Rheological Evaluation of Ultra-High-Performance Concrete as a Rehabilitation Alternative for Pavement Overlays
Hermes Vacca, Yezid A. Alvarado, Daniel M. Ruiz, Andres M. Nuñez
TL;DR
This study explores how adjusting superplasticizer levels in concrete affects its flow and strength, making it suitable for pavement overlays on slopes.
Contribution
A predictive model for critical yield stress and a viable UHPFRC mix for sloped pavement overlays are proposed.
Findings
Reducing superplasticizer increases yield stress and viscosity while maintaining high compressive and flexural strength.
The SP-2 mix met stability and performance criteria and was successfully tested in a prototype overlay.
Rheology-tailored UHPFRC is confirmed as a durable solution for pavement overlays in challenging conditions.
Abstract
This study evaluates the rheological behavior and mechanical performance of Ultra-High-Performance Fiber-Reinforced Concrete (UHPFRC) mixes with varying superplasticizer dosages, aiming to optimize their use in pavement rehabilitation overlays on sloped surfaces. A reference self-compacting UHPFRC mix was modified by reducing the superplasticizer-to-binder ratio in incremental steps, and the resulting mixes were assessed through rheometry, mini-Slump, and Abrams cone tests. Key rheological parameters—static and dynamic yield stress, plastic viscosity, and thixotropy—were determined using the modified Bingham model. The results showed that reducing superplasticizer content increased yield stress and viscosity, enhancing thixotropic behavior while maintaining ultra-high compressive (≥130 MPa) and flexural strength (≥20 MPa) at 28 days. A predictive model was validated to estimate the…
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Taxonomy
TopicsInnovative concrete reinforcement materials · Diabetic Foot Ulcer Assessment and Management · Concrete and Cement Materials Research