The development of cementitious composite axial tensile technique and its application to carbon fiber-reinforced cementitious composites
A novel approach for tensile testing of cementitious composites using the ASCERA hydraulic tensile tester is described. The test specimens are cylinderical bars. Steel pistons are adhesively bonded on either end of the specimens are inserted in a chamber. The pressure is increased until the specimen is pulled apart by the hydraulic pressure experted on the pistons. The advantage of this method are: large volume under load, self-alignment to minimize externally applied bending moments and determination of the rupture stress exactly at the fracture initiation point. The technique developed in this study that utilizes the hydraulic testing machine for cementitious materials is referred to as the cementitious composite axial tensile technique (CCATT). The Uniaxial tensile strength values obtained using CCATT are compared to strength values obtained using the traditional uniaxial tensile test. The effect of carbon fibers on the mechanical properties of cement past composites is studied. The addition of polyacrylonitrite-based (PAN) carbon fiber to a cementitous paste matrix results in a significant improvement in the tensile an flexural properties of the composites axial temperature (CCATT). Weibull statistics are used to determine the effect of carbon fiber on the tensile and flexural strength of cement paste matrix. Weibull statistics indicate that reliability in flexure was not enhanced by fiber addition and there was no correlation between the percent fiber loading and the reliability of the composite. However, the reliability of the CFRC composite in tension was greatly improved and there is a positive correlation between fiber loading and the Wiebull modules m. Microstructural behavior of the tensile CFRC composite specimens is studied. SEM-micrographs show that carbon fibers can be uniformity dispersed into individual filaments in the cement matrix with low fiber loading such as 1% volume.
- Research Organization:
- Worcester Polytechnic Institute, MA (United States)
- OSTI ID:
- 7236230
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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