冻融循环下导电混凝土压阻效应的稳定性研究

以碳纤维、石墨为导电相材料, 掺入粉煤灰和硅灰制备导电混凝土, 研究了粉煤灰、硅灰的掺量对导电混凝土抗冻融性能的影响, 定义了压阻效应稳定性的指标, 探究了压阻效应稳定性随冻融循环的变化规律, 建立了导电混凝土在冻融循环下的电阻率演化模型和压阻效应稳定性模型. 研究结果表明: 在导电混凝土中加入粉煤灰、硅灰可有效提高其抗冻融能力; 当粉煤灰、硅灰总掺量相同时, 较高掺量的粉煤灰可以提升导电混凝土压阻效应的稳定性.

Stability study of piezoresistive effect of conductive concrete under freeze-thaw cycles

Conductive concrete is prepared by using carbon fiber and graphite as conductive phase materials and adding fly ash and silica fume, with which the effects of fly ash and silica fume content on the freeze-thaw resistance of conductive concrete are studied. The index of piezoresistive effect stability is defined, and the variation law of piezoresistive effect stability with freeze-thaw cycles is explored. The resistivity evolution model and piezoresistive effect stability model of conductive concrete under freeze-thaw cycles are established. The research results show that the addition of fly ash and silica fume to conductive concrete can effectively improve its freeze-thaw resistance, and when the total content of fly ash and silica fume is the same, a higher content of fly ash can improve the stability of the resistance effect on the pressure of conductive concrete.