MATERIALS FORMULATION AND SERVICEABILITY DESIGN FOR ULTRA-HIGH PERFORMANCE CONCRETE
Materials and mechanical design procedures for ultra-high performance cement composites (UHPC) members based on analytical models are addressed.A procedure for the design of blended components of UHPC is proposed using quaternary cementitious materials incorporating commonly available cement replacement (fly ash, slag, microsilica, metakaolin) and fine filler (limestone) materials.A packing algorithm is used to extract the number density, mean centroidal distance, and coordination number of the microstructure.Similarly, rheological studies on the pastes provide yield stress, plastic viscosity, and min-slump spread.The blending procedures are based on a packing and rheology optimization approach, which is flexible enough to allow users modify the constraints depending on the application.Mechanical characterization is conducted on the developed UHPC mixtures by means of compression, tension and bending tests.The multiple cracking and associated deflection hardening behavior is characterized using digital image correlation (DIC) method.Closed-form solutions of moment-curvature responses of UHPC are derived based on elastic-plastic compressive model and trilinear strain hardening tension stress strain responses.Tension stiffening behavior of UHPC due to fiber toughening and distributed cracking is then incorporated in the cross-sectional analysis.Load-deflection responses for beam members are obtained using moment-area, and direct integration approach.The proposed models provide insights in the design of UHPC to utilize the hardening properties after cracking.
Microstructure Particle packing Deflection hardening Analytical model Structural
Yiming Yao Aashay Arora Narayanan Neithalath Barzin Mobasher
School of Civil Engineering, Southeast University, China School of Sustainable Engineering and the Built Environment, Arizona State University, USA
国际会议
福州
英文
349-363
2018-11-07（万方平台首次上网日期，不代表论文的发表时间）