#57 Trap Rock (1/2 - 1")

#57 Trap Rock (1/2 - 1") Crushed Stone: Technical Overview

#57 Trap Rock, also known as #57 Crushed Trap Rock, #57 Aggregate, Trap Rock #57, or Crushed Stone #57 (Trap Rock), is an angular, crushed igneous rock. The typical particle size ranges from 1/2 inch to 1 inch (12.5 mm to 25 mm). This material is dark in color, commonly basalt or diabase, and is known for its high durability, strength, and resistance to weathering and abrasion. The rough texture and angular shape of each stone allow for strong interlock between particles, which is essential for stability in construction and landscaping applications.

#57 Trap Rock meets ASTM C33 and AASHTO M43 gradation standards for #57 aggregate. It is clean, free of clay, silt, and organic impurities, and has a specific gravity between 2.8 and 3.0. The absorption rate is typically below 2%, ensuring the aggregate remains stable and consistent under varying conditions. The Los Angeles Abrasion value is usually below 30%, confirming its resistance to fragmentation and long-term wear.

Key Characteristics and Practical Benefits

• Particle size: 1/2 inch to 1 inch, ensuring consistent gradation and compaction.
• Angular, rough texture for strong interlock and load distribution.
• High density and low absorption for stability in wet and dry environments.
• Excellent drainage properties due to interconnected voids between particles.
• Resistant to freeze-thaw cycles and heavy traffic loads.

The angular shape of #57 Trap Rock is especially useful for top layers of driveways and walkways, where interlock and drainage are critical. The material is also used as a base layer in some applications, supporting overlying surfaces by distributing loads and allowing water to drain away efficiently. This helps prevent pooling and reduces the risk of surface erosion.

Applications and Suitable Uses

#57 Trap Rock is used across residential, commercial, and infrastructure projects. Its most common uses include:

• Top Layer for Driveways and Walkways: Provides a stable, erosion-resistant surface that supports both vehicle and foot traffic.
• Base Layer Material: Sometimes used beneath driveways, pads, and other hardscapes to enhance drainage and load-bearing capacity.
• Drainage Installations: Effective in French drains, utility bedding, and pipe bedding due to its permeability.
• Concrete and Asphalt Aggregate: Meets specifications for use in mixes requiring coarse aggregate.
• Railroad Ballast and Erosion Control: Utilized for stability and durability in high-stress environments.

Material Specifications

Limitations and Correct Usage

#57 Trap Rock is not suitable as a surface finish for areas where smoothness is required, such as finished patios or interior flooring. It should not be used in applications where a fine, compacted surface is necessary, as the angular particles will not create a smooth finish. For best results, ensure the subbase is properly prepared, and avoid using #57 Trap Rock where fine grading is essential.

This material is intended for structural and drainage roles, not for decorative purposes requiring uniform color or texture. It is important to note that size variation of up to 5% and the presence of fines may occur, as is standard in the industry.

Ordering and Delivery Information

At Gravelshop, you can order #57 Trap Rock online in less than a minute. All prices include delivery, sales tax, and any relevant charges. Delivery is available across 31 U.S. states, with material sourced from local pits or quarries to minimize cost and delivery time. The minimum order quantity typically ranges from 2 to 5 tons, depending on your location and material availability. Please ensure access roads are at least 12 feet wide and suitable for heavy trucks. Gravelshop does not spread the material; we deliver only.

You can select your preferred delivery date and time during checkout. If you are not home at the time of delivery, the material will be left unattended at the designated location, and you will be responsible for it. For any questions or special requirements, please refer to our contact page.

Sample Pricing Across the US

The cost of #57 Trap Rock varies by city and delivery location. Pricing includes delivery and is subject to local availability. Below are example prices for selected locations:

Prices can be checked for your specific ZIP code on our website. Delivery rates may change based on distance, order size, and local supply conditions.

Summary Table: Common Applications and Benefits

Ordering Process and Additional Details

To order #57 Trap Rock, add the product to your cart, enter your ZIP code, and select the quantity. All prices shown include delivery, with no hidden fees. Payment can be made online using major credit cards or digital wallets. After checkout, you will receive a confirmation email with delivery details. If you have questions or need assistance, our customer care team is available by phone, email, or SMS.

Gravelshop supplies bulk quantities for any project size, from small DIY jobs to large commercial orders. We do not offer spreading or landscaping services. The material is delivered only, and delivery conditions must be met for successful unloading.

#57 Trap Rock is a reliable aggregate for driveways, walkways, and drainage layers, offering strong interlock and excellent drainage. Check our website for current pricing and availability in your area.