Concrete Coring Test

When it comes to concrete core testing, there are three crucial steps involved: finishing, capping, and testing. Here’s a brief description of each step:

Finishing: After extracting a core sample from a concrete structure, the exposed ends of the core need to be finished to ensure a smooth and even surface. This can be done using a grinding machine or by hand grinding with abrasive stones or sandpaper. The goal is to remove any irregularities or protrusions that could affect the accuracy of subsequent tests.

Capping: Capping is the process of providing a flat and perpendicular surface to the ends of the concrete core sample. This step is necessary to ensure uniform distribution of load during testing and to prevent any localized stress concentration. Capping materials, such as sulphur mortar or high-strength gypsum-based capping compounds, are commonly used to create a smooth and stable surface on the ends of the core.The capping process involves preparing the capping material, placing it on a flat surface, and positioning the core sample on top of it. The capping material is then carefully poured around the core and allowed to cure according to the manufacturer’s instructions. Once the capping material has set, it is usually trimmed and levelled to achieve a precise and even surface.

Testing: The final step is to test the concrete core sample for various properties, such as compressive strength, density, permeability, and durability. The most common test conducted on concrete cores is the compressive strength test, which provides an indication of the concrete’s load-bearing capacity.To perform the compressive strength test, the capped core sample is placed in a compression testing machine, aligned vertically, and loaded gradually until it fractures. The maximum load at failure is recorded, and the compressive strength is calculated based on the cross-sectional area of the core.Other tests, such as the water absorption test, chemical analysis, and petrographic examination, can also be conducted on concrete cores to assess its quality, durability, and suitability for specific applications.