Abstract
Dynamic compressive and tensile properties of mortar under impact loading were investigated experimentally by using a split Hopkinson pressure bar (SHPB) apparatus with pulse shaping technique. Firstly, the basic principle, experimental limitations and some feasible improvements/modifications of SHPB technique used for dynamic tests on concrete-like materials were summarized briefly. And then the dynamic compressive strength, stress versus strain response, and failure modes of mortar were discussed and analyzed. Finally, a dynamic Brazilian disc test was conducted to obtain the splitting tensile property of mortar, and some typical experimental results were presented. Both compressive and splitting tensile results show that mortar is a strain-rate sensitive material. Either compressive or tensile strength enhances with the increase of strain rate, especially when the strain rate is greater than the transition strain rate, which is around 20 s-1 for the dynamic compression and 2.0 s-1 for the splitting tension, respectively. These findings are helpful to guide the design and application of concrete structures.
Highlights
Mortar is a common type of concrete-like materials, and one of the most practical applications is used for rehabilitation and repair of reinforced concrete structures
It is well known that the mechanical behavior of concrete-like materials under dynamic loadings is strikingly different from that subjected to quasi-static loading conditions (Hughes, 1978; Grote, 2001; Ross, 1989)
The dynamic compressive experiments of cement mortar samples were conducted at several different strain rates by using Split Hopkinson pressure bar with pulse-shaping technique
Summary
Mortar is a common type of concrete-like materials, and one of the most practical applications is used for rehabilitation and repair of reinforced concrete structures These structures may be subjected to various dynamic loadings such as high-velocity impact, penetration and explosion. Concrete-like materials are generally considered to be strain rate-sensitive Both the tensile and compressive strengths increase with strain-rate, especially when the strain-rate is greater than a transition strain-rate, which is around ~ s-1 for the uniaxial tension and s-1 for the uniaxial compression, respectively (Grote, 2001; Li, 2009; Ross, 1989; Wang, 2012). With the use of large diameter Hopkinson bar to investigate the dynamic properties of concrete-like materials, some key problems such as high-frequency oscillation and dispersion of stress wave, and non-uniform stress/strain and non-constant strain rate deformation in the specimen, may be met in the tests (Gary, 1998; Zhao, 1998). The dynamic compressive and tensile tests on mortar were conducted using a SHPB set-up with a pulse shaper, to assess and understand the dynamic response of mortar to impact loading
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