Research Article
Pore Structure and Influence of Recycled Aggregate Concrete on Drying Shrinkage
Table 3
Effect of different pores on the properties of hardened cement paste.
| Name | Diameter | Description | Role of water | Impact on performance |
|
Capillary pores | 10–0.05 μm | Large capillary pores (macropores) | Performance such as volume water | Permeability, diffusion | 50–10 nm | Medium capillary pores (large capillary pores) | Generating small surface tension | Permeability when no macropores exist, shrinkage when relative humidity is greater than 80% | 10–2.5 nm | Small, independent capillary pores (small capillary pores) | Generating large surface tension | Shrinkage when relative humidity is between 50% and 80% |
|
Gel pores | 2.5–0.5 nm | Micropores | Strong water absorption, no planum semilunatum | Shrinkage and performance in all relative humidity ranges | ≤0.5 nm | Mezzanine space | | |
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