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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,...

Electrophilic Aromatic Substitution: Sulfonation of Benzene

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Accelerators

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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.
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Pozzolans

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Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
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Sulfate attack on concrete is a deterioration process characterized by a whitish discoloration beginning at the edges and corners, accompanied by cracking and spalling. This phenomenon occurs when sulfates react with the components of hardened concrete, forming compounds like calcium sulfate and calcium sulfoaluminate which occupy more space than the substances they replace, causing the concrete to expand and disrupt.
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Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.

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

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Activated Desulfurized Rubber Powder/SBS/SEBS Composite-Modified Asphalt: Performance and Synergistic Modification

Qidong Su¹, Songqiao Yang², Wenjing Liu³

¹Research Institute of Highway Ministry of Transport, Beijing 100088, China.

|December 11, 2025

Summary

This summary is machine-generated.

This study introduces activated desulfurized rubber powder/SEBS/SBS composite-modified asphalt (ASSA) for improved road performance. ASSA offers enhanced stability, crack resistance, and deformation resistance for durable highways.

Keywords:

SBS SEBS mechanism analysis modified asphalt rheological properties rubber-modified asphalt sustainability

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Area of Science:

Materials Science
Civil Engineering
Polymer Chemistry

Background:

Traditional rubber powder-modified asphalt (RA) has limited application in high-grade highways due to poor performance and segregation issues.
Existing rubber powder/Styrene-Butadiene-Styrene (SBS) modified asphalt faces challenges with stability and comprehensive performance.

Purpose of the Study:

To investigate the effect of a novel SEBS/SBS (SE-S) system on asphalt performance.
To develop and evaluate activated desulfurized rubber powder/SE-S composite-modified asphalt (ASSA) for enhanced road applications.
To understand the modification mechanism and compatibility of ASSA.

Main Methods:

Preparation of SEBS/SBS (SE-S) blend and activated desulfurized rubber powder (ARP).
Production of ARP/SE-S composite-modified asphalt (ASSA).
Evaluation using conventional, rheological, and microstructural tests.

Main Results:

SEBS demonstrated superior storage stability compared to SBS.
Optimal performance was achieved with a SEBS:SBS ratio of 0.4:0.6 and 2-4% SE-S content.
ASSA exhibited enhanced low-temperature crack resistance and high-temperature deformation resistance, with excellent viscoelastic properties.

Conclusions:

The synergy between ARP and SE-S significantly improves asphalt performance.
ASSA shows excellent compatibility, stability, and overall performance due to full swelling and crosslinking.
The modification mechanism is primarily physical, with chemical bond changes attributed to rubber powder decrosslinking during ARP preparation.