Experimental study on complete stress-strain characteristics of two kinds of green concretes

Hoang Anh Nguyen, Ta Peng Chang, Yu Hao Kuo and Jeng Ywan Shih

Abstract

The current study explores the empirical whole stress-strain curves detected from the axial compression test of the green concretes manufactured with two kinds of no-cement binders. The first one is the binder of alkali-activated material (AAM) with ground granulated blast furnace slag blending with Class F fly ash (FFA) and the second is a new hydraulic SFC binder produced by mixing ternary powders of slag (S), FFA (F), and circulating fluidized bed combustion fly ash (C). The performances of two green concretes were conducted and compared with that of the plain ordinary Portland cement (OPC) concretes with the equivalent 28-day compressive strengths graded at 30, 40, and 50 MPa. Experimental results showed that the AAM concretes had the energy absorption capacity lower than those of the SFC and OPC concretes because the descending parts of the whole stress-strain curves of the AAM concretes referred to the snap back mode different from the strain softening modes of those of the SFC and OPC concretes with the compressive strength graded at 30 or 40 MPa. Among three concretes with equivalent strength grades, the AAM concretes had the lowest elastic Young

Key Words

CFBC fly ash; fly ash; no-cement; stress-strain curve; slag

Address

Hoang Anh Nguyen: Department of Rural Technology, College of Rural Development, Can Tho University, Can Tho City 90000, Vietnam Ta Peng Chang: Department of Civil and Construction Engineering, National Taiwan University of Science and Technology (NTUST) (Taiwan Tech), Taipei 106, Taiwan Yu Hao Kuo: Department of Civil and Construction Engineering, National Taiwan University of Science and Technology (NTUST) (Taiwan Tech), Taipei 106, Taiwan Jeng Ywan Shih: Department of Chemical Engineering, Ming Chi University of Technology, New Taipei City 243, Taiwan

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