A subscription to JoVE is required to view this content.
13.3 : Design Example: Aggregate Gradation
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 sampled for gradation from a flowing aggregate stream, conveyor belts, or stockpiles. A single sample typically represents about 45 to 50 tons of sand. Finally, the test portions for sieve analysis are obtained from the field sample using a sample splitter.
Concrete using very fine sands can be uneconomical, and coarse sands can result in less workable mixes. Generally, well-graded sand, without a large deficiency or excess of any size and giving a smooth grading curve within the region bound by the grading curve for fine and coarse sand, is preferred in concrete.
From Chapter 13:
Now Playing
13.3 : Design Example: Aggregate Gradation
Design Examples
81 Views
13.1 : Design Example: Dimensioning of Concrete Masonry Construction
Design Examples
78 Views
13.2 : Design Example: Joints in Concrete Pavements
Design Examples
149 Views
13.4 : Design Example: Managing Concrete Workability
Design Examples
63 Views
13.5 : Design Example: Distributing Reinforcements in Concrete Sections
Design Examples
69 Views
13.6 : Design Example: Sustainability in Concrete Building
Design Examples
142 Views
Copyright © 2025 MyJoVE Corporation. All rights reserved
We use cookies to enhance your experience on our website.
By continuing to use our website or clicking “Continue”, you are agreeing to accept our cookies.