Development history of ready-mixed mortar
Building mortar has a long history, and mineral mortar is used from the beginning of buildings. Gypsum mortar was used by the Babylonians around 3000-4000 BC. The use of lime mortar can be traced back to about 3000 years BC. The hydraulic mortar made of volcanic ash may also have a history of 3,000 years. Cement mortar and mixed mortar are widely used after the introduction of Portland cement. In 1893, the French company Trranova first began producing dry-mixed mortar. Therefore, Europeans can be considered to have invented dry mortar. Later, in 1905, Montenovo and 1927 wulframix were established, and the application of dry mortar was gradually recognized. Since the 1950s, chemists have been working on the study of dry-mixed mortar tackifiers, dispersible polymer powders. In 1957, Wacker was the first to produce redispersible homopolymer powder, paving the way for successful development of the series. By the 1970s and 1980s, the degree of premixing of mortars in the European and American markets was already high, which led to the formation of an important emerging industry.
There is no doubt that mortar construction relies on manual technology before machinery appears. The skill level of the technical level, the habits of the operators, and the manpower of the manpower directly determine the merits of the mortar construction effect. It is undeniable that after thousands of years of development, the level of artificial technology has reached a peak, and highly skilled operators can rely on experience to quickly determine the raw materials, ratios, and methods of operation that are most suitable for local construction, and reach the builders. Claim. However, when people who are willing to do manual operations, raw materials are scarce or scarce, construction quality requirements are unchanged or even improved, it is a problem to continue to maintain the original operation mode, and this situation will become worse as time goes by. .
Germany faced such a similar problem after the end of World War II. The lack of people, the lack of materials, and the large number of broken buildings need to be repaired, so they solved this problem successfully by mechanized construction, and then they were borrowed and widely promoted by other European countries. Therefore, the production of ready-mixed mortar in Germany is large, the variety is large, the application range is wide, and the technical content is also at a relatively high level. In Germany, with a land area of 360,000 square kilometers and a population of about 82 million, the amount of construction mortar used in Germany was 11.43 million tons in 1999. By 2000, there were more than 150 dry-mixed mortar plants with an annual output of 100,000 tons. There is one large dry-mix mortar plant for every 500,000 people. In 2002, the amount of cement used in Germany was 28.8 million tons, of which 13.4 million tons were used for ready-mixed concrete, 9.4 million tons for concrete prefabricated parts, and 2.5 million tons for ready-mixed concrete. 1.8 million tons of mortar is mixed, and 1.7 million tons is used for other projects. The average price of cement is 800-900 yuan per ton.