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Accelerators

Accelerators

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...

Superplasticizers

Superplasticizers

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,...

Abrasion Resistance of Concrete

Abrasion Resistance of Concrete

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...

Effects of Air-entrainment in Concrete

Effects of Air-entrainment in Concrete

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...

Retarders

Retarders

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...

Microcracking in Concrete

Microcracking in Concrete

Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...

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Related Experiment Video

Updated: Jun 27, 2026

Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight

Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight

Published on: May 31, 2022

Enhancing Asphalt Performance with CR/SBS Pellet: A Multiscale Investigation from Performance Characterization to

Wen Li¹, Zenggang Zhao¹, Wei Li¹

¹School of Civil Engineering, Central South University of Forestry & Technology, Changsha 410004, China.

|June 26, 2026

Summary

This summary is machine-generated.

Novel crumb rubber (CR)/SBS-polymerized pellets enhance asphalt performance by improving physical properties, rheological behavior, and aging resistance. These pellets offer a simplified modification process for advanced asphalt materials.

Keywords:

modification mechanism modified asphalt physical properties polymerized pellets rheological properties

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Area of Science:

Materials Science
Civil Engineering
Polymer Science

Background:

Traditional asphalt modification is complex.
The effectiveness of novel crumb rubber (CR)/styrene-butadiene-styrene (SBS)-polymerized pellets in asphalt modification requires validation.
CR/SBS-polymerized pellets offer a simplified approach to composite-modified asphalt preparation.

Purpose of the Study:

To investigate the performance and reinforcement mechanism of polymerized pellet-modified asphalt.
To evaluate the impact of varying CR/SBS pellet content on asphalt properties.
To compare the performance of pellet-modified asphalt with base asphalt and commercial SBS-modified asphalt.

Main Methods:

Preparation of modified asphalt samples with 10-40% CR/SBS pellets.
Systematic evaluation of physical properties, rheological behavior, thermal stability, and aging resistance.
Mechanism exploration using Fourier transform infrared spectroscopy (FTIR) and fluorescence microscopy (FM).

Main Results:

CR/SBS pellets decreased asphalt penetration, elevated softening point, and enhanced viscosity.
High- and low-temperature performance and aging resistance of modified asphalt were significantly improved.
Performance enhancement increased with pellet content; 20-30% pellet modification performance was comparable to commercial SBS modification.

Conclusions:

CR/SBS-polymerized pellets effectively improve asphalt performance.
The modification process is primarily physical mixing.
This study provides a scientific basis for the engineering application of CR/SBS pellets in asphalt modification.