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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

A laboratory investigation into the stabilization of natural soils using two waste materials

Barrett, Andrew John 04 December 2014 (has links)
A Dissertation Submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in partial fulfillment for the Degree of Master of Science in Engineering. Johannesburg, 1979. / Soil stabilization is the generic term for any process which has as its aim the upgrading or improvement of one or more soil properties. In South Africa, stabilization is usually effected using a combination of mechanical densification and the addition of a binder to the soil. Two waste materials, PFA (a power station waste) and phosphogypsum (a waste from the fertilizer industry) have been shown to be useful binders overseas. The purpose of this project was to investigate local samples of these waste materials to establish their potential as soil stabilizers. A limited amount of research into the use of these two materials has been carried out in South Africa. The results of these programmes are discussed. Generally, however, none of these programmes were comprehensive enough to reach categoric conclusions regarding either binder. The soils used in the investigation were taken from various locations in the Johannesburg Municipal area in which it is intended to construct surfaced roads for light traffic in the near future. The soils chosen cover a range of plasticity indices from 0 to 30, but unfortunately, were very similar mineralogically. The phosphogypsum used was supplied by Triomf Fertilizer (Pty) Limited. Two samples of PFA were used. One of them was supplied by Darling and Hodgson, Limited, who are extracting a "selected" ash from Grootvlei power station, and intend to make it commercially available at some stage. The other ash was obtained from Kelvin power station. Tests were done to establish both the short and long term effects of the binders on the soils. The short term effects were investigated by looking at changes in the plasticity and moisture density relationships for the soils immediately after the addition of the binders. The long term effects were investigated by looking at the changes in unconfined compressive strength of moulded soil samples with the addition of the binders. (Samples were moulded at 100% Mod AASHO density and optimum moisture content in a tapered cylindrical mould by static compaction). These effects were looked at from 3 different angles. i) the effect of binder composition (i.e. different ratios of PFA/lime and PFA/cement) ii) the effect of binder content iii) the effect of age on strength gain The results of the testing programme were not very encouraging. For the binder contents used, there were minimum short term effects for both binder types. The addition of phosphogypsum to the soils resulted in only very small strength increases. For the PFA binders, it appears that the lime content of many of the PFA/lime binders fell in a range where only short term reactions could be expected. However, even where sufficient lime was present to satisfy the initial lime demand of the soil, the PFA appeared to act mainly as a diluent to the lime. Similar conclusions apply to the PFA/cement binders. The general nature of PFA/lime stabilization was uncovered in this testing programme, but further tests will have conducted before conclusions regarding the quality of our local materials can be drawn.
2

Soil pressure distribution on buried structures

Fernandez-Salido, Pedro, 1940- January 1966 (has links)
No description available.
3

Soil stabilization with powdered and coarse quicklime

Allanach, William Cummings, 1941- January 1974 (has links)
No description available.
4

Evaluation of strength properties of several soils treated with various admixtures

McGee, James Davis 12 1900 (has links)
No description available.
5

A laboratory investigation of the efficiency of different methods of soil compaction

Kennedy, Clyde Marion 08 1900 (has links)
No description available.
6

A study of the lateral pressures induced in a soil due to compaction under confined conditions

Robb, Andrew Dewar 08 1900 (has links)
No description available.
7

Traitment du sol contre la compaction des terrains de golf.

Laflamme, Gaëtan. January 1971 (has links)
No description available.
8

At-rest and compaction-induced lateral earth pressures of moist soils /

Ishihara, Katsuji, January 1993 (has links)
Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1993. / Vita. Abstract. Includes bibliographical references (leaves 249-257). Also available via the Internet.
9

Stabilization policy in an open economy a simulation approach with a rational learning rule /

Symansky, Steven A. January 1980 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1980. / Typescript. Vita. Description based on print version record. Includes bibliographical references (leaves 328-339).
10

Market structure and the stability of prices, output, and employment

Garber, Steven Glenn, January 1976 (has links)
Thesis--Wisconsin. / Vita. Includes bibliographical references (leaves 153-157).

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