Matches in UGent Biblio for { ?s ?p Blast-furnace slag (BFS) is a by-product of the steel production with latent-hydraulic properties and can therefore be added to the concrete as a cement replacing material. However, the durability behaviour of concrete containing BFS is different from that of ordinary Portland cement (OPC) concrete. In this study, the acid resistance of concrete containing BFS is investigated by performing accelerated degradation tests which simulate quite well the deterioration process in animal houses. Cylindrical test specimens were subjected to a cyclic procedure of turning through acetic and lactic acid and drying by air. Every 7 days (1 cycle), the specimens were brushed and the change in radius was measured. The measurements were performed on OPC concrete and concrete with BFS-to-binder ratios of 50 %, 70 % and 85 % at an age of 1 and 6 months. The results show that concrete with BFS is much more resistant to acid attack than the OPC concrete. To explain the different behaviour of concrete containing BFS in comparison with OPC concrete, the porosity and Ca(OH)2 content of these mixtures were investigated. These two parameters are main factors in the degradation process since the porosity influences the extent to which the acids penetrate into the concrete and the Ca(OH)2 content determines the possibility to produce soluble calcium salts. To investigate the pore structure, vacuum saturation tests were performed. With increasing BFS content, the total pososity increases slightly, whereas the capillary porosity decreases. This indicates that BFS concrete shows a finer pore structure. Furthermore, thermogravimetric analyses were performed to determine the Ca(OH)2 content of the concrete samples at different ages. Since Ca(OH)2 is available to a smaller extent in BFS concrete, this contributes towards a better acid resistance.. }
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- aggregation abstract "Blast-furnace slag (BFS) is a by-product of the steel production with latent-hydraulic properties and can therefore be added to the concrete as a cement replacing material. However, the durability behaviour of concrete containing BFS is different from that of ordinary Portland cement (OPC) concrete. In this study, the acid resistance of concrete containing BFS is investigated by performing accelerated degradation tests which simulate quite well the deterioration process in animal houses. Cylindrical test specimens were subjected to a cyclic procedure of turning through acetic and lactic acid and drying by air. Every 7 days (1 cycle), the specimens were brushed and the change in radius was measured. The measurements were performed on OPC concrete and concrete with BFS-to-binder ratios of 50 %, 70 % and 85 % at an age of 1 and 6 months. The results show that concrete with BFS is much more resistant to acid attack than the OPC concrete. To explain the different behaviour of concrete containing BFS in comparison with OPC concrete, the porosity and Ca(OH)2 content of these mixtures were investigated. These two parameters are main factors in the degradation process since the porosity influences the extent to which the acids penetrate into the concrete and the Ca(OH)2 content determines the possibility to produce soluble calcium salts. To investigate the pore structure, vacuum saturation tests were performed. With increasing BFS content, the total pososity increases slightly, whereas the capillary porosity decreases. This indicates that BFS concrete shows a finer pore structure. Furthermore, thermogravimetric analyses were performed to determine the Ca(OH)2 content of the concrete samples at different ages. Since Ca(OH)2 is available to a smaller extent in BFS concrete, this contributes towards a better acid resistance.".