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Deleterious Substances in Aggregate01:25

Deleterious Substances in Aggregate

250
Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
250
Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

193
The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
193

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Related Experiment Video

Updated: Sep 12, 2025

Methods of Soil Resampling to Monitor Changes in the Chemical Concentrations of Forest Soils
09:16

Methods of Soil Resampling to Monitor Changes in the Chemical Concentrations of Forest Soils

Published on: November 25, 2016

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Post-fire soil hazards: recommendations for updated soil testing protocols and clearance thresholds.

Joseph G Allen1, Parham Azimi2, Gen Pei2

  • 1Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, MA, USA. jgallen@hsph.harvard.edu.

Journal of Exposure Science & Environmental Epidemiology
|August 8, 2025
PubMed
Summary

Urban wildfires in Los Angeles increase soil lead exposure risks for children. Current cleanup methods are insufficient, necessitating mandatory post-remediation soil testing and a lower lead standard to protect public health.

Keywords:
Child Exposure/HealthMetalsPersonal ExposureWildfires

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Area of Science:

  • Environmental Health
  • Toxicology
  • Urban Planning

Background:

  • Urban wildfires in Los Angeles elevate soil lead exposure risks, particularly for children.
  • Existing post-wildfire soil remediation protocols may not adequately safeguard public health in affected communities.

Purpose of the Study:

  • To assess the effectiveness of current soil remediation practices following urban wildfires in Los Angeles.
  • To propose policy recommendations aimed at mitigating lead exposure risks.

Main Methods:

  • Review of California's wildfire debris removal protocols, soil testing procedures, and lead exposure health benchmarks.
  • Analysis of recent post-fire soil testing data and the scientific basis for California's Preliminary Remediation Goal (PRG) for lead.

Main Results:

  • Over 20% of properties exceed lead thresholds even after remediation, indicating protocol inadequacy.
  • California's current residential soil lead PRG of 80 mg/kg is not health-protective, lacking adherence to toxicity benchmarks and current scientific understanding of child lead exposure risks.

Conclusions:

  • Critical gaps exist in post-wildfire remediation, leaving Los Angeles residents, especially children, vulnerable to lead exposure.
  • Policy reforms, including mandatory confirmatory soil testing and a reduced PRG to 55 mg/kg, are essential for enhanced environmental health protection.
  • Implementing these measures offers a safer future for communities impacted by escalating urban wildfire threats.