Concrete incorporating high-calcium fly ash and EAF slag aggregates

Abstract

Concrete mixtures with high volumes of electric arc furnace slag as aggregates and high-calcium fly ash as part of the binding system were produced and tested for their properties. The properties tested included strength development, microstructure and abrasion resistance, and the results were compared to those of conventional concrete. Results showed that compressive strength levels equal to or higher than those of conventional concrete can be achieved by using more than 90% by mass industrial by-products in the concrete mixture. These concretes of greater unit weight have shown very good aggregate-matrix transition zone and abrasion resistance, which makes them particularly suitable for pavement applications. The possibility of heavy metals leaching was also tested using a tank-leaching test, which showed minimal risk from the incorporation of electric arc furnace slag and high-calcium fly ash in concrete.

Steel furnace slag aggregate expansion and hardened concrete properties

“…However, these two SFS aggregate sources reduced the split tensile strength relative to the control concrete. These findings agree with the literature in that SFS aggregates can increase [18,20,22,34,42,56,57,[67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86] or decrease [16,59,[87][88][89] the compressive strength and similarly increase [18,20,22,42,57,70,[72][73][74]76,79,82,85,90,91] or decrease [75,80,89] …”

“…Since the ethylene glycol also dissolves Ca(OH) 2 , thermal analysis can be used in conjunction with complexometric titration to better refine the free CaO content determination of SFS [31,33,36,38,39,42,43]. For this study, thermogravimetric analysis (TGA) was conducted to determine the hydroxide and carbonate contents in the SFS.…”

Zepa beltzezko hormigoi armatuz fabrikatutako habeen makurdura-esfortzuaren aurreko analisia

“…Asko izan dira zepa beltzei buruz egindako azterketak azken urteotan [5][6][7][8][9]. Hainbat ikertzaile frogatu dute material ona dela agregakin bezala erabiltzeko bai hormigoietan [10,11]bai nahaste bituminosoetan [12].…”

Performance of steel-making slag concrete reinforced with fibers

“…So, an outdoor weathering and some additional cautions are necessary to prevent the occurrence of any expansive phenomena [2][3][4][5][6]. In the last decades, important works on EAFS [7][8][9][10] and LFS characterization [11][12][13] have been published; it has been demonstrated the suitability of both slags in different applications, such as bituminous mixtures [14][15][16][17][18], concrete and mortars [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34], selfcompacting concrete [35][36][37], making clinker [38], soil stabilization [39][40][41] and others [42,43]. Despite these recycling possibilities, in Spain, approximately 23% of the electric slag is accumulated in landfill sites.…”