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Cement Performance in Sand Cement Blocks – A Case Study from Dar es Salaam, Tanzania
Unversity of Dar Es Salaam.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Industrial Engineering & Management.ORCID iD: 0000-0002-6487-5522
2016 (English)In: Advances in Cement and Concrete Technology in Africa (ACCTA) conference January 27-29, 2016 in Dar es Salaam, Tanzania http://www.accta2016.bam.de/en/home/index.htm, 2016, 383-391 p.Conference paper, Oral presentation only (Refereed)
Abstract [en]

In Tanzania a large part of the building material products, especially in Dar es Salaam, consist of solid sand cement blocks - sandcrete. The objective of the investigation was to determine cement performance in these sandcrete blocks and to relate results to a defined best performance. The purpose was to assess how well the cement compressive strength potential has been utilised and to identify factors affecting the performance. Results indicate that only about 30% of the inherent cement compressive strength potential is used and that the main problem is the design of the sandcrete blocks. Mostly solid six-inch blocks consisting of cement sand and water are used in Dar es Salaam. The compressive strength requirement is relatively low which leads to a low cement content. Proper compaction of the sand cement blocks requires high amounts of water leading to high water cement ratios with these often being over 1. This then leads to that only about 30% of the cement building potential is used. Since cement drives price and the carbon footprint the situation is far from ideal. One possible improvement would be to change from solid to hollow blocks, which would enable a lower water to cement ratio.

Place, publisher, year, edition, pages
2016. 383-391 p.
Keyword [en]
Sandcrete, sand cement blocks, water to cement ratio, carbon footprint, sand quality, compressive strength, sand bulk density.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-326687OAI: oai:DiVA.org:uu-326687DiVA: diva2:1128160
Conference
Advances in Cement and Concrete Technology in Africa (ACCTA) conference January 27-29, 2016 in Dar es Salaam, Tanzania
Available from: 2017-07-22 Created: 2017-07-22 Last updated: 2017-08-03Bibliographically approved

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CiteExportLink to record
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