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In recent decades, industrial by-products have gained significant attention for their potential as components of more environmentally friendly construction materials. In this context, this paper presents the manufacture of concrete blocks (CB), in which sand was replaced with oven-dried drinking water treatment sludge (DWTS). In addition, CB with DWTS contents ranging from 0% to 30% by weight were exposed to early-age carbonation curing. Experiments were conducted to determine the compressive strength, splitting tensile strength, and water capillary absorption of CB subjected to normal or early-age carbonation curing. The results indicated that DWTS degraded durability and mechanical properties of CB because of the high-water absorption and high organic content of DWTS. However, early-age carbonation curing was found to improve the overall performance of CB with DWTS, such that the carbonated CB …