Abstract
In this paper, five groups of C40 fly ash and silica fume self-compacting concrete (SCC) mix proportion tests and in-line multi-cavity steel tube bundle self-compacting concrete shear wall axial compression performance tests and numerical simulation are completed and presented. The influence of fly ash and silica fume additions on SCC mechanical properties and the filled in-line multi-cavity steel tube bundle shear wall mechanical properties are analyzed and studied. With an increase in the fly ash content from 10% to 40%, the compressive strength of self-compacting concrete increases firstly and then decreases. When the fly ash content is 30% and the silica fume content is 4%, the compressive strength of the 28 d age self-compacting concrete is the highest and the compressive strength formula of the wrapped curing SCC is proposed. The failure of steel tube bundle is multi-wave buckling failure. As the SCC is most obviously affected by the collar at the corner point of the steel tube bundle, its compressive strength is 110 MPa, and is 96 MPa higher than the concrete at the middle point of the web. The deformation resistance of SCC is obviously enhanced by the confinement effect.
Highlights
China is a large country that produces coal and iron, and has wastes of fly ash and silica fume discharged from coal-fired power plants and ferroalloy plants, respectively
The results show that the simple superposition method is more appropriate to calculate the bearing capacity of high-strength concrete-filled steel tube shear walls
The 28 strength compressive strengths at d, d and d are in the d of increased first, and decreased with the increasing of fly ash content
Summary
China is a large country that produces coal and iron, and has wastes of fly ash and silica fume discharged from coal-fired power plants and ferroalloy plants, respectively. The total amount of fly ash is increasing year by year and the annual output is expected to reach 400 million tons by 2020 [1,2]. Fly ash and silica fume were once considered as industrial by-products that lead to environmental pollution, and cause secondary pollution such as land occupation. Reactive powder concrete has evolved into a comparatively mature phase and has become popular in various areas such as municipal works, buildings, roads and bridges [4,5,6,7,8,9,10].
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