What Causes A Void In Concrete?

Concrete is known for its high compressive strength, as well as tensile strength when it is combined with steel; that’s why it’s used so widely in architecture, home foundations, pavements, bridges and overpasses, highways, parking structures, and dams. Despite the material being strong and versatile, concrete also has a common problem: the tendency to develop voids and cracks which can be repaired through concrete void filling and crack injections.

Surface concrete voids are the shallow holes or cavities that appear on the surface of concrete castings. The holes aren’t aesthetically pleasing and could eventually lead to further damage to the concrete, which is why concrete experts like KC Concrete Care suggest that you have a professional fix the issue with concrete void filling.

Even with concrete void filling as a solution, you should know what causes a concrete void so that you can help mitigate the factors that damage your concrete.

Water – When water is trapped against the concrete mold’s working surface, it eventually forms voids that should be eradicated by concrete void filling. The voids appear when the concrete cures and the remaining water evaporates, leaving behind a cavity on the casting surface. Generally, most voids that are as a result of water are contributed by the high water to cement ratio. If the water creates enough pits, then you should have a professional complete concrete void filling.

Release Agents – Release agents are lubricants between the concrete casting and the mold that must be appropriately applied to yield concrete castings without voids. The voids occur when the release agent is excessively applied, forming puddles on the lowest portions of the mold. As the concrete is poured into the mold the puddles make it impossible for the concrete to fill in all the detail, leading to a need for concrete void filling. Once the casting is taken off, voids are noticeable in the puddled areas. Vibration intensifies this issue by pushing more of the release agent into the mold’s lower regions. You can recognize voids caused by release agents by their spherical shape. If you identify voids like these, contact an expert for concrete void filling.

Air – When air is stuck between the mold surface and concrete, concrete voids are created, necessitating concrete void filling. You can usually find air voids in low slump concrete and under non-spherical segments of crushed aggregate because not enough mortar was used to fill the gaps. Concrete voids caused by air are irregularly-shaped and bigger than their counterparts, so they should be remedied with concrete void filling.

Poor Installation Work – Concrete surface voids are mostly a result of shoddy workmanship while casting the concrete. To avoid cracks and concrete void filling altogether, be sure to hire a seasoned professional for your concrete projects!

Eliminate Cracks With Concrete Void Filling – Concrete void filling will eliminate unsightly concrete voids that can cause further damage to your concrete if they persist. If you have a concrete void issue your local concrete contractors can help with your concrete repair needs.

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