Entering winter, the temperature in Jinan continues to drop, and many decoration construction teams and homeowners will have doubts when carrying out plastering construction: does the water evaporate slowly when it gets cold, and does the plastering mortar still need to be watered for maintenance? Many people even think that 'low temperature can slow down drying, and it's okay without maintenance'. In fact, this idea has obvious misconceptions. Based on the local climate characteristics of Jinan and the principles of mortar construction, even in cold weather, watering and curing the plastering mortar is essential. Today, we will provide a detailed science popularization specifically for this issue.
To understand why maintenance is necessary even in cold weather, one must first understand the core role of maintenance. Many people mistakenly believe that maintenance is just to prevent mortar from drying out too quickly, but in fact, it is a key link in ensuring the quality of the wall. Specifically, there are three core reasons, each of which is closely related to the construction scene in Jinan.
Firstly, ensure that the mortar strength meets the standard. The formation of mortar strength depends on the hydration reaction of cement, which requires sufficient moisture and suitable environment. Although the drying speed in winter in Jinan is slower than in summer, the low temperature itself will slow down the process of hydration reaction. If watering and maintenance are not carried out, the water in the mortar will slowly evaporate, and the hydration reaction will be forced to stop before it is fully carried out. The strength of the resulting wall will be greatly reduced, and problems such as sanding and peeling may occur in the later stage. Especially in winter in Jinan, it is windy, and even if the temperature is low, the wind will accelerate the loss of surface moisture, further affecting the reaction effect. Therefore, watering and curing can provide continuous moisture support for the hydration reaction and steadily improve the strength of the mortar.
Secondly, avoid the anti alkali effect on the appearance of the wall. The plastering mortar contains a certain amount of alkaline substances, which is a characteristic of the material itself. If not watered and maintained, these alkaline substances will slowly penetrate into the surface of the wall as water evaporates, forming a white alkali frost, commonly known as "anti alkali". In winter in Jinan, there is a large temperature difference between indoor and outdoor areas, which makes it easy for condensation water to occur on the walls, exacerbating the anti alkali phenomenon. This not only affects the appearance of the walls, but may also affect the construction effect of subsequent coatings and wallpapers. Watering and maintenance can remove some alkaline substances from the surface layer through water flushing, reducing the occurrence of anti alkali problems from the source.
Thirdly, ensure the flatness of the wall surface to assist in subsequent construction. After applying and polishing the mortar, it is inevitable that some fibers and dust will remain on the surface, which will make the wall rough. If not cleaned thoroughly, it will be difficult for the primer to penetrate evenly during subsequent spraying, which may lead to peeling and detachment. Construction is carried out in cold weather, and the drying speed of mortar is slow, which provides ample time for watering and cleaning. By watering and rinsing, surface impurities can be thoroughly removed to make the wall smoother, and the wall can be kept moderately moist, laying a good foundation for subsequent processes.
Here we would like to remind everyone that there are also precautions for watering and maintenance in Jinan during winter. It is recommended to choose the time when the temperature is higher at noon to avoid water freezing on the wall and damaging the mortar layer. The maintenance frequency does not need to be too high, just keep the wall moist, usually lasting for 3-5 days.
In short, regardless of the temperature, watering and curing the plastering mortar is an indispensable step. Especially under the special winter climate conditions in Jinan, proper maintenance work is necessary to ensure the strength, aesthetics, and durability of the walls. I hope this science popularization can help everyone correct their cognitive misconceptions and avoid detours in decoration construction.
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