In recent years, the development of gypsum-based mortar has been very rapid. Due to the development of lightweight, lightweight gypsum mortars, the amount of traditional cement-based mortars used for building plastering has been significantly reduced. Compared with cement-based mortar, lightweight gypsum mortar has higher tensile bond strength, is not easy to crack and hollow, and is suitable for thin-wall plastering. Lightweight gypsum mortar has low bulk density and high coating rate. Lightweight gypsum mortar has small particles and is more suitable for mechanized construction. Lightweight gypsum mortar has excellent fire protection, thermal insulation and sound insulation properties. In addition, most of the lightweight gypsum mortar is fired from waste gypsum from the phosphating plant to produce semi-hydrated gypsum and mixed into the lightweight lime mortar in proportion, which not only saves resources but also solves the pollution problem. This is a circular economy development project that benefits the country and people. Especially as a cementing material for construction, using waste gypsum instead of cement can save cement consumption.
The lightweight gypsum mortar is now shipped in bags and mixed on site. Mixing lightweight gypsum mortars on site generates much higher dust than cement-based mortars. A cement-based mortar mixed on site can be fixed somewhere on the ground, mixed with water to create a usable mortar, and then transported to the work surface. This on-site mixing is simply the point of dust contamination below. Lightweight plaster mortar is different. Every building surface is a dust contamination point, and every sprayer is a dust source! Lightweight gypsum mortar is lightweight, its bulk density is twice that of cement mortar, and its dust is much larger than cement mortar. In pneumatic conveying isolation tests, cement-based mortars blew off less dust than cement, while gypsum-based mortars blew off much higher dust than cement. Preliminary calculations show that the dust content of bagged gypsum-based mortar is 7 to 2 times that of bagged cement-based mortar.
In the construction of bagged lightweight gypsum mortar, manual operation is often used to mix the lightweight gypsum mortar via a "power drill." In which room the workers must first stack the mortar. After opening each bag of mortar, the material must be poured into a small mixing bucket 5 to 7 times. In order to save working time, workers will use a shovel or wallpaper knife to poke several or dozens of bags of light gypsum mortar at a time to expose the mortar to the work surface, stir a bucket, and fill the bucket with a shovel. The dust will fly away if When this kind of building is in the peak period of dust removal, there will be dozens or hundreds of working surfaces on the project site every day, that is to say, there will be dozens or hundreds of dust spots at the same time. Each package of lightweight gypsum mortar is used through this contamination process. As you can imagine, on-site mixing of bagged gypsum-based mortar can be harmful to dust pollution.
How to make lightweight gypsum mortar pollution-free is a new topic faced by my country's ready-mixed mortar technicians. In order for the green water, fresh air and light gypsum mortar we breathe every day to develop healthily, the dust pollution problem of light gypsum mortar must be solved. In order to solve the dust pollution of lightweight gypsum mortar, lightweight gypsum mortar must be packed in bulk like cement. </p
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