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Related Concept Videos

Setting Time of Cement01:12

Setting Time of Cement

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 Cement01:20

Strength of Cement

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.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in ASTM C...
Types of Cement II01:22

Types of Cement II

Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate resistance.
Porosity in Cement Paste01:18

Porosity in Cement Paste

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.
The balance of water to cement in the mix is critical—it...
Pore Size Distribution01:23

Pore Size Distribution

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...
Water Cement Ratio01:28

Water Cement Ratio

The water-cement ratio is pivotal in defining concrete's quality. This ratio, a balance between the weight of water and cement in the mix, shapes the concrete's strength, durability, and resistance to environmental factors. As identified by Abrams’ law, less water in the mix equates to stronger concrete. However, water is essential not only for the chemical process of hydration but also for the concrete's workability and compaction. While hydration chemically binds water and cement, physical...

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Related Experiment Video

Updated: Jul 10, 2026

Detecting the Water-soluble Chloride Distribution of Cement Paste in a High-precision Way
07:42

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

Published on: November 21, 2017

Controlling the cohesion of cement paste.

Bo Jönsson1, A Nonat, C Labbez

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

Langmuir : the ACS Journal of Surfaces and Colloids
|September 21, 2005
PubMed
Summary

Cement cohesion relies on calcium silicate hydrate (C-S-H) nanoparticles. Ion correlations, particularly calcium ions, ensure concrete

Area of Science:

  • Materials Science and Engineering
  • Physical Chemistry
  • Computational Chemistry

Background:

  • Cement paste cohesion originates from calcium silicate hydrate (C-S-H) nanoparticles formed from tricalcium silicate (C3S) dissolution.
  • Traditional double-layer theory is inadequate for describing interactions between charged C-S-H particles due to strong ion-ion correlations and weak entropic repulsion.

Purpose of the Study:

  • Investigate the influence of ionic additives and pH on concrete stability using Monte Carlo simulations.
  • Explore the physical affinity of calcium ions to C-S-H particles and its impact on cement cohesion.

Main Methods:

  • Utilized Monte Carlo (MC) simulations within the primitive model of electrolyte solutions to include ion-ion correlations.
  • Employed grand canonical ensemble simulations to study the effects of various ionic additives and pH levels.

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

Published on: September 23, 2018

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

Published on: September 23, 2018

  • Developed a simple analytical model to semiquantitatively reproduce simulation findings.

    • Main Results:

    • Confirmed a strong physical affinity between calcium ions and negatively charged C-S-H/C3S particles, crucial for concrete robustness.
    • Demonstrated that cement cohesion remains stable despite diverse additives if calcium concentration and C-S-H surface charge are sufficiently high.
    • MC simulations predicted charge reversal on C-S-H and C3S particles due to divalent counterion affinity, consistent with experimental measurements.

    Conclusions:

    • The strong affinity of calcium ions to C-S-H particles is key to concrete's robust properties.
    • Cement cohesion is resilient to a wide range of additives under conditions of high calcium concentration and C-S-H surface charge.
    • Observed charge reversal phenomenon highlights the complex interplay of ions and charged surfaces in cementitious systems.