In our case study article, we mention that 5000 PSI concrete was used to finish the elevated walkway at Dexter Southfield School.
Concrete is made up of three main ingredients: water, Portland cement and aggregates. The ratio of ingredients changes the properties of the final product, allowing the engineer to design concrete to meet specific needs. Admixtures can be added to adjust the concrete mix to specific performance criteria.
The best concrete mix ratio
Concrete is one of the most versatile and widely used building materials in the world. It is very strong, durable, long lasting and surprisingly affordable. You can make it from natural materials found almost anywhere on Earth. Masons have used it for centuries to build some of the greatest structures ever built. Small patios and counters in dams and large-scale buildings are all concrete. It is a highly workable material that can take any form it is poured into. And it has extremely high compressive strength which is measured in PSI or pounds per square inch. The concrete PSI level can be adjusted by varying the concrete ingredients and their ratios. This is called the mix ratio of concrete.
Concrete is made up of 3 main dry ingredients: cement, sand and stone. These 3 ingredients are mixed together to form dry concrete, which is what you will find in a bag of Quikrete. When water is added to the mix, it reacts with the cement to form a paste that eventually hardens. As the concrete dries, it becomes stronger, which is called hardening.
Special concrete is made up of different aggregates of varying qualities, which makes it more suitable for specific uses. Here are three examples:
Pump Mixes: Pump mixes create a placement with mechanical pumps with a pressurized hose to reduce blockage. Pump mixes can be pumped when wet and may have larger aggregate than standard mixes.
Flexural strength of concrete
Flexural strength is used as another indirect measure of tensile strength. It is defined as a measure of an unreinforced concrete slab or beam to resist failure in bending. In other words, it is the ability of concrete to resist bending.
The flexural strength is usually between 10-15% of the compressive strength, depending on the specific concrete mix.
Used in special construction applications, including some large-scale commercial and industrial properties, 5,000 PSI can withstand severe impact and extreme wear.
These are general rules and each scenario and usage will vary. Relatively higher strength concrete can be used for any job, but is not always necessary. And using a lower PSI concrete saves money. Just make sure your local building code allows the strength of concrete for the specific project you are planning.