Use of fan shell waste as fine aggregate in concrete subjected to coastal erosion (#450)

Authors

Farfán Córdova, Marlon Gastón

Meza Lizárraga, Jorge Pablo

Mendoza Tajiri, Carlos

Abstract

The present study is based on the use of crushed fan shell waste (FSW) between the sizes of 0.6 mm and 2.36 mm incorporated in the concrete mix to measure its properties in the fresh and hardened state. This waste product is of great interest for the construction sector, as an additive or as a partial or total replacement of aggregates in the production of concrete or as a soil amendment. The experimental design consists of the preparation of two concrete mixes designed for strengths of f'c=175 kg/cm2 (M1) and f'c=210 kg/cm2 (M2) and water/cement ratios of 0.61 and 0.55, respectively. The mixes were supplemented with 5, 10, and 15% crushed FSW to replace the fine aggregate, and the mix was evaluated for workability in fresh concrete, compressive strength, and indirect tensile strength in hardened concrete after 14 and 28 days of curing. Flowability and consistency were slightly affected, as were plasticity and workability for M1 and M2, respectively. The design compressive strength was exceeded by both experimental specimens (M1 and M2), reaching 196.99 and 234.86 kg/cm2, respectively. Indirect tensile strength showed a slight decrease as the amount of FSW was increased, reaching up to 20.09 kg/cm2 for M2. Finally, the results showed that the replacement at 5% guaranteed a higher compressive strength of the concrete at 28 days, although at 10 and 15% also exceeded the design strength.