A.: Richard Meininger replied that there is no problem designing a concrete mixture with 3/8-inch maximum size coarse aggregate (pea gravel or crushed stone) using the ACI 211 proportioning procedures for a concrete slab placed by pumping. But the concrete will shrink more than a No. 57 mixture, so control joints must be at a closer …

Using our crushed stone calculator, you can find the quantity and weight of the crushed stone or gravel that you'll need to layout or fill an area. The following article …

Why Do You Need Gravel Under a Concrete? Gravel, or crushed stone, provides a stable surface for your concrete slab. Even the most solid, compacted soil can shift dramatically with the weather changes, which will undermine your slab and cause cracks. ... There are many different sizes of gravel that are crushed to sizes that are specific to ...

Crushed stone #411. Crushed stone #411 has similar sizes as stone #57. However, unlike crushed stone number 57, it does have the dust created during the breaking or crushing process, i.e., rock screenings. The presence of stone dust means that it is compactable and becomes stable and solid.

The size of crushed stone for a driveway typically ranges from 0.5 inches to 2.5 inches in size, depending on what type of stone you're using and the size and scope of the driveway project. ... Having proper drainage of water is especially important if the concrete slab is in an area that gets a lot of rain or if there is standing water on ...

Old concrete can be crushed down to specific sizes, cleaned so that unwanted debris is removed from the mixture, and reused as a solution to a number of construction and landscaping problems. US …

7.9 Design the concrete mix according to the following conditions: Design Environment Pavement slab, Bozeman, Montana (cold climate) Required design strength = 3000psi Slab thickness = 12in. Statistical data indicate a standard deviation of compressive strength of 250 psi is expected (more than 30 samples). Only air entrainer is allowed.

Choosing the right type of gravel—be it 3/4" crushed gravel, 1" minus, or another suitable option—is key to the performance and longevity of your concrete patio, …

Crushed Concrete Volume Estimator. Follow this 4-step process to calculate your needs: Step 1: Measure Site Dimensions. Length x Width = Area in ft2 for rectangular shapes. …

Hydraulic cement concrete is a cement and water paste in which aggregate particles are embedded. Aggregate is granular material such as sand, gravel, crushed stone, blast-furnace slag, and lightweight aggregates that usually occupies approxi-mately 60 to 75% of the volume of concrete. Aggregate properties significantly affect the workability of ...

Crushed stone, 1.5-2 inch size: Stability, drainage: Patio: 4-6 inches: Crushed stone, 0.75-1 inch size: Level surface for pavers: Slab foundation: 6-12 inches: Crushed stone, 0.75-1 inch size: Stability, frost prevention: Footing: 12-18 inches: Crushed stone, 2-3 inch size: Heavy load support

7.9 Design the concrete mix according to the following conditions: Design Environment Pavement slab, Bozeman, Montana (cold climate) Required design strength = 3000 psi Slab thickness = 12 in. Statistical data …

Can 3/4 crushed concrete be used under basement concrete slab? The only other option we have is 3/4 bluestone gravel and it's twice the cost. ... concrete-free basement slab gravel size. ... If that's the case, it probably just makes sense to do all stone instead of crushed concrete. It's only 4" of aggregate under the slab, doesn't ...

Different types of crushed stone come in various sizes and will influence the grade of the base soil and how easily the concrete is laid. The right size gravel helps distribute and level off the ground underneath your slab, resulting in a smooth, flat surface that provides consistent support.

The main goal is to produce a concrete mix that can support a slab thickness of 12 ... Coarse aggregate: 2 in. nominal maximum size, crushed stone Bulk oven-dry specific gravity = 2.573, Absorption = 0.1% Oven-dry rodded density = 120 pcf Moisture content = 1% Fine aggregate: Natural sand Bulk oven-dry specific gravity = 2.54, Absorption = …

Types of gravel include crushed stone, crushed gravel, dense-graded aggregate, pea gravel, recycled concrete aggregate, and screened gravel. …

A gravel base with at least 4" of crushed stone can support nearly the same amount of weight as an equally thick concrete pad. (Plus, the concrete pad will require a layer of crushed stone under it anyway.) Placing stabilization fabric beneath the gravel (more on this below) improves the stability of the gravel hot tub pad even further.

Crushed Concrete Driveways; Stone Backfills; Sand. Beach Nourishment; Sand Backfills; ... Different sizes of crushed concrete can function together to help prevent erosion. A layer of smaller, more broken-up crushed concrete as a base will contribute to the stability of the wall. Following with layers of larger recycled concrete packed with ...

Answer: 3/8 inch crushed stone Explanation: For a 4-inch thick concrete slab, the recommended size of aggregate varies depending on several factors including the intended use, local specifications, and the desired finish of the concrete. Here are some general guidelines: 1. Aggregate Size Range: The aggregate used in concrete for a 4-inch slab …

This is 2–4-inch crushed stone in size. Commonly crushed stone #1 is used for stormwater outfall areas, sewer projects, slope protection, haul roads, culvert ballast, and septic projects. Crushed Stone #2. A ¾-inch to 1 1/4-inch stone, crushed stone #2 is often used for driveways, rough site pads, farm roads, and construction entrances.

#1 – The # 1 crushed stone grade is the largest of the crushed stone grades and includes stone between 2-4 inches long. This material is great for larger jobs or for …

Use crushed with fines, otherwise know as whatever size minus. When we pave new roads we use what is called around here to DOT specs, CSBC and CSTC. CSBC is crushed stone base course CSTC is crushed stone top course CSBC is actually 1 3/4" minus CSTC is actually 5/8" minus The CSBC is the base of at least 10-12" deep with a …

I've done them in a mind-boggling variety of ways—from stringers resting on solid concrete blocks over a bed of crushed stone, to treated 4x4s attached to deep (sometimes 5-ft.) piers on wide footings, to other methods too complicated to recount (for a 100-year old porch where price was no obstacle) or too minimal to admit (for a camper ...

Slab Weight (lbs/sq ft) Slab Thickness (in) Soil Type Recommended Crushed Stone Size 0–50 4 Compact 1/4-inch 50–100 6 Compact 3/8-inch 100–150 8 Compact 1/2-inch 150–200 10 Compact 3/4 ...

Concrete blocks. $15–$30. Some slope is OK. No. Concrete piers. $6–$12. Yes. Yes. Concrete slab/ concrete pad/ concrete foundation with footers. $5–$25. Yes. Yes. Deck blocks. $12–$25. Some slope is OK. No. Floating concrete slab on-grade foundation. $4–$8. Yes. Yes, but may require additional work. Gravel pad/gravel …

Crushed stone grade no. 1 is the largest size with diameters ranging from around 2 inches to 4 inches. As this grade contains larger pieces, it's not suitable for …

This article explains the most ideal material for concrete slabs. We also guide you through the process of setting up and why it is necessary to do so. ... that separates the concrete slab from the existing soil (subgrade). In most cases, this construction layer is made of crushed stone material and acts as a support between …

Malcolm, I had assumed 4" was sufficient. If it needs 6", I will comply, but at $675 per 22ton load, it hurts. :) Also, when you say - [top dress the 6" below the slab with a drainable fill] - you are talking about the 3/4" gravel between the ground and the concrete, or in my case between the ground and Fomular 250 25 psi and then concrete.

design mix for concrete slab required following procedure. w/c ratio. target strength. View the full answer. Step 2. Unlock. Step 3. Unlock. Step 4. Unlock. Step 5. ... Coarse aggregate: 2 in. nominal maximum size, crushed stone Bulk oven-dry specific gravity=2.573, Absorption=2.8%, Oven-dry rodded density=120 pcf, Moisture …

With slab-on-grade foundations, an alternative to native soil material may be used to restore grade. These imported fills may include granular materials such as sand, gravel, or crushed stone. These high-strength and permeable materials offer low compressibility, which is ideal for a slab-support system.