Upshot of Elevated Temperature on Performance Facet of Fly Ash /OPC Laterized Concrete

Abstract

This study investigates the effects of elevated temperature variation on the compressive strength of Fly Ash/Ordinary Portland Cement (OPC) Laterized concrete (LATCON). Cube specimens were cast, cured in water at ambient laboratory temperature and subjected to different temperature regimes before testing. A mix design of 25N/mm² was adopted for this investigation. The laterite content in the fine aggregate was varied from 0 to 30% at 10% interval with the introduction of Fly ash at 10%, 20% and 30% blending with OPC. Specimens cured for 28 and 90 days were subjected to uniaxial compressive loading tests at room temperature of 21⁰C and elevated temperatures of 250, 350,450 and 550⁰C. The peak compressive strength value of 20.01 and 24.93 N/mm²at 28 and 90 days hydration period and is recorded for the mix with 30% laterite and 10% Fly ash content at 250⁰C. This is an indication that the strength of Fly ash/OPC Laterized concrete is generally sufficient for use at elevated temperature not exceeding 500⁰C.

Keywords: elevated temperature, fly ash, laterite, laterized concrete, compressive strength