Dynamic compressive response of high-performance fiber-reinforced cement composites

Composite effect of hybrid fibers with different types containing steel fibers of two different length-diameter ratio, and polymer (PE) fiber was experimentally investigated for high-performance fiber-reinforced cement composites (HPFRCCs). Both of cylindrical cement paste and mortar specimens reinforced with 1.5% vol. hybrid fiber were carried out using a Phi 75mm diameter split Hopkinson pressure bar ranged strain rates from 67 s(-1) to 219 s(-1). A dynamic relationship of compressive stress-strain were tested. Results shows that different fiber reinforcement and strain-rate have a great effect for dynamic behavior of HPFRCCs. The dynamic compressive strength and ultimate strain all generally increase with increasing strain rate. At the similar strain rates, HPFRCCs with larger amount of PE fiber had higher compressive strength. Addition of steel fiber has improved the deformation performance and energy absorption. HPFRCCs with a larger amount of long steel fibers have shown higher dynamic strength. (C) 2020 Elsevier Ltd. All rights reserved.