Filtreler
Use of granulated blast-furnace slag in concrete as fine aggregate

Yüksel I. | Özkan Ö. | Bilir T.

Article | 2006 | ACI Materials Journal103 ( 3 ) , pp.203 - 208

This paper reports the results of some experimental studies on the use of non-ground-granulated blast-furnace slag (NGGBFS) as fine aggregate in concrete. Two groups of concrete samples were produced. The NGGBFS/sand ratios were 0% (reference), 25, 50, 75, and 100%. The first group (C1) contains only 0 to 7 mm (0 to 0.276 in.) sand as fine aggregate. The second group (C2) contains two sub-types of fine aggregates that are 0 to 3 mm (0 to 0.118 in.) and 0 to 7 mm (0 to 0.276 in.) sands. NGGBFS replaces 0 to 7 mm (0 to 0.276 in.) sand in both groups. Strength and durability characteristics of concrete were compared with respect to con . . .trol samples and vice versa. According to the results, if the NGGBFS/ sand ratio is high in the C1 type, the concrete is porous and has relatively low compressive strength. In the C2 type, however, concrete strength and durability characteristics were better than those in the C1 type. It was concluded that the non-ground-granulated blast-furnace slag can be used as fine aggregate under some conditions. Copyright © 2006, American Concrete Institute. All rights reserved Daha fazlası Daha az

Effect of aggregate type on mechanical properties of reactive powder concrete

Aydin S. | Yazici H. | Yardimci M.Y. | Yigiter H.

Article | 2010 | ACI Materials Journal107 ( 5 ) , pp.441 - 449

This paper focuses on the experimental study of the mechanical properties of reactive powder concrete (RPC) produced with different aggregates, such as korund, basalt, limestone, quartz, sintered bauxite, and granite. The effects of aggregate type on mechanical properties were investigated under standard, atmospheric, and high-pressure steam curing. The test results indicate that very high compressive strength can be achieved even with low-strength or smooth-surface aggregates; however, superior flexural performance requires high-strength aggregate with rough surface characteristics. A compressive strength of approximately 200 MPa ( . . .29 ksi) can be obtained when strong and rough-surface textured aggregate were used under standard curing conditions. Atmospheric and high-pressure steam curing improved the compressive strength significantly. These curing regimes, however, did not considerably improve the flexural performance. Pressure application in fresh state resulted in a great improvement of the compressive strength of RPC, particularly in the case of high-strength and rough-surface textured aggregates. In this way, a compressive strength over 400 MPa (58 ksi) was obtained with bauxite aggregate after pressure application and autoclaving. Copyright © 2010, American Concrete Institute. All rights reserved Daha fazlası Daha az

Properties of concrete containing nonground ash and slag as fine aggregate

Yüksel, İsa | Genç, Ayten

Article | 2007 | ACI Materials Journal104 ( 4 ) , pp.397 - 403

The possibility of using granulated blast-furnace slag (GBFS), furnace bottom ash (FBA), and their combination as fine aggregates in concrete was studied by performing experiments. These materials were used without applying any preprocesses such as sieving and grinding. The compressive, flexural, and split tensile strengths of concretes with natural sand replaced with GBFS, FBA, and GBFS plus FBA at 10, 20, 30, 40, and 50% were examined at a fixed water-cement ratio (w/c). The percentages represent the replacement percentage of fine aggregate by GBFS, FBA, or their combination and were evaluated depending on weight basis. Also, micr . . .ostructure and water absorption capacity of concrete were researched. Test results showed that concrete strength decreases with increasing replacement ratio with respect to reference concrete. In addition, FBA decreases the strength of concrete more than GBFS. In particular, the strength of concrete was detrimentally affected when the replacement ratio was beyond 40%. The micro structure studies showed that different pore structures were formed in the concrete depending on the replacement material, that is, GBFS or FBA. It is concluded that the main reason for the strength reduction in new concrete is the formation of a porous concrete structure. Moreover, an increase trend in water absorption capacity was observed for both replacement materials. Copyright © 2007, American Concrete Institute. All rights reserved Daha fazlası Daha az

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