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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...

Frost Resistant Concrete

Frost Resistant Concrete

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...

Cold Weather Concreting

Cold Weather Concreting

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...

Accelerated Curing of Concrete

Accelerated Curing of Concrete

Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...

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,...

Pumped Concrete

Pumped Concrete

Concrete in large quantities can be pumped across long distances for placing in inaccessible sites. This system comprises a hopper that receives concrete from a mixer, a pump to propel the concrete, and pipelines that facilitate its delivery.
For direct-acting pumps, the concrete enters the pump via the inlet valve under the action of gravity and suction created by the movement of the piston. This concrete is then forced into the pipeline and out through the outlet valve by the forward movement...

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Related Experiment Video

Updated: Aug 1, 2025

Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall

Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall

Published on: January 6, 2023

Study on Road Performance of Polyurethane Cold-Recycled Mixture.

Zhenxia Li^1,2,3, Tengteng Guo^1,2,3, Yuanzhao Chen^1,2,3

¹School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450045, China.

|April 28, 2023

Summary

Polyurethane as a binder in waste asphalt mixtures (PCRM) shows good adhesion and potential for green construction. However, it exhibits poor water stability and reduced performance with increased reclaimed asphalt pavement content.

Keywords:

RAP cold-recycled mixture failure mechanism mix proportion design polyurethane road performance

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Last Updated: Aug 1, 2025

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Area of Science:

Materials Science
Civil Engineering
Sustainable Construction

Background:

Polyurethane offers advantages like room temperature mixing and rapid curing for waste asphalt binder applications.
Utilizing waste asphalt mixtures aligns with green construction principles.

Purpose of the Study:

To evaluate the pavement performance of Polyurethane Cold-Recycled Mixture (PCRM).
To determine the optimal binder ratio and processing conditions for PCRM.
To analyze the pore structure and failure mechanisms of PCRM.

Main Methods:

Adhesion tests evaluated polyurethane binder compatibility with new and old aggregates.
Laboratory tests assessed high-temperature stability, low-temperature crack resistance, water stability, and compressive resilient modulus.
Industrial CT scanning analyzed pore structure and microscopic morphology.

Main Results:

Good adhesion between polyurethane and Reclaimed Asphalt Pavement (RAP) was observed.
Splitting strength increased significantly at a 9% binder-to-aggregate ratio.
Polyurethane binder showed low temperature sensitivity but poor water stability.
Increased RAP content decreased high-temperature stability, low-temperature crack resistance, and modulus, but improved freeze-thaw splitting strength ratio below 40% RAP.

Conclusions:

Polyurethane is a viable binder for waste asphalt recycling, offering processing advantages.
Optimizing RAP content is crucial for balancing performance characteristics.
Further research is needed to address the water stability limitations of polyurethane binders in recycled asphalt mixtures.