Development of CORPS-STIF 1.0 with application to ultra-high performance concrete (UHPC)

The use of silica fume in high-strength and ultra-high performance concretes has been studied from many perspectives including optimum replacement rate, implications on late-age strengths, and rheological properties. However, the effects of silica fume purity (e.g., silicon dioxide [SiO2] content) are not nearly as well documented, especially when shorter duration curing regimes at higher temperatures are utilized. In this paper, four silica fumes with varying SiO2 contents were used to quantify the effects of SiO2 purity in silica fume on the behavior of ultra-high performance concrete. Several variables were evaluated to determine if changes in SiO2 content significantly influenced properties of interest. Overall, silica fume purity had the most impact on thermal set time, maximum temperature generated during hydration, and compressive strength. Thermal set time values differed by over 7 h, and maximum temperatures differed by 7°C. After one day of room-temperature curing, compressive strength varied by 50 MPa, and elastic modulus varied by 14 GPa. When specimens were cured at elevated temperatures for short durations of time (e.g., one to six days), fc values ranged from 35 to 47 MPa.

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Toward a Method to Predict Thermo-mechanical Properties of High-Strength Concrete Placements

Carey

Roberson

Howard

et al. 2024

Journal of Testing and Evaluation

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In this article, the merits of a thermo-mechanical framework to estimate properties of high-strength concrete are evaluated for potential standardization as a test method. Previous work conducted by the authors was summarized to show the individual advancements toward development of a laboratory testing framework. Most notably, laboratory-based curing protocols have been shown to produce temperature profiles that were similar to mass placements and achieving peak temperatures that were within 2°C of peak temperatures recorded in a mass high-strength concrete placement. Additionally, current testing methods to determine thermo-mechanical properties of mass concrete placements were reviewed, and a clear disconnect was noticed between methods that are predictive as well as a direct measure of mechanical properties. Based on this review of literature and the advancements summarized by the authors, a testing framework is proposed that takes the first steps toward filling this gap in literature of creating a predictive testing protocol that is also a direct measurement of mechanical properties.

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Development of CORPS-STIF 1.0 with application to ultra-high performance concrete (UHPC)

Cited by 3 publications

References 33 publications

Time-Temperature Implications of Curing on Mechanical Properties of Ultra-High-Performance Concrete

Time-Temperature Implications of Curing on Mechanical Properties of Ultra-High-Performance Concrete

Effects of Silica Fume Purity on Behavior of Ultra-High Performance Concrete

Toward a Method to Predict Thermo-mechanical Properties of High-Strength Concrete Placements

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