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Related Concept Videos

Pore Size Distribution01:23

Pore Size Distribution

602
In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
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Testing Water Quality01:14

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When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
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Related Experiment Video

Updated: Mar 29, 2026

Sediment Core Sectioning and Extraction of Pore Waters under Anoxic Conditions
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Pore Water Collection, Analysis and Evolution: The Need for Standardization.

Jacob G Gruzalski1, James T Markwiese2, Neil E Carriker3

  • 1Environmental Standards, Inc, 8331 E. Walker Springs Lane, Suite 402, Knoxville, TN, 37923, USA. jgruzalski@envstd.com.

Reviews of Environmental Contamination and Toxicology
|November 29, 2015
PubMed
Summary
This summary is machine-generated.

Standardizing pore water collection is crucial for accurate aquatic ecosystem assessments. Current methods risk altering sample integrity, leading to unreliable ecological impact evaluations of environmental contaminants.

Keywords:
BioavailabilityBiotic ligand modelInterstitial waterInterstitial water toxicity unitsPore water

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Area of Science:

  • Environmental Science
  • Ecotoxicology
  • Aquatic Chemistry

Background:

  • Interstitial water analysis is key for estimating benthic exposure in aquatic environments.
  • Current pore water collection methods lack standardization, potentially altering in-situ geochemical conditions.
  • There's a lack of established ecological or human health benchmarks for evaluating pore water contaminant toxicity.

Purpose of the Study:

  • To highlight the need for standardized pore water collection and data evaluation methods.
  • To emphasize the importance of maintaining sample integrity during pore water analysis.
  • To address the limitations in assessing the ecological impacts of contaminants in aquatic ecosystems.

Main Methods:

  • Review of current practices in interstitial water sample collection and analysis.
  • Discussion of geochemical transformations due to atmospheric exposure during sampling.
  • Evaluation of existing data limitations and the need for empirical toxicity data.

Main Results:

  • Pore water data integrity is compromised by non-standardized collection and processing techniques.
  • Inappropriate criteria are often used to evaluate pore water data due to a lack of benchmarks.
  • Bioavailability of trace elements and contaminant partitioning require consideration for accurate data interpretation.

Conclusions:

  • Standardized protocols for sediment and pore water collection are urgently needed.
  • Collaboration between sediment researchers and regulatory agencies is essential for developing guidelines.
  • Lack of standardization leads to the proliferation of varied techniques and the use of questionable data evaluation criteria.