Asphalt Mixtures with Limestone Aggregate for Base Layer

Abstract

Asphalt mixtures are mixtures of mineral aggregates, filler, bitumen and eventually additives in proportions determined by recipe designed in the laboratory. Asphalt mixtures used as base course are bituminous concrete. The natural aggregates are granular materials of mineral origin that come from natural or artificial crushing of the rocks. In our country there are the various rocks: eruptive or magmatic rocks, metamorphic rocks, sedimentary rocks. To the category of sedimentary rocks belong limestone. Sedimentary rocks are characterized by relatively high porosity and a pronounced stratification, which causes mechanical resistance to be low and vary by direction of load. Due to the structure less dense and weaker mechanical resistance, the limestone are used less in heavy traffic pavement structures. This paper presents an asphalt mixture recipe for the base layer developed in the Laboratory of Roads from Technical University of Civil Engineering Bucharest (TUCEB), using limestone aggregates extracted from Hoghiz Quarry. The paper contains laboratory test results to determine the recipe and laboratory findings leading to the schedule of product.

Mechanical Properties of Unbound Perlis Limestone and Granite Aggregate Mixture for Road Application

“…Metamorphic rocks are also considered with extremely high densities and mechanical strengths. Meanwhile, sedimentary rocks are characterized by a relatively large porosity and a distinct stratification, which results in low mechanical resistance which varies with the direction of force [1].…”

“…Malaysia also produces IOP Publishing doi:10.1088/1755-1315/1135/1/012054 2 vast and diverse quantities of aggregates, the majority of which consist of granite and limestone and the remainder of which are basalt, diorite, and gravel [2]. Limestone is employed less frequently in heavy traffic paving structures as a result of the concentration of large companies and aggregate factories on granite as the primary ingredient [1]. In recent years, however, the idea of using limestone in road applications has gained traction, as testing samples of varying limestone quality revealed that highquality limestone may outperform granite in terms of mechanical properties.…”