Estimation of Concrete Compressive Strength Using the Drilling Powder Method

Nondestructive testing (NDT) techniques are extensively used to estimate the compressive strength of concrete structures owing to their noninvasiveness and suitability for continuous monitoring. However, their accuracy is often limited by surface conditions, moisture content, and the presence of aggregates. This study investigates the drilling powder method as an alternative for improving the accuracy of compressive strength assessment while minimizing damage. Concrete specimens with varied properties were prepared, and powder samples were collected using a 4-mm drilling bit. The collected powder underwent acidic treatment to isolate the cement paste and assess its porosity. The relationship between cement paste porosity and compressive strength was then analyzed. A strong correlation (coefficient of determination of up to 0.93) was found between powder porosity and compressive strength in ordinary portland cement concrete. These findings suggest that the drilling powder method offers a reliable, minimally invasive approach for estimating concrete strength and may help overcome key limitations of conventional NDT techniques.