Concrete admixture and cement does not adapt will cause the concrete quality fluctuation, serious when can affect construction. Therefore, the construction unit and the cement and admixture producers must take the necessary measures to reduce or avoid unsuitable phenomenon, mainly from the following several aspects to consider:
( 1) strengthen mill material temperature control
Due to the control of C3A hydration depends on the pore solution of sulfate ion balance, so the cement manufacturers must pay attention to control of calcium sulfate cement content and dissolution rate, strengthen the mill material temperature control, to avoid the high and low temperature, the control of cement manufacturers is nothing difficult.
The implementation of ISO standard, China's cement fineness is generally improved, in this case, strengthen the mill material temperature control of cement, gypsum composition and content of stability, for the control of superplasticizer and cement between the adaptability is very important.
( 2) a separate ground cement mixed material
Super fine cement mixed material can help to" water" effect, improve the mixture material in cement fineness, without reducing the admixture condition, can improve the cement strength; while maintaining the strength of cement mixed material conditions, can increase the volume, reduce the production cost of cement, cement and the adaptability of water reducing agent. Therefore, in cement plant cement mixed material is individually milled to produce high quality cement feasible technical measures of.
( 3) the preparation of concrete, can adopt the latter admixing method or batch addition method measures such as adding water, improve the workability of concrete. After mixing, superplasticizer was absorbed by only a small number of ettringite, so little slump loss.
( 4) the use of reactive polymeric compounds
The use of reactive polymeric compounds used as concrete admixture, the compounds of cement hydration in the alkaline conditions slow response, so that the concrete slump loss is reduced, but also improve the workability of concrete is one of the measures.
In conclusion, cement and admixture between the adaptability is a certain history and with concrete science and technology development, especially the high strength, high performance concrete research, development and application has made of cement and admixture between adaptive at home and abroad to become a concrete research field, is one of the most perplexing problems, has not completely come up from theory to explain this phenomenon. We on the adaptability between the cement and superplasticizer are studied, the effects of cement and water reducer compatibility between there are many factors, some still remain further, in-depth study. Such as: cement retarder gypsum, cement itself ( alkali alkali soluble and insoluble alkali ) and other factors on the adaptability of cement and water reducer effect problem. Project site if there is not adapted to the problem of cement and admixture, must use test method to try to solve the.