How do you formula a hollow block filled with cement?

To create a hollow block filled with cement, start by designing a mold that includes the desired dimensions and hollow sections. Mix cement with sand and water to form a concrete mixture, ensuring the right consistency. Pour the mixture into the mold, filling the hollow sections, and then vibrate or tap the mold to remove air bubbles. Allow the block to cure for at least 24-48 hours before demolding and letting it cure further to achieve maximum strength.