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Related Concept Videos

Porosity in Cement Paste01:18

Porosity in Cement Paste

295
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...
295
Hydration of Cement01:24

Hydration of Cement

485
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...
485
Portland Cement01:21

Portland Cement

362
Portland cement is the essential binding ingredient in concrete, made from finely ground materials including lime, iron, silica, and alumina. Lime is derived primarily from limestone, marble, marl, seashells, and clays, which also supply iron and alumina, while silica is sourced from sand, chalk, and bauxite. Contemporary manufacturing of Portland cement is a significant source of carbon dioxide emissions, prompting research into reducing its content in concrete through alternative...
362
Types of Cement II01:22

Types of Cement II

223
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...
223
Types of Cement I01:21

Types of Cement I

220
Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
220
Soundness of Cement01:17

Soundness of Cement

310
The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
310

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Related Experiment Video

Updated: Nov 5, 2025

Expression of Cementitious Pore Solution and the Analysis of Its Chemical Composition and Resistivity Using X-ray Fluorescence
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Cement Interfaces: Current Understanding, Challenges, and Opportunities.

Ozge Heinz1, Hendrik Heinz1

  • 1Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 17, 2021
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Summary
This summary is machine-generated.

Greener cement chemistry is crucial for sustainability. New insights into colloid and interface science can address unresolved questions in hydration reactions and reduce CO2 emissions from concrete production.

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Area of Science:

  • Materials Science
  • Chemistry
  • Colloid and Interface Science

Background:

  • Growing demand for cement and concrete presents sustainability challenges, including an 11% global CO2 emission footprint.
  • Cement chemistry, particularly at particle interfaces and during hydration, involves complex interactions with electrolytes and additives.
  • Developing sustainable cement formulations is essential to mitigate environmental impact.

Purpose of the Study:

  • To highlight current research challenges and opportunities in cement and concrete chemistry.
  • To explore colloid and interface science problems relevant to cement hydration and formulation.
  • To emphasize the need for integrated chemical knowledge for improved cement properties.

Main Methods:

  • Reviewing cement phase characteristics, supplementary cementitious materials, and constituents.
  • Discussing hydration reactions and characterization techniques like imaging and NMR spectroscopy.
  • Examining the structure of hydrated cement phases, including calcium-silicate-hydrates.
  • Exploring quantitative simulation techniques from atomic to microscale.
  • Analyzing the role and function of organic additives in cementitious systems.

Main Results:

  • Identified key areas in cement chemistry requiring further investigation, such as interfacial phenomena and hydration mechanisms.
  • Highlighted the importance of understanding calcium-silicate-hydrate (C-S-H) structure across multiple scales.
  • Emphasized the potential of computational modeling for predicting cement behavior.
  • Underscored the influence of electrolytes and organic additives on cementitious material performance.

Conclusions:

  • Integrating knowledge from diverse chemical disciplines (inorganic, acid-base, polymer chemistry) is vital for advancing cement science.
  • New chemistry insights can lead to greener, more sustainable cement and concrete formulations.
  • Addressing unresolved questions in cement chemistry will enable the development of materials with improved performance and reduced environmental impact.