Strength Properties Evaluation of Asphalt Concrete Produced with Sandcrete Block Powder

Abstract

This paper presents the results of the strength properties evaluation
of asphalt concrete produced with sandcrete block powder.
Sandcrete block powder (SBP) was used as a mineral filler, while
stone dust (STD) filler was used in this research as the control
material. Sixteen (16) asphalt concrete specimens were produced
with 5 % bitumen, 40% fine aggregate, 60% coarse aggregate, and
2-5% filler proportions by weight of 8 kg. The samples were
produced separately in 2, 3, 4, and 5% proportions by weight of
each of SBP and STD. The aggregates were properly mixed and
stirred while being heated to a temperature of 1000–1200 °C. A
total of sixteen (16) cylindrical asphalt concrete samples were
produced with 5% bitumen, 2 to 5% fillers (SBP and STD), 40%
fine aggregate, and 60% coarse aggregate proportions by weight.
Eight (8) samples were submerged in water for 24 hours from the
sixteen (16) samples in view. The Marshall stability test examined
the flow and stability of the asphalt concrete samples. The results
showed that using sandcrete block powder as a filler material
increases stability by up to 340%. However, it reduces when the
asphalt concrete samples are soaked. The optimum stability value
was reached at 2% sandcrete block powder as filler. The sandcrete
block powder as filler in asphaltic concrete production should not
be more than 3%. Asphaltic concrete's stability and flow results
conform to the specifications stated by the Asphalt Institute. This
makes the sandcrete block powder suitable for use in asphaltic
concrete production.