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Impact Strength of Concrete01:21

Impact Strength of Concrete

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Impact strength in concrete is a critical measure that reflects the material's capability to endure the forces applied during pile driving and when supporting machinery foundations that experience impulsive loads. It is also essential when handling precast concrete components to prevent accidental damage. The impact strength is assessed by observing the concrete's resistance to repeated impacts and energy absorption capacity. A key indicator of significant damage to concrete is when it...
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Impact Loading01:19

Impact Loading

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Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
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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...
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Pumped Concrete01:13

Pumped Concrete

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Concrete in large quantities can be pumped across long distances for placing in inaccessible sites. This system comprises a hopper that receives concrete from a mixer, a pump to propel the concrete, and pipelines that facilitate its delivery.
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Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

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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.
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Concrete exposed to seawater can undergo degradation like the dissolution of ettringite and gypsum, increasing the material's porosity and decreasing its strength. In contrast, the crystallization of salts within the concrete's pores can cause expansion, particularly above the waterline where evaporation occurs. Nonetheless, this expansion only happens when seawater, enabled by the concrete's permeability, manages to infiltrate the structure.
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Fabrication of Soft Pneumatic Network Actuators with Oblique Chambers
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Enhanced boxing punch impact with silicone cushioning.

Sirichet Punthipayanon1,2, Supranee Kwanboonchan3, Pornthep Rachanavy4

  • 1Laboratory of Exercise Biochemistry, Institute of Sports Science, University of Taipei, Taipei, Taiwan.

Frontiers in Sports and Active Living
|August 23, 2024
PubMed
Summary

Elastic cushioning, like silicone wraps, enhances punch force delivery in boxers by reducing wasted energy. This material allows for better impact with increased contact time, protecting tissue without compromising performance.

Keywords:
International Boxing Associationbiomechanicalboxercombat sports, impactelastic materialsforcepunching glove

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Area of Science:

  • Sports Science
  • Biomechanics
  • Materials Science

Background:

  • Elastic cushioning materials absorb impact energy to protect tissues.
  • The effect of such cushioning on force delivery to a target is not well understood.

Purpose of the Study:

  • To investigate whether silicone cushioning in hand wraps affects punch force delivery in elite boxers.
  • To compare force dissipation and impact characteristics between silicone and traditional gauze hand wraps.

Main Methods:

  • A double-blind crossover trial involving 12 elite boxers was conducted.
  • Boxers delivered maximal punches using either silicone or gauze hand wraps.
  • Force distribution, total force production, force wastage, and contact time were measured.

Main Results:

  • Silicone hand wraps resulted in higher total force production (436 N vs. 372 N) compared to gauze wraps.
  • Force wastage was significantly lower with silicone (2.0%) than gauze (3.8%).
  • Contact time increased from 35 ms to 50 ms with silicone wraps.

Conclusions:

  • Elastic cushioning, specifically silicone, does not compromise punch force delivery.
  • Silicone cushioning may enhance impact by allowing more time for optimal fist-target alignment.