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Related Concept Videos

Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

141
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...
141
Mortar Properties01:17

Mortar Properties

198
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...
198
Mortar01:29

Mortar

333
Mortar, a mixture of Portland cement, hydrated lime, sand, and water, is a crucial binding material in construction. Its primary function is to join masonry units together, filling gaps and ensuring a uniform distribution of weight across the structure. This helps in preventing potential weaknesses. Mortar also serves as a protective barrier against environmental elements such as water and wind, thereby safeguarding the interior of the structure. It also compensates for surface irregularities...
333
Porosity in Cement Paste01:18

Porosity in Cement Paste

240
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...
240
Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

Waterproofing and Anti-Bacterial Admixtures in Concrete

117
Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
Waterproofing admixtures render concrete hydrophobic,...
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Superplasticizers01:30

Superplasticizers

124
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,...
124

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Suspended Multifunctional Nanocellulose as Additive for Mortars.

Maria Vittoria Diamanti1, Cristina Tedeschi2, Mariagiovanna Taccia2

  • 1Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, 20131 Milan, Italy.

Nanomaterials (Basel, Switzerland)
|April 12, 2022
PubMed
Summary
This summary is machine-generated.

Oxidized nanocellulose (ONC) derived from cotton wool enhances mortar properties. This cellulose additive refines pore structure, boosting mechanical strength and durability while reducing water absorption in cement-based composites.

Keywords:
TEMPOacrylatesmechanical resistancemortaroxidized nanocellulosesuspensionwater absorption

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Nanotechnology

Background:

  • Cellulose derivatives are crucial in composite materials for enhanced mechanical performance.
  • Incorporating nanocellulose into cement-based materials influences rheology, hydration, and mechanical properties.
  • Investigating novel nanocellulose additives for improved mortar characteristics is of significant interest.

Purpose of the Study:

  • To synthesize and evaluate oxidized nanocellulose (ONC) as a functional additive for commercial mortars.
  • To assess the impact of ONC on the mechanical properties and water-mortar interactions of hardened mortar.
  • To understand how ONC modifies the microstructure, particularly porosity, of cement-based materials.

Main Methods:

  • Commercial cotton wool was oxidized to produce oxidized nanocellulose (ONC).
  • ONC was suspended and added to a commercial mortar mixture.
  • Mechanical properties (compressive resistance) and water-mortar interactions (water absorption) were evaluated.
  • Microstructural analysis focused on changes in porosity and pore size distribution.

Main Results:

  • The addition of ONC altered mortar porosity, decreasing the overall percentage and shifting pore size distribution towards smaller pores.
  • A significant increase in compressive resistance was observed in mortars containing ONC.
  • The water absorption coefficient of the mortar decreased, and the percentage of micropores increased, suggesting improved durability.

Conclusions:

  • Oxidized nanocellulose (ONC) is a suitable additive for enhancing the mechanical performance and durability of commercial mortars.
  • ONC modifies the mortar microstructure by reducing porosity and refining pore size, leading to improved properties.
  • The findings indicate a potential for ONC to enhance the durability of cement-based materials.