Abstract
Concrete in practical applications has to inevitably suffer various impact loads. Recent research indicates that the hybrid fiber reinforced concrete (FRC) has better dynamic mechanical properties compared to the mono FRC under impact loading. Based on macro-experimentation and micro-observation, the impact behavior of the hybrid basalt-macro synthetic polypropylene FRC (BSFRC) was investigated by using ∅74 mm SHPB, SEM, and EDS. The effects of fiber hybridization, strain rate, and w/c ratio were analyzed simultaneously. The results show that the dynamic mechanical properties of BSFRC are strain-rate sensitive. Both basalt and macro synthetic polypropylene fibers (BF, SF) have a strengthening and toughening effect on concrete. Their hybridization has a similar enhancement effect but the impact toughness of concrete is further improved and the best hybrid ratio is 0.05%(BF)–0.25%(SF). BSFRC with higher w/c ratio has a higher strain rate effect while the fiber hybridization effect is weakened. Besides, the proposed constitutive model can well describe the impact behavior of BSFRC. The hydration of cement in the interface transition zones is lower with more Calcium Silicate Hydrate and less than that in the common mortar. However, the addition of BF and SF contributes to the hydration of cement and improves the performance of concrete eventually.
Highlights
Concrete is a widely applied engineering material and measures to improve the performance of concrete are desperately needed
The results showed that the hybrid Fiber reinforced concrete (FRC) had higher workability and longflexural steel fibers
After the split Hopkinson pressure bar (SHPB) test, the selected specimens were inlaid with epoxy resin to make a flat surface for fixing
Summary
Concrete is a widely applied engineering material and measures to improve the performance of concrete are desperately needed. Yu et al [16] studied the impact resistance of ultra-high performance concrete reinforced with long and higher workability and the flexural and compressive strength were improved by. Is an advanced processing method for limitations exist when explaining the impact of fiber and strain rate upon the dynamic behavior observing surfaces and is widely microscopy applied for analyzing theadvanced microstructure characteristics of of concretesample material. It can be deduced that interfaces between mortar and fiber, mortar, both positive and negative effects on mechanical and durability-related properties of concrete It and can aggregates important factors affecting concrete failure. Research on microstructural be deducedare that interfaces between mortar and fiber, mortar, and aggregates arethe important factors characteristics of specimens is significant to on understand the failurecharacteristics mechanism ofofBSFRC under affecting concrete failure.
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