The application of sulphoaluminate cement to the plugging material makes the setting time short, the hardening speed fast, and the long-term stability good. In general, the use of ordinary cement composite quick-setting agent or composite cement system to prepare plugging materials, although a short setting time has been achieved, but rapid hardening has not been achieved, that is, "fast setting but not early strength". It is difficult to meet the use requirements in the actual application process.
The plugging material made of sulfoaluminate cement can be adjusted arbitrarily within a dozen seconds to a few minutes, and hardens rapidly once set, truly realizing the purpose of "quick setting and fast hardening". Plugging products often have a long storage time (the general shelf life is 6 months), which greatly prolongs the coagulation time, thus seriously affecting its use effect. The plugging material mainly prepared with sulphoaluminate cement mainly relies on accelerating the hydration reaction between minerals to achieve quick-setting effect, which is completely different from the hydration and setting method of ordinary plugging materials, such as Portland cement plus more A quick-setting agent (referred to as Portland cement plugging material), and Portland cement mixed with special cement to add a variety of quick-setting agents (referred to as composite cement plugging material), sulphoaluminate cement plugging material will not produce additional The "adsorption" and "reaction" of the agent have good storage and long-term stability. Take the above three kinds of plugging material samples, adjust them to have the same setting time (initial setting 2 minutes, final setting 3 minutes), and carry out test comparisons. The order of early strength development speed from fast to slow is: sulphoaluminate cement plugging material > Portland cement plugging material > composite cement plugging material.
The application of sulphoaluminate cement in the external insulation mortar of the external wall: it can make the bonding mortar harden quickly after being pasted, increase the construction speed and shorten the construction period; improve the surface hardness and compactness of the plastering mortar; allow the material to be used normally at lower temperatures. Sulphoaluminate cement can achieve rapid curing under the premise of satisfying the sufficient working time of the bonding mortar.
Sulphoaluminate cement has excellent bonding strength with EPS/XPS boards, and it can reach the bonding strength that other bonding materials need 28 days to achieve in 1 day. This not only achieves rapid construction (the next step of plastering mortar construction can be carried out after 4 hours at room temperature), but also reduces the amount of polymer in the mortar and reduces material costs. The introduction of sulfoaluminate cement, combined with high molecular polymers and early strength agents, can make the plastering mortar use at a minimum temperature of -7°C (0°C for other common materials), and the mortar will not be frozen and has a good of cohesion.
