Dry Mixing Mortar Preparation And It's Perforty Research

Building mortar is one of the most universal building-engineering materials, and 25~40 percents of cement amount is manufactured into building mortar according to last statistic. Conventional building-mortar is usually blent into in the construction local, which possesses many defects such as low accuracy of mixture ratio, poor stability of quality, contractility of bigness, broad fluctuation of felted strength, anti-penetrability of feebleness, collapse of easiness and ect, and it is vital reason, resulting in lots of engineering quality accidents as following: crack in the wall, swelling, penetration, and collapse. Mortar made in the local is at the cost of wasting materials and contaminating environment. There has been a new commercial industry that mortar is mixed at a large scale in advanced country. Commercial mortar is divided into two forms between wet-mortar and dry-mortar, and the latter is developing in our country. Dry-mortar encounters large market and development interspace, due to many advantages of agility, multiformity, preservation, and adjustability. Current researches on dry-mortar are focused on localizable technique, craftwork, and machine of production in our country.Regarding raw material and waste slag in Kunming city as research objection, and studying correlative technique and influence factors of producing dry-mortar, there are five parts in the dissertation as following: (1) Choose appropriate raw material made from dry-mortar after investigation, analysis and filtration. (2) According to National Building Mortar Design Regulations (NBMDR), and applying to scientific avenue of orthogonal design experiment, Performance and impact factors of dry-mortar produced by localizable phosphor slag, flying-ash, ordinary silicate cement, and yellow sand. By means of modern testing instrument such as XRD, SEM, hydration token and structure of hardened mortar are analyzed and condign production parameters are obtained. (3) The feasibility of manufacturing dry-mortar is discussed, replacing yellow sand withphosphor slag. (4) The feasibility of producing dry-mortar is analyzed, replacing sulphur aluminate low alkalinity cement by silicate cement. (5) Study impact of the water quantity of sand on the strength of dry-mortar, and it is concluded that water quantity of sand can influence strength effectively and must be controlled seriously in production.Conclusion is drawn that 150# mortar can be manufactured, adopting industrial waste slag, yellow sand and cement after which are ground, and with the proportion design of cementitious component : sand of 1: 4, cement: phosphor slag: flying-ash: gypsum of 30:45:23:2 in cementitious materials, and cement: mortar of 6 percents. It leads economical, social, and environmental benefit. There is no dissociative CH and bigger porosity existing in hardened mortar, depended on the testing results of XRD and SEM, and this entire characteristic expresses its excellent anti-penetrability and durability.It is reinforced that mortar produced by the system of phosphor slag梖lying ash梒ement or replacing phosphor slag by yellow sand has never been reported in home and abroad.