Effect of Paraformaldehyde Fibers on Mechanical and Shrinkage Properties of High-Strength Concrete

The influence of polyformaldehyde fibers on the mechanical and shrinkage performance of concrete was studied. The research was conducted to investigate the early performance of paraformaldehyde fiber concrete using the concrete mechanical properties test method and early shrinkage test apparatus under different test conditions of fiber length, fiber admixture, and curing conditions. The results demonstrated that the improvement of compressive strength of high-strength concrete by paraformaldehyde fibers was not significant, and the compressive strength was still slightly reduced compared to that of the baseline concrete. The compressive strength of concrete was affected by different curing conditions. The improvement of shrinkage properties of high-strength concrete by paraformaldehyde fiber is more significant. Curing conditions have a greater effect on the shrinkage properties of paraformaldehyde fiber concrete, and the better the curing conditions, the more adequate the hydration reaction of concrete. Meanwhile, this study proposes shrinkage and anti-cracking control measures for high-strength concrete such as preferential selection of raw materials, optimization of matching ratio, reasonable configuration of reinforcement, and strengthening of maintenance.