Some common triggers of concrete flaking are related to construction defects. It can be improper preparation of reinforcing steel, incompatible supporting metals, metal bars placed too close to the surface, stress fractures due to excessive weight, insufficient concrete cover or poorly poured concrete. One of the many reasons why concrete flaking occurs is due to the natural process called carbonation. Water immediately seeps into the concrete and causes other elements, especially the reinforcing bars embedded in the concrete, to corrode.
Thus, it creates bulges and cracks on the surface of the concrete. Steel reinforcing bars are often used in concrete to provide durability. In addition, poor quality steel can lead to chipping. Air entrainment is the introduction of small air bubbles into concrete by adding an air retention agent, a surfactant (a type of chemical that includes detergents), or a portland cement that incorporates air into concrete in an appropriate amount.
For new concrete, apply a penetrating waterproofing sealant 28 days after the concrete is laid and every few years thereafter. He has extensive experience in the inspection, replacement, evaluation and forensic analysis of buildings and construction structures made of wood, concrete and steel. What is not acceptable and can be avoided is surface cracking, called “shrinkage cracking”, and chipping due to poor design, placement and finishing of the mixture. However, the most common cause of chipping is corrosion of embedded steel reinforcing bars or steel sections.
Water seeps into the concrete and causes rebar and other elements embedded in the concrete to corrode, creating cracks and bumps on the concrete surface. If entrained air bubbles are not present near the concrete surface to act as an internal pressure relief system, hydraulic pressure can easily overcome the tensile strength of the surrounding cement paste. Chipping is the peeling or detachment of small particles of cement paste from the portion close to the surface of the finished slab. So, what exactly is chipping? What are their effects and how can structures be successfully repaired and further corrosion prevented? As ambient and concrete temperatures change during placement, be flexible to change dosing rates.