STRENGTH PROPERTIES OF ROAD BASE MATERIALS BLENDED WITH WASTE LIMESTONES

Abstract

Most areas in the Philippines experience high road construction cost due to the limited supply of
suitable materials for road embankment within economic haul distances. Considering that the country is
currently having extensive infrastructure development, potential use of naturally-occuring materials such as
limestones was tested resulting not only as an economic alternative to the conventional materials, but leading to
an improved strength of roads. Geotechnical and morphological properties of pure and blended materials were
determined characterizing the behavior of the strength of the materials as limestone blend varies. A 50% blend of
limestone to conventional road base materials provided optimum strength increasing the values up to 30%, 100%
and 40% for unsoaked CBR, soaked CBR and UCS, respectively.