The mortar traces were composed of cement, sand, water and additive, without the presence of lime, and these were tested in the wet and hardened state and presented the following results: Composite traces with limestone rock crushed sand presented better performance than the reference trace, which had only natural sand. The traces with 60% natural sand and 40% limestone crushed sand showed better performance in 70% of the tests performed, and presented a grain size curve within the optimal upper and lower zone, as required by the standard rules. The relevance of this study is due to the fact that crushed sand is a waste that generates important environmental liability, and natural sand extraction leads to the environmental degradation. Using crushed sand to replace natural sand is one way to contribute to environmental preservation.
8

Development of an integrated approach of dealing with challenges of selected small-scale rock aggregate mines in Vhembe District, Limpopo Province, South Africa

Rembuluwani, Ndivhudzanyi 05 1900 (has links)
MESMEG / Department of Mining and Environmental Geology / See the attached abstract below

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