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Related Concept Videos

Bulk Density of Aggregate01:22

Bulk Density of Aggregate

Bulk density refers to the mass of aggregate particles that would fill a unit volume. The concept of bulk density originates from the inability to pack aggregate particles in a manner that completely eliminates void spaces. Hence, the term bulk refers to the volume that encompasses both the aggregates and the voids. This measurement is crucial when aggregates are batched by volume and is used to convert quantities by mass to volume.
Most natural mineral aggregates, like sand and gravel,...
Specific Gravity of Aggregate01:19

Specific Gravity of Aggregate

Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
Compacting Factor test01:22

Compacting Factor test

The compacting factor test is a method used to assess the workability of concrete. It is  especially suitable for concrete mixes containing aggregates up to one and a half inches in size. This test involves specialized equipment consisting of two truncated cone-shaped hoppers and a cylinder, all with polished interior surfaces to minimize friction.
The procedure begins by placing concrete into the upper hopper without any compaction. Once filled, the bottom door of this hopper is opened,...
Density00:56

Density

Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
Moisture Content and Bulking of Aggregate01:10

Moisture Content and Bulking of Aggregate

The moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption.
When aggregates are exposed to rain or sit in stockpiles, they absorb moisture, which must be...
Microbial Growth Measurement: Indirect Methods01:27

Microbial Growth Measurement: Indirect Methods

Estimating microbial growth is essential for understanding population dynamics and environmental adaptations. Indirect methods provide valuable insights by measuring parameters such as turbidity, metabolic activity, and biomass, enabling efficient and reproducible assessments.During exponential growth, microbial cells scatter light proportionally to their biomass, a principle used in turbidity measurements. About one million cells per milliliter produce detectable scattering, which a...

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Updated: Jun 20, 2026

Utilizing Soil Density Fractionation to Separate Distinct Soil Carbon Pools
09:19

Utilizing Soil Density Fractionation to Separate Distinct Soil Carbon Pools

Published on: December 16, 2022

Bulk density determination as a simple and complementary tool in composting process control.

Oscar Huerta-Pujol1, Montserrat Soliva, F Xavier Martínez-Farré

  • 1Department of Agri-Food Engineering and Biotechnology, Escola Superior d'Agricultura de Barcelona, Universitat Politècnica de Catalunya, 08860 Castelldefels, Spain. oscar.huerta@upc.edu

Bioresource Technology
|September 25, 2009
PubMed
Summary
This summary is machine-generated.

Bulk density can monitor composting process development and infer organic matter loss. This study found bulk density increases as total organic matter decreases during composting of municipal solid waste.

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Last Updated: Jun 20, 2026

Utilizing Soil Density Fractionation to Separate Distinct Soil Carbon Pools
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Published on: December 16, 2022

Blast Quantification Using Hopkinson Pressure Bars
09:41

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Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions
08:38

Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions

Published on: February 15, 2019

Area of Science:

  • Environmental Science
  • Waste Management
  • Biotechnology

Background:

  • Composting is crucial for managing municipal solid waste (MSW).
  • Monitoring the composting process (CP) is essential for efficiency.
  • Bulk density is a potential, yet underutilized, indicator for CP.

Purpose of the Study:

  • To investigate the relationship between bulk density and composting process development.
  • To assess bulk density as a tool for evaluating composting efficiency.
  • To explore the correlation between bulk density and total organic matter loss in reject materials.

Main Methods:

  • Sampling of 114 materials from 10 composting facilities treating the organic fraction of MSW.
  • Analysis of total organic matter (TOM), moisture content (MC), and dry basis bulk density (BDd).
  • Statistical analysis to determine differences and correlations between parameters at various CP stages.

Main Results:

  • Significant differences in MC, TOM, and BDd were observed across different composting stages.
  • Dry basis bulk density (BDd) increased, while total organic matter (TOM) decreased throughout the composting process.
  • A significant negative correlation was found between TOM and BDd, indicating biological activity and organic matter loss.

Conclusions:

  • Bulk density serves as a simple and effective tool for evaluating composting process development.
  • Dry basis bulk density (BDd) can be used to estimate total organic matter (TOM) loss, particularly in reject materials.
  • Integrating bulk density measurements can enhance the monitoring of composting operations.