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• W69561010 abstract "Although accelerated laboratory curing of bitumen-emulsion and foamed bitumen treated materials is undertaken widely, there is not an accepted standard procedure. A major contributing factor to this situation is undoubtedly the complex composition of these materials, which can include both active and inactive fillers such as lime, cement, fly ash, etc., as well as the bituminous binder and parent material. The complexities of the various chemical reactions and interactions that will occur during the treatment process are poorly understood at best. While an accelerated curing regime should not alter these fundamental processes from those that would occur in field conditions, given the variations in composition of these treated materials in terms of specific composition and quantities, there is concern that the influence of accelerated curing is not fully understood. Consequently there is a significant possibility that laboratory cured specimens have strength or other characteristics that are dissimilar to the field materials that they supposedly represent. This paper, based on a review of past practice and fundamental behaviour, identifies what are regarded as most appropriate laboratory procedures for these types of treated materials to ensure that laboratory testing should reliably characterise field properties. 1. BACKGROUND AND INTRODUCTION The technique of applying small quantities of diluted bitumen-emulsion to unbound roadbase materials in South Africa developed recognition some 30 years ago, primarily as an aid in achieving specified densities when this was otherwise difficult or not possible with the untreated material (Marais & Tait, 1989; Bergh, 2005). Anionic emulsion was adopted at that time as being relatively slow breaking, in order to avoid potential problems of the emulsified bitumen reverting to its normal bitumen type too quickly. Early experience established that more rapid breaking could make any of the mixing, placing and compaction processes unworkable. In some cases, however, it was also found that the emulsion did not break sufficiently quickly and this led to a small amount of cement being introduced to promote the breaking process. Although initially used therefore as a short term construction aid, subsequent qualitative observations from roads constructed using bitumen-emulsion treatment of the base indicated that the longer term performance was also considerably enhanced. Rutting, ravelling and cracking (the most common distress types normally associated with unbound, bitumen-bound and cement-bound roadbases, and consequently providing the point of reference) were generally far less significant to non-existent compared with what Proceedings of the 24 Southern African Transport Conference (SATC 2005) 11 – 13 July 2005 ISBN Number: 1-920-01712-7 Pretoria, South Africa Produced by: Document Transformation Technologies cc Conference organised by: Conference Planners th" @default.
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• W69561010 date "2005-07-01" @default.
• W69561010 modified "2023-09-23" @default.
• W69561010 title "Best practice : Bitumen-Emulsion and foamed Bitumen materials laboratory processing" @default.
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