THE APPLICATION OF STEEL SLAG AGGREGATE FOR CONCRETE PAVEMENT: MECHANICAL PROPERTIES AND STABILITY

煉鋼爐石應用於剛性鋪面之力學性質與穩定性評估

Duy-Hai Vo ； Ngoc-Duy Do ； Chao-Lung Hwang(黃兆龍) ； Min-Chih Liao(廖敏志) ； Chien-Ming Lu(盧建名)

《中國土木水利工程學刊》 34卷8期 (2022/12) Pp. 739-748

https://doi.org/10.6652/JoCICHE.202212_34(8).0009

摘要

This study aims to evaluate the performance of steel slag aggregate concrete for concrete pavement. Three kinds of Ladle furnace slag (LFS) with different expansion ratios were used as fine aggregate, while two kinds of Rotary kiln slag (RKS) named as Acid (AC) and Alkaline (AK) steel slag were used as coarse aggregate to manufacture the concrete specimens. The mix-proportions were designed using the Densified mixture design algorithm (DMDA) method with various water-to-binder (w/b) ratios of 0.3, 0.4 and 0.5. Compressive strength, splitting tensile strength, ultrasonic pulse velocity (UPV), electrical surface resistivity (ESR), and length change performance under autoclave tests were conducted to evaluate the concrete samples' mechanical properties and dimension stability up to 56 days of curing ages. The findings illustrated that the w/b ratio significantly affected the engineering properties of concrete samples. The LFS-II, with an expansion range of 0.2% ~ 0.4%, presented better mechanical properties than other fine aggregate kinds. AK concrete showed a more excellent engineering property than AC concrete. The LFS-I exhibited good stabilization after autoclaved test, while the higher expansion fine aggregate was not stable under autoclaved analysis.

關鍵字

steel slag aggregate ； compressive strength ； DMDA ； expansion ； stability

並列摘要

本文為評估煉鋼爐石材料應用於混凝土鋪面之先期研究，共三種爐石做為粒料用以製作混凝土試體，包含使用不同膨脹率之精煉鋼爐石（LFS）作為細粒料，另外兩種則分別採用酸性旋轉窯爐石（AC）及鹼性旋轉窯爐石（AK）作為粗粒料。基於緻密配比設計方法（DMDA）來決定混凝土材料組成比例，其水膠比（w/b）分別為0.3、0.4和0.5。以抗壓強度、劈張強度、超音波速（UPV）、表面電阻（ESR），並以56天齡期之熱壓膨脹試驗來評估混凝土試體的力學性能。結果顯示水膠比顯著影響試體的工程性質，當添加膨脹率在0.2%～0.4%之精煉鋼爐石細粒料具備較佳的力學特性；而添加鹼性旋轉窯爐石則優於添加酸性旋轉窯爐石的混凝土試體；建議經熱壓膨脹後的精鍊鋼爐石方可展現較佳的體積穩定性。

並列關鍵字

煉鋼爐石 ； 抗壓強度 ； 緻密配比法 ； 膨脹性 ； 穩定性

參考文獻

Pellegrino, C. and Gaddo, V., “Mechanical and durability characteristics of concrete containing EAF slag as aggregate,” Cement and Concrete Composites, Vol. 31, No. 9, pp. 663-671 (2009).

Malhotra, V. M. and Carino, N. J., “Handbook on nondestructive testing of concrete,” CRC Press (2004).

Buenfeld, N., Newman, J. B., and Page, C. L., “The resistivity of mortars immersed in sea-water,” Cement and Concrete Research, Vol. 16, pp. 511-524 (1986).

Cheyrezy, M., Maret, V., and Frouin, L., “Microstructural analysis of RPC (Reactive Powder Concrete),” Cement and Concrete Research, Vol. 25, No. 7, pp. 1491-1500 (1995).

Chen, T., Gao, X., and Ren, M., “Effects of autoclave curing and fly ash on mechanical properties of ultra-high performance concrete,” Construction and Building Materials, Vol. 158, pp. 864-872 (2018).