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Accelerated Curing of Concrete

Accelerated Curing of Concrete

Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...

Curing of Concrete

Curing of Concrete

The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...

Fiber Reinforced Concrete

Fiber Reinforced Concrete

Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...

Vibrating Concrete

Vibrating Concrete

Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...

Curing Methods

Curing Methods

Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...

Frost Resistant Concrete

Frost Resistant Concrete

Concrete's susceptibility to frost damage during freeze-thaw cycles demands strategic measures to enhance its frost resistance. Employing techniques like air entrainment, adjusting the water-cement ratio, proper curing, and selecting appropriate aggregates are essential.
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of entrained...

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Related Experiment Video

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Measuring the Mechanical Properties of Glass Fiber Reinforcement Polymer Composite Laminates Obtained by Different Fabrication Processes

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Published on: June 30, 2023

Void Suppression Method of CFRP Variable-Thickness Structure Components by Vibration-Assisted Curing Process.

Shunming Yao¹, Lihua Zhan², Chenglong Guan³

¹College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.

|May 27, 2026

Summary

This summary is machine-generated.

A novel vibration-assisted double vacuum bag process enhances composite manufacturing. This method effectively reduces voids in variable-thickness components, improving performance and ensuring high-quality curing.

Keywords:

CFRP out-of-autoclave variable-thickness structure vibration-assisted curing process voids suppression

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Magnet Assisted Composite Manufacturing: A Flexible New Technique for Achieving High Consolidation Pressure in Vacuum Bag/Lay-Up Processes

Published on: May 17, 2018

Area of Science:

Materials Science
Composite Manufacturing
Mechanical Engineering

Background:

Variable-thickness composite components face challenges during curing due to pressure transfer issues.
Abrupt thickness changes can lead to void defects, compromising component performance.

Purpose of the Study:

To introduce and evaluate a mechanical vibration-assisted double vacuum bag process.
To investigate the effects of vibration, vacuum, and their synergy on void characteristics and mechanical properties of variable-thickness composites.

Main Methods:

Finite element analysis of vibration energy fields in saturated porous composites.
Curing experiments for variable-thickness specimens.
Microscopic characterization and mechanical testing to analyze void characteristics and properties.

Main Results:

Vibration facilitates gas discharge and accelerates resin flow.
The double vacuum bag process, with delayed vacuum application, reduces early-stage gas discharge resistance but can limit resin flow.
Synergistic optimization of vibration and the double vacuum bag process significantly suppressed voids, reducing macroscopic porosity from 8.34% to 0.43%.

Conclusions:

The proposed vibration-assisted double vacuum bag process effectively suppresses gas-induced and flow-induced voids.
This method ensures curing efficiency while improving the quality of variable-thickness composite components.
A new approach for high-quality manufacturing of variable-thickness composites is presented.