The two most commonly used mortars in dry mortars are cut-and-build mortars and plastering mortars.
Cutting mortar is used for masonry walls and is formulated with cement (425#), dry sand, fly ash, cellulose ether (HPMC), and redospersoble polymer powder (VAE)
Plastering mortar is used for plastering and leveling of walls after completion of masonry and is formulated with cement (425#), dry sand of medium fineness, fly ash, cellulose ether (HPMC), wood fibers, and redospersoble polymer powder (VAE)
In masonry mortar, the proportion of dry sand is an important issue. When laying walls, the mortar should contain about 5mm of coarse sand as an aggregate for compression. Also, when laying bricks, the mortar layer needs to contain coarse sand as an aggregate to resist compression and keep the mortar layer from deforming. Therefore, in dry sand, different grades of particles such as 0.5mm, 3mm, and 1mm need to be included.
By adding cellulose HPMC and dispersible latex powder, the water retention of the mortar is improved, as well as the compressive and plastic change resistance of the mortar. In plastering mortar, it is no longer necessary to add coarse sand of about 5mm, only medium and fine sand can be used. In addition, the addition of a small amount of fly ash can effectively reduce the cost of mortar, and improve the workability and ease of mortar.
Dry mortar plant, dry mix mortar production line, dry mix mortar equipment, dry mortar production line most of the production capacity of 20-80 tons per hour, and most of them are equipped with a bulk system, the finished mortar transported to the construction site of the portable mortar storage silo, waiting for the humidified and mixed for use. If customers can purchase dry sand or mechanism sand, the river dryer is not installed in the dry mortar production line and dry mortar equipment. If there is no dry sand raw material locally, the dry mortar production line comes with a sand dryer system.
The river sand dryer system, dust collection system, cyclone dust collector, and pulse dust collector in the whole set of equipment are matched to complete the dust removal and induced air needs of the dryer. During the operation of the dryer, the soil in the sand will be separated from the dry sand at the same time. After the wet sand is dried by the dryer, the dry sand with different mesh sizes will be stored in the dry sand storage silo through the bucket elevator and linear probability vibrating screen to satisfy the need for dry sand grading. Generally set up 2-3 dry sand storage silos, storage storage capacity of 80-200 tons.
Bulk cement and fly ash are ejected to different storage silos by the pneumatic conveying device of transportation trucks, and the finished products are conveyed to the finished mortar storage silo through a fully automatic batching system, batching weighing hopper, PLC control system, mixing machine, and bucket lifter. The bottom of the storage silo is 5 meters high from the ground and installed with an automated dry ash bulk machine, the mortar trucks drive to the bottom of the finished product storage silo, and the finished mortar is unloaded into the dry mortar trucks through the dry mortar loading spouts or known as cement bulk loader. Generally, each vehicle is loaded with about 30T.
Some customers only have cement bulk trucks to pneumatically convey the cement raw materials to the storage silo. For fly ash or calcium carbonate, there is no conveying device, so in dry mortar production, a pneumatic conveying system will be installed in the dry mortar equipment to convey the powder raw materials to the corresponding storage silo using high-pressure roots blower, airtight pressure silo.
Auxiliary chemical raw materials such as HPMC, CMS, etc. are also set up in different small storage silos. Automatic weighing and batching systems for bulk raw materials
automatic weighing and batching systems for bulk raw materials, and at the same time with more refined automatic batching systems for auxiliary raw materials. The automatic dosage of both bulk and auxiliary raw materials is realized at the same time to meet the time requirements of the mixing process. In general, the mixing time of each batch is within 2 minutes, and the mixing of 30 batches per hour is easily realized. For example, mixing 2 tons per batch, i.e. 60 tons per hour production capacity.
In the dry mortar production line or dry mortar equipment, the dry mortar mixer adopts Double-Axis Paddle Gravity-Free Mixer or plough mixer as the mixing center, and screw conveyor with a fine screw conveyor to complete the full-automatic batching under the PLC control system.
The bucket elevator completes the vertical transportation of dry sand and finished mortar. Meanwhile, in the dry mortar production equipment, several small pulse dust collectors are installed to deal with the dust point in the production process in time. In the process of dry sand screening and finished product conveying, it is necessary to unload the materials to different storage bins, so automatic distribution devices such as 2-position combined distributors and 3-position distributors are installed.
