The Preparation And Properties Of Magnesium Oxychloride Cement Super-light Foam Concrete

As an inorganic building materials, foam concrete, which is light weight, well insulation, un-fire performance and other advantages, has been widely used already in construction engineering in our country. The majority of cementitious material includes ordinary Portland cement, fast hardening sulphoaluminate. The magnesium ocychloride cement material has plenty of benefits, such as light weight, condensing and hardening in a quick way, high strength, un-fire performance and so on; Application of magnesium ocychloride cement material prepares to foam concrete which can further decrease its light weight with concrete product, increasingly improve the strength, but the magnesium ocychloride cement material property is not stable, such as the earliest with moisture absorption Pan of halogen, deflection, resistance to weathering poor and any another shortcomings, it is greatly apparent in humid and water environment. In this paper, by changing the magnesium ocychloride cement material in the experiment research,we could produce a new one in high properties foam concrete。First, in this article through optimization design research that the molar ratio of light calcinesia magnesia and magnesium oxychloride, the water-cement ratio, the temperature of the experiment, the content of hydrogen peroxide, more research with miserable amount of water reducer, retarder, PP fiber, the result showed that the molar ratio of light calcinesia magnesia and magnesium oxychloride increase can lead to improve with the magnesium oxychloride cement foam concrete of strength、decrease density; the water-cement ratio decrease can lead to improve the strength, water absorption water resistance; with the content of hydrogen peroxide increase can lead to more further decrease density; the temperature of the experiment improve can lead to improve the early strength; the miserable amount of retarder with0.5%can help magnesium ocychloride cement material forming; the miserable amount of water reducer and PP fiber can improve the module strength; through the above research identified that magnesium ocychloride cement material basic ratio is the molar ratio of light calcinesia magnesia and magnesium oxychloride was7:l,water-cementratio was0.55, the content of hydrogen peroxide was8%, water reducer was0.2%,retarder was0.5%, PP fiber was0.2%。Furthermore, exploring through four water resistant admixture, which includes NH4H2PO4, NaH2PO4, MgSO4, FeSO4·7H2O to change the magnesium oxychloride cement super-light foam concrete property, and research its through the microscopic analysis, the result that was discover which different admixture put intocan lead to change the magnesium oxychloride cement super-light foam concrete structure so that change the magnesium oxychloride cement super-light foam concrete every property; with our water resistant admixture put into, the module water resistance property can apparent increase, reduced after freezing and thawing rate of loss of strength and shrinkage; and with miserable amount increase of NH4H2PO4, decrease the shrinkage rate of the test module; with miserable amount increase of NaH2PO4, the module K can decrease reach1.122,with miserable amount increase of MgSO4,the test module compressive strength can reach0.3MPa and water absorption teach20%;with miserable amount increase of FeSO4·7H2O, the test module density can reach140.7kg/m3。The third, through four admixture optimizations design research and microscopic analysis, the tesult that was MgSO4、FeSO4·7H2O had a significant effect on the compressive strength of the trial;FeSO4·7H2O had a significant effect on the density, water absorption, thermal conductivity, after freezing and thawing rate of loss of strength of the trial, NH4H2PO4NaH2PO4had a significant effect on the shrinkage of trial; NaH2PO4had a significant effect on the water resistant performance of trial, the ninth experiment every property is the most optimum, the density can reach121.4kg/m3,28day compressive strength reach0.199MPa, K reach0.9,thermal conductivity reach0.067W/(m·k), air height reach36.7cm。...