Search Results for: finishing

Introduction Shrinkage-compensating cement is a concrete mix designed to offset shrinkage as it cures. In DIY projects, it helps reduce cracking on slabs and pads. Use it when you expect movement or large flat surfaces; check product instructions for mixing and cure guidance. For rules and specifications, follow the manufacturer’s directions and any local rules.

Introduction Chloride penetration in concrete is the inward movement of chloride ions from the environment into the concrete and reinforcement area. In coastal areas, salt spray, moisture, and wet-dry cycles push chlorides into the concrete matrix. This can lead to corrosion of reinforcing steel and reduce the structure’s long-term durability. To slow chlorides down, choose

Introduction Laitance is a thin, weak surface layer of cement and fines on concrete that can ruin coatings if it isn’t removed. It often feels powdery or dusty and looks lighter or different from the surrounding concrete. If you leave laitance, coatings can fail early and moisture or dirt may trap under the finish. Removal

Introduction A bonding agent is a coating that helps new concrete grab onto old concrete, while cement slurry is a thin mix used to dampen and bridge the surface for bonding. In practice, you choose one or the other based on how you plan to join the pours and how the surface looks and feels.

Introduction A slump test measures the workability of fresh concrete by using a cone and watching how much it settles. Key takeaways Understand the slump test measures concrete consistency by observing cone collapse height. Check tools: slump cone, trowel, sampling scoop, and clean curing surface. Follow a step-by-step procedure to ensure consistent results and repeatability.

Introduction Air-entrained concrete is concrete that contains tiny air bubbles added on purpose to improve performance. These bubbles come from air-entraining agents mixed in with the concrete. This helps the concrete resist damage from freeze-thaw cycles and cracking, especially in exposed or moisture-prone spots. Testing for air content can be done with pressure, volumetric, or

Introduction Concrete bleeding is water rising to the surface of fresh concrete as the mix sets. Segregation is when heavier components separate, causing uneven texture or coverage. Both can affect finish and long‑term durability if not spotted and managed early. Bleeding shows as a wet sheen on the surface and may leave a thin film