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Related Concept Videos

Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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The moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption.
When aggregates are exposed to rain or sit in stockpiles, they absorb moisture, which must be...
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Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
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Correlation between phase separation and rheological behavior in bitumen/SBS/PE blends.

Jianhui Xu1,2, Tian Xia3, Li Zhao3

  • 1College of Polymer Science and Engineering, Sichuan University Chengdu 610065 China.

RSC Advances
|May 13, 2022
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Summary

Adding polyethylene (PE) and styrene-butadiene-styrene (SBS) polymer blends to bitumen enhances its performance. The ratio of PE to SBS in the blend controls phase structure and improves bitumen

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • Bitumen modification enhances road material performance.
  • Polymer blends offer tunable properties for bitumen modification.
  • Immiscibility issues complicate phase structure evolution in bitumen/polymer systems.

Purpose of the Study:

  • Investigate the phase structure evolution of bitumen modified with styrene-butadiene-styrene (SBS) and polyethylene (PE) blends during annealing.
  • Determine the influence of different SBS/PE compositional ratios on phase morphology and rheological behavior.
  • Understand the role of crystalline polymers and elastomers in bitumen modification.

Main Methods:

  • In situ optical microscopy for observing phase structure evolution during annealing.
  • Preparation and characterization of bitumen/SBS/PE blends with varying SBS/PE ratios.
  • Rheological testing to evaluate the impact of phase morphology on bitumen properties.

Main Results:

  • Phase morphology evolution is significantly dependent on the compositional ratio of the SBS/PE blend.
  • The compositional ratio influences the formation and evolution of SBS-rich droplets.
  • Immersion of SBS-rich droplets into the bitumen matrix effectively enhances rheological properties.

Conclusions:

  • The compositional ratio of the polymer blend is critical for controlling phase structure and optimizing bitumen rheology.
  • SBS/PE blends offer a viable route to enhance bitumen's complex modulus and viscosity.
  • Understanding phase evolution is key to designing high-performance bitumen modifiers.