Abstract Infrastructure maintenance and preservation are important activities for any developing city. Microsurfacing is a well known slurry seal surface maintenance technique that leverages the use of cationic quick setting slurry. The technique is considered by some practitioners to be more economic than other conventional surface treatment methods such as asphalt and chip seal. Micro
read moreSEALS FOCUS AREA Early life performance of non-homogenous modified binder (Bitumen Rubber) grade S-R2 in Namibia Herman Mostert, Element Consulting Engineers, Namibia Abstract Bitumen Rubber binders have been used in Chip seals in South Africa since the early 1980’s. Over the past 3 decades the use thereof has extended to southern Africa, including Namibia where
read moreAbstract EME are used for pavements which require a high stiffness modulus, high resistance to rutting, good fatigue resistance and good durability. This technical solution has been already used with great success in South Africa and more projects are currently being developed. But EME quality is also dependent on its key components. One of the
read moreAbstract Traditionally, pavement designs consisted of considering the design traffic loading over the structural life of the road together with a single conservative estimate of the layer moduli in order to estimate the bearing capacity of the pavement using mechanistic analysis. Only a single point in time is considered ignoring the changes in layer characteristics
read moreAbstract Plastic strain causes non-recoverable, permanent deformation in pavement layers. The effect of plastic strain is generally referred to as rutting. Rutting may occur throughout the pavement structure in granular, stabilised and asphalt layers. Granular materials exhibit plastic deformation when loading occurs outside the elastic limits. The fatigue life evaluation of granular layers during design
read moreAbstract Our world is rapidly changing. Globally we are experiencing the effects of developments in technology but also a change in the character of our society. As a people we have understood for example that we have to be more respectful to our surroundings, to become more environmentally aware, be less wasteful. And well, if
read moreAbstract With all the waste generated by humanity on a daily basis, the roads industry has a responsibility to find sustainable applications for materials re-use and recycling whilst maintaining product quality and performance at the required standards. In recent times, the recycling of glass, plastic, slag aggregates, ground tyre rubber and reclaimed asphalt in fresh
read moreDownload Presentation Abstract Linking the Technical Standards, Guidelines & Manuals can be the difference between the (un)successful implementation of a project. The importance key role players in understanding the link of appropriate information into the project specifications cannot be understated. The current COTO Standard Specification aims to incorporate the latest design requirements for asphalt mixes,
read moreDownload Presentation Abstract Much emphasis is usually placed on getting the asphalt mix design correct, running the relevant trials and agreeing on a final approved mix design for construction. Proper quality management in terms of monitoring and acceptance, which ensures consistency and achieving the desired result, is however often overlooked in practice. A background will
read moreAbstract The hot mix asphalt mix design process and testing technology are moving at such a rapid pace that it may create different challenges than the current benchmarks used for mix analysis. It is as important as ever to be able to review and track where the local industry is currently and where it may
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