Merging procurement and engineering requirements with the introduction of new (NANO) modified emulsion (NME) technologies through "end product specifications"

Abstract

Introducing New (Nano) Modified Emulsions (NME) into the road industry has been shown to have considerable advantages in terms of road pavement durability and the delivery of climate-resilient, cost-effective road infrastructure. However, the introduction of new

stabilising agents for granular materials has the potential to also open the door to the so- called “snake oils” or sub-standard stabilising agents with resultant dire consequences to

perceptions regarding the introduction of new technologies for the improved utilisation of naturally available granular materials in the road environment. Procurement rules often prevent authorities from specifying any specific product. However, the industry can specify “End Product Specification,” where the contractor can use any supplier with products that meet basic engineering material and practical specifications beneficial to road projects. This paper discusses some basic requirements, introducing typical clauses that should be incorporated into an “End Product Specification”. To ensure successful application in practice, practical aspects related to material stability in harsh environmental conditions, water quality, material quality control test procedures, reworking of materials in case of failures and equipment requirements as related to the application of NME materials should all form part of such “End Product Specifications”. The primary purpose of these specifications is to reduce risks to road agencies, ensuring that sub-standard stabilising agents are not introduced under the cover of NME.