Effect of Internal Reinforcement on the Tensile Characteristics of the UHP SHCC Material

Abstract

Ultra-High-Performance Strain-Hardening Cementitious Composites (UHP-SHCC) is one form of fiber reinforced composites, which has high compressive and tensile strengths along with high strain capacity in tension with strain hardening plateau. Obviously, proper selection of strengthening/retrofitting material plays an important role in restoring the lost capacity of the strengthened/retrofitted member. This paper investigated experimentally the effect of internal reinforcement in the UHP-SHCC specimens on the tensile strength as well as the cracking characteristics. Seven UHP-SHCC specimens with identical dimensions of 500 x 150 x 50 mm were tested under pure axial tension. Different configurations of the internal reinforcement were considered; namely, internal orthogonal mesh of clear spacing of 50 mm in both directions, or smooth bars of 6 mm diameter. For both configurations, different reinforcement ratios were considered. The experiential results showed that the internal mesh configuration enabled the specimen to develop better crack distribution along with higher tensile capacity compared to those of specimens having internal smooth bars configurations. In addition, increasing the internal reinforcement ratio resulted in increase the tensile strength of the UHP-SHCC as well as reduce the average crack spacing.

Efficient Steel Reinforced Uhp SHCC Strengthening for Lap Spliced Rc Beams

“…Nowadays, Ultra High Performance Strain Hardening Cementitious Composites (UHP-SHCC) have been used for strengthening or repair concrete members. This material is a new generation of fiber reinforced cementitious composites, which has many advantages on large strain capacity as well as high compressive and tensile strains [22][23][24][25][26]. UHP-SHCC is a composite material comprising a cement-based matrix and short polypropylene fibers with outstanding mechanical performance [27][28][29].…”

Efficient Steel-Reinforced Uhp-SHCC Strengthening for Lap-Spliced Rc Beams

“…Nowadays, Ultra-High-Performance Strain-Hardening Cementitious Composites (UHP-SHCC) have been used for strengthening or repair concrete members. This material is a new generation of fiber reinforced cementitious composites, which has many advantages on large strain capacity as well as high compressive and tensile strength [22][23][24][25][26]. UHP-SHCC is a composite material comprising a cement-based matrix and short polypropylene fibers with outstanding mechanical performance [27][28][29].…”