Mechanics-based model for cold joints in reinforced concrete members
Abstract This study introduces a mechanics-based numerical model to characterize the behavior of cold joints in reinforced concrete
High-efficiency and stable cold joint
High-efficiency and stable cold joints can be achieved through proper surface preparation, reinforcement strategies, advanced monitoring systems, and the use of high-performance materials like cold shrink elastomers or treated concrete interfaces.
Concrete Cold Joints
Definition and Challenges: Cold joints in concrete occur when new concrete is poured over hardened or partially set concrete, creating a potential weak interface that can reduce flexural strength, ductility, and energy dissipation capacity of the structure . They can also increase porosity, leading to durability issues such as chloride ion penetration . Enhancing Stability and Efficiency:
- Surface Preparation: Roughening the joint interface before pouring new concrete improves bonding and shear transfer .
- Reinforcement Techniques: Using sufficient reinforcement bars across the joint and optimizing their orientation enhances stiffness and peak strength .
- Material Selection: High-strength concrete and additives can improve the mechanical properties at the joint interface .
- Automated Monitoring: Systems using laser ranging, GNSS-RTK positioning, and visual control can track pouring times and mixture placement to prevent cold joint formation . Best Practices: Minimizing the interval between consecutive pours, controlling ambient conditions, and ensuring proper compaction are critical to maintaining joint integrity .
Electrical Cold Shrink Joints
Definition and Advantages: Cold shrink joints are pre-expanded elastomeric materials that shrink around cable connections when the supporting core is removed. Unlike heat shrink joints, they do not require high-temperature equipment, simplifying installation and improving safety . Key Benefits:
- High Efficiency: Quick installation with minimal steps—positioning, wrapping, and core removal—reduces labor and time costs .
- Stability and Durability: Made from silicone rubber or EPDM, these joints resist UV, ozone, moisture, and extreme temperatures (-50°C to 150°C), maintaining dielectric and sealing properties over time .
- Safety: No open flames are required, making them suitable for confined or flammable environments .
- High-Voltage Applications: Designed for power transmission and distribution, ensuring reliable performance under electrical stress .
Conclusion
Achieving high-efficiency and stable cold joints requires a combination of material selection, structural reinforcement, surface treatment, and process control for concrete applications, or advanced elastomeric materials and simplified installation techniques for electrical joints. Implementing these strategies ensures long-term durability, mechanical integrity, and operational safety.
Behaviour and design of cold-formed high strength steel RHS T-joints
Abstract This study presents a comprehensive numerical program aiming to investigate the static resistances of cold
Molecular dynamics study of the shear behavior of concrete cold joints
Abstract A concrete cold joint is a weak interface within structures, and is prone to shear failure. Additionally, as
Enhancing performance of beam-column joints in reinforced concrete
These findings offer new insights into enhancing reinforced concrete joint performance, paving the way for safer, more
Lining cold joint defect formation mechanism and pouring interval
Abstract Cold joints, a prevalent defect in mass concrete casting, pose significant risks to the structural integrity and
Effect of Cold Joint and Its Direction on The
This study would test the compressive and flexural strength due to the effect of cold joint in concrete. The period of the
Shear strength in reinforced concrete beams with cold joint
Abstract Cold joints in reinforced concrete (RC) beams can significantly impact shear behavior, influencing stress distribution and
A thermo-hygro model to determine the factors dictating cold joint
The model provides a time estimate for cold joint formation as a result. It allows us to assess the drying severity for a
Effect of cold joint on strength of concrete | Request PDF
Cold joints that occur in concrete significantly affect the performance and durability, so that further analysis and
(PDF) Mechanical behavior of concrete cold joints
A loss of resistance over 30% for cold concrete cylinders with diagonal joints was found, while concrete cylinders with
Enhancing Cold Joint Shear Strength Prediction in Concrete
AbstractCold joints often appear in precast structures, bridges, and retrofitted buildings, where concrete parts cast at
Concrete Mixture Cold Joint Prevention and Control System
To resolve the issue of cold joints forming in concrete during the construction process, this study has developed a
Combined effect of cold joint and yielded hoop
When tested under cyclic loading, specimens with both cold joint and yielded hoop reinforcement showcased the
Reduce the Influence of Horizontal and Vertical Cold Joints on the
The current research studies the effect of cold joints on the behavior shear and flexure of High Strength Concrete
Experimental Investigation of Cold-Formed High Strength Steel K Joints
AbstractOne of the main challenges in applying high strength steel to tubular structures is appropriate design of the
An experimental and numerical study on the effects of cold joint
Cold joints, formed due to interruptions in the concrete placement process, significantly impact the mechanical behavior
Concrete cold joint formation in hot weather conditions
Cold joint formation becomes more likely in hot weather conditions due to the rapid setting behaviour of the concrete.
The Critical Threat of Cold Joints in Concrete Columns: Ensuring
A cold joint, being a plane of lower density, higher permeability, and reduced bond, provides a pathway for heat and
Molecular dynamics study of the shear behavior of concrete cold joints
Understanding the dynamic characteristics of ions can provide new explanations for phenomena not elucidated by
Cold Joint in Concrete and Methods of Treatment
Reading time: 1 minute A cold joint is an advancing face of a concrete pour, which could not be covered by fresh concrete before
Lining cold joint defect formation mechanism and pouring interval
The results showed that cold joints in the structure deteriorate its bearing performance, and this deterioration
Design of cold-formed high strength steel tubular T-joints under
This study presents a comprehensive finite element (FE) analysis of cold-formed high strength steel (CFHSS) tubular T
(PDF) Mechanical behavior of concrete cold joints
In this paper, the problem of the generation of cold joints is approached from two complementary perspectives.
cold joints Topic
Date: 5/31/2025 Glass Fiber-Reinforced Polymer Bars as Shear-Friction Reinforcement for Concrete Cold Joints
Mechanics‐based model for cold joints in reinforced concrete members
To ensure the integrity of structures with cold joints, it is essential to evaluate the response of cold joints under varying stress profiles
Critical cold joint angle in concrete
In addition to the concrete grades, cold joint angle is also a parameter to be investigated. Zero angle was the control
Progress of high-temperature superconducting joints
However, although high-temperature superconductors offer new possibilities for the practical application of
Cold spot joining of high-strength steel sheets
A novel solid-state joining method, called cold spot joining (CSJ), has been successfully developed. In this method, the
Influence of thermal fatigue cycles on concrete cold joints
To better understand the behaviour of cold joints subjected to these thermal fatigue cycles, an experimental program
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