1. Construction preparation stage
Preparation work before construction is crucial. First of all, material preparation is required. It is necessary to ensure that the quality of Quick Repair Mortar is qualified and within the shelf life. At the same time, sufficient materials should be prepared according to the repair area and estimated usage. Check the base material. Different bases (such as concrete, masonry, metal, etc.) have different processing requirements. For the concrete base, the surface dust, oil, loose particles and old coatings should be thoroughly removed. If there are holes or cracks, appropriate expansion or cleaning of the inside of the holes should be carried out to ensure that the surface of the base is solid, flat and clean. Then the base is moderately moistened and sprayed evenly with clean water, but avoid water accumulation, which helps to improve the adhesion between the repair mortar and the base. In addition, prepare the tools required for construction, such as a stirrer (it is recommended to use a mechanical stirrer to ensure uniform mixing), a spatula, a scraper, etc., and ensure that the tools are clean and free of debris.
2. Key points of the mixing process
Mixing is a key link in the construction process of Quick Repair Mortar. Accurately weigh water and dry powder of repair mortar according to the water-cement ratio specified in the product manual. First, pour the dry powder of the repair mortar into a clean mixing container, and then slowly add the measured water. Use low-speed stirring during stirring to avoid high-speed stirring to produce too many bubbles that affect the performance of the mortar. The stirring time generally lasts for 3-5 minutes to ensure that the dry powder and water are fully mixed and evenly formed to form a mortar with uniform texture without dry powder lumps. If the stirring is uneven, it may cause problems such as uneven strength and poor adhesion of the repair mortar during use. During the mixing process, if the mortar is found to be too dry or too thin, water or dry powder should not be added at will, and the adjustment method in the instructions should be strictly followed.
3. Construction operation specifications
When applying the repair mortar, for small-area repairs, such as small cracks or local potholes, use a spatula to take an appropriate amount of mortar and apply it directly to the base. Compact the mortar and spread it evenly so that the mortar fits tightly to the base. If it is a vertical or upside-down construction, in order to prevent the mortar from slipping before hardening, the thickness of each application should not exceed 2-3 cm, and it can be applied in multiple times. For large-area repairs, first use a scraper to evenly spread the mortar on the base, and then use a spatula to level it. The construction thickness depends on the actual situation, but it should not exceed 5 cm. If the thickness is large, it needs to be constructed in layers, and the thickness of each layer is controlled at about 2-3 cm. The next layer should be applied only after the previous layer of mortar reaches a certain strength (such as no obvious marks when pressed by fingers). During the construction process, attention should be paid to maintaining the flatness of the repair surface to ensure that the repaired surface is flush with the surrounding base surface or meets the design requirements.
4. Maintenance measures and precautions
Maintenance after the repair is completed plays an important role in the performance of Quick Repair Mortar. In the early stage of hardening of the repair mortar, the construction environment temperature should be controlled within an appropriate range, generally 5-35°C. If the temperature is too high, the water in the mortar evaporates too quickly, which may lead to incomplete strength development; if the temperature is too low, the mortar may prolong the setting time or even be damaged by freezing. In a dry environment, moisturizing maintenance should be carried out, and plastic film, wet sacks, etc. can be used to prevent the water in the mortar from being lost too quickly. The curing time is determined according to the product manual and the actual project conditions, usually not less than 3-7 days. During the curing period, avoid external impact or premature load on the repaired part to ensure that the repair mortar can be fully hydrated to achieve the expected strength and durability.