Georges Mturi points out that about 30% of bitumen used in asphalt in South Africa is modified. In this paper he discusses the context, typical additives used, guidelines and specifications, as well as selection and classification of additives. In addition to performance, Georges explores aspects such as storage, expertise required, availability of base binders and modifier, shelf life, blending and quality control. His rule of thumb – use locally available aggregate and bitumen sources and only use additives where normal binders are limited in performance.
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