Weitere Kapitel dieses Buchs durch Wischen aufrufen
Sub-Saharan Africa’s (SSA) economies are developing at rapid pace. To keep up the verve, housing and infrastructure are urgent challenges, which demand for concrete technologies that can meet the demand. Considering the climate challenges that come along with concrete construction, for the growing African construction business, it is inevitable to use binders with lower carbon footprint and to use chemical admixtures that help reducing cement in concrete.
The use of superplasticizer (SP) and stabilising agents (STA) can enhance the concrete technology in SSA, since they can make concrete quality independent of the boundary parameters. However, the use of cement and concrete additives depends on their availability. Due to the partly poor infrastructure and the lack of chemical industries, in most regions in SSA, the use of admixtures is not yet always common practice. This amplifies the unfavourable framework for concrete construction such as fragmentary supply chains, high local cement prices, and unfavourable construction site facilities in this region significantly.
After providing a general overview of the peculiarities of the SSA boundary framework, and the recommendation of pre-mixed self-compacting concrete (SCC) compounds as a tool to overcome local challenges, a three-step SCC optimisation concept is recommended and experimentally proven based on readily available additives on the African continent. Eventually, the paper elaborates on alternative polysaccharide based rheology modifying agents from agricultural resources and waste materials with high potentials for high-performance concrete applications in SSA.
Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten
Sie möchten Zugang zu diesem Inhalt erhalten? Dann informieren Sie sich jetzt über unsere Produkte:
WBCSD (2016) Getting the Numbers Right, Project Emissions Report 2014
Scrivener K, John VM, Gartner EM (2017) Eco-efficient cements: potential economically viable solutions for a low-CO 2 cement-based materials industry, United Nations Environment Programme, Paris
Schmidt W, Alexander M, John V (2018) Education for sustainable use of cement based materials. Cem Concr Res 114:103–114 CrossRef
Schmidt W, Msinjili NS, Kühne H-C (2019) Materials and technology solutions to tackle the challenges in daily concrete construction for housing and infrastructure in Sub-Saharan Africa. Afr J Sci Technol Innov Dev 11(4):401–415. https://doi.org/10.1080/20421338.2017.1380582 CrossRef
Schmidt W (2016) Why Africa can spearhead innovative and sustainable cement and concrete technologies globally. In: Msinjili NS, Schmidt W (eds) KEYS knowledge exchange for young scientists: valorisation of industrial by-products for sustainable cement and concrete construction – improvement of solid waste management. BAM, Accra, pp 7–19
Schmidt W (2017) Potentials for sustainable cement and concrete technologies – comparison between Africa and Europe. In: Proceedings of the 1st international conference on construction materials for a sustainable future, Zadar, Croatia, 19–21 April 2017
Schmidt W, Falade F, Rogge A, Tchitnga R (2019) ISEE - innovation, science, engineering, education (pre-conference edition). Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, p 134
Ouchi M (1998) History of development and applications of self-compacting concrete in Japan. In: International workshop on self-compacting concrete, Kochi, Japan. JSCE, pp 1–10
Schmidt W, Msinjili NS, Uzoegbo HC, Makunza JK (2015) Admixture concepts for the Sub-Saharan African environment with indigenous raw materials. In: Malhotra VM (ed) SP-302 11th international conference on superplasticizers and other chemical admixtures in concrete, pp 491–505
Puntke W (2002) Wasseranspruch von feinen Kornhaufwerken. Beton 2002(5):242–248
Hunger M, Brouwers HJH (2009) Flow analysis of water-powder mixtures: application to specific surface area and shape factor. Cem Concr Comp 31(1):39–59 CrossRef
Schmidt W (2014) Design concepts for the robustness improvement of self-compacting concrete - effects of admixtures and mixture components on the rheology and early hydration at varying temperatures, PhD, Department of the Built Environment, TU Eindhoven, Netherlands, Bouwstenen 193
Schmidt W, Barucker-Sturzenbecher MJ (2019) Bio-based concrete, Berlin, p 7:51. https://vimeo.com/310549146
Schmidt W, Olonade KA, Tchetgnia Ngassam IL, Mbugua R, Athman Mwende C, Kühne H-C: Pflanzenbasierte Betonzusatzmittel für Hochleistungsbeton. 20. Baustofftagung ibausil, Weimar, vol 20, pp 1-874–1-885
Mwende Athman C (2018) Effectiveness of Gum Arabic as a superplasticizer in self-compacting concrete, MSc, Department of Civil Engineering, Pan African University
Schmidt W, Brouwers HJH, Kühne H-C, Meng B (2017) Interactions of polysaccharide stabilising agents with early cement hydration without and in the presence of superplasticizers. Constr Build Mater 139:584–593 CrossRef
- SCC for Sub-Saharan Africa Based on Local Raw Materials – Material Development, Optimisation, and Application Concept