Mechanical and Rheological properties of self-consolidating concrete containing slag and Natural zeolite

Document Type : Research Article

Authors

1 Concrete Technology & Durability Research Center, Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran

2 Professor of Department of Civil and Environmental Engineering, Concrete technology and durability research center, Amirkabir University of Technology, Tehran, Iran

3 Department of Civil Engineering, The University of Tehran , Tehran, Iran

4 Concrete Technology & Durability Research Center, Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran

Abstract

Self-consolidating concrete (SCC) has been considered as a step towards progress in concrete technology in recent years. SCC mixtures can be used in different structures with heavy reinforcement such as bridges, walls and foundations, without bleeding and segregation. The utilization of new materials such as natural and by-product materials that could probably decrease the CO2 emission of cement factories, is the main goal of this study. In this study in order evaluate the results of fresh and hardened properties of self-consolidating concrete, Portland cement was replaced by (5%, 10% and 15%) natural zeolite and (20%, 30% and 40%) slag in the binary mixtures. The mixtures incorporating ternary cementitious blends (ZS20, ZS30 and ZS40) were made with 10% zeolite and (20%, 30% and 40%) Slag. These materials are acting both as the cementitious admixtures as well as the fine filler in self-consolidating concrete. Properties such as slump flow, J-ring, V-funnel and T50 were investigated for evaluating the fresh properties of SCC mixtures. Also mechanical test such as compressive strength of hardened concretes was carried out. Replacement of supplementary cementitious materials (SCMs) improved the compressive strength of mixtures especially at later ages. At 180 days, the highest compressive strength of mixtures containing zeolite, slag and ternary mixtures belonged to Z10, S30 and ZS30 with 58.5, 58 and 58.7 MPa respectively.

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