With the large-scale construction of infrastructure such as high-speed railways and the rapid development of building industrialization and prefabricated buildings, the precast concrete industry has ushered in vigorous vitality. However, there are many tricky problems such as high-energy consumption and unstable long-term performance in the existing production technology of steam-cured concrete. Based on the current research on concrete early strength technology, this paper focuses on the early strength performance and greenness evaluation of the reference cement–sulfoaluminate cement (C–SAC) system. The results confirm that when the 30% mineral admixture—60% C–10% SAC system is mixed with the composite early strength agent, the 1 day strength of mortar can reach 38.0 MPa under the condition of 45°C steam curing. The water absorption is 1.1% after 28 days. The carbon emission of the system (32.1%) is lower than that of the reference cement, and the production energy consumption and the initial resource energy are reduced by 14.4% and 8.2%, respectively. This paper provides a promising strategy for the development of low-carbon, and early strength concrete and ultimately provides technical support for the realization of high-quality and green production of precast concrete components.

In order to improve the damage resistance of concrete, a cement-based self-healing additive (abbreviate as CS) was prepared. To investigate the influence of CS on the self-healing performance of cementitious material, X-ray diffraction (XRD) and thermal analysis were used to investigate the effects of different dosages of CS on the hydration process and hydration products of cementitious material. Compressive strength test and load damage self-healing test were used to show the influence of different amounts of CS on the mechanical properties of concrete. The pore structure distribution of cement paste with different dosages of CS was analyzed using mercury intrusion testing method. The results indicated that different dosages of CS had no effect on the types of hydration products of cementitious material. Adding an appropriate amount of CS can effectively improve the micro pore structure of cement-based materials, reduce the proportion of harmful pores in the structure, and decrease the most probable pore diameter. When microcracks are generated in the structure under load, CS can promote the formation of hydration products inside the structure to fill the microcracks, thereby improving the self-healing performance of cement-based materials. This study provides an idea for improving microcracks and enhancing durability of marine concrete structures.