Repository logo
  • English
  • Català
  • ÄŒeÅ¡tina
  • Deutsch
  • Español
  • Français
  • Gàidhlig
  • Italiano
  • LatvieÅ¡u
  • Magyar
  • Nederlands
  • Polski
  • Português
  • Português do Brasil
  • Srpski (lat)
  • Suomi
  • Svenska
  • Türkçe
  • Tiếng Việt
  • Log In
    New user? Click here to register. Have you forgotten your password?
Repository logo
    Communities & Collections
    All of DSpace
  • English
  • Català
  • ÄŒeÅ¡tina
  • Deutsch
  • Español
  • Français
  • Gàidhlig
  • Italiano
  • LatvieÅ¡u
  • Magyar
  • Nederlands
  • Polski
  • Português
  • Português do Brasil
  • Srpski (lat)
  • Suomi
  • Svenska
  • Türkçe
  • Tiếng Việt
  • Log In
    New user? Click here to register. Have you forgotten your password?
  1. Home
  2. Browse by Author

Browsing by Author "Ngalu, Robert"

Now showing 1 - 1 of 1
Results Per Page
Sort Options
  • No Thumbnail Available
    Item
    Suitability of lime-pozzolan in stabilizing laterite soil for rural roads construction in Tanzania
    (University of Dar es Salaam, 2006) Ngalu, Robert
    Discovery of large quantity of locally available pozzolan in Arusha, Mbeya and Kilimanjaro regions, which possess good amount of reactive silica led to further study on their suitability in stabilizing late rite soil which is one of the marginal and problem soil materials used in road construction in Tanzania. Three types of late rite soils categorized by origin, location and particle size were investigated. These soils were in the range of sandy to clayey. Strength tests were conducted for these soils with varying amounts of lime and pozzolan, in different curing age from zero days to 28 days. Standard tests on physical properties for materials before and after stabilization of mixes were conducted mostly based on standards, specifications and test methodology of the Ministry of Works (Tanzania). Further, specialized chemical and mineralogy analyses using X-ray fluorescence (XRF) and X-ray diffraction (XRD) methods were carried out on soils to study minerals present and their contribution to lime-pozzolan reactions. Results show that, for the tested range, density and moisture content for Kifaru soil (sandy) were increasing with pozzolan while for Ngangu soil (mostly clay) the opposite was the case. There was an increase in strength for all soils with the increase of pozzolan and lime contents. Pozzolan contents were increased in ratios to lime content, i.e. 1:1, 2:3, 1:2, 2:5 and 1:3. Lime-pozzolan ratio of 1:3 was found to have the highest strength for all soils than other tested ratios; this implies that pozzolan from Oldonyo Sambu is very reactive. Chemical and Mineralogical tests on Ngangu soil revealed high content of hematite (Fe203) and kaolinite (Al2Si205(OH)4) with significant amount of quartz (Si02) and almost absence of base minerals.

About Library

The University of Dar es Salaam Library is a vital source of scholarly information that facilitates users to get access to learning and research resources during their studies. It provides access to a wide range of resources in both print and digital formats and conducive reading environment for users, regardless of their physical conditions. All registered users are eligible to access library resources and can borrow print materials from general shelves for a specific period of time.

Useful Links

Koha Staff Login

University Research Repository

WebMail

Aris

Book Study Room

Mara Oral History

Hansard

SOCIAL MEDIA

Instagram

Facebook

Twitter

YouTube

WhatsApp

Ask Librarian

Contact Us

Postal Address
P.O.Box 35092
Dar es Salaam

Call Us: +255 22 2410500/9 Ext. 2165 ; Direct line +255 22 2410241

Fax No:: +255 22 2410241

Email:: directorlibrary@udsm.ac.tz

2025 University of Dar es Salaam - University Of Dar Es Salaam Library
Term of use / Privacy Policy