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Related Concept Videos

Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

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This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
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Design Example: Distributing Reinforcements in Concrete Sections01:22

Design Example: Distributing Reinforcements in Concrete Sections

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The topic explores the practical aspects of adjusting steel reinforcements within a concrete beam section to meet specific design requirements. When designing a reinforced concrete beam, it is essential to distribute the steel reinforcements properly to ensure structural integrity and efficiency. The example provided details a scenario where a beam requires a total steel cross-section of 4 square inches. The engineer identifies that the available steel bars have a nominal diameter of 1.693...
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Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

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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...
135
Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

151
The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
The grading, or particle-size distribution, of sand is determined using sieve analysis, with standard sizes ranging from 150 μm to 10 mm (ASTM No. 100 sieve to 3⁄8 in. sieve). Sand is...
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Effects of Air-entrainment in Concrete01:28

Effects of Air-entrainment in Concrete

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Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
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Superplasticizers01:30

Superplasticizers

122
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,...
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Related Experiment Video

Updated: Sep 17, 2025

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Optimizing nanomaterial dosages in concrete for structural applications using experimental design techniques.

Ratchagaraja Dhairiyasamy1, Deepika Gabiriel2,3, Deekshant Varshney4,5

  • 1Saveetha School of Engineering, Department of Electronics and Communication Engineering, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, Tamil Nadu, India.

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|July 2, 2025
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Summary

Nano-silica (NS), nano-alumina (NA), and graphene oxide (GO) enhance concrete strength and durability. Graphene oxide (GO) showed the most significant flexural strength improvement, while NS and GO boosted compressive strength effectively.

Keywords:
ConcreteDurabilityGraphene oxideMechanical propertiesMicrostructureNano-aluminaNano-silica

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Nanotechnology

Background:

  • Nanomaterials offer potential for enhanced concrete performance.
  • Limited comparative studies exist for nano-silica (NS), nano-alumina (NA), and graphene oxide (GO) under uniform conditions.

Purpose of the Study:

  • To experimentally compare the effects of NS, NA, and GO on concrete properties.
  • To optimize nanomaterial dosages for improved strength and durability using Response Surface Methodology (RSM).

Main Methods:

  • Investigated NS (1-3%), NA (1-3%), and GO (0.05-0.15%) effects on concrete workability, strength, and durability.
  • Employed two-factor RSM to model and predict mechanical strengths based on nanomaterial and superplasticizer dosages.

Main Results:

  • NS and GO increased compressive strength by ~25%; GO achieved ~40% flexural strength improvement at 0.10%.
  • All nano-modified concretes showed enhanced durability (RCPT, water absorption, sulfate resistance), with NS and GO outperforming NA.
  • RSM identified nanomaterial dosage as the primary strength determinant; superplasticizer had no significant effect.

Conclusions:

  • Tailored nanomodification strategies using NS, NA, and GO can significantly improve concrete performance.
  • Optimal dosages were determined for each nanomaterial to maximize benefits and prevent overdosing.
  • This study provides valuable data for designing high-performance, durable cementitious materials.