Textile sludge has complex components and certain toxicity, which is in urgent need of resource treatment. The effect of textile sludge replacing cement and aggregates on the properties of polypropylene fiber concrete has been investigated by testing the compressive strength, drying shrinkage, heavy metal leaching concentration, micro morphology, and nanomechanical properties. The results show that the utilization of 10% textile sludge replacing cement increases the later strengths of concrete and decreases the drying shrinkage due to its denser microstructure. With the further content increase of textile sludge replacing cement, the strengths of concrete are reduced and the drying shrinkage is increased. The utilization of textile sludge replacing aggregates increases the compressive strengths of concrete and the drying shrinkage at every age, and among them, the concrete with 15% textile sludge replacing aggregates shows the highest compressive strengths, and the drying shrinkage of concrete increases with the content increase of textile sludge replacing aggregates. The concrete with textile sludge is a good solidification with heavy metal ions. The utilization of 10% textile sludge replacing cement improves the microstructure of concrete and helps to produce more high-density calcium silicate hydrate and reduces the thickness of the interfacial transition zone.

Brittle fracture is a typical mechanical characteristic of high-strength self-compacting concrete, and the research on its toughening modification remains the highlight in the engineering field. To understand the effect of toughening materials (including polymer latex powders, rubber particles, and polyethylene fibers) on the mechanical behavior of C80 high-strength self-compacting concrete under static loading, the failure mode, mechanical strength, strain field, and crack opening displacement (COD) of prepared high-strength self-compacting concrete under compressive, splitting, and flexural loads were studied based on digital image technology (DIC). The corresponding mechanism is also discussed. The results show that the hybrid of polymer latex powders, rubber particles, and polyethylene fibers can increase the crack path and inhibit the development of macrocracks in concrete, thus turning the fracture behavior of concrete from brittle to ductile. The addition of toughening materials reduced the compressive and flexural strengths of high-strength self-compacting concrete, but it increased the splitting strength. DIC showed that the incorporation of toughening materials promoted the redistribution of strain and reduced the degree of strain concentration in high-strength self-compacting concrete. The evolution of COD in high-strength self-compacting concrete can be divided into two stages, including the linear growth stage and the plastic yield stage. The linear growth stage can be extended by incorporating toughening materials. The COD and energy absorption capacity of concrete were enhanced with the addition of toughening materials, and the best enhancement was observed with the hybrid of polymer latex powders, rubber particles, and polyethylene fibers. Overall, this research provides a reference for exploring effective technical measures to improve the toughness of high-strength self-compacting concrete.