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Porosity and Absorption of Aggregate01:20

Porosity and Absorption of Aggregate

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Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
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Optimizing Inorganic Carbon Sequestration and Crop Yield With Wollastonite Soil Amendment in a Microplot Study.

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Adding wollastonite to agricultural soils enhances crop yield for soybean and alfalfa while sequestering atmospheric carbon dioxide (CO2) as inorganic carbon through mineral carbonation. This study demonstrates wollastonite

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Geochemistry

Background:

  • Rising atmospheric carbon dioxide (CO2) necessitates effective greenhouse gas mitigation strategies.
  • Agricultural soils represent a significant natural sink for CO2 sequestration.
  • Mineral carbonation via soil amendments offers a promising route for atmospheric CO2 removal.

Purpose of the Study:

  • To evaluate the impact of wollastonite soil amendment on soybean and alfalfa growth performance across various dosages.
  • To investigate the enhanced weathering of wollastonite in soil and its effect on inorganic carbon content.
  • To quantify the CO2 sequestration rate achievable through wollastonite application in agricultural soils.

Main Methods:

  • Microplot experiment conducted in Ontario, Canada, over 14 weeks.
  • Application of diverse wollastonite dosages (3–40 kg·m-2) to soybean and alfalfa plots.
  • Mineralogical assessment using X-ray diffraction (XRD) and Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDS).

Main Results:

  • Wollastonite application significantly increased soybean yield (two-fold at 10 kg·m-2) and alfalfa growth (height, biomass).
  • CO2 sequestration rates reached up to 0.08 kg CO2·m-2·month-1 at optimal wollastonite dosages.
  • XRD and SEM-EDS confirmed wollastonite weathering, calcite accumulation, and formation of other mineral weathering products in amended soils.

Conclusions:

  • Wollastonite serves as an effective soil amendment for enhancing crop yield and sequestering atmospheric CO2.
  • Mineral carbonation of wollastonite in agricultural soils represents a viable negative emissions technology.
  • Findings support the implementation of wollastonite for climate change mitigation and improved agricultural productivity.