|
Title |
Tensile Performance of PE Fiber-Reinforced Highly Ductile Cementitious Composite including Coarse Aggregate
|
|
Authors |
이방연(Bang Yeon Lee) ; 강수태(Su-Tae Kang) |
|
DOI |
https://doi.org/10.11112/jksmi.2020.24.5.95 |
|
Keywords |
섬유보강; 변형률 경화; 골재 크기; 입도분포; 인장변형률 성능 Fiber Reinforced; Strain hardening; Aggregate size; Particle size distribution; Tensile strain capacity |
|
Abstract |
For the purpose of developing a PE fiber-reinforced highly ductile cementitious composite having high tensile strain capacity more than 2% under the condition of containing aggregates with large particle size, this study investigated the tensile behavior of composites according to the particle size and distribution of aggregates in the composite. Compared with the mixture containing silica sand of which particle size is less than 0.6 mm, mixtures containing river sand and/or gravel with the maximum particle size of 2.36mm, 4.75mm, 5.6mm, 6.7mm were considered in the experimental design. The particle size distributions of aggregates were adjusted for the optimized distribution curves obtained from modified A&A model by blending different sizes of aggregates. All the mixtures presented clear strain-hardening behavior in the direct tensile tests. The mixtures with the blended aggregates to meet the optimum curves of aggregate size distributions showed higher tensile strain capacity than the mixture with silica sand. It was also found that the tensile strain capacity was improved as the maximum size of aggregate increased which resulted in wider particle size distribution. The mixtures with the maximum size of 5.6mm and 6.7 mm presented very high tensile strain capacities of 4.83% and 5.89%, respectively. This study demonstrated that it was possible to use coarse aggregates in manufacturing highly ductile fiber-reinforced cementitous composite by adjusting the particle size distribution.
|