What's the Difference Between Hydraulic and Non-Hydraulic Cement

Posted On Monday, 24 October 2022 20:22

Whether you’re constructing a small structure from the ground up or you have an upcoming house repair/remodel project, choosing the right materials is an important part of the preparation for success. And especially if you’re working with bricks, paving, or even tiles, cement will likely be among the first materials you budget for.

You will also need to choose one of the two most common types of cement, these being hydraulic and non-hydraulic. Well, it pays to know that the two have several differences, including their composition, and how long each option takes to set. To help you decide which option to choose, below is an overview of how hydraulic and non-hydraulic cement differs.

1. Composition 

The first major difference between the two cement options is the constituent elements used in making the product. For starters, hydraulic cement is made up of a mixture of limestone, gypsum, and clay. On the other hand, non-hydraulic cement contains oxychloride in addition to limestone and gypsum plaster. Nonetheless, both options can be mixed with sand and gravel to create what is known as concrete, often used in foundations, columns, and other parts of a structure that demand superb strength.

2. Cement Hardening and Setting 

As earlier hinted, the other major difference between the two options of cement is the amount of time required for the cement to harden or set once mixed with water and other elements.

Hydraulic cement hardens when a chemical reaction occurs between water and the anhydrous cement powder, forming water-insoluble hydrates, meaning that it can retain strength and hardness even under water. Nonhydraulic cement, on the other hand, hardens through carbonation – where its components react with the CO2 present in the air.

In general, hydraulic cement takes less time to set and strengthen compared to its non-hydraulic counterpart. Hydraulic cement will start hardening as soon as it is applied, making it a better alternative for time-sensitive projects.

How Fast Does Hydraulic Cement Set? 

Perfect for use in structural concrete and masonry, one of the biggest perks of hydraulic cement is that as long as it’s mixed well and the right consistency attained, it can set within as little as 5 minutes or less.

After setting, it completely seals water from penetrating through the structure. This is why it’s often ideal for construction and repair applications such as:

3. Conditions for Drying 

Additionally, the two options for cement may differ in terms of the conditions needed to dry and strengthen once installed. For instance, non-hydraulic cement requires dry conditions to harden and strengthen. This means that it might take days if not weeks for the cement to completely dry up and strengthen in moist or rainy weather. 

On the other hand, hydraulic cement has a major advantage in that it doesn’t necessarily require dry conditions to set and strengthen. This means that it provides more versatility in terms of the weather conditions during which it can be successfully applied and the project completed. 

4. Durability 

As long as they are properly applied and allowed the right conditions to cure, both hydraulic and non-hydraulic cement can provide a decent life. This means that they can both help enhance the value of your property when used in repairs or remodels. However, when comparing the two cement types, hydraulic cement has a slight edge over its non-hydraulic counterpart in terms of durability.

For instance, the amount of cement required to strengthen a structure is much less when hydraulic cement is used than when non-hydraulic cement is used.

If you’re looking for a more versatile option in cement, then hydraulic cement should be your choice. However, if you don't mind waiting for a while for the cement to harden under dry weather, then non-hydraulic cement can be an option. The latter is also much more likely to be cheaper to procure.

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