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Evaluation of letsoku and related Southern African indigenous clayey soils
Thesis (PhD)--University of Pretoria, 2017.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2018
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| _version_ | 1867613694652841984 |
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| access_status_str | Open Access |
| author2 | Focke, Walter Wilhelm |
| author_browse | Focke, Walter Wilhelm |
| author_facet | Focke, Walter Wilhelm |
| collection | Thesis |
| dc_rights_str_mv | © 2018 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Thesis (PhD)--University of Pretoria, 2017. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/67817 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:40:13.301Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/67817 Evaluation of letsoku and related Southern African indigenous clayey soils Focke, Walter Wilhelm u96276313@tuks.co.za Morekhure-Mphahlele, Refilwe Unrestricted UCTD Clayey soil Traditional knowledge Letsoku Composition Clay minerals Engineering, built environment and information technology theses SDG-04 Engineering, built environment and information technology theses SDG-08 Engineering, built environment and information technology theses SDG-11 Engineering, built environment and information technology theses SDG-12 Engineering, built environment and information technology theses SDG-15 Thesis (PhD)--University of Pretoria, 2017. The nature of letsoku and related clayey soils, traditionally used by indigenous Southern African communities for a wide range of purposes, was explored. Thirty-nine samples were collected from Botswana, Lesotho, Swaziland, South Africa and Zimbabwe. They were analysed to determine their composition and physical properties. Structured interviews were used to establish the purpose of use and the location of sourcing sites. The samples were in the form of either powder or rocks, and some were supplied as dry rolled clay balls. Cosmetic applications were almost universally indicated. However, other functions, related to artwork, medicinal use, cultural symbolism and traditional beliefs, were also mentioned. The samples covered a wide range of colours from bright red to yellow, but also from off-white to black, with some having a light grey colour. It was therefore not surprising that the mineral composition of the letsoku samples also varied widely. A black sample, and the yellow and reddish pastel-coloured samples, contained significant quantities of the corresponding, colourimparting iron oxides. Clay minerals featured prominently, although kaolinite and muscovite were more often encountered as the dominant minerals than smectites. All the samples contained silica and in some instances the content exceeded 90 % m/m SiO2. The presence of high contents (more than 40 % m/m) of gibbsite in the samples from Venda represents a new finding for clayey soils in traditional usage. mi2026 Chemical Engineering PhD Unrestricted SDG-04: Quality education SDG-08: Decent work and economic growth SDG-11: Sustainable cities and communities SDG-12: Responsible consumption and production SDG-15: Life on land 2018-12-05T08:05:04Z 2018-12-05T08:05:04Z 2009/05/18 2017 Thesis Mphahlele, R 2017, Evaluation of letsoku and related Southern African indigenous clayey soils, PhD Thesis, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/67817> S2018 http://hdl.handle.net/2263/67817 en © 2018 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Unrestricted UCTD Clayey soil Traditional knowledge Letsoku Composition Clay minerals Engineering, built environment and information technology theses SDG-04 Engineering, built environment and information technology theses SDG-08 Engineering, built environment and information technology theses SDG-11 Engineering, built environment and information technology theses SDG-12 Engineering, built environment and information technology theses SDG-15 Evaluation of letsoku and related Southern African indigenous clayey soils |
| title | Evaluation of letsoku and related Southern African indigenous clayey soils |
| title_full | Evaluation of letsoku and related Southern African indigenous clayey soils |
| title_fullStr | Evaluation of letsoku and related Southern African indigenous clayey soils |
| title_full_unstemmed | Evaluation of letsoku and related Southern African indigenous clayey soils |
| title_short | Evaluation of letsoku and related Southern African indigenous clayey soils |
| title_sort | evaluation of letsoku and related southern african indigenous clayey soils |
| topic | Unrestricted UCTD Clayey soil Traditional knowledge Letsoku Composition Clay minerals Engineering, built environment and information technology theses SDG-04 Engineering, built environment and information technology theses SDG-08 Engineering, built environment and information technology theses SDG-11 Engineering, built environment and information technology theses SDG-12 Engineering, built environment and information technology theses SDG-15 |
| url | http://hdl.handle.net/2263/67817 |