Laboratory and Field Investigations on High-Volume Fly Ash Concrete for Rigid Pavement

Abstract

There is a need for optimization of materials in the concrete road system by considering ecologically sound choices. This paper presents a study on the suitability of high-volume fly ash concrete (HFC) mix with 60% cement replacement for rigid pavements. Low-calcium fly ash was used for cement replacement. Laboratory investigations were conducted to establish the strength and durability properties of HFC. Durability tests were conducted to determine resistance to acid attack, water absorption, porosity, sorptivity, and abrasion resistance. Field investigations were also conducted to study the response of instrumented test sections of HFC and plain concrete for thermal and wheel loads. Three-dimensional finite element analysis results for wheel load strains were validated from the field results. Static strengths and durability properties of HFC were satisfactory for pavement construction. The performance of a HFC test section under thermal and wheel loads was satisfactory.

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