Application Cases of Slurry Seal in Japanby Akira Ito, Nichireki Chemical Industry Co, Ltd, Tochigi-Prefecture, Japan,
Abstract: In Japan, slurry seal began to be used for repairing asphalt pavements at around 1963, mostly for repairs of prefectural and municipal roads. In recent years, however, it has rarely been put into use and has not found extensive use yet. This trend in the country is in contrast with that in foreign countries. With the conventional slurry seal, which uses a fine aggregate of river sand and a slow-setting asphalt emulsion, it takes several hours to open the treated pavement to traffic because of the slowness in setting. Lately a quick-setting slurry seal has been developed which is free from the drawbacks of the conventional one and make it possible to open the treated pavement to traffic on about 30 minutes. Namely a quick-setting type anionic asphalt emulsion was developed and put into use in 1972 and a quick-setting type cationic asphalt emulsion in 1980. In this paper, the authors describe the properties of the quick-setting cationic slurry seal mixture, an example of its application for initial curing right after construction of a Roller Compacted Concrete Pavement and for surface protection of this pavement, and an example of application of a color slurry seal.
Subject Headings: Slurries | Asphalt pavements | Concrete pavements | Mixtures | Case studies | Roller-compacted concrete | Asphalt concrete | Rehabilitation | Surface properties | Japan | Asia
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