Effect of Fine Aggregate Particle Characteristics on Mechanical Properties of Fly Ash-Based Geopolymer Mortar

This research aimed to investigate the effect of fine aggregate particles on mechanical properties fly ash-based geopolymer mortar. In this work, seven kinds river sand were designed based different characteristics. The fineness modulus was adopted quantitatively describe gradation sands. fluidity, compressive, flexural, and tensile strengths mortar with gradations analyzed by laboratory tests. Furthermore, composition morphology X-ray diffraction (XRD) scanning electron microscopy (SEM). reasonable range filling obtained. results show that fluidity compressive flexural both improve increase modulus, while specific surface area voidage are opposite. strength largely lies interface between binder aggregates. When pass rate key sieving size 1.18 mm is 75–95%, 0.15 15–25%, 2.2–2.6 appropriate coefficient paste around 1.0–1.15, comprehensive performance best. paper could provide a basis for design ash, it great significance its popularization application.