Scholarly record
THE INFLUENCE OF THE USED FOUNDRY SAND AND WASTE FROM PIPE BLASTING ON THE QUALITY OF CONCRETE
Abstract
Concrete is a building material composed of aggregate, cement and water. Aggregate forms a filler, cement, after mixing with water, creates crystals that connect the aggregate with a firm and flexible bond. Cement slurry gradually loses its plasticity and begins to solidify and harden, until it finally turns into cement stone. Quartz sand is most often used as aggregate. Concrete is a building material composed of aggregate, cement and water. Aggregate forms a filler, cement, when mixed with water, forms crystals that connect the aggregate with a firm and flexible joint. Cement slurry gradually loses its plasticity and begins to solidify and harden until it finally turns into cement stone. Quartz sand is most often used as aggregate. The largest amount of waste in the foundry is represented by used foundry sand, It is actually siliceous sand with a binder, which is most often bentonite. Approximately 100 million tons of used foundry sand are produced annually worldwide. Up to two thirds of used foundry sand are disposed of in landfills. Used foundry sand represents more than 80-90% of the waste produced by the foundry. The disposal of this waste requires relatively high costs. Quartz sand is used as a blasting medium for pipe blasting, which is contaminated by the blasted material after completion. The waste material from this process contains a high proportion of SiO2 and ends up in a landfill. This contribution deals with the replacement of quartz sand in concrete with used foundry sand and waste from pipe blasting. In addition to new sand, used foundry sand or waste from pipe blasting, the concrete mix contained cement and water. The used molding mixture and blasting waste gradually replaced quartz sand in amounts of 0, 5, 10, 15, 20, 25, 30, 40 and 100%. Cubes and blocks were formed from the concrete mixture, which were tested for compressive strength, flexural strength and hardness, and the influence of the amount of waste on compressive strength and flexural strength was monitored.
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