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Strength and Heat of Hydration

Strength and Heat of Hydration

The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...

Setting Time of Cement

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The setting time of cement refers to the process of cement paste transitioning from a plastic state to a solid state. This process is crucial in construction as it dictates the timeframe for concrete placement, compaction, and finishing. The onset of this solidification is termed the initial set, indicating when the paste becomes unworkable. The final set is when the paste has solidified completely, and further handling or manipulation can no longer affect its shape. The cement strength is...

Strength of Cement

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Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
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Porosity in Cement Paste

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The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
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Pore Size Distribution

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Related Experiment Video

Updated: Jul 13, 2026

Detecting the Water-soluble Chloride Distribution of Cement Paste in a High-precision Way

Detecting the Water-soluble Chloride Distribution of Cement Paste in a High-precision Way

Published on: November 21, 2017

Onset of cohesion in cement paste.

B Jönsson¹, H Wennerström, A Nonat

¹Theoretical Chemistry, Chemical Center, Lund University, POB 124, S-221 00 Lund, Sweden.

Langmuir : the ACS Journal of Surfaces and Colloids

|July 28, 2004

Summary

A new model explains how calcium-silicate-hydrate (C-S-H) nanoparticles form a cohesive network in cement paste. It reveals ionic interactions cause attraction between C-S-H particles, explaining cement

Area of Science:

Materials Science
Physical Chemistry
Colloid Science

Background:

Cement paste cohesion relies on calcium-silicate-hydrate (C-S-H) nanoparticle networks.
The precise mechanism of C-S-H particle cohesion remains unclear.

Purpose of the Study:

To propose and validate a dielectric continuum model for C-S-H particle interactions.
To elucidate the ionic mechanisms underlying cement paste cohesion.

Main Methods:

Developed a dielectric continuum model incorporating explicit co-ion and counterion interactions.
Simulated ionic interactions between C-S-H particles, including Coulombic forces.
Compared model predictions with Atomic Force Microscopy (AFM) experimental data.

Main Results:

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Determination of Aggregate Surface Morphology at the Interfacial Transition Zone (ITZ)

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Last Updated: Jul 13, 2026

Detecting the Water-soluble Chloride Distribution of Cement Paste in a High-precision Way

Detecting the Water-soluble Chloride Distribution of Cement Paste in a High-precision Way

Published on: November 21, 2017

Expression of Cementitious Pore Solution and the Analysis of Its Chemical Composition and Resistivity Using X-ray Fluorescence

Expression of Cementitious Pore Solution and the Analysis of Its Chemical Composition and Resistivity Using X-ray Fluorescence

Published on: September 23, 2018

Determination of Aggregate Surface Morphology at the Interfacial Transition Zone (ITZ)

Determination of Aggregate Surface Morphology at the Interfacial Transition Zone (ITZ)

Published on: December 16, 2019

The model predicts charge reversal on C-S-H particles at high surface charge densities due to Ca2+ ion overcompensation.
Ionic correlations between neighboring particles induce an attractive force (approx. 3 nm range, 1 nN magnitude).
Model predictions align well with experimental AFM data and show stability across parameter variations.

Conclusions:

The proposed model successfully explains C-S-H particle cohesion through ionic interactions.
The findings provide a mechanistic understanding of cement paste setting and strength development.
The model's adaptability allows for predicting the influence of varying cement compositions and ionic additives.