Journal
JOURNAL OF THE SOUTH AFRICAN INSTITUTION OF CIVIL ENGINEERING
Volume 63, Issue 2, Pages 27-34Publisher
SAICE-SAISI
DOI: 10.17159/2309-8775/2021/V63n2a4
Keywords
concrete durability; durability index; water sorptivity; porosity; absorption
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Funding
- Concrete Materials and Structural Integrity Research Unit (CoMSIRU) at the University of Cape Town
- AVENG
- Water Research Commission of South Africa (WRC)
- South African Department of Water and Sanitation
- Transnet
- PPC Cement (Pty) Ltd
- AfriSam
- Lafarge
- SIKA
- Haw Inglis
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This paper examines the Durability Index approach used in South Africa, suggesting that porosity should be adopted as an additional index. It concludes that sorptivity cannot be interpreted without also considering the porosity value, as these two parameters are interrelated.
The Durability Index (DI) approach used in South Africa is linked to transport-related properties of the cover layer of concrete. This performance-based approach utilises three different durability-related parameters, namely Water Sorptivity Index (WSI), Oxygen Permeability Index (OPI) and Chloride Conductivity Index (CCI). In the water sorptivity test, both the sorptivity and the water-penetrable porosity of the concrete are measured. Until now, porosity has not been considered directly as a separate durability-related parameter. This paper analyses these implications and suggests that porosity should be adopted as a further index. The paper concludes that sorptivity cannot be interpreted without also reflecting the porosity value since these two parameters are inter-related.
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