Properties and Microstructures of Steel Slag Pervious Concrete with Anticrack Additives

Abstract

Steel slag pervious concrete (SSPC) is a novel sustainable and ecofriendly pavement material. The constituent elements making up SSPC are typically cement, steel slag, superplasticizer, sand, and water. To improve its strength and cracking resistance, an optimum amount of anticrack additives (ACA) was added to SSPC. In this paper, the relationships between the mechanical properties and the microscopic characteristics of SSPC with ACA were studied using the universal testing machine (UTM), X-ray diffractometer (XRD), Fourier infrared spectrometer (FTIR), and scanning electron microscope (SEM)s. The test results indicated best strength and cracking resistance performance for the SSPC with 0.3% ACA. From XRD and FTIR analysis, the main hydration products were found to mostly contain calcium-silicate-hydrate (C─ S─ H) gel and Ca(OH)2. However, with an increase in the ACA content, the SSPC strength decreased progressively. Overall, the study indicated that 0.3% was the optimum ACA dosage to maximize the SSPC performance in terms of mechanical strength and cracking resistance.