بررسي بتن‌ حاوي پوزولان كاشي ضايعاتي به همراه ميكروسيليس

Investigations into the Mechanical Properties of Concrete Containing Ceramic Floor Tile and Silica Fume

در اين مطالعه‌ي آزمايشگاهي، ابتدا به بررسي خواص پوزولاني كاشي‌هاي ضايعاتي پرداخته شده و پس از تاييد خواص پوزولاني، پودر كاشي با مقادير مختلف در بتن استفاده و خواص بتن حاوي اين پوزولان اندازه‌گيري شده است. در بخشي ديگري از آزمايش، به بررسي خواص بتن حاوي پوزولان كاشي ضايعاتي به همراه ميكروسيليس پرداخته و اثر هم‌زمان اين دو ماده بررسي شده است. نتايج نشان داده است كه كاشي ضايعاتي داراي خواص پوزولاني مطلوبي است و تا 20% استفاده در بتن، اثر سو قابل توجهي در عملكرد بتن ندارد. همچنين استفاده‌ي هم‌زمان ميكروسيليس به همراه پوزولان كاشي اثر دو چندان دارد و ميكروسيليس مي‌تواند نقص احتمالي ناشي از مصرف پوزولان كاشي را به خوبي پوشش ‌دهد. در پايان با توجه به ضايعاتي‌بودن ماده‌ي اوليه، اثرات زيست‌محيطي و اقتصادي استفاده از اين پوزولان در بتن نيز مورد بررسي قرار گرفته است.

Millions of tons of waste are produced each year, most of which is not recyclable or whose recycling process is extremely energy-consuming or polluting. Also, dumping these materials in the countryside has doubled the dangers to the environment. Recycling worn-out materials and using them in concrete making is a good strategy to attain the two goals of getting rid of waste and making high quality concrete. It is a good option for use in concrete as waste ceramic tile has an extremely resistant structure, a physical nature that cannot be processed in any recycling system and the fact that it is produced in huge amounts. Through this study, it is intended to survey the effect of waste ceramic tile powder on the mechanical properties of concrete. First, the waste ceramic tile provided from companies is milled at 325 meshes. After the pozzolan qualities of materials are confirmed and related standard controlled, concrete samples with 10–40 percent of pozzolan substitution are made, and some physical and mechanical qualities are measured for different curing ages. The synchronous effect of silica fume is surveyed, as well as ceramic pozzolan. It had been deduced through measuring the compressive strength of the mentioned samples that substituting ceramic pozzolan for 30 percent of concrete would slightly decrease resistance long term. In addition to its slight decrease of resistance, using ceramic pozzolan considerably decreases the amount of water absorption. With only 5 percent of silica fume, the defects due to ceramic pozzolan usage could be eliminated from concrete. Eventually, after considering economical and environmental aspects, as well as taking concrete qualities into account, it was proven that ceramic pozzolan is suitable for making concrete, and that silica fume could be used to improve the qualities of pozzolan concrete.