Artikel - The Influence of Grout Containing Fly Ash on The Tensile Strength of Grouted Macadam - Retno Tri Nalarsih

Grouted Macadams are manufactured by producing a very open porous asphalt skeleton and filling the
voids with selected cementitious grouts, the final product is combination of the flexibility of the bituminous
component with the strength and rigidity of the cementitious component. A range of cementitious grouts
was formulated using a variety of binders including ordinary Portland cement, silica fume and fly ash. The
grouts were designed to provide improved strength and performance characteristics with reduced
water/binder ratios, whilst maintaining high workability. This was achieved with the aid of chemical
admixtures that allowed the grouts to penetrate the porous asphalt skeleton by gravitational. The
formulated cementitious grouts attained high strength characteristics (90-120 MPa at 28days), with the
pozzolanic materials silica fume and fly ash, providing improved permeability and shrinkage properties.
This paper is discussing the influence of grout properties containing fly ash especially on the indirect
tensile properties of grouted macadam. It is concluded that the indirect tensile strength of grouted
macadams were greatly affected by the cementitious grout type, in general the higher the compressive
strength of the cementitious grout, the higher the tensile properties of the hydrated grouted macadam.
Keywords
Grouted macadam, fly ash, indirect tensile strength