Impact of Fly Ash on Time-Dependent Properties of Agro-Waste Lightweight Aggregate Concrete

Abstract

The utilization of by-products and waste materials to substitute for the natural or manufactured resources is considered as a practical way to obtain green building materials. In concrete mixtures, amongst the many available options, Fly Ash (FA) as a by-product pozzolan has been used as a partial replacement of cement. As for the aggregates, lightweight agro-waste oil palm shell (OPS) can be used as a replacement to conventional aggregate for the production of lightweight aggregate concrete. The present communication aims to investigate the impact of FA on time-dependent development properties of OPS lightweight aggregate concrete, including density, water absorption, compressive strength up to 120-days, and drying shrinkage up to the age of 365-days under standard moist curing, partially early curing, and non-curing conditions. Additionally, drying shrinkage crack development was investigated. In this study, two series of concrete mixtures with different substitution levels of OPS (0%, 50%, and 100%) and FA were tested. From the obtained results, it was concluded that the incorporation of fly ash in OPS concrete reduces the density and compressive strength values. Dually, the initial and final water absorption values plus the rate of drying shrinkage at early and long-term ages increased. On top of that, a high potential of drying shrinkage crack, especially for mixtures with 100% OPS, was identified.

Management of agricultural waste biomass as raw material for the construction sector: an analysis of sustainable and circular alternatives

“…Contrary to [84] and in line with the findings of [24], there is a large and long-standing field of research in AWB-based SCMs for use in concrete production. In this same category, 24% of the studies in the period 2004 to 2021 used AWBs as a total and/or partial substitute material for conventional fine and/or coarse aggregates in concrete [21,28,29,36,66,67,83,[89][90][91][92]. A smaller percentage (3%), between 2019 and 2021, analysed the potential of AWBs as additives and/or aggregates for soil stabilisation and/or improvement of geotechnical properties [69,70,93].…”

“…Positive impacts on air, soil and water resources are comprehensively listed in Table 5. Among the main benefits mentioned are reduction of carbon dioxide emissions and global warming [24,25,52,54,68,83,86,91,104]. Similarly, aspects related to the efficient management of AWB, such as volume reduction, recycling, recovery, reduction of landfills and open burning [5,33,63,77,85,101].…”

Uso de materiales ligeros para la producción de hormigón de baja densidad: una revisión literaria

“…Para producir hormigón ligero, se han empleado distintos tipos de materiales como áridos ligeros. La exhaustiva investigación de Maghfouri et al (2021) se abocó a esos diversos tipos de materiales que pueden ser utilizados en el LWAC con una densidad aparentemente sobresaliente.…”

Stormwater Runoff Treatment Using Pervious Concrete Modified with Various Nanomaterials: A Comprehensive Review

“…As a natural volcanic lightweight aggregate, scoria can be employed in place of coarse aggregates in PC [132]. As can be seen in Table 1, the dry density, bulk density, saturated density and water absorption of scoria aggregates are 1710 kg/m 3 , 2150 kg/m 3 , 1910 kg/m 3 and 11.90%, respectively [133].…”