Yes, you absolutely can mix hydraulic cement with sand. In fact, mixing hydraulic cement with sand is a fundamental step in creating common building materials like concrete and mortar.
Understanding the Mixture
When you mix hydraulic cement with sand and add water, you create a substance that is crucial for construction. The sand acts as an aggregate, providing bulk and stability to the mixture, while the hydraulic cement, activated by water, acts as the binder, holding the sand particles together as it hardens.
What the Reference Says
According to the provided reference: "Concrete is created by mixing hydraulic cement, water and aggregate, such as sand or gravel". This clearly states that sand is an aggregate commonly mixed with hydraulic cement and water to form concrete. The reference further explains that hydraulic cement "sets and hardens by reaction with water," highlighting the role of water in the process.
What You Create
Mixing hydraulic cement with sand and water forms different materials depending on the proportions and the presence of other aggregates like gravel:
- Concrete: A mix of hydraulic cement, sand, gravel (coarser aggregate), and water.
- Mortar: Typically a mix of hydraulic cement, sand (finer aggregate), and water, used to bind bricks, stones, or concrete masonry units together.
Why Proportions Matter
The reference notes that "the proportions of these ingredients are important because they determine the strength and durability of the finished product." Using the correct ratio of cement, sand (and gravel, if making concrete), and water is essential to achieve the desired strength, workability, and durability for your specific project. Too much water can weaken the mix, while too little makes it difficult to work with and may prevent proper hardening.
Key Components for Concrete/Mortar
To make concrete or mortar using hydraulic cement and sand, you need:
- Hydraulic Cement: The binding agent that hardens when mixed with water.
- Sand (Aggregate): Fine aggregate that adds volume and strength.
- Water: Reacts with the cement to cause hardening (hydration).
- Optional: Gravel (Coarse Aggregate): Used in concrete for bulk and increased strength.
Mixing hydraulic cement with sand is not just possible; it's a standard practice in construction that forms the basis for durable structures.
