Bituminous Surface Treatment (BST) is single or double application of binder and chipping on prepared granular base or existing chipping layer or old asphalt concrete for preventive purposes. In Turkey, BST is widely preferred because of relatively lower cost and faster construction than those of conventional asphalt concrete. There are a few BST design method in the world and all are basically derived from first design method proposed by Hanson. UK design method has been used for about 50 years in Turkey. The long years experiences of BST applications has been revealed the need for new design method since the existing design values significantly need to be modified in the field. This paper proposes a new design method, namely "KGM Design Method", for single and double surface treatments considering laying season as well as Average Least Dimension of Aggregate, climate, surface characteristics, aggregate and binder properties.
Warm mix asphalt (WMA) is a growing sustainable pavement technology reducing the production and paving temperature of asphalt mixture by 20-40 oC without compromising the performance. The main advantages of WMA are reduced fuel consumption, increased hauling distance, extended paving season, better compaction, reduced emissions and binder oxidation. In this study, it was attempted to develop a new zeolitic and paraffinic WMA additives. Warm mix asphalt mixtures with commercial and newly produced additives were subjected to the rutting, fatigue, water sensitivity (ITSR) and workability tests in laboratory. The two of the additives performing best in laboratory were used in WMA production in real field application. It was seen that all additives gave small amount of reduction in ITSR performance but similar performance in rutting and fatigue in laboratory. However actual field application showed that the additives provide better compatibility and same as or better performance than hot mix in all respects. This paper evaluates laboratory and field performance of commercial and newly developed WMA additives.
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