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Did you know that crushed stone and gravel are not the same? Although both come from the same material and the same local stone quarries, these two stone products are produced differently and have different uses in construction and landscaping projects.
Crushed stone and gravel suppliers keep these two aggregates in separate categories because of their differing production methods, sizes, and uses. When deciding on which type to use for your construction project needs, consider these differences when speaking with yourlocal gravel supplier.
Crushed stone is a product of rocks being broken down using a crushing machine. Crushed stone is sourcedalso known as quarriedfrom a parent rock. The most common parent rocks used for crushed stone are:
Limestone is the most common rock type used to make crushed stone in North America due to its wide availability and versatility. It is also easy to crush because it is soft. And it causes less wear on equipment compared to harder rocks.
Ranging in particle size from largest to smallest, limestone is available as coarse aggregate, crushed limestone, mine run limestone, and limestone fines. Limestone is a key ingredient in concrete and is also used to make cement.
After limestone, granite is the second most popular rock used for crushed stone. It is durable and resistant to acidic water and soil. Crushed granite is also a suitable and durable substitute for limestone in concrete.
Scoria is a vesicular rock, meaning it has voids in it that formed from gas bubbles that were trapped in the rock as it solidified from a melt. These voids make scoria and other vesicular rocks weaker, unable to withstand heavy loads. The voids also make these rocks less durable during freeze-thaw cycles.
But these voids also make scoria more lightweight. And its rough surfaces help it bind well as a concrete aggregate. Scoria is an ideal crushed stone for lightweight aggregates, lightweight concrete, and even roofing granules.
Scoria and other lightweight vesicular rocks, like volcanic cinder, are easy to handle and are also ideal for use in landscaping, garden planters, saunas, grills, filter stone, and traction on snow-covered roads.
Composed mostly of quartz, sandstone is a durable material. However, it does have its drawbacks. Sandstone naturally forms from sand grains that have been cemented together by clay, calcite, or silicate minerals. But since this natural cement doesnt fill all the voids between the sand grains, sandstone is porous.
The porous spaces in sandstone allow this rock to absorb water easily. As a result, water absorbed in sandstone will expand every time it freezes. Over time, the freeze-thaw cycle will take its toll on sandstone, causing the sand grains to dislodge and the rock to break. As such, sandstone is not ideal for use in cold climates that experience extreme freeze-thaw cycles.
When heated, the sand particles in sandstone weld together. This heated sandstone is known as quartzite. Quartzite is extremely durable, even during freeze-thaw cycles. But this hard rock is more difficult to mine, handle, and transport, making it unpopular for construction use.
Gravel is fragmented rock sourced from deposits of weathered rock found in rivers, streams, and gravel pits. Although gravel is a natural product of erosion and weathering, gravel suppliers can mine gravel in quarries using the same crushing equipment for crushed stone.
Due to the crushing process, crushed stone typically has more angular surfaces. Gravel tends to have a rounder shape due to the natural weathering process, and is usually much smaller than crushed stone. However, gravel that is crushed will have a more angular shape.
Crushed stone ranges in size from fine stone dust (screenings) to larger and heavier stones. Gravel comes in various sizes that are larger than 2 mm in diameter, starting from about a inch, and going up to 2 inches or more.
The most common use for crushed stone is as an aggregate for construction projects. The angular surface of crushed stone makes it easy to tamp, roll, and vibrate into place, locking and forming a stable surface.
Oftentimes, both crushed stone and gravel are used together in both small and large construction projects to make the most of their qualities. Crushed stone, sand and gravel are commonly used as key ingredients for mixing concrete. These aggregates are also used as:
Both the base and sub-base layers can be a mixture of large (3/4 inch), medium (3/8 inch), and small (less than 1/8 inch) aggregates. The medium-sized particles fill the void of the large aggregates, and the small particles fill the voids of the medium aggregates, making for a dense and sturdy layer.
If you originally considered these two aggregates to be the same, you are not alone. They are often confused for one another since both gravel and crushed stone come from rocks and are aggregates used for construction projects.
But these two aggregates serve different uses. Ultimately, if you want an aggregate for construction, such as building, paving, and any hardscaping, go with crushed stone. If you are looking for decorative stones for your landscape, garden, walkway, and driveway, go for gravel.
Over the past 30 years in the Ready Mix Concrete business TRP Ready Mix has completed several commercial and residential projects, both large and small. Some of the more notable projects completed include;
Granite is not easy to crush to sand, main equipment has PE-7501060 jaw crusher (coarse crusher), HP300 cone crusher (fine crusher), bin, 490110 vibrating feeder, B1000x22 conveyor belt, B1000x30m conveyor belt, B800x31 conveyor belt, 4YK2460 vibrating screen, etc. contact us!
In this case, we recommend the use of a PCZ1308 heavy hammer crusher with a feed size of 930x650mm, the feed particle size is less than 600mm, the motor power is 4P 132Kw, and the processing capacity of the equipment is 100-180t/h.
Eastman is a typical direct selling enterprise with green and standardized production plants. All the delivery of the equipment will be completed within the delivery period signed by the contract to ensure the smooth commissioning of the equipment.
Rock crushers have a wide range of suitable material to choose from, whether its soft or hard, or even very hard, rock crushers can reduce those large rocks into smaller rocks, gravel, or even rock dust.Here are some typical materials that break or compress by industry crushers, such as Granite, quartz stone, river pebble, limestone, calcite, concrete, dolomite, iron ore, silicon ore, basalt and other mines, rocks and slag.
Understanding the stages of crushing process and the types of crushers that best fit each stage can simplifies your equipment selection. Each type of crusher is different and used to achieve a certain end result.
Similarly, a certain output is expected at the end of each crushing stage for the next phase of the process. Aggregate producers who pair the correct crusher to the correct stage will be the most efficient and, in turn, the most profitable.
A jaw crusher is a compression type of crusher. Material is reduced by squeezing the feed material between a moving piece of steel and a stationary piece. The discharge size is controlled by the setting or the space between those two pieces of steel. The tighter the setting, the smaller the output size and the lower the throughput capacity.
As a compression crusher, jaw crushers generally produce the coarsest material because they break the rock by the natural inherent lines of weakness. Jaw crushers are an excellent primary crusher when used to prepare rock for subsequent processing stages.
Although the chamber is round in shape, the moving piece of steel is not meant to rotate. Instead, a wedge is driven around to create compression on one side of the chamber and discharge opening on the opposite side. Cone crushers are used in secondary and tertiary roles as an alternative to impact crushers when shape is an important requirement, but the proportion of fines produced needs to be minimized.
An impact crusher uses mass and velocity to break down feed material. First, the feed material is reduced as it enters the crusher with the rotating blow bars or hammers in the rotor. The secondary breakage occurs as the material is accelerated into the stationary aprons or breaker plates.
Impact crushers tend to be used where shape is a critical requirement and the feed material is not very abrasive. The crushing action of an impact crusher breaks a rock along natural cleavage planes, giving rise to better product quality in terms of shape.
Most aggregate producers are well acquainted with the selection of crushing equipment and know it is possible to select a piece of equipment based solely on spec sheets and gradation calculations. Still, theoretical conclusions must always be weighed against practical experience regarding the material at hand and of the operational, maintenance and economical aspects of different solutions.
The duty of the primary crusher is, above all, to make it possible to transport material on a conveyor belt. In most aggregate crushing plants, primary crushing is carried out in a jaw crusher, although a gyratory primary crusher may be used. If material is easily crushed and not excessively abrasive, an impact breaker could also be the best choice.
The most important characteristics of a primary crusher are the capacity and the ability to accept raw material without blockages. A large primary crusher is more expensive to purchase than a smaller machine. For this reason, investment cost calculations for primary crushers are weighed against the costs of blasting raw material to a smaller size.
A pit-portable primary crusher can be an economically sound solution in cases where the producer is crushing at the quarry face. In modern plants, it is often advantageous to use a moveable primary crusher so it can follow the movement of the face where raw material is extracted.
The purpose of intermediate crushing is to produce various coarser fractions or to prepare material for final crushing. If the intermediate crusher is used to make railway ballast, product quality is important.
In other cases, there are normally no quality requirements, although the product must be suitable for fine crushing. In most cases, the objective is to obtain the greatest possible reduction at the lowest possible cost.
In most cases, the fine crushing and cubicization functions are combined in a single crushing stage. The selection of a crusher for tertiary crushing calls for both practical experience and theoretical know-how. This is where producers should be sure to call in an experienced applications specialist to make sure a system is properly engineered.