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Related Concept Videos

Types of Cement II01:22

Types of Cement II

85
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...
85
Hydration of Cement01:24

Hydration of Cement

171
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...
171
Types of Cement I01:21

Types of Cement I

89
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...
89
Preplaced Aggregate Concrete01:29

Preplaced Aggregate Concrete

88
Preplaced aggregate concrete is ideal for construction environments that are not easily accessible. The process begins by properly wetting the gap-graded coarse aggregates to remove the dirt, then placing it in the form and compacting it. Voids are filled with a mortar mix pumped under pressure through slotted pipes. This mortar typically consists of Portland cement, pozzolan, fine aggregates, water, and a fluidizing aid. The pozzolan helps reduce bleeding and segregation while improving the...
88
Superplasticizers01:30

Superplasticizers

72
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
72
Transition Zone01:28

Transition Zone

64
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...
64

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Updated: May 14, 2025

Production and Analysis of Sporosarcina pasteurii Biocement Bricks Using Custom 3D-Printed Molds for Unconfined Compression Tests
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Production and Analysis of Sporosarcina pasteurii Biocement Bricks Using Custom 3D-Printed Molds for Unconfined Compression Tests

Published on: March 7, 2025

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Surface-Engineered Cenospheres Encapsulating Phase Change Materials for Functional Cementitious Composites.

Sahand Rahemipoor1, Carsten Kuenzel2, Toms Valdemārs Eiduks3

  • 1Department of Civil and Mechanical Engineering, Technical University of Denmark, Kgs Lyngby, 2800, Denmark.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 11, 2025
PubMed
Summary
This summary is machine-generated.

This study developed novel microencapsulated phase change materials (PCMs) using silica-sealed cenospheres. This approach significantly enhances mechanical strength for energy-efficient buildings without compromising thermal energy storage.

Keywords:
cenospheresetchinginterfacemolecular dynamicsphase change materials

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sustainable Building Technologies

Background:

  • Growing global energy demand necessitates energy-efficient building solutions.
  • Microencapsulated phase change materials (PCMs) offer passive thermal energy storage but face integration issues in cementitious materials.
  • Weak shell strength and poor interfacial bonding hinder PCM integration, reducing mechanical properties.

Purpose of the Study:

  • To develop functionalized microencapsulated PCMs from fly ash-based cenospheres for improved interfacial compatibility.
  • To investigate silica as a novel sealing material for microencapsulated PCMs, comparing it to standard melamine-formaldehyde (MF).
  • To enhance the mechanical strength and thermal energy storage capabilities of building materials.

Main Methods:

  • Synthesizing microencapsulated PCMs using fly ash-based cenospheres, perforated and sealed with either MF or silica.
  • Evaluating mechanical properties through experimental testing.
  • Utilizing molecular dynamic simulations to analyze interfacial binding energy and tensile strength.
  • Conducting thermal analyses to confirm PCM preservation.

Main Results:

  • Silica sealing improved the mechanical strength of microencapsulated PCMs by 50% compared to MF.
  • Molecular dynamic simulations revealed silica's binding energy with calcium silicate hydrate was over threefold higher than MF.
  • Silica-sealed PCMs exhibited more than double the uniaxial tensile strength.
  • Thermal analyses confirmed the phase change material (PCM) integrity was maintained with both sealing methods.

Conclusions:

  • Functionalized microencapsulated PCMs sealed with silica offer superior mechanical properties for cementitious composites.
  • This novel approach overcomes previous limitations, enabling effective integration of PCMs for enhanced thermal energy storage in buildings.
  • The study presents a transformative pathway for developing advanced, energy-efficient building materials.