Pre-mixed mortar is generally divided into dry mixed mortar and wet mixed mortar produced by professional production plants. Dry mixed mortar: cement, dry aggregate or powder, additives and other components determined according to the performance, according to a certain proportion, in the professional production plant after measurement, mixed from the mixture, in the use of the site according to the specified proportion of water mixing. It is used for masonry, plastering, flooring and general waterproofing works. Wet mix mortar: cement, fine aggregate, mineral admixtures, admixtures, additives and water, according to a certain proportion, in the professional production plant after the measurement, mixing, transport to the site of use, and the use of the mixture in the specified time. Due to the dry mixed mortar production, transportation and storage more suitable for promotion and use, in just a few years the rapid development. At the same time, as more and more places in the world have higher and higher requirements for environmental protection, great efforts have been made to reduce dust pollution. Because wet mix mortar meets the high standard requirements of resource conservation and environment-friendly modern buildings, it has also been vigorously promoted. In this paper, the advantages and disadvantages of the two products are analyzed from the aspects of dry mixed mortar, wet mixed mortar production equipment, raw material selection, production technology, logistics and transportation and processing technology, etc., so as to provide more scientific and objective reference for rational selection. Dry mixed mortar adopts natural sand or machine-made sand as aggregate, and needs medium and large scale drying equipment to dry wet sand. In the process of drying wet sand, the excess dust is recovered by dust removal system. After drying, the sand is screened and graded according to the production process and quality requirements to achieve grading measurement and reasonable grading. And dry mixed mortar also has a small batch transport and packaging, to meet the needs of special bag market.The mixed mortar production line covers a large area, and the equipment input in the early stage is relatively large, but it can meet the diverse requirements of the construction market, and only the dry mixed mortar production line can produce special mortar that meets the market requirements and makes more profit than ordinary mortar, so the market prospect is relatively good. Wet mixing mortar equipment investment or modification cost is not high, the concrete enterprise product modification of the original concrete production equipment available, in conditions allow clear condition can separate a concrete production line production of wet mixing mortar, improve the utilization rate of equipment, to achieve the desired effect of the increase revenue, but concrete production line only limited in the production of wet mixing mortar, and not the production of a variety of special mortar. About manufacturing process, dry mortar before production, the need to dry the sand (drying process involves a certain electricity, coal, dust removal, equipment depreciation, artificial cost) after drying in the sand through high efficiency filter, sand grain size distribution in a controllable state, can meet the ordinary mortar even special mortar requirement for sand don't match at the same level, dry mortar production line not only can be used for scale production of bulk, also can be used for production independent packing bags, complete dry mortar production line with multiple additive storage warehouse and can accurately gauge, can produce a profit higher than that of ordinary special mortar dry mortar.
From dry mix mortar, wet mix mortar production equipment, raw materials, production, logistics, construction costs of each link for comparative analysis. Wet mortar is affected by construction conditions, weather, transportation and other factors, supply is also limited, wet mortar transportation cost is also relatively increased. Due to the different density of raw materials of dry mix mortar, segregation is easy to occur in the process of production, transportation and construction site storage. However, dry mix mortar can meet the requirements of construction and special mortar by scientific adjustment of fineness of sand and admixture composition. According to the environmental protection and quality requirements of various regions, the adoption of "dry and wet" and relevant policies will be more beneficial to ensure the quality of construction projects, improve the modernization level of construction, realize the comprehensive utilization of resources, reduce urban pollution, improve the atmospheric environment and realize sustainable development.