This is especially true when it comes to one of the basic building materials in ready mix concrete asphalt masonry and hardscaping types of stone.
We all know a stone when we see one and we know they are important in construction but what specific roles do they play in different construction projects.
In this article we are going to take a deep dive into the types of crushed stone and gravel how they are made and their basic applications You may not be a quarry expert at the end but you will understand the basics for your next concrete or hardscaping project.
Are you ready to learn more about gravel and crushed stone Lets get started.
By the simplest definition crushed stone is as basic as it sounds Stone that has been crushed.
Most crushed stone is produced in quarries and is crushed when machinery breaks up and crushes larger rocks Instead of being shaped or formed naturally such as in a riverbed or canyon crushed stone is produced with man made machinery and processes.
It begins with using a rock crusher in a quarry or site with plenty of large rocks There are many types of crushers but their main job is the same Crush larger rocks into smaller pieces to be used for construction material.
Crushed stone is then passed through different screeners to be organized and stored in different piles according to their size The screening process starts by removing larger stones then medium stones and eventually goes all the way down to the stone dust.
This screening is important because contractors need very specific types of crushed stone to complete different types of projects For example you dont want large stones in ready mix concrete and you dont want stone dust in drainage systems.
The base is a layer that also consists of crushed stone but slightly smaller stones than the sub base In some cases stone dust or stone fines will be mixed with the aggregate to reduce voids and will hold the layer in place better.
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Road and patio base layers can benefit from using both crushed stone and gravel Road base layers such as what youd find on a gravel road or driveway often use a top layer of 190 inch aggregates Sub base layers immediately below the road driveway or patio top layer are usually 1 189 to 3 inches.
The nominal maximum size for uncrushed material is 53mm and for crushed 37 5 or 26 5mm G5 Sub Base Material is used as filling and a base coarse under roads and paving This material may contain approved natural fines not obtained from parent rock The nominal maximum size for uncrushed material is 63mm and for crushed 53mm.
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