Study On Enginering Application And Technology Of Low Alkali Cement Production

People had sufficient cognition to alkali that is in cement-concrete and its harm. So far, the large numbers example of AAR has been discovered in many countries the world, AAR has already became to a kind of most serious cause that destroy the building and component of cement concrete and affect its wear. Along with people improve the request of concrete building's wear, the new request of performance of cement that has cementation functionary in cement-concrete. How can take from content of alkali in cement? How can improve performance of cement? Accordingly abate bane of alkali in cement, restrain breach of AAR inside concrete, improve the wear of building and abate circumstance's burthen has became the problem that been regarded at large by people now. The paper takes practice production for our studying object, and carries through two aspects of researches about production of low-alkali cement clinker and the high performance compound low-alkali cement make use of industry waste residue.Through the researches, we found that raw material of high silicon low alkali gritstone composition and high alkali clay composition had been calcined under 1400℃, so f-CaO in clinker is lower than 1.0%, even lower than this number. So clinkerability of raw material of the two compositions is choiceness, although they differ in quality. Because we will control the content of alkali in clinker, although the clinkerability of high silicon low alkali gritstone composition is insufficient a little, but it's a good composition. The best control parameters of high silicon low alkali gritstone composition are: adopting "three-high rates" composition, in a specific way, three rates should choose KH:0.9, SM:2.6, IM:1.6, and control the granularity of raw material is 280m /kg. Hereinbefore conclusion had been substantiated by engineering application. For the capability of physics and mechanics of compound low-alkali cement, the effect of the different granularity of its each component is not alike. Factors which affect itsprimeval (3d) cement strength were in turn clinker, fly ash, phosphate slag . Factors which affect its 3d-days strength were in turn phosphate slag, clinker, fly ash. The best control parameters of three component's granularity of compound low-alkali cement are: the granularity of clinker is 420 m2/kg, the granularity of fly ash is 450 m2/kg, the granularity of phosphate slag is 500 m2/kg; For the capability of compound low-alkali cement, the phosphate gypsum of calcinations with high temperature and high calcium fly ash were different effect. Especially if we enlarge specific surface area of high calcium fly ash, we can efficiently enhance primeval strength of compound low-alkali cement that has mixed phosphate slag. The capability's advantage of compound low-alkali cement was made sure by research of compound low-alkali cement and Portland cement's hydrate caloric, cement early hydrate structure, AAR, wear of concrete. So for restraining breach of AAR inside concrete, improving its wear and abating circumstance's burthen, mix phosphate slag and fly ash into cement have certain value.