As landfill space for the disposal of products of municipal solid waste incineration (MSWI) such as fly ash and slag becomes increasingly scarce, a reduction of disposed material is urgently required. The method of using incineration products in concrete production is explored in this paper through a feasibility study of utilizing fly ash and slag to replace cement and coarse aggregate in appropriate proportions. Results show that C30 concrete optimum replacement rates of fly ash and slag are 30% and 20%, which can meet the minimum strength requirement. The leaching concentrations of Cu, Zn, Pb, Cr, and Cd in MSWI concrete samples are determined to be less than the identification value of solid waste leaching toxicity. Based on scanning electron microscopy (SEM) and X‐ray diffraction (XRD) analyses, MSWI fly ash has certain dispersion. The particle size of MSWI fly ash is determined to be close to that of the coal fly ash, and the surface morphology is irregular. The main components include SiO₂, CaCO₃, and Ca₂SiO₄, and they are similar to those present in the coal fly ash. The slag structure is loose as well as irregular, and its main component is SiO₂. The SiO₂ and Al₂O₃ in fly ash and slag participate in the hydration reaction of cement and can increase concrete strength. It is thus confirmed that fly ash and slag generated by waste incineration can be used to replace cement and coarse aggregate in appropriate proportions, and it is an effective method to solve the problem of scarcity of solid waste landfill space.

A new type of prefabricated foundation for onshore wind power was proposed in this paper. The stress and bearing mechanism of the new foundation was explored through theoretical calculation and finite element analysis. The results show that compared with the extended foundation in the same position, the amount of concrete in the new foundation is reduced by 30.00%, and the amount of rebars are reduced by 34.69%. The new prefabricated foundation has been inspected and calculated according to the specification. The calculation results indicate that the stress and initial reinforcement of the foundation meet the specification requirements. The bearing capacity, inclination rate, deformation, and stability of the foundation meet the requirements. Through finite element analysis, it is further confirmed that the structure meets the requirements of wind turbine operation, and the overall force meets the requirements of various indicators. The stress distribution of the foundation concrete and rebars is reasonable and uniform, and the load transfer is great. Also, the maximum stress of rebars and concrete does not exceed the specification limit, and the concrete remains intact without cracking or damage. The new foundation structural design and theoretical analysis were reasonable and accurate, and can be put into application in the future.

In the context of global climate change, the implementation of building energy conservation and carbon reduction, as well as the realization of zero-energy buildings, is a key measure to cope with climate change and resource depletion. A substation is an indispensable building in the process of urbanization construction. However, in existing cold areas, the heating form of substations generally adopts electric heating, which consumes a large amount of energy. This paper optimizes the existing HVAC form of substations through the rational utilization of surrounding environmental resources and puts forward reasonable building energy-saving and carbon-reduction methods. It demonstrates the feasibility of combining solar photovoltaic power generation systems, air source heat pumps, and natural ventilation to optimize energy savings and carbon reduction in the main control building of a substation in a cold area. The computational fluid dynamics (CFD) method is used to demonstrate the feasibility of natural ventilation during the summer and transition seasons. The data indicate that the installation of a solar photovoltaic power generation system results in an average annual power generation of 18.75 MWh. Additionally, using an air source heat pump can save 44.5% of electricity compared to electric heating. When both a solar photovoltaic power generation system and an air source heat pump are used to provide a building with cold and heat sources, the annual emissions of CO₂ can be reduced by 4.90 tons compared to a traditional electric heating system.