EARLY AGE MECHANICAL PROPERTIES AND SHRINKAGE OF BLENDED CEMENT CONCRETE CONTAINING SLAG

Author(s): Tahsin Alper Yikici(1), Egemen Kesler (2), Yilmaz Akkaya (2)
Paper category: Proceedings
Book title: SynerCrete’18 International Conference on Interdisciplinary Approaches for Cement-based Materials and Structural Concrete
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 671-676
Total Pages: 6
Language : English

Abstract: Slag cement concrete is usually preferred for the design of mass concrete structures exposed to the marine environment, due to chloride binding capacity and low heat of hydration properties. However, the early age property development of slag cement concrete is comparatively slower than Portland cement concrete (PCC). Therefore, longer curing might be essential to prevent early age cracks. In general, early age cracking potential of concrete mixtures depend on the stresses induced by shrinkage strains caused by hydration of cement, drying, and thermal contraction. Depending on the development of rigidity and modulus of elasticity of the concrete, such strains cause stresses that result in cracking when they exceed the tensile strength capacity of concrete. Thus, early-age shrinkage, mechanical strength and elasticity modulus development of slag cement concrete are essential parameters in early age cracking risk calculations. This study investigates the adiabatic heat development of slag cement concrete and its relation to the development of compressive strength, tensile strength, modulus of elasticity, and early-age shrinkage. Concrete mixtures containing 380-440 kg/m3 CEMIIIB 32.5N were cast with water to cement ratio of 0.32-0.40. Additionally, the effect of aggregate size and aggregate type was investigated by using limestone aggregates, and sandstone. The microstructure of the cement paste, investigated by thin sections, provided valuable information to distinguish the relationship between adiabatic heat, early-age shrinkage, and mechanical properties. The distance between particles and differences in particle size distribution of binders and aggregates were essential parameters in understanding the differences in performance of the concrete mixtures.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00