Properties of Self-Compacting Mortar Mixed with Sandblasting Waste and Calcium Carbonate Powder

Abstract

Sandblasting is a process to free an object's surface of dirt, corrosion, paint, or coatings. It is used extensively in the shipbuilding and maintenance industries, bridge maintenance, and military operations. This efficient, economical method creates considerable waste. This research studied the properties of self-compacting mortar mixed with sand waste from the sandblasting process by replacing fine aggregate with sandblasting waste at ratios of 0, 20, 40, 60, 80, and 100 percent by weight, respectively, and mixed with calcium carbonate powder at a cement replacement ratio of 10 percent by weight. All mixes had a controlled slump diameter in the range of 25±5 cm. Tested the slump flow and hardened mortar properties, including compressive and flexural strengths, at a maximum curing time of 90 days. Results showed that the compressive strength of mortar made with 60% sandblasting waste replacement mixed with 10% calcium carbonate powder replacement had a maximum compressive strength and a flexural strength value of 673.60 and 82.43 ksc at 90 days of curing, higher than the controlled mortars 8% and 25%, respectively. While the water absorption tends to decrease when the sandblasting waste replacement increases.