Astm C642 Density Absorption Voids In Hardened Concrete Verified -

Armed with ASTM C642 data, the owner rejected the deck. The contractor demolished and repoured. The test cost less than $500 per core. The replacement cost $2.3 million. Concrete is not a rock. It is a manufactured geology, and its performance depends entirely on the geometry of its emptiness. ASTM C642 is not glamorous. It involves no high-speed cameras or finite element models. It is just a scale, an oven, a boiling pot, and a calculator.

| Property | Typical Value | | :--- | :--- | | Dry Density | 125 – 155 lb/ft³ (2000 – 2480 kg/m³) | | Absorption | 4 – 8% | | Permeable Voids | 12 – 18% | astm c642 density absorption voids in hardened concrete

[ D_dry = [A / (B-C)] \times \rho_water ] What it means: The mass of solid concrete per unit volume, including pores. A low dry density might indicate lightweight aggregate or excessive voids. Armed with ASTM C642 data, the owner rejected the deck