Study on Field Thermal Curing of Ultra-High-Performance Concrete Employing Heat of Hydration

Sbia, Libya Ahmed; Peyvandi, Amirpasha; Harsini, Iman; Lu, Jue; Abideen, Saqib Ul; Weerasiri, R. R.; Balachandra, Anagi M.; Soroushian, Parviz

doi:10.14359/51689677

Cited by 13 publications

(6 citation statements)

References 45 publications

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“…Ultra-high performance concrete (UHPC) is a cement-based composite that can exhibit high strength and advanced durability properties as a result of its low water/binder ratio and fine-rich design. Due to its high cement content, the hydration heat of UHPC can be relatively large [1]. As a result, the problems encountered in the production of mass concrete can also be seen in the case of UHPC structural members with reduced cross-sectional areas.…”

Section: Introductionmentioning

confidence: 99%

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

Yalçınkaya

Çopuroğlu

2021

Journal of Building Engineering

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Ultra-high performance concrete (UHPC) is an innovative cement-based composite with high mechanical performance under tensile and compressive loads, extremely low permeability, and excellent durability. Because of these features, UHPC has the potential to contribute to the development of new architectural perspectives and structural systems with prolonged service life; therefore, it is anticipated that the use of UHPC in cast-in-situ applications will increase in the near future. As a result of its high Portland cement dosage, the hydration heat of UHPC can be relatively high compared to that of conventional concrete. Thus, ground granulated blast furnace slag (GGBS) can be used in UHPC formulation for reducing Portland cement dosage thereby limiting hydration heat while also addressing ecological and engineering concerns. In the scope of this study, the effects of GGBS replacement (0%, 30%, and 60%) on the hydration heat, strength, and microstructural characteristics of UHPC were studied. Results showed that GGBS-bearing UHPCs are more sensitive to ambient temperature in respect to cumulative heat. 60% GGBS replacement reduced cumulative heat release by 36% and 28% at 20 • C and 35 • C respectively. So, the benefit of GGBS on reducing hydration heat is less pronounced in hot weather. Performance differences in strength depending on the replacement ratio were only noticeable on the first day of curing. Prolonged curing time and fiber inclusion eliminated strength differences. Microstructural investigations indicated that Ca(OH) 2 can be lowered up to 0.5%, and the Ca/Si ratio of the C-S-H phase was reduced below the value of 1.0 after 90 days of curing as a result of GGBS replacement.

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Section: Introductionmentioning

confidence: 99%

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

Yalçınkaya

Çopuroğlu

2021

Journal of Building Engineering

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“…Ambient temperature followed expected trends based on weather conditions and day–night cycles. The internal transducers provide matching data before casting and a temperature spike directly following casting of the UHPC, as expected with the heat of hydration ( 43 ). After the initial setting period of the UHPC, both internal temperature transducers matched the trend of the ambient temperature transducer with noticeably reduced peaks due to the insulation that the UHPC provided.…”

Section: Data Collection and Resultsmentioning

confidence: 69%

Rehabilitation of Corroded Steel Bridge Girder Ends using Partial-Height Ultra-High-Performance Concrete Encasement

Lassy,

Hain,

Zaghi

et al. 2023

Transportation Research Record: Journal of the Transportation R

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Beam end corrosion is one of the most prominent types of deterioration on simple-span steel bridges. To address this concern, the Connecticut Department of Transportation and the University of Connecticut have jointly developed a repair method for corroded steel girder ends using ultra-high-performance concrete (UHPC) encasement. In this repair, shear studs are welded to the undamaged portion of the web and encased in UHPC to create an alternate load path for bearing and shear forces. This novel repair method has been implemented in multiple states. The widespread promotion of steel girder end repair with UHPC demonstrates the need for literature on field implementations and alternative designs. This paper advances the findings from a field implementation completed in Connecticut in October 2021, which was the first instance of a partial-height repair in the country, the first application of the repair to a weathering steel bridge, and the first use of flange studs to restore shear capacity at the junction of the web and bottom flange. Two of the girder ends were fully instrumented to collect data on the performance of the repaired locations. The paper presents an overview of the bridge, discusses the design and implementation of the repair, provides short-term monitoring data showing its successful activation, and discusses lessons learned throughout the process. It is anticipated that the findings put forward provide support for the use of UHPC encasement as a promising method for the repair of corroded steel girder ends.

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“…Therefore, conducting simulation studies on the temperature and stress field of concrete structures during the early-age phase is of paramount practical significance to prevent temperature-related cracking. Many scholars have made significant progress in various aspects such as cement types [3][4][5], concrete mix proportions [6][7][8], admixtures [3,[9][10][11][12][13], cooling pipe design [3,[14][15][16], curing methods [17][18][19], and finite element model optimization [20,21]. Regarding concrete mix proportions, Barbara, Yunus, and others [22,23] proposed that reducing cement content is an effective method to maintain lower concrete temperatures.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Ambient Temperature and Reasonable Heat Dissipation Coefficient of Mass Concrete Pouring Blocks

Zhang,

Zhao

et al. 2024

Materials

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In engineering practice, similar surface insulation measures are typically applied to different parts of mass concrete surfaces. However, this can lead to cracking at the edges of the concrete surface or the wastage of insulation materials. In comparison to flat surfaces, the edges of mass concrete structures dissipate heat more rapidly, leading to more pronounced stress concentration phenomena. Therefore, reinforced insulation measures are necessary. To reduce energy consumption and enhance overall insulation effectiveness, it is essential to study the specific insulation requirements of both the flat surfaces and edges of concrete separately and implement targeted surface insulation measures. Taking the bridge abutment planned for pouring in Nanjing City as the research object, this study established a finite element model to explore the effects of different ambient temperatures and different surface heat dissipation coefficients on the early-age temperature and stress fields of different parts of the abutment’s surface. Based on simulation results, reasonable heat dissipation coefficients that meet the requirements for crack prevention on both the structure’s plane and edges under different ambient temperatures were obtained. The results indicate that under the same conditions, the reasonable heat dissipation coefficient at the edges was smaller than that on the flat surfaces, indicating the need for stronger insulation measures at the edges. Finally, mathematical models correlating ambient temperature with reasonable heat dissipation coefficients for the structure’s plane and edges at these temperatures were established, with high data correlation and determination coefficients (R2) of 0.95 and 0.92. The mathematical models were validated, and the results from finite element calculations were found to be consistent with those from the mathematical models, validating the accuracy of the mathematical models. The conclusions drawn can provide references for the insulation of similar engineering concrete planes and edges.

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Study on Field Thermal Curing of Ultra-High-Performance Concrete Employing Heat of Hydration

Cited by 13 publications

References 45 publications

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

Rehabilitation of Corroded Steel Bridge Girder Ends using Partial-Height Ultra-High-Performance Concrete Encasement

Relationship between Ambient Temperature and Reasonable Heat Dissipation Coefficient of Mass Concrete Pouring Blocks

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