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Moisture Content and Bulking of Aggregate

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...

Specific Gravity of Aggregate

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...

Porosity and Absorption of Aggregate

Porosity and Absorption of Aggregate

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...

Bulk Density of Aggregate

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,...

Bonding and Strength of Aggregate

Bonding and Strength of Aggregate

The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...

Aggregate Cement Ratio

Aggregate Cement Ratio

The Aggregate Cement ratio refers to the weight of aggregate divided by the weight of cement in a concrete mix. Altering this ratio has profound effects on the concrete's properties. This ratio plays a pivotal role in determining the strength, workability, and durability of concrete. When the Aggregate Cement ratio is higher, the mix is leaner, meaning it has less cement paste to lubricate the aggregate, potentially making the concrete less workable. Such mixes, known as lean, enhance the...

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Related Experiment Video

Updated: Apr 1, 2026

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

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Published on: February 22, 2018

Simple Statistical Model for Branched Aggregates: Application to Cooee Bitumen.

Claire A Lemarchand¹, Jesper S Hansen¹

¹DNRF Centre "Glass and Time", IMFUFA, Department of Sciences, Roskilde University , Universitetsvej 1, Postbox 260, DK-4000 Roskilde, Denmark.

The Journal of Physical Chemistry. B

|October 13, 2015

Summary

This summary is machine-generated.

We developed a statistical model to predict the size distribution of branched aggregates like asphaltene nanoaggregates. This model uses conditional probabilities and shows good agreement with molecular dynamics simulations.

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Last Updated: Apr 1, 2026

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Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture

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Published on: May 13, 2018

Area of Science:

Chemical Physics
Materials Science
Computational Chemistry

Background:

Branched aggregates, such as asphaltene nanoaggregates, exhibit complex size distributions.
Understanding aggregate formation is crucial in fields ranging from polymer science to petroleum engineering.

Purpose of the Study:

To propose a novel statistical model for predicting the size distribution of branched aggregates.
To apply and validate this model using asphaltene nanoaggregates from molecular dynamics simulations.

Main Methods:

Development of a statistical model based on conditional probabilities of molecular bonding.
Application of the model to asphaltene nanoaggregates simulated using molecular dynamics.
Analysis of temperature-dependent probabilities using statistical mechanics principles.

Main Results:

The statistical model successfully reproduces the size distribution of various branched aggregates.
The model's predictions for asphaltene nanoaggregates show satisfactory agreement with simulation data.
Temperature variations in bonding probabilities were analyzed and linked to statistical mechanics.

Conclusions:

The proposed statistical model offers a robust method for characterizing branched aggregate size distributions.
The model provides insights into the molecular interactions governing asphaltene nanoaggregate formation.
This approach has broad applicability to diverse branched molecular systems.