Drop-Weight Test for RC Frame Made of Polypropylene Fiber-Reinforced Concrete

Abstract

Drop-weight tests and static loading tests of RC frames made of polypropylene fiber-reinforced concrete are conducted to observe shock resistance performance and residual ductility. Experimental variables are fiber content and mass of the drop weight. In the impact test, the maximum drifts of the specimens are proportional to the mass of the drop weight although several collisions occur due to rebounding and the maximum acceleration is not always increased as the mass increases. In a static loading test, the initial stiffness is improved and crack lengths in the hinge areas of the columns are reduced by mixing the polypropylene fibers.

Drop-Weight Impact Loading of Polypropylene Fiber Reinforced Concrete Wall after One-Year Drying Shrinkage

“…This mixture is presented in Fig. 2, which is the same as that used in the authors' previous study (Makita et al 2018). An early strength Portland cement is used, the intention being to exaggerate the drying shrinkage strain.…”

Increasing Impact Endurance of Fiber Concrete

“…This approach to the increase of concrete impact endurance was studied by R. Oyguc [1], M. Kristoffersen [2], A. Maazoun [3], Z.I. Syed [4], K. Makita [5], etc. However, such concretes ensure quite modest increase of impact endurance -up to 2-4 times, which is not sufficient for protective structures under the influence of destruction weapons creating high dynamic loads on enclosure facilities.…”

“…Yoo [8][9][10], N. Ranjbar [11][12]). Dispersed reinforcement provides for considerable increase of all physical-mechanical characteristics of concrete, such as static strength, crack resistance, shock resistance [5].…”