DEVELOPMENT OF CARBON NANOFIBER SELF-CONSOLIDATING CONCRETE
Concrete is a ubiquitous construction material used since ancient times. Cement, the binding component of concrete, develops microcracks during casting and loading which weaken the final concrete structure. Microcracks range in size from picometers to micrometers and eventually lead to abrupt failure if not detected and repaired. In order to restrict the growth of mieroeracks, carbon nanofibers (CNFs) were added to the concrete mix.CNFs have tensile strengths over 7.0 GPa (1015 ksi) and an average length of 20 μm. These characteristics enable the nanofibers to bridge microcracks and absorb the energy normally released during crack propagation. Additionally, if a continuous circuit of CNFs can be formed throughout the cement matrix, the high conductivity of CNFs makes non-destructive electrical monitoring of concrete structures possible. Due to large Van der Waals forces between CNFs, however, uniform dispersion of the carbon nanofibers throughout the cement matrix is difficult to achieve. In order to improve the dispersal of CNFs, Self-Consolidating Concrete (SCC) was used to increase flowability throughout the wet concrete. The surfactant sodium lauryl sulfate was used to chemically suspend CNFs in the hydrophilic cement matrix.Ideal mix proportions were characterized by a visual stability index. The electrical resistivity and compressive strength of cylinders were investigated.
Carbon Nano-Fiber Self-Consolidating Concrete Compressive Strength Electrical Resistivity Electrical Resistance Variation Health Monitoring
Di GAO Mariel S.STURM Y.L.MO
CE&A Dept.Central South University, China CEE Dept.University of Houston,USA CEE Dept.University of Houston, USA
国际会议
长沙
英文
126-134
2009-06-05（万方平台首次上网日期，不代表论文的发表时间）