Sand-Gravel Concrete Mix  — Dry Concrete Aggregate Blend
 
Sand-Gravel Mix, commonly known as Con-Mix or Concrete Mix, is a pre-blended combination of clean sand and graded gravel designed for strength, consistency, and ease of use. Available in 3/8" blend and 1" blend, this material is engineered to deliver reliable results for concrete pours, footings, slabs, and general construction projects. By combining the correct proportions of sand and aggregate in one mix, Sand-Gravel Mix eliminates on-site guesswork and ensures uniform performance when cement and water are added. The result is a workable, strong concrete base suitable for both residential and light commercial applications.
 
Available Blends & How to Choose the Right Sand-Gravel Concrete Mix
Sand-Gravel Mix (Concrete Mix / Con-Mix) is available in two standard blends—3/8" and 1"—each designed for different types of concrete work. Choosing the correct blend helps ensure proper strength, finish, and workability for your project.
 
3/8" Sand-Gravel Mix
Finer aggregate with smaller stones
Easier to work, spread, and finish
Produces a smoother concrete surface
Best for:
Sidewalks and walkways
Small slabs and pads
Patios and flatwork
Repairs and hand-finished concrete
Filling CMU blocks aka grout-mix
This blend is preferred when appearance and ease of finishing matter.
 
1" Sand-Gravel Mix
Larger aggregate for increased structural strength
Better load-bearing performance
Slightly rougher finish
Best for:
Footings and foundations
Fence post holes
Thicker slabs and equipment pads
Structural concrete where strength is critical
This blend is commonly used where concrete thickness and durability are more important than surface smoothness.
 
Material Specs, Mixing Ratios & Performance
Sand-Gravel Concrete Mix is designed to deliver consistent strength and workability when combined with Portland cement and water. Because the sand and aggregate are already proportioned, this mix helps reduce variability and improves finished concrete quality.
 
Material Specifications
Blend Types:
3/8" blend (fine aggregate)
1" blend (coarser aggregate)
Composition: Clean concrete sand blended with graded gravel
Texture: Sandy base with evenly distributed stone
Color: Natural gray / tan (varies slightly by source)
Packaging: Sold by the cubic yard, delivered loose in bulk
 
Typical Mixing Ratios (General Guidance)
Final strength depends on cement type, water content, and placement conditions.
Standard concrete mix:
~1 part Portland cement
~3–4 parts Sand-Gravel Mix
Add water gradually to achieve workable consistency
Post holes & footings:
Slightly drier mix for better holding strength
Always follow engineer or project specifications where required.
 
Performance Characteristics
Strength: Produces durable concrete suitable for slabs, footings, and structural pads
Workability:
3/8" blend = easier finishing
1" blend = higher load-bearing capacity
Consistency: Pre-blended aggregate improves uniformity
Durability: Weather-resistant when properly cured
 
Installation & Curing Notes
Compact subgrade before pouring
Avoid excess water (weakens concrete)
Keep concrete damp during early curing for best strength
Protect from freezing or extreme heat during initial set
Sand-Gravel Mix is a dependable choice for projects that demand predictable concrete performance without the hassle of separate materials.
 
Coverage, Ordering & Bulk Delivery of Sand-Gravel Concrete Mix
Sand-Gravel Mix is sold by the cubic yard and delivered loose in bulk, making it an efficient option for concrete projects of all sizes—from small residential pours to contractor-grade jobs. North Bay Materials specializes in local, driveway-friendly dump truck delivery, so you get material where you need it without hauling or multiple yard trips.
 
Coverage Guidelines (Per Cubic Yard)
Actual coverage depends on slab thickness and form dimensions, but typical estimates include:
At 4 inches thick: ~75–80 sq ft
At 6 inches thick: ~50–55 sq ft
At 8 inches thick: ~35–40 sq ft
For footings, post holes, and structural pads, quantities should be calculated by length × width × depth (or diameter × depth for round holes).
 
If you’re unsure how much Sand-Gravel Mix you need, our team can help estimate quantities based on your project specs.
 
Bulk Dump Truck Delivery
Our small, residential-friendly dump trucks are ideal for tight streets, narrow driveways, and urban job sites—perfect for concrete mix delivery where full-size transfers aren’t practical.
5–7 cubic yards per load (depending on access and material weight)
We’ll place the material in a safe, accessible dump location on your property. Please mark preferred drop areas and ensure clear access on delivery day.
 
Fast, Local Service You Can Rely On
North Bay Materials delivers Sand-Gravel Concrete Mix across Marin, Sonoma, Alameda, Contra Costa, San Francisco, and San Mateo counties, serving homeowners, contractors, landscapers, and builders who need reliable material and on-time delivery.
 
Frequently Asked Questions — Sand-Gravel Concrete Mix
1. Is Sand-Gravel Mix the same as concrete?
Not by itself. Sand-Gravel Mix is the aggregate portion of concrete. You still need to add Portland cement and water to create finished concrete.
 
2. Which blend should I use: 3/8" or 1"?
3/8" blend is best for sidewalks, patios, and slabs where a smooth finish matters.
1" blend is best for footings, post holes, and structural concrete where strength is more important than finish.