直接电养护对混凝土性能的影响

Effect of Direct Electric Curing on Properties of Concrete

以石墨和碳纤维为导电相材料,研究了石墨掺量(2%、4%)和养护方式(标准养护、直接电养护)对混凝土抗压强度和微观结构的影响,分析了直接电养护时间与试件内部温度和电阻率之间的关系。结果表明:掺入适量导电相材料可以改善混凝土的力学性能,提高混凝土的导电性能;直接电养护可以提高混凝土的内部温度,促进水化反应进程,提高混凝土的抗压强度,且对早期抗压强度的提高效果更大;随着直接电养护时间的增加,混凝土的电阻率不断增大,导电性能降低;直接电养护可以有效减小混凝土中凝胶孔的孔径,改善混凝土的孔结构。

Using graphite and carbon fiber as conductive phase materials,the effects of graphite content(2%,4%)and curing methods(standard curing,direct electric curing)on the compressive strength and microstructure of concrete were studied,and the relationship between the direct electric curing time and the internal temperature and resistivity of the specimen was analyzed.The results show that the mechanical properties and electrical conductivity of concrete can be improved by adding proper content of conductive phase materials.Direct electric curing can increase the internal temperature of concrete,thus promoting the hydration reaction process,improving the compressive strength of concrete,and has a greater improvement effect on the early compressive strength.With the increase of direct electric curing time,the resistivity of concrete increases continuously and the electrical conductivity decreases.Direct electric curing can effectively reduce the pore size of gel pores in concrete and improve the pore structure of concrete.