Abstract
To explore the influence of fly ash (FA) and silica fume (SF) on the mechanical properties of self-compacting concrete (SCC) under uniaxial and triaxial, the compressive strength test, splitting strength test, ultrasonic testing test, and triaxial test were performed in this paper. The results show that the 3 days compressive strength and splitting strength of SCC decreased with the increase of FA substitution rate. The 28 days, 56 days, and 91 days compressive strength and splitting strength of SCC increased first and then decreased with the increase of FA substitution rate. The peak stress and peak strain of SCC gradually increased with the increase of confining pressure. The peak stress and strain of SCC increased first and then decreased with the increase of FA substitution rate. Moreover, the relationship models between compressive strength and splitting strength, between compressive strength and amplitude, between peak stress, peak strain and confining pressure under different FA substitution rates were proposed. As a conclusion, the addition of SF can increase the strength of SCC obviously. Under uniaxial stress, SCC failure mode is splitting failure, under triaxial stress, SCC failure mode is shear failure. Based on the Mohr-Coulomb strength theory, the failure criterion of SCC with FA and SF was discussed.
Highlights
Self-compacting concrete (SCC), known as self-leveling concrete, is a kind of concrete which can fill all parts of concrete formwork and steel bar gap compactly and uniformly without vibration or slightly vibration under the action of its own gravity [1]
Zhang et al [22] carried out biaxial experimental study on SCC with fly ash (FA), the results show that compared with ordinary concrete under biaxial loading, the principal stress of SCC was affected by lateral compressive stress, and the strength criterion equation of SCC under biaxial loading was put forward
Sun et al [23] carried out an experimental study on the composite mechanical properties of self-compacting lightweight aggregate concrete, the results show that under the combined action of compression and shear, the shear failure load, residual load and shear failure displacement of SCC increase gradually with the increase of axial compression ratio, and the unified failure criterion equation of concrete compression-shear composite action was put forward
Summary
Self-compacting concrete (SCC), known as self-leveling concrete, is a kind of concrete which can fill all parts of concrete formwork and steel bar gap compactly and uniformly without vibration or slightly vibration under the action of its own gravity [1]. The deviation of steel bar, formwork and reserved embedded parts caused by vibration can be avoided in the process of construction and pouring. It can reduce noise pollution, reduce labor cost, and improve engineering efficiency. With the development of construction machinery and technology, it was widely used in construction, bridge, tunnel, hydraulic engineering, and other fields [2,3,4,5,6,7]. Esfandiari et al [8] studied the effect of perlite powder and silica fume (SF)
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