Fixation of Coal Fly Ash (CFA) in the Form of Construction Blocks with Variable Combinations of Lime and FGD Gypsum

Coal fly ash (CFA) is produced on very large scales in thermal energy plants. The recycling of coal fly ash (CFA) is essential decreasing its environmental impact. In this research, a FaL-G (coal fly ash (CFA), lime, and FGD gypsum) technology is used to reuse coal fly ash (CFA) in brick-type form. First, all of the small-grained FaL-G were dried in the oven at 60and#176;C for 24 h. Three different combinations of coal fly ash (CFA), FGD gypsum, and lime were tested for block preparation. The blocks were treated with five conditions for hardening and drying, i.e., i. Sunlight, ii. Shade (room temperature), iii. Oven, iv. Presence of moisture, and v. Freezer (-16and#176;C). After complete drying, the compressive strength and flexural strength tests were applied. Over all, the sunlight treated blocks showed strong compressive strength of 5.9 MPa and flexural strength of 7.19 MPa. The blocks made through FaL-G technology are very good raw materials for construction, i.e., partition walls and decoration, as these blocks have impressive texture and plain edges. It was the first time that the variable combinations of coal fly ash (CFA), gypsum, and lime were tested through different conditions and have achieved good strength. The literature showed that little work has been carried out through FaL-G, while additional materials have also been used. The main novelty of the current research work is development of an enhanced technique for preparing building materials, stabilizing coal fly ash (CFA), and reducing its environmental hazards