Effect of Silica Fume in Concrete on Mechanical Properties and Dynamic Behaviors under Impact Loading

Abstract

The effect of silica fume (SF) in concrete on mechanical properties and dynamic behaviors was experimentally studied by split Hopkinson pressure bar (SHPB) device with pulse shaping technique. Three series of concrete with 0, 12%, and 16% SF as a cement replacement by weight were produced firstly. Then the experimental procedure for dynamic tests of concrete specimens with SF under a high loading rate was presented. Considering the mechanical performance and behaviors of the concrete mixtures, those tests were conducted under five different impact velocities. The experimental results clearly show concrete with different levels of SF is a strain-rate sensitive material. The tensile strength under impact loading of the tested specimens was generally improved with the increasing content of SF levels in concrete. Additionally, the tensile strength under impact loading of the concrete enhances with the increase of the strain rates. Finally, failure modes, dynamic tensile strength, dynamic increase factor (DIF), and critical strain are discussed and analyzed. These investigations are useful to improve the understanding of the effect of SF in concrete and guide the design of concrete structures.

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

“…Moreover, the dynamic tensile strength of samples rose with the silica fume (SF) amount, as well as with strain rate. In addition, the strain rate sensitivity of concrete augmented with SF appeared to have increased in comparison to concrete without SF (see Figure 4) [67]. Table 1.…”

“…The proportion of concrete constituents with different SF levels by weight [67]. Tensile performance was investigated in another study, in which 3 different series of concrete samples (see Table 1) with 0 wt.%, 12 wt.% and 16 wt.% SF as a cement substitute were produced and tested [67]. The results indicated that SF added to concrete yielded superior mechanical properties under dynamic tensile loading.…”

“…Table 1. The proportion of concrete constituents with different SF levels by weight [67]. SF additions to concrete improve several other physical and chemical properties besides the mechanical strength: lower adverse environmental impact, decreased permeability, increased corrosion protection for steel bars and improved resistance against the sulphate and chemicals attacks [68,69].…”

The Effect of Incorporating Silica Stone Waste on the Mechanical Properties of Sustainable Concretes

“…Therefore, the use of this waste material in cement is important in concrete production not only for economic reasons [ 3 ] but also for technical ones [ 4 ]. Some investigations have been carried out to investigate the application of silica stone as aggregate [ 5 , 6 ]. Furthermore, many investigations have been done to study the effect of silica on concrete [ 7 ], waste glass [ 8 , 9 ], and glass powder [ 10 , 11 ].…”

An Improved Lagrangian-Inverse Method for Evaluating the Dynamic Constitutive Parameters of Concrete

“…The SHPB and Kolsky bar technique are widely used to conduct the test of dynamic constitutive behaviors on concrete-like materials [18][19][20]. However, the validity of SHPB results highly depends on the assumptions of one-dimensional stress wave propagation and stress uniformity along the specimen length [14].…”