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Related Concept Videos

Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

323
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...
323
Superplasticizers01:30

Superplasticizers

301
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
301
Accelerators01:17

Accelerators

265
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...
265
Effects of Air-entrainment in Concrete01:28

Effects of Air-entrainment in Concrete

367
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...
367
Retarders01:19

Retarders

253
Retarders are chemical admixtures designed to extend the setting time, which is especially useful when there is a delay in sequential concrete pours to prevent cold joints and to achieve a cohesive structure. Retarders, when used in appropriate amounts, can also enhance the architectural appearance of exposed aggregate finishes.
The function of retarders is to delay the setting of concrete, and this effect can be measured using a penetration test. The retardation process involves adding...
253
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

294
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.
294

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Updated: Jan 13, 2026

Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight
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Synergistic Effects of High-Modulus Additives on SBS-Modified Asphalt: Microstructural, Rheological Enhancement, and

Qinghua He1,2, Zhuosen Li1, Jianqi Huang2

  • 1School of Highway, Chang'an University, Xi'an 710061, China.

Materials (Basel, Switzerland)
|October 29, 2025
PubMed
Summary

Two high-modulus additives enhance SBS-modified asphalt

Keywords:
SBS-modified asphaltcomposite modificationhigh-modulus asphalthigh-temperature performancethreshold

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Area of Science:

  • Materials Science
  • Civil Engineering

Background:

  • Styrene-butadiene-styrene (SBS)-modified asphalt is crucial for durable pavements.
  • Optimizing additive synergy is key to improving asphalt performance.
  • Understanding microstructure-performance relationships is essential for material design.

Purpose of the Study:

  • To investigate the synergistic effects of two high-modulus additives on SBS-modified asphalt.
  • To characterize microstructural changes and evaluate performance enhancements.
  • To determine optimal additive dosages and their impact on various performance metrics.

Main Methods:

  • Fluorescence microscopy for microstructural analysis.
  • Rheological tests to assess high-temperature performance (complex modulus, rutting factor).
  • Multiple Stress Creep Recovery (MSCR) tests for elastic recovery and creep compliance.
  • Penetration tests to evaluate low-temperature properties.

Main Results:

  • Additives form an interconnected network via phase separation, swelling over time.
  • Optimal dosage (10 wt%) significantly boosts complex modulus (~215%) and rutting factor (~300%).
  • Enhanced elastic recovery and reduced non-recoverable creep compliance observed.
  • Low-temperature ductility is negatively impacted, with HMA-B showing greater penetration decrease and lower toughness than HMA-A.
  • 10% dosage is a critical threshold for balancing rutting resistance and low-temperature performance.

Conclusions:

  • Synergistic modification with high-modulus additives effectively enhances high-temperature performance of SBS-modified asphalt.
  • A critical dosage of 10% maximizes rutting resistance while managing low-temperature degradation.
  • HMA-B is recommended for high-stress conditions, while HMA-A is suitable for variable temperature environments.
  • An integrated "microstructure-performance-dosage" design paradigm is proposed for optimized asphalt modification.