Incorporating superabsorbent polymer (SAP), which has the abilities of absorption and desorption in concrete can achieve the effect of internal curing. The influences of the volume, particle size and ways of entrained water of SAP on the workability, compressive strength, shrinkage, carbonation resistance and chloride penetration resistance of concrete were analyzed through the macroscopic and microscopic test. The results show that pre-absorbed SAP can increase the slump of the mixture, but SAP without water absorption and pre-absorbed SAP with the deduction of internal curing water from mixing water can reduce the slump. The improvement effects of SAP on compressive strength of concrete increase gradually with the increase of age. Especially from 28 days, the compressive strength of concrete increases obviously. At later age, the compressive strengths of SAP concrete under natural curing environment exceed the strength of reference concrete under natural curing environment and nearly reach the strengths of reference concrete under standard curing environment. SAP effectively reduces the shrinkage of concrete, improves the concrete’s abilities of carbonation resistance and chloride penetration resistance. The microscopic test results show that SAP can effectively improve the micro structure and make the pore structure refined. When SAP is added into concrete, the gel pores and small capillary pores are increased, the size of big capillary pores and air pores are reduced.

In this study, three prefabricated integral shear wall specimens with strength differences were constructed based on a real engineering project to investigate the impact of these strength disparities on the structural performance of shear walls. The results indicate that all three prefabricated integral shear wall specimens with strength differences between precast (PC) and cast-in-place (CIP) concrete exhibited bending-shear failure. Moreover, the experimental axial-bearing capacity of the specimens was higher than the calculated axial-bearing capacity obtained using the reduced concrete strength according to the shear wall calculation formula in the code. The ultimate displacement angles of all three specimens exceeded the limit elastic–plastic displacement angle specified for shear wall structures under large seismic motions in the code, and the ductility factors were greater than 3. Furthermore, this paper presents a calculation formula for the axial-bearing capacity of the plane section of prefabricated integral shear walls with strength differences and compares it with experimental results. This paper presents a calculation formula for the axial-bearing capacity of the plane section of prefabricated integral shear walls with strength variations, compares the calculated results with experimental values, and shows that the relative error between the calculated and experimental values is nearly within 10%, which provides a design basis and reference for engineers in calculating the axial-bearing capacity of such shear walls with strength variations.