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Microcracking in Concrete

Microcracking in Concrete

Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...

Abrasion Resistance of Concrete

Abrasion Resistance of Concrete

Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...

Types of Non-structural Cracks in Concrete

Types of Non-structural Cracks in Concrete

Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.

Stress-Strain Diagram - Ductile Materials

Stress-Strain Diagram - Ductile Materials

The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...

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...

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Related Experiment Video

Updated: Mar 3, 2026

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics

Published on: September 28, 2016

Local Structural Damage Evaluation of a C/C-SiC Ceramic Matrix Composite.

Benedicta D Arhatari¹, Matthew Zonneveldt², John Thornton²

¹1ARC Centre of Excellence in Advanced Molecular Imaging,Department of Chemistry and Physics,La Trobe Institute for Molecular Science,La Trobe University,Bundoora,VIC 3086,Australia.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada

|April 25, 2017

Summary

Carbon fiber-reinforced ceramic matrix composites (C/C-SiC CMCs) exhibit enhanced toughness due to fiber bridging, which slows crack propagation. Silicon carbide distribution also influences material toughness.

Keywords:

X-rays composite mechanical test microstructure tomography

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Published on: December 20, 2024

Area of Science:

Materials Science
Mechanical Engineering
Composite Materials

Background:

Ceramic matrix composites (CMCs) offer high strength and temperature resistance.
Carbon fiber-reinforced silicon carbide (C/C-SiC) composites are known for oxidation resistance.
Understanding failure mechanisms is crucial for structural applications.

Purpose of the Study:

To investigate the mechanical failure behavior of C/C-SiC composites.
To correlate microstructural features with macroscopic mechanical response.
To elucidate the role of fiber bridging and matrix composition in toughness.

Main Methods:

Four-point bending tests were conducted to apply mechanical stress.
In-situ X-ray radiography was used to observe crack propagation.
Load/displacement data was correlated with radiographic observations.

Main Results:

Fiber bundles were observed to significantly impede crack propagation.
Energy dissipation through fiber breakage and pull-out contributes to toughness.
Local silicon carbide distribution and concentration negatively impact material toughness.

Conclusions:

Fiber bridging is a key toughening mechanism in C/C-SiC composites.
The distribution of silicon carbide within the matrix is critical for controlling fracture toughness.
These findings inform the design of advanced CMCs for demanding applications.