Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Evaluation of cost-effective thin modified binder seals on Nano-Modified Emulsion (NME) stabilised base layers using Accelerated Pavement Testing (APT)

Version 1 : Received: 26 January 2021 / Approved: 28 January 2021 / Online: 28 January 2021 (15:35:30 CET)

How to cite: Jordaan, G.J.; Steyn, W.J.V.; Broekman, A. Evaluation of cost-effective thin modified binder seals on Nano-Modified Emulsion (NME) stabilised base layers using Accelerated Pavement Testing (APT). Preprints 2021, 2021010589 (doi: 10.20944/preprints202101.0589.v1). Jordaan, G.J.; Steyn, W.J.V.; Broekman, A. Evaluation of cost-effective thin modified binder seals on Nano-Modified Emulsion (NME) stabilised base layers using Accelerated Pavement Testing (APT). Preprints 2021, 2021010589 (doi: 10.20944/preprints202101.0589.v1).

Abstract

Emulsion stabilisation of base layers surfaced with chip seals often proves problematic with chips punching into the base and early distress. This can be aggravated by the use of modified binders that restricts the evaporation of moisture from pavement layers. The introduction of New-age (Nano) Modified Emulsion (NME) stabilisation has the advantage that water is chemically repelled from the stabilised layer resulting in an accelerated development of strength. A need was identified to evaluate the early life performance of selected chip seals, together with identified binders. Three different chip seal surfacings with unconventional modified binders were constructed and evaluated using Accelerated Pavement Testing (APT) with the MMLS3. The objectives of the experimental design and testing were to evaluate binder performance, early loss of chips before chip orientation at low temperatures, punching of the chips into the NME stabilised base, deformation characteristics of a Cape seal and the effect of the use of a standard normal modified binder. This paper contains details of the NME base layer, the binder and seal selection and the test results. It is shown that a cost-effective thin chip seal in combination with a suitable binder can be used on a NME stabilised base with confidence.

Subject Areas

nanotechnology in pavement engineering; thin surfacings for New-age (Nano) Modified Emulsion stabilised base layers; applicable modified binders for chip seals; Cape seals using anionic New-age Modified Emulsion slurries; Sasobit-M® modified binders for chip seals.

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