Dynamic compressive and splitting tensile tests on mortar using split Hopkinson pressure bar technique

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.

Strain Rate Dependent Behavior and Modeling for Compression Response of Hybrid Fiber Reinforced Concrete

“…Investigations on the modeling of rate dependent stress-strain behavior of HFRC and engineered cementitious composites are quite limited as compared to modeling of rate dependent behavior of plain concrete (Yang et al, 2015;Lu, 2014;Mohammed et al, 2015;Elsanadedy et al, 2011;AlSalloum et al, 2014AlSalloum et al, , 2015. Wang et al (2008) studied the rate dependent stress-strain behavior of SFRC and proposed a model for stress-strain curve based on Weibull function (Weibull, 1951).…”

Modeling and Design of SHPB to Characterize Brittle Materials under Compression for High Strain Rates

“…For this reason, in brittle materials such as concrete, strain rates are relatively reduced due to the length of the specimen. Moreover, as the material behavior [12][13][14] in compression is different in comparison with tensile one [12,15,16], different experimental setups are necessary. In this work, a technique based on dynamic compression is described that allowed the material behavior of brittle materials to be defined for a large range of strain rates varying from 1 to 1000 (s −1 ).…”

Experimental and numerical investigation on the dumbbell-shaped specimen of concrete-like materials under tension

“…The tensile strength could also be measured through indirect methods, such as splitting experiments. Yang et al(2014) investigated the dynamic tensile performance of mortar by splitting tests, and results showed rate sensitivity.…”