Hi-Stac 40 (large stone asphalt pavement)

It is a mixture using large stone as large as 40 mm as aggregates with continuous gradation. The binder used is straight asphalt.
In case used as surface course, plant fibers are added in order to improve surface texture.

Photo. 1 The mixture at the side for paver screed

Photo. 2 The cross section of the pavement body (direction to the paver's progress)

Merits

Excellent at rutting resistance (Fig. 1)
Excellent at raveling resistance (Fig. 2)
By adding plant fibers, the surface texture become almost the same as dense graded asphalt mixtures of 20 mm maximum aggregate size. (Fig. 3)

Fig. 1 Rutting Resistance

Fig. 2 raveling resistance

Fig. 3 Surface coarseness

Applicable to;

Surface course and binder course of the ultra-heavy duty roads in factory yards or so on.
Surface course and base course for port yard.
Binder course of heavy duty roads.

Typical Pavement Structure

Fig. 4 Typical Pavement Structure

Gradation of Mixture (Example)

Properties at Marshall Tests

Table 1 Results of Marshall Tests (0.4 % of plant fibers are added)
Asphalt Content (%)	Density g/cm³	Theoret- ical density g/cm³	Voids (%)	Per- cent Voids	Satura- tion (%)	Stability (kgf)		flow (1/100cm)		Residual Stabil- ity (%)
						Stand- ard	Immer- sion 72h	Stand- ard	Immer- sion 72h
5.0	2.383	2.491	4.3	16.0	73.1	3002	296.0	41	37	99

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