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Related Concept Videos

Strength and Heat of Hydration01:29

Strength and Heat of Hydration

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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...
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Hydration of Cement01:24

Hydration of Cement

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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...
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Strength of Cement01:20

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.
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...
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Types of Cement I01:21

Types of Cement I

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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...
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Mortar Properties01:17

Mortar Properties

204
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...
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Porosity in Cement Paste01:18

Porosity in Cement Paste

250
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...
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Effect of Use of Alkaline Waste Materials as a CO<sub>2</sub> Sink on the Physical and Mechanical Performance of Eco-Blended Cement Mortars-Comparative Study.

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Hybrid Cements: Mechanical Properties, Microstructure and Radiological Behavior.

Ana María Moreno de Los Reyes1, José Antonio Suárez-Navarro2, María Del Mar Alonso1

  • 1Department of Materials, Eduardo Torroja Institute for Construction Sciences (IETcc-CSIC), 28033 Madrid, Spain.

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Summary

This study validates a new method for measuring radioactivity in eco-efficient cements. The method confirmed that cement composition variables do not affect radioactive content in solid samples.

Keywords:
NORMsalkaline activationcharacterizationfly ashgamma spectrometry and radonhybrid cements

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Area of Science:

  • Construction Materials Science
  • Environmental Science
  • Nuclear Chemistry

Background:

  • Sustainable construction relies on eco-efficient cements, often incorporating industrial by-products.
  • These by-products can contain naturally occurring radioactive materials (NORMs), posing potential radiological risks.
  • Accurate assessment of radionuclide activity is crucial for evaluating the safety of these sustainable materials.

Purpose of the Study:

  • To introduce and validate a novel gamma spectrometric method for radionuclide activity measurement in solid cement specimens.
  • To investigate the influence of alkaline activation variables (activator type, reaction time, curing conditions) on the microstructure and radiological behavior of hybrid cements.
  • To compare radioactivity measurements from solid specimens versus powder samples.

Main Methods:

  • Development and application of a gamma spectrometric technique for analyzing 5 cm cubic solid specimens of hybrid alkali-activated cements.
  • Microstructural analysis of cement pastes to correlate with observed radiological properties.
  • Comparative analysis of radionuclide activity in solid samples versus powder samples.

Main Results:

  • The new gamma spectrometric method for solid specimens was validated as reliable.
  • Microstructural analysis revealed similar reaction products (C-S-H, C-A-S-H, (N,C)-A-S-H) across different activation conditions, but with varying microstructures.
  • Crucially, variables in hybrid cement activation did not impact the radioactive content of solid specimens.
  • Powder samples exhibited radon-222 (radon-222) emanation, potentially linked to fly ash structural changes during activation.

Conclusions:

  • The developed gamma spectrometry method is effective for assessing radioactivity in solid eco-efficient cement specimens.
  • Activation process variables do not alter the inherent radionuclide content of the solid cement matrix.
  • Further investigation is needed to understand the radon-222 (radon-222) emanation observed in powder samples and its implications.