Zhang Lei, Li Ruisen, Li Sheng, Wang Han, Fu Qiang
School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, China.
College of Civil Engineering & Architecture, Qingdao Agricultural University, Qingdao 266109, China.
Materials (Basel). 2025 Jul 8;18(14):3220. doi: 10.3390/ma18143220.
To address the challenges of concrete construction in polar regions, this study investigates the feasibility of fabricating cement-based materials under severely low temperatures using electric-induced heating curing methods. Cement mortars incorporating fly ash (FA-CM), ground granulated blast furnace slag (GGBS-CM), and metakaolin (MK-CM) were cured at environmental temperatures of -20 °C, -40 °C, and -60 °C. The optimal carbon fiber (CF) contents were determined using the initial electric resistivity to ensure a consistent electric-induced heating curing process. The thermal profiles during curing were monitored, and mechanical strength development was systematically evaluated. Hydration characteristics were elucidated through thermogravimetric analysis (TG), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR) to identify phase compositions and reaction products. Results demonstrate that electric-induced heating effectively mitigates the adverse effect caused by the ultra-low temperature constraints, with distinct differences in the strength performance and hydration kinetics among supplementary cementitious materials. MK-CM exhibited superior early strength development with strength increasing rates above 10% compared to the Ref. specimen, which was attributed to the accelerated pozzolanic reactions. Microstructural analyses further verified the macroscopic strength test results that showed that electric-induced heating curing can effectively promote the performance development even under severely cold environments with a higher hydration degree and refined micro-pore structure. This work proposes a viable strategy for polar construction applications.
为应对极地地区混凝土施工的挑战，本研究探讨了采用电诱导加热养护方法在极低温度下制备水泥基材料的可行性。掺入粉煤灰（FA-CM）、粒化高炉矿渣（GGBS-CM）和偏高岭土（MK-CM）的水泥砂浆在-20℃、-40℃和-60℃的环境温度下养护。利用初始电阻率确定最佳碳纤维（CF）含量，以确保电诱导加热养护过程的一致性。监测养护过程中的热曲线，并系统评估力学强度发展。通过热重分析（TG）、X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）阐明水化特性，以确定相组成和反应产物。结果表明，电诱导加热有效地减轻了超低温限制所造成的不利影响，补充胶凝材料之间的强度性能和水化动力学存在明显差异。与参考试件相比，MK-CM表现出优异的早期强度发展，强度增长率超过10%，这归因于火山灰反应的加速。微观结构分析进一步验证了宏观强度试验结果，即电诱导加热养护即使在严寒环境下也能有效促进性能发展，具有更高的水化程度和细化的微孔结构。这项工作为极地建筑应用提出了一种可行的策略。
