Mechanical properties and acoustic emission characteristics of basalt fiber reinforced cemented silty sand subjected to freeze-thaw cycles
These videos have been matched automatically. Contact us if they are not relevant.
These videos have been matched automatically. Contact us if they are not relevant.
View abstract on PubMed
Summary
This summary is machine-generated.Freeze-thaw cycles significantly degrade fiber-reinforced cemented silty sand
Area Of Science
- Geotechnical Engineering
- Material Science
Background
- Freeze-thaw (F-T) cycling critically impacts soil mechanical properties in seasonally frozen regions.
- Subgrade engineering requires understanding soil behavior under F-T conditions.
Purpose Of The Study
- To investigate the influence of fiber content, length, curing time, and F-T cycles on the unconfined compressive strength (UCS) of fiber-reinforced cemented silty sand.
- To analyze acoustic emission (AE) characteristic parameters to understand F-T-induced damage progression.
Main Methods
- Unconfined compressive strength (UCS) tests were performed on fiber-reinforced cemented silty sand specimens.
- Acoustic emission (AE) testing was used to monitor material damage during F-T cycles.
- AE parameters like cumulative ring count, cumulative energy, and amplitude were analyzed.
Main Results
- Optimal fiber content for UCS was found to be 0.2%.
- UCS decreased with increased fiber length and F-T cycles, stabilizing after 6-10 cycles, with ~30% strength loss.
- AE parameters correlated with damage stages, identifying critical failure points and providing early warning signals.
Conclusions
- Fiber reinforcement and curing time influence UCS, but F-T cycles cause significant strength degradation.
- AE testing effectively characterizes F-T damage progression in fiber-reinforced cemented silty sand.
- Specific AE parameters can serve as indicators for critical failure and impending damage.
These videos have been matched automatically. Contact us if they are not relevant.
These videos have been matched automatically. Contact us if they are not relevant.
Related Concept Videos
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...
Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
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...
Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
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...