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Related Concept Videos

Mortar Properties01:17

Mortar Properties

Mortar properties encompass a range of characteristics crucial for construction and masonry work, including workability, water retention, bond strength, durability, compressive strength, volume change, and appearance. Workability refers to mortar's ability to be easily applied and manipulated without sagging or falling off surfaces, which is important for efficient masonry unit placement and alignment. Water retention is essential to prevent the mortar from losing moisture too quickly to the...
Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Strength and Heat of Hydration01:29

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.
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Hydration of Cement01:24

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Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
Transition Zone01:28

Transition Zone

The transition zone in concrete is a critical area where aggregate meets cement paste, marked by a distinct porosity and weakness compared to the surrounding material. The adhesion around the aggregates is primarily due to Van Der Waals forces. The voids within this zone influence its robustness; initially, it is less durable than the surrounding bulk mortar due to larger voids. Initially, when concrete is compacted, a higher water-cement ratio near the aggregates leads to the formation of...
Mortar01:29

Mortar

Mortar, a mixture of Portland cement, hydrated lime, sand, and water, is a crucial binding material in construction. Its primary function is to join masonry units together, filling gaps and ensuring a uniform distribution of weight across the structure. This helps in preventing potential weaknesses. Mortar also serves as a protective barrier against environmental elements such as water and wind, thereby safeguarding the interior of the structure. It also compensates for surface irregularities...

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Ca/Na montmorillonite: structure, forces and swelling properties.

M Segad1, Bo Jönsson, T Akesson

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

Langmuir : the ACS Journal of Surfaces and Colloids
|March 19, 2010
PubMed
Summary

Monovalent ions cause significant clay swelling, while divalent ions limit it due to ion-ion correlations. These correlations can lead to clay phase separation, explaining observed swelling behaviors.

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Area of Science:

  • Clay Science
  • Materials Science
  • Physical Chemistry

Background:

  • Montmorillonite clay swelling is crucial for applications like waste disposal and material science.
  • Understanding the influence of counterions on clay swelling is essential for predicting its behavior in various environments.

Purpose of the Study:

  • To investigate the swelling behavior of Ca/Na montmorillonite and Wyoming bentonite (MX-80).
  • To elucidate the role of monovalent (Na+) and divalent (Ca2+) counterions in clay swelling.
  • To explore the impact of ion-ion correlations on clay osmotic pressure and phase behavior.

Main Methods:

  • Monte Carlo simulations to model clay-water systems.
  • X-ray scattering experiments to measure lamellar spacing.
  • Dialysis experiments to assess clay swelling in different ionic conditions.

Main Results:

  • Monovalent counterions promote significant clay swelling, while divalent ions result in limited swelling (~10 A aqueous layer).
  • Simulations align with X-ray data for divalent ions; dialysis shows larger swelling for Ca-montmorillonite in pure water, indicating intra- and extra-lamellar swelling.
  • Ion-ion correlations reduce entropic repulsion and introduce attraction, favoring divalent ions and leading to non-monotonic osmotic pressure and potential phase separation.

Conclusions:

  • Ion-ion correlations are key to understanding clay swelling, particularly with divalent counterions.
  • The non-monotonic osmotic pressure suggests phase separation, consistent with experimental observations of different swelling regimes.
  • This study provides a theoretical and experimental framework for predicting clay behavior in complex ionic environments.