Kim Min Kyoung, Kim Dong Joo
Department of Civil and Environmental Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea.
Materials (Basel). 2018 Jun 29;11(7):1115. doi: 10.3390/ma11071115.
The self-damage sensing capacity of high-performance fiber-reinforced cementitious composites (HPFRCCs) that blended long- (1 vol %) and medium-length (1 vol %) smooth steel fibers was considerably improved by adding milled glass fibers (MGFs) with a low electrical conductivity to a mortar matrix. The addition of MGFs (5 wt %) significantly increased the electrical resistivity of the mortar matrix from 45.9 to 110.3 kΩ·cm (140%) and consequently improved the self-damage sensing capacity (i.e., the reduction in the electrical resistivity during the tensile strain-hardening response) from 17.27 to 25.56 kΩ·cm (48%). Furthermore, the addition of MGFs improved the equivalent bond strength of the steel fibers on the basis of the higher pullout energy owing to the accumulated cementitious material particles attached to the surfaces of steel fibers.
通过向砂浆基体中添加低电导率的磨碎玻璃纤维（MGFs），混合了长（1体积%）和中长（1体积%）光滑钢纤维的高性能纤维增强水泥基复合材料（HPFRCCs）的自损伤传感能力得到了显著提高。添加MGFs（5重量%）显著提高了砂浆基体的电阻率，从45.9千欧·厘米提高到110.3千欧·厘米（提高了140%），从而将自损伤传感能力（即拉伸应变硬化响应过程中电阻率的降低）从17.27千欧·厘米提高到25.56千欧·厘米（提高了48%）。此外，由于附着在钢纤维表面的胶凝材料颗粒的积累，基于更高的拔出能量，MGFs的添加提高了钢纤维的等效粘结强度。
