Mechanical Properties of Hybrid Ultra-High Performance Engineered Cementitous Composites Incorporating Steel and Polyethylene Fibers

Abstract

This paper presents the authors’ newly developed hybrid ultra-high performance (HUHP) engineered cementitious composite (ECC) with steel (ST) and polyethylene (PE) fibers. From this point on it will be referred to as HUHP-ECC. The volumes of steel and PE fibers were adjusted to obtain different mechanical properties, including compressive strength, tensile, and flexural properties. We found that tensile and flexural properties, including bending strength and ductility indexes, increased with higher PE fiber amounts but reduced with the increased ST fiber volume. Notably, the compressive strength had the opposite tendency and decreased with increases in the PE volume. The ST fiber had a significantly positive effect on the compressive strength. The fluidity of HUHP-ECC improved with the increasing amount of ST fiber. The pseudo strain-hardening (PSH) values for all the HUHP-ECC mixtures were used to create an index indicating the ability of strain capacity; thus, the PSH values were calculated to explain the ductility of HUHP-ECC with different fiber volumes. Finally, the morphology of PE and ST fibers at the fracture surface was observed by an environmental scanning electron microscope (ESEM).

Dynamic compressive behavior of a novel ultra-lightweight cement composite incorporated with rubber powder

“…Figure 8 shows the direct tensile stress-strain curves of the RULCC coupon specimens. It is found that the tensile strain capacity of R0-0.7PE with low fiber content of 0.7% can reach 3%-4%, which is much higher than that of normal concrete, and meets the tensile strain requirements of the Engineered Cement Composite (ECC) materials [41]. The tensile strain capacity of R10-0.7PE with 10% rubber powder can reach about 4%-5%, showing promising ductile performance.…”

Influences of Sodium Lignosulfonate and High-Volume Fly Ash on Setting Time and Hardened State Properties of Engineered Cementitious Composites

“…They have attracted the increasing attention of researchers and engineers to a wide range of innovative applications in structural engineering due to their advantageous mechanical properties and durability [1][2][3][4][5][6][7][8][9][10][11]. Engineered Cementitious Composites (ECC), a unique class of HPFRCCs, feature a large strain capacity with selfcontrolled crack width [12][13][14][15][16][17][18][19][20][21][22][23]. Its tensile strain capacity can reach more than 3% [17][18][19][20][21][22][23][24][25][26], and its average crack width was reported to be less than 60 µm when the tensile strain demand was less than 1% [14].…”

Research on compressive strength of hybrid fiber reinforced concrete based on orthogonal design

“…For example, the addition of steel fiber can improve the tensile strength, impact resistance and toughness of concrete, but steel fiber has the disadvantages of easy corrosion, high bulk density, poor performance and so on. Polypropylene fiber can improve the tensile capacity and deformation capacity of concrete, but the elastic modulus and compressive capacity of concrete usually decrease slightly [4]. Mixing two or more kinds of fibers into concrete to make hybrid fiber concrete can effectively solve the above problems, and has better economic benefits [5].…”