Block jointing mortar, also known as thin-bed mortar or thin-set mortar, is a specialized type of mortar used for joining masonry blocks or units in construction. It is designed to provide a strong and durable bond between blocks while minimizing the thickness of the joint.
Block jointing mortar is typically composed of a blend of cement, sand, and polymers. The addition of polymers helps improve the properties of the mortar, such as adhesion, flexibility, and water resistance. These polymers may include additives like latex, acrylics, or redispersible powders.
The specific composition of block jointing mortar can vary based on the manufacturer and product specifications. However, the general proportions are typically around 1 part cement to 3-4 parts sand, with the addition of polymer additives. The mixture is then blended with water to achieve the desired consistency.
Block jointing mortar offers several advantages over traditional cement mortar. Some key features include:
- High adhesion: The inclusion of polymers enhances the mortar’s bonding strength, allowing for strong adhesion between the blocks and reducing the risk of joint failure.
- Reduced shrinkage: Block jointing mortar has a lower shrinkage rate compared to conventional cement mortar. This helps to minimize the development of cracks in the joints over time.
