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Related Concept Videos

Pozzolans01:21

Pozzolans

104
Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
104
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

92
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
92
Porosity in Cement Paste01:18

Porosity in Cement Paste

118
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...
118
Types of Cement II01:22

Types of Cement II

100
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...
100
Superplasticizers01:30

Superplasticizers

81
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,...
81
Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

71
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
71

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Modified Sepiolite Nanoclays in Advanced Composites for Engineering Applications.

Yue Tang1, Dankun Yang2, Valeska P Ting3

  • 1School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K.

ACS Applied Nano Materials
|August 29, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a simple method for modifying sepiolite clays, improving their dispersion in benzoxazine matrices. These modified clays act as effective nanoenhancers for advanced polymer nanocomposites.

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • Clay-polymer nanocomposites (CPNs) offer improved mechanical and thermal properties.
  • Dispersing nanoclays in polymer matrices is a significant challenge for CPN preparation.

Purpose of the Study:

  • To demonstrate a simple modification process for organophilic sepiolite clays.
  • To utilize a benzoxazine monomer as a clay modifier for enhanced dispersion.
  • To explore the potential of modified sepiolites as nanoenhancers for advanced composites.

Main Methods:

  • Modification of two sepiolite clays using surfactants.
  • Utilizing a benzoxazine monomer as a dispersing agent and matrix precursor.
  • Comparing the dispersion of modified sepiolites versus pristine clay in the benzoxazine matrix.

Main Results:

  • Successfully modified sepiolite clays exhibit improved dispersion in the benzoxazine matrix.
  • The benzoxazine monomer effectively aids in dispersing the modified clays.
  • Pristine sepiolite clay shows poor dispersion compared to the modified versions.

Conclusions:

  • A straightforward modification approach enhances sepiolite clay dispersion in benzoxazine.
  • Modified sepiolites show promise as effective nanoenhancers for advanced polymer nanocomposites.