Expansion agents
| Item | Specifications | |
| Stability of pulp | √ | |
| Ratio of bleeding rate,%≤ | 50 | |
| Condensation time difference,min≥ | The initial setting | -90 |
| The final setting | —— | |
| Ratio of compressive strength,%≥ | 3d | 100 |
| 7d | 110 | |
| 28d | 100 | |
| Penetration height ratio,%≤ | 30 | |
| 48h Water absorption ratio,%≤ | 65 | |
| Corrosion of reinforcing steel | × | |
| Restrained expansion rate% | In the water 7d≥ | 0.025 |
| In air 21d≥ | -0.020 | |
Firstly, the introduction of expansion agents effectively controls the density of concrete. The incorporation of bubbles reduces the density, allowing for lightweight structural design, particularly beneficial in scenarios where structural weight is a critical consideration, such as in large-span structures and lightweight architectural designs.
Secondly, the application of expansion agents significantly enhances the concrete’s resistance to temperature differentials. The presence of bubbles enables the concrete to better withstand thermal expansion and contraction, effectively minimizing cracks and damage caused by temperature variations, thereby improving the durability of the concrete.
Additionally, expansion agents contribute to the improvement of concrete’s resistance to permeability and corrosion. The formation of micro-pores through the distribution of bubbles slows down the penetration of water and harmful substances, thereby enhancing the overall performance of concrete.
