Hard Rock Mix (1 1/2")

Hard Rock Mix (1 1/2"): Structural Aggregate for Heavy-Duty Base and Drainage Applications

Hard Rock Mix (1 1/2"), also known as 1 1/2" Hard Rock Concrete Mix, 1 1/2" Aggregate Concrete Mix, 1 1/2" Minus Concrete Mix, or 1 1/2" All-in Aggregate Mix, is a robust, angular crushed stone aggregate. The mix contains stones up to 1 1/2 inches in size, combined with sand, gravel, or crushed stone, and may include some fines (particles passing a #200 sieve). The angular nature of the aggregate ensures strong interlock and stability, making it suitable for use as a base material in construction projects that require high strength and durability. The material is not suitable for walking surfaces due to its large size and uneven texture.

This aggregate is designed for heavy-duty applications where compaction, load-bearing, and drainage are priorities. Its well-graded blend allows for efficient compaction while maintaining voids for water drainage. It is typically gray in color, and the exact composition can vary by quarry and region. Hard Rock Mix (1 1/2") may be produced to meet ASTM C33 or local DOT standards for use in concrete or structural fill. Bulk density ranges from approximately 2,400 to 2,700 lbs per cubic yard, depending on local source and moisture content.

Key Characteristics and Practical Applications

• Contains crushed rock aggregate up to 1 1/2" in size
• Angular particles interlock for stable, compacted base
• Drains water efficiently when properly graded and washed
• Suitable as a base layer for roads, driveways, parking lots, and building pads
• May be used as backfill for retaining walls and trenches, and as a general construction fill

The interlocking angular stone structure provides a stable foundation that resists shifting and rutting under load, making it ideal for use beneath driveways, RV pads, parking lots, and heavy-duty surfaces. When used in subsurface drainage systems, such as French drains, the large stone size allows water to pass through easily, helping to prevent water buildup and erosion.

Limitations and Incorrect Applications

• Not suitable for finished concrete surfaces requiring smoothness
• Not appropriate for thin overlays or as a top dressing
• Not recommended for applications where a fine, compacted surface is needed (such as under pavers or as decorative gravel)
• May not be suitable for drainage if fines content is high
• Not intended for precise grading or specialty concrete mixes

Because of the large aggregate size, this material is too coarse and uneven to be walked on comfortably. It should not be used where a smooth or fine finish is required. If used in drainage applications, ensure that the fines content is low and the material is washed if necessary to maintain permeability.

Technical Specifications

Typical Use Cases

Regional Price Examples for Hard Rock Mix (1 1/2")

Pricing for Hard Rock Mix (1 1/2") varies by location, reflecting local sourcing and delivery logistics. Delivery is included in the price shown for each region. The following table shows sample prices from different cities across the United States.

These prices are examples and may change based on order size, supplier, and location. Delivery is included in the total price. For a specific quote, enter your ZIP code on the Gravelshop website to see local pricing and availability.

Ordering and Delivery Information from Gravelshop

Gravelshop supplies Hard Rock Mix (1 1/2") in bulk quantities suitable for residential, commercial, and municipal projects. All prices on the website include delivery and taxes. Orders can be placed online by selecting your product, entering your ZIP code, and choosing your preferred delivery slot. Delivery is performed by independent trucking companies, and the driver will unload the material at the most suitable accessible location at your site. Gravelshop does not spread the material or perform landscaping work. For orders not listed on the website or for larger quantities, contact Gravelshop directly for assistance.

Summary of Key Points

• Hard Rock Mix (1 1/2") is too large and uneven for walking surfaces
• Functions as a structural base material with interlocking, angular stones
• Supports drainage when properly graded and washed
• Should not be used where a fine, smooth, or decorative finish is needed
• Check local standards for compliance with specific construction requirements

For further details, technical questions, or to place an order, visit the Gravelshop website or contact customer support. All transactions and deliveries are governed by US law and local regulations. Material is supplied as described, with typical size and fines variation up to 5%.