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Related Concept Videos

Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

93
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...
93
Plasticizers01:31

Plasticizers

75
Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
75
Porosity in Cement Paste01:18

Porosity in Cement Paste

126
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...
126
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
Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

128
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
128

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Performance of Earth Plasters with Graphene-Based Additive.

Paola Gallo Stampino1, Letizia Ceccarelli1, Marco Caruso2

  • 1Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, Italy.

Materials (Basel, Switzerland)
|May 25, 2024
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Summary

Graphene additives enhance the strength and water resistance of sustainable earth plasters. This study shows improved adhesion in raw-earth construction materials using graphene without traditional stabilizers.

Keywords:
adhesion strengthgraphene-based additiveraw-earth plasters

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Sustainable Architecture

Background:

  • Sustainable earthen architecture faces challenges in mechanical and water resistance without stabilizers.
  • Graphene-based additives show promise for enhancing concrete properties.

Purpose of the Study:

  • To evaluate the impact of a graphene-based additive on the strength and water resistance of raw-earth plasters.
  • To investigate the interaction between soil properties and the graphene additive.

Main Methods:

  • Tested three different soils with varying graphene contents (0.01, 0.05, 0.1 wt%).
  • Conducted geotechnical and mineralogical characterization (XRD, ATR-FTIR).
  • Performed adhesion tests on hollow bricks, capillary rise tests, and erosion resistance tests.

Main Results:

  • Graphene additive increased the cohesion of the earth-sand mixture.
  • Improved adhesion properties of earth plasters were observed.
  • The study linked soil intrinsic properties to additive interaction.

Conclusions:

  • Graphene-based additives can significantly improve the performance of earth plasters.
  • Enhanced cohesion leads to better adhesion, crucial for sustainable construction.
  • This research offers a novel approach to stabilizer-free earthen architecture.