Microanalysis of Alkali-Activated Binary Blended Cementitious Filler in a Novel Cold Binder Course Mixture

摘要

In this study, a new alkali-activated binary blended filler (ABBF) content high calcium fly ash (HCFA) and aluminasilica rich waste material (HASW) was developed for use as a replacement for the limestone filler in a cold asphalt concrete bituminous emulsion in binder course (CACBC) mixtures. Indirect tensile stiffness modulus (ITSM) test was used to assess the enhancement in mechanical properties of the CACBC. Additionally, scanning electron microscopy (SEM) and X-ray diffraction (XRD) were implemented to study the microstructural properties to explain the increase of the ITSM of the new CACBC mixture at different ages. The experimental results have shown a considerable improvement in the indirect tensile stiffness modulus when using the ABBF as a filler substitution when compared with a conventional hot mix asphalt concrete binder mixture. Furthermore, SEM analysis and XRD proven the formation of hydration products after varying curing ages within the ABBF.