Common problems in masonry mortar mix ratio
In the actual construction process, various challenges and problems are often encountered, and these problems are mainly concentrated in several aspects:

① The amount of sand used in mortar does not meet the standard.

According to the technical standards in the industry. The preparation of masonry mortar must follow the principle of precise proportioning. To ensure that its performance and quality meet the design requirements. In particular, the selection of sand in the mix ratio needs to be strictly controlled. The regulations clearly require the use of medium sand. This is because its particle size and gradation can better combine with other materials such as cement to form a stable mortar structure.
At the same time, the control of mud content is also a crucial link. If the mud content in the sand is too high. It will not only affect the workability and adhesion of the mortar. It may also cause quality problems such as cracking in the masonry body.
Therefore, the technical standards strictly limit the mud content to less than 5%. To ensure that the quality and performance of the mortar are not damaged. In reality, there are many illegal companies that take non-compliant substitution behaviors in the preparation of masonry mortar for the sake of saving construction costs. They use fine sand or extra-fine sand to replace the medium sand specified in the standard. This kind of fine sand has a small modulus and is often prone to contain impurities. What is more worrying is that the mud content of these fine sands is sometimes as high as 8% to 12%. It is far beyond the allowable range of technical regulations and proportion standards. This practice of violating technical regulations and proportion standards not only seriously affects the quality and performance of masonry mortar. But also poses a great hidden danger to the safety and stability of the entire building.

② Randomly add admixtures that have not been verified by statutory testing agencies.

During the construction process, in order to pursue construction progress or improve certain properties of mortar. Some construction companies may tend to mix various admixtures into mortar. However, this practice has potential risks. Especially when using organic plasticizers that have not been fully verified by statutory testing agencies. The problem may be more serious. These unverified admixtures may destroy the inherent structure of the mortar, resulting in its lack of compactness, thereby reducing its overall strength. This will not only pose a threat to the safety of the construction process. But is also likely to have a direct negative impact on its waterproof performance after the building is completed. Imagine if the exterior wall of the building is windy and cold because of insufficient mortar strength. Then its overall thermal insulation performance and comfort will be greatly reduced. More seriously, this may cause the building quality to fail to meet the standards, thus affecting its service life and safety.
Common problems in masonry mortar mix proportion(Ⅱ)