High fire resistance in blocks containing coal combustion fly ashes and bottom ash

摘要: Abstract Fire resistance recycled blocks, containing fly ash and bottom from coal combustion power plants with a high fire resistance, are studied in this paper by testing different compositions using Portland cement type II, sand, coarse aggregate (up to 50% of total weight) 30% weight). The physical–chemical (density, pH, humidity, water absorption capacity), mechanical (compressive flexural strength), leaching properties measured on blocks made proportions ash. standard test is reproduced 28 cm-high, 18 cm-wide 3 cm-thick units, as the time needed reach temperature 180 °C non-exposed surface for compositions. results show that replacement fine have remarkable influence cause no detriment product. Additionally, according tests, environmental problems been detected These lead an analysis recycling possibilities these by-products useful construction applications passive protection against fire.