06/09/2021
Aggregate, Gravel is it the same?
In this post I continue beyond ‘eggs’ and look at aggregate. First of all let’s get to common terminology. Aggregate is all granular material whether it is nature or processed. Gravel I will to as nature material in the ground unprocessed. The reason we need to be clear on how we refer to the material, is to get proper material for the intended purpose.
As I said in the definition aggregate is either nature or processed. Processed materials include rip rap (large stone), crushed rock, sand, base course material, drainage material, landscaping material. This is very important because one has to know the intended use, how to order the material and how to check that you got what you ordered. Processed material are much more expensive than nature material and they are produced for the intended use.
First the owner of the project must know the intended use of the aggregate so that a specification or criteria for supply can be given to the supplier of the aggregate. Once a supplier has been selected one should ask for test results of the material being supplied to make sure it meets the requirements requested. Next the owner needs to identify the amount of material to be supplied. It should be clear how this material is measured, as the cost of the material can be substantial. Typically the supplier has a scale and you should request a ticket when the material is delivered. Even if you ordered the material in yd3 or m3, a calculation can be done from the weight delivered in the truck. This is a check to validate that you received the material you ordered.
As with my analogy of buying eggs, purchasing aggregate follows the same concept and steps. So in summary:
• Know the use of the material
• Develop criteria for the material to request from the supplier
• Determine how you are purchasing (by weight or volume)
• Check the material being supplied by asking for test results and a weigh ticket from the truck delivered
This is important to be able to hold the supplier accountable and you get your value for money.
My next post will cover explaining the difference in aggregates, important criteria of each and some typical applications.
If you have questions or would like to have a discussion please contact me for a free consultation.