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CONCRETE

BASICS

Concrete is a human made product, meaning, that if done properly, it will give you many years of trouble free use. However there can be many problems associated with poor finishing, and poor sub grades. There are many mixes to choose from depending on your project at hand. I will touch on the basics here.

AIR
Any concrete the will be exposed to outside, and/or that will experience freezing and thawing of the slab, must have an admixture called air. This chemical is introduced to the concrete at the time of loading. What is does it, when you concrete freezes and thaws, the surface of the concrete will experience tension, and will cause the top 2mm or so to peel off. This chemical created millions of tiny are voids. Now, when the temps change, it is the actual "air" in the concrete that takes this expansion and contraction tension, and does not damage the slab. Just tell dispatch what you are pouring, and they will make sure the correct mix is used.

STRENGTHS
Generally all outdoor work calls for a mix called 32C2. This means, 32 Mpa, which is the strength, and Class 2, meaning it is for Non-structurally reinforced (i.e. plain) concrete exposed to chlorides and freezing and thawing. Examples: garage floors, porches, steps, pavements, sidewalks, curbs, and gutters.

GRAVEL


Granular "A" Gravel
DESCRIPTION: Commonly referred to as road gravel, its primary function is as a road base. A mixture of 3/4" or less stone and sand, A Gravel compacts well and is great for use in driveways, under buildings, and anywhere concrete is going to be poured. Capable of 100% compaction, this gravel is recommended as an excellent sub base.


Recycled "A" Gravel
DESCRIPTION: Very similar to Granular "A", however incorporated into this mix is recycled concrete. Because of the crushing of the concrete, more fine particles are in the gravel, as well as cement dust. Once compacted this product forms a superior base and is perfect for pouring concrete on. Keep in mind once compacted, this material is very hard to re-grade as it packs so tight, so make it right the first round!


Chip and Dust
DESCRIPTION: This material is a by-product of crushing stone. It contains up to ¼ inch chips and finer particles that give great compaction. It is cheaper than "A" gravel, packs similar, and is a good budget alternative material to be used for a sub base. It is easy to grade, and pack.


¾" Crushed Stone
DESCRIPTION: This is not necessarily used as a sub base for concrete, but it can be used effectively. It contains no fine particles, and consists of no stone larger than ¾ of an inch. Because of the lack of fines, this product will not compact at all.


Pea Stone
DESCRIPTION: These round stones are 10mm and less. They are not a suitable sub base for concrete. They are round so will never compact. They contain no fines. Good for drainage, in gardens, are garden boxes, decorative area, etc.


Sewer Stone
DESCRIPTION: These round stones are 50mm (2 inch) and less. They are not a suitable sub base for concrete. They are round so will never compact. They contain no fines. Good for drainage, in gardens, are garden boxes, decorative area, etc. This is the preferred stone for drainage.


Concrete Sand
DESCRIPTION: This material is washed in our wash and screening plant to ensure not large pieces are in it. It will compact lightly, but since there are not enough fines it will not stay tight. This sand is used in concrete, and is not designed for a sub base.

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After many years of service in the London community, we feel confident that we can cater to your needs. We get the job done and we don't just meet expectations; we... We feel we can conquer almost any feat in this industry. In keeping with this mission, we offer a wide variety of services. No job is too big or small, as we treat each project with the same meticulous attention to detail. Our project are what set us apart form our competition. We take pride in knowing that our clients are receiving some of the best possible...