Cement-stabilized soil is widely-used to improve mechanical properties of soils in cold regions. For the safety operation and maintenance of geotechnical engineering, it is important to clarify the main control factors of shear strength and the change mechanism of shear characteristics for cement-stabilized soil cured at negative temperatures. In this paper, the shear characteristics of cement-stabilized silty clay were tested under different curing temperatures, cement content, initial water content, and curing age. The influencing factors and variation rules of the shear strength for cement-stabilized silty clay under negative curing temperature were analyzed. The test results show that the shear strength of cement-stabilized soil under negative curing temperature is less than that under positive curing temperature. The pore characteristics of cement-stabilized soil are significantly different under different curing temperatures, which makes the shear failure morphology of cement-stabilized soil shows different degrees of brittleness effect. Besides, initial cement content and initial water content significantly affect the shear strength of cement-stabilized soils, and its shear strength increases with the cement content raised, the optimal initial water content of 16% ~ 20% is the most favorable for the strength growth with cement-stabilized soil. Additionally, the cohesion of cement-stabilized soil increases with the cement content, and firstly increases and then decreases with the initial water content. With the increase of cement content and initial water content, the internal friction angle also firstly increases and then decreases.

Snow and ice on roads, bridges and reservoir dam panels in cold regions seriously affect the performance of the project, and have a significant impact on the safe operation and maintenance of the project. The extensive use of de-icing materials, e. g., de-icing salt and snow melting agents, lead to serious environmental pollution. Conductive concrete, as an environmentally friendly and efficient snow/ice melting technology, plays an important role in ensuring the safe operation and maintenance of engineering, extending the service life of the project, and improving the service quality of engineering. At the same time, the use of conductive concrete as building materials in cold areas has indoor heating function, which can alleviate the energy shortage to some extent. This paper reviews the preparation process of commonly-used conductive concrete, analyses the mechanical-electrical-thermal properties of some kinds of conductive concrete, e. g., carbonaceous conductive concrete, metallic conductive concrete and complex-phase conductive concrete, and then researches the influence of conductive materials on the mechanical performance of conductive concrete (e.g., conductivity, frost resistance, and durability). Based on the above analysis, the research concepts of conductive concrete in cold regions are proposed considering the goals of high performance and low cost: 1) Recycling materials, such as recycled carbon fiber, should be widely used to develop multiphase conductive concrete; 2) Magnetic separation fly ash, slag, and silica fume are extensively used as admixtures in conductive concrete; 3) Investigating the heating and conductivity performances of conductive concrete under the low charging voltage; 4) Utilizing comprehensive clean energy (e.g., solar energy, wind energy, etc.) to generate electricity for conductive concrete; 5) Exploring the conductive concrete-geotechnical-environment feedback mechanism under complicated engineering environment.