#73 Crushed Limestone (3/4" minus)

#73 Crushed Limestone (3/4" Minus): Base Material for Leveling and Compaction

#73 Crushed Limestone, also known as 3/4" crushed stone with fines, is a widely used base material for construction and landscaping projects. This aggregate is composed of crushed limestone rock with particle sizes up to 3/4 inch (19 mm) and includes a significant proportion of fines-dust and small rock fragments. The combination of coarse and fine particles allows #73 Crushed Limestone to compact tightly, creating a firm, level foundation for paved surfaces and structures.

This material is recognized under several names, including #73 limestone, 3/4" minus limestone, INDOT #73 (meeting Indiana Department of Transportation specifications), Dense Grade Aggregate (DGA), and CA-6 in some Midwest states. Its angular, irregular-shaped particles interlock when compacted, resulting in a stable base with moderate drainage capabilities. The color is typically gray to off-white.

Material Composition and Physical Characteristics

#73 Crushed Limestone is produced by mechanically crushing limestone rock. The gradation includes:

• Maximum particle size: 3/4 inch (19 mm)
• Contains a mix of coarse and fine particles ("minus" indicates inclusion of fines)
• Fines pass through a #200 sieve (clay/silt-sized particles)
• Meets DOT gradation: 100% passing 1" sieve, 90-100% passing 3/4" sieve, 40-70% passing #4 sieve, 0-10% passing #200 sieve
• Free of organic material and debris

The presence of fines is essential for compaction. When installed and compacted correctly, #73 limestone forms a dense, stable surface that resists shifting and settling under load. The typical weight is between 1.3 to 1.5 tons per cubic yard, depending on moisture and quarry source.

Common Applications

#73 Crushed Limestone is primarily used as a base material in the following applications:

• Base for roads, driveways, and parking lots
• Subbase for concrete and asphalt pavements
• Leveling base for patios, walkways, and sidewalks
• Underlayment for pavers, flagstones, and stepping stones
• Backfill for retaining walls
• Temporary construction entrances
• Pipe bedding (where fines are acceptable)
• General construction fill requiring compaction

Installation Guidelines

Proper installation is crucial for performance. Begin by removing topsoil and organic matter to expose a stable subgrade. Place #73 limestone in layers no thicker than 4 to 6 inches. Each layer should be compacted with a plate compactor or roller. Moistening the material during compaction can improve density, but avoid over-wetting, which may cause instability.

For paved areas, a geotextile fabric below the base can prevent soil contamination and extend the life of the installation. #73 limestone is not suitable for areas requiring soft surfaces, decorative stone, or where only clean, washed stone is specified. It should not be used in drainage-critical systems where fines could cause clogging, such as French drains or some septic systems.

Comparisons with Other Base Materials

Limitations and Incorrect Applications

#73 Crushed Limestone is not recommended for the following uses:

• Drainage systems where fines may cause clogging (French drains, septic fields)
• Decorative landscaping where dust and fines are undesirable
• Concrete mixes (gradation not suitable)
• Playgrounds or soft surface areas
• Applications requiring only clean, washed stone

Always verify local requirements and specifications before installation. Limestone's alkalinity may not be suitable for all chemical environments.

Pricing and Delivery Examples

#73 Crushed Limestone is available for delivery across the United States. Prices vary by location, reflecting local sourcing, delivery distance, and logistics. Gravelshop provides instant pricing with delivery included for your ZIP code. Below are sample prices from various regions:

For a complete and current price, enter your ZIP code on the Gravelshop website. All prices include delivery, and taxes and environmental fees are reflected in the total cost.

Key Features of #73 Crushed Limestone

• Angular, crushed limestone up to 3/4 inch with fines
• Excellent for compaction and leveling paver bases
• Gray to off-white color, free of organic debris
• Weight: approximately 1.3-1.5 tons per cubic yard
• Meets DOT and regional gradation requirements

Ordering and Delivery with Gravelshop

Gravelshop delivers #73 Crushed Limestone in bulk, with online ordering available 24/7. Enter your ZIP code to see local pricing and availability. Delivery is performed by experienced haulers, and you can specify your preferred drop location. Please ensure the delivery site is accessible for trucks; otherwise, material will be placed as close as possible. We do not offer spreading or landscaping services-delivery only.

Gravelshop's pricing includes delivery and all fees, so there are no hidden costs. Orders can be placed and paid for online using major credit cards and digital payment options. For questions about your order or delivery, contact our customer support team for assistance.

Summary Table: Technical Specifications

Important Usage Notes

Use #73 Crushed Limestone only for applications where a compacted, stable base is required. Do not use where clean, washed stone or high drainage is specified. Not suitable as a surface layer for decorative or soft-use areas. For further guidance, consult your project specifications or local regulations.