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Related Concept Videos

Microcracking in Concrete01:20

Microcracking in Concrete

116
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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Unsoundness of Aggregate due to Volume Change01:26

Unsoundness of Aggregate due to Volume Change

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Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
106

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Updated: Jun 23, 2025

Separation and Identification of Conventional Microplastics from Farmland Soils
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Microplastics alter soil structural stability as quantified by high-energy moisture characteristics.

Nasrollah Sepehrnia1, Cecile Gubry-Rangin1, Yukie Tanino2

  • 1School of Biological Sciences, University of Aberdeen, Aberdeen, UK.

Journal of Hazardous Materials
|June 20, 2024
PubMed
Summary

Microplastics (MiPs) negatively impact soil structure by altering pore distribution and water retention. Higher concentrations and larger fiber sizes significantly affect soil hydraulic properties, compromising soil health.

Keywords:
Aggregate stabilityEnvironmental pollutionSoil microplasticsWater flowWetting and drying cycles

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Area of Science:

  • Environmental Science
  • Soil Science
  • Materials Science

Background:

  • Microplastics (MiPs) are emerging soil contaminants with potential to alter soil structural stability.
  • The influence of MiPs on soil properties depends on their characteristics like chemistry, concentration, size, and degradation.
  • Understanding these impacts is crucial for soil health and ecosystem functioning.

Purpose of the Study:

  • To quantify the effects of microplastic properties on soil structural stability using high-energy moisture characteristics (HEMC).
  • To investigate how polypropylene (PP) and polyethylene (PE) microplastics influence soil pore distribution and water retention.
  • To assess the impact of microplastic concentration and size on soil hydraulic properties.

Main Methods:

  • Soil samples contaminated with varying concentrations and sizes of PP and PE microplastics were analyzed.
  • High-energy moisture characteristics (HEMC) were used to measure water retention at matric suctions from 0 to 50 hPa.
  • HEMC data were modeled to quantify changes in drainable pore volume (VDP) and modal matric suction (h_modal).

Main Results:

  • Increased microplastic concentrations (2% and 7%) significantly increased the volume of drainable pores (VDP).
  • Larger microplastic fibers (3-5 mm) at lower concentrations (0.5-1%) showed higher VDP compared to smaller fibers (1.6 mm).
  • Both PE and PP microplastics increased modal matric suction (h_modal), with effects more pronounced under fast wetting conditions.

Conclusions:

  • Microplastics detrimentally impact soil aggregates and pores, significantly altering HEMC parameters and soil hydraulic properties.
  • MiPs affect soil's water retention and supply capabilities, compromising overall soil health and productivity.
  • Characterizing microplastic impacts on soil structure is essential for developing strategies to mitigate pollution effects.