Effect of the structure of asphaltic polymer-impregnated concrete on its frost resistance and water impermeability

Conclusions

• 1. For a porosity of about 5% the quality indices of APC are at the level of the requirements of the existing specifications P20-85:K _F≥0.85,R ₂₀>3 MPa,R ₅₀>1.2 MPa,K _th>2.5–3.

• 2. The experiments on the impermeability of APC showed that material with a porosity of 4–5% withstands a water pressure of 0.2–0.3 MPa without its infiltration through the specimens.

• 3. The results obtained give grounds to revise the traditional requirements imposed on the residual porosity — not more than 3% — of APC-base structural members. Compaction of asphaltic and asphaltic polymer-impregnated concrete mixes to a residual porosity of 4–5% will make it possible to reduce expenditures on compaction. In this case, variants of compacting mixes to various residual porosities are possible in combination with surface treatment of the material with sealing compositions (for example, with a bitumen-polymer binder) which must be substantiated by technical and economic calculations for the particular conditions of conducting works on constructing watertight facings of hydraulic structures.