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

Properties of mortars containing waste bottle glass and blast furnace slag [ATIK cam ve yüksek firin cürufu katkili harçlarin özelli·kleri·]

Özkan Ö.

Article | 2007 | Journal of the Faculty of Engineering and Architecture of Gazi University22 ( 1 ) , pp.87 - 94

In this study, the properties of mortars that contain waste bottle glass and blast furnace slag as binding materials were investigated. For this purpose, specimens that were mixed with glass of two different colors alone and also together with glass mortar specimens where some amount of mortars were substituted with blast furnace slag were produced. The compressive strength test of specimens exposed to NaCl2, Na2SO4, MgSo4 are investigated. Also, expansion calculations that were related to ASR were made. For compressive strength, on clear glass-blast furnace slag with substitution ratio of 10%, the highest results were obtained. In . . .all ratio substitutions higher result were obtained from the reference in the other resistance tests Daha fazlası Daha az

Effect of curing treatments on the material properties of hardened self-compacting concrete

Salhi M. | Ghrici M. | Li A. | Bilir T.

Article | 2017 | Advances in Concrete Construction5 ( 4 ) , pp.359 - 375

This paper presents a study of the properties and behavior of self-compacting concretes (SCC) in the hot climate. The effect of curing environment and the initial water curing period on the properties and behavior of SCC such as compressive strength, ultrasonic pulse velocity (UPV) and sorptivity of the SCC specimens were investigated. Three Water/Binder (W/B) ratios (0.32, 0.38 and 0.44) have been used to obtain three ranges of compressive strength. Five curing methods have been applied on the SCC by varying the duration and the conservation condition of SCC. The results obtained on the compressive strength show that the period of . . .initial water curing of seven days followed by maturation in the hot climate is better in comparison with the four other curing methods. The coefficient of sorptivity is influenced by W/B ratio and the curing methods. It is also shown that the sorptivity coefficient of SCC specimens is very sensitive to the curing condition. The SCC specimens cured in water present a low coefficient of sorptivity regardless of the ratio W/B. Furthermore, the results show that there is a good correlation between ultrasonic pulse velocity and the compressive strength. © 2017 Techno-Press, Ltd Daha fazlası Daha az

Modeling of compressive strength parallel to grain of heat treated scotch pine (Pinus sylvestris L.) wood by using artificial neural network

Yapıcı, Fatih | Esen, Raşit | Erkaymaz, Okan | Baş, Hasan

Article | 2015 | Drvna Industrija66 ( 4 ) , pp.347 - 352

In this study, the compressive strength of heat treated Scotch Pine was modeled using artificial neural network. The compressive strength (CS) value parallel to grain was determined after exposing the wood to heat treatment at temperature of 130, 145, 160, 175, 190 and 205ºC for 3, 6, 9, 12 hours. The experimental data was evaluated by usi ng multiple variance analysis. Secondly, the effect of heat treatment on the CS of samples was modeled by using artificial neural network (ANN). © 2015, Journal Drvna Industrija. All rights reserved.

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