ASTM C823/C823M is the ASTM standard titled Standard Practice for Examination and Sampling of Hardened Concrete in Constructions, and it provides practical guidance for evaluating concrete already in place. It is commonly used when a project calls for careful sampling or examination of existing hardened concrete to support assessment, investigation, or quality-related decisions. By helping standardize the approach, it supports more consistent results and clearer technical communication.

Overview of ASTM C823/C823M

This practice focuses on how hardened concrete in structures or other constructions is examined and sampled. ASTM C823/C823M is intended to guide users in obtaining representative information from concrete that has already been placed and hardened, rather than from fresh material. That makes it relevant when the condition, composition, or performance of existing concrete needs to be understood for engineering review, compliance work, or related technical evaluation. The standard helps keep the process organized and consistent.

Common use cases of ASTM C823/C823M

This standard is commonly used during investigations of existing concrete in buildings, bridges, pavements, and similar constructions where hardened material must be checked. It may support sampling plans, examination procedures, or follow-up testing related to condition assessment and materials evaluation. ASTM C823/C823M is especially useful when a project needs a structured way to collect concrete samples or observe material characteristics in place, while keeping the process aligned with a recognized ASTM practice.

Benefits of using ASTM C823/C823M

Using ASTM C823/C823M can improve consistency in how hardened concrete is examined and sampled, which is important for reliable reporting and technical comparison. It helps support quality control, compliance efforts, and informed decision-making by establishing a recognized practice for working with in-place concrete. For owners, engineers, laboratories, and inspectors, the standard may also reduce uncertainty during procurement or evaluation by creating a clearer basis for collecting and reviewing evidence from existing construction.

• Examination of hardened concrete in construction
• Sampling guidance for existing concrete
• Support for assessment and investigation work
• Consistent technical practice for in-place material review