TITLE:
Performance Evaluation of Asphalt Concrete Based on Basalt Aggregates of Diack and Quartzite of Bakel
AUTHORS:
Mory Coulibaly, Makhaly Ba, Macodou Thiam, Babacar Diouf
KEYWORDS:
Quartzite, Basalt, Bituminous Concrete, Marshall, Duriez
JOURNAL NAME:
Open Journal of Civil Engineering,
Vol.13 No.4,
December
20,
2023
ABSTRACT: In Senegal, basalt aggregates are the aggregates
used for the production of asphalt. They are also in some condition in base
layer. However, the only licensed and operated basalt quarry in the
west-central part of the country is finished and has reached very important
depths thus constituting an environmental threat. This is how quartzite present
in the east of the country precisely in the department of Bakel would
constitute an alternative to basalt. For this purpose, the performance of two
bituminous concretes based on quartzite and
basalt was compared. One is made from Diack basalt aggregates, considered as the reference aggregate for asphalt in Senegal and the other is based on Bakel quartzite aggregates, they are both
class 0/14. The mechanical performance of two bituminous concretes is evaluated
using the Marshall method. The results obtained from the marshall tests give
compactness values between 94% and 97% representing the limits laid down in the
technical specifications, the creep values for quartzite-based asphalt
concrete, while respecting the limit values, are higher than those obtained
with basalt aggregates. Thus showing that the former is less resistant to
deformation than the former. For both bituminous mixtures, the stability values
remain above the minimum value of 1000 kgf set by the specifications. The water
resistance test carried out on the two bituminous concretes based on basalt
aggregate and quartzite aggregate gives values of immersion/compression ratio
(R’c/Rc) equal to 0.72 and 0.82 respectively. These values are above the
minimum required value (0.70) in the technical specifications in Senegal.