Title: Complete Stress-Strain Behavior of Ecological Ultra-High- Performance Cementitious Composite under Uniaxial Compression

Author(s): Zhiyong Liu, Weiwei Chen, Wenhua Zhang, Yunsheng Zhang, and Henglin Lv

Publication: Materials Journal

Volume: 114

Issue: 5

Appears on pages(s): 783-794

Keywords: ecological ultra-high-performance cementitious composite (ECO-UHPCC); model; stress-strain behavior; uniaxial compression

DOI: 10.14359/51689899

Date: 9/1/2017

Abstract:
An ecological ultra-high-performance cementitious composite (ECO-UHPCC) was investigated in this paper. The ECO-UHPCC has three characteristics: low cement content (400 to 520 kg/m3 [24.97 to 32.46 lb/ft3]), contains nature river sand and high strength coarse aggregate, and is cured in standard condition. The complete stress-strain behavior of ECO-UHPCC under uniaxial compression was systematically investigated. First, a series of ECO-UHPCC specimens containing different coarse aggregates and steel fibers were fabricated. Second, the uniaxial compressive tests were conducted by a high-stiffness, closed-loop, servocontrolled, material testing machine, and the complete stressstrain curves of ECO-UHPCC were obtained. Then, the results, including complete stress-strain behavior, compressive strength, elastic modulus, Poisson’s ratio, toughness, and fracture pattern of ECO-UHPCC were systematically analyzed. The test results show that ECO-UHPCC exhibits better compressive strength and stiffness than high-performance concrete. The compressive strength and elastic modulus of ECO-UHPCC with basalt coarse aggregate and 2% steel fiber were up to 128.4 MPa (18.62 ksi) and 46.2 GPa (6700.51 ksi), respectively. Finally, a new model was developed for predicting the complete stress-strain behavior of ECO-UHPCC under uniaxial compression. This model shows a good correlation with the experimental results.