Causes of voids on the surface of concrete products

What Voids on the Concrete Surface Look Like

The creation of smooth and durable construction elements requires adherence to strict technology. Sometimes after removing the formwork, the master sees defects in the form of small depressions. Voids on concrete spoil the appearance of the finished product and reduce its reliability.

High-quality preparation of the mortar helps avoid many problems with the quality of finished blocks. Masters carefully select components for mixing and control the amount of water. Violation of the mixture proportions often leads to the formation of pores and defects. Builders monitor the homogeneity of the mortar before starting work.

Why Voids Appear in Concrete

Defects in concrete products always have specific technical causes. Air that remains inside the mass does not have time to escape before hardening. This happens due to too fast setting of the mortar or poor mobility of the mixture. Incorrectly selected components also worsen the overall structure of the material.

For reliable production of construction elements, modern ABS molds for mortar pouring are often used. Each individual ABS mold allows creating products of correct geometry. The smooth surface of such matrices reduces adhesion to the mixture. This helps avoid mechanical damage during demolding.

How Hidden Voids Arise in Concrete

Internal flaws of the material are dangerous because they are not always visible immediately after demolding. Water, getting into such microcracks, freezes in winter and destroys the product from the inside.

The causes of internal defects are usually associated with the following factors:

• air entering the batch due to insufficient mixing of components;
• excess water in the mortar, which leaves voids upon evaporation;
• rapid setting of the mixture due to high ambient temperature;
• poor lubrication of the inner walls of the matrices before pouring the mortar.

Eliminating these factors can significantly improve the quality of manufactured products. Masters try to strictly comply with the recipe and all technological regulations.

Why Compaction of the Concrete Mixture is Important

Quality removal of air from the mortar is the main key to obtaining a monolithic structure. Simple pouring of the mixture into the formwork does not guarantee complete filling of all corners. That is why vibration of concrete is actively used in production.

For high-quality compaction of the working mass, the following actions are performed:

• uniform pouring of the mortar over the entire area of the matrices;
• turning on vibration equipment immediately after filling the mold;
• maintaining the optimal operating time for complete air release;
• monitoring the level of mixture shrinkage during the compaction process.

Additional control of each production stage allows completely eliminating the risk of defects. The Stroytekhnik company offers reliable equipment for working with construction mixtures. Experienced specialists will help you choose everything necessary for a quality production process.