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Related Concept Videos

Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

121
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
121
Frost Resistant Concrete01:29

Frost Resistant Concrete

135
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...
135
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

127
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
127
Cold Weather Concreting01:27

Cold Weather Concreting

111
When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
To counteract the negative impacts of cold weather, ensuring...
111
Frost Action on Concrete01:27

Frost Action on Concrete

149
Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the concrete.
This freeze-thaw cycle primarily causes surface scaling, where...
149
Accelerators01:17

Accelerators

110
Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
The effectiveness of calcium chloride can...
110

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Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight
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Study on the Filler Composition Optimization and Performance Evaluation of Cold-Patch Asphalt Mixture.

Congwei Bi1, Xueqi Wang2, Jikai Fu1

  • 1Shandong Hi-Speed Infrastructure Construction Co., Ltd., Jinan 250098, China.

Materials (Basel, Switzerland)
|August 28, 2025
PubMed
Summary

Optimizing filler composition in cold-patched asphalt (CPA) mixtures enhances performance. A specific bentonite-to-cement ratio and mineral powder substitution significantly improve strength and stability.

Keywords:
cold-patched asphalt slurryfiller ratiomixture proportion optimizationsolvent-based cold-patched asphalt mixtures

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Road Construction

Background:

  • Filler properties critically influence cold-patched asphalt (CPA) slurry rheology and mechanical characteristics.
  • The performance of cold-patch asphalt mixtures (CPAM) is directly impacted by filler composition.

Purpose of the Study:

  • To optimize the filler composition ratio for cold-patch asphalt mixtures (CPAM).
  • To determine the ideal ratio of bentonite to cement when partially substituting mineral powder.

Main Methods:

  • An orthogonal test design was employed to systematically vary filler compositions.
  • Performance verification tests were conducted on the optimized CPAM.
  • Scanning electron microscopy (SEM) was used to analyze filler dispersion and reaction mechanisms.

Main Results:

  • The optimal filler composition was identified as 4.3% total dosage, 50% mineral powder replacement, and a bentonite-to-cement ratio of 0.2:1.
  • Forming strength increased by 7.37%, residual stability by 20.95%, and freeze-thaw splitting strength by 17.13%.
  • Water stability was significantly enhanced, with SEM confirming cement and bentonite dispersion and hydration reactions.

Conclusions:

  • The optimized filler ratio significantly improves the mechanical properties and durability of cold-patch asphalt mixtures.
  • The study elucidates the micro-mechanisms behind performance enhancement through filler optimization.