The Research Of Autogenous Shrinkage Of Cement Based Materials

Autogenous shrinkage is a special phenomena of cementitious materials. Along with the wide application of the high performance concrete, people have concentrated more attention to autogenous shrinkage and looked it as a potentional infulunce of the durability of the concrete .At present, the research of the autogenous shrinkage is not all-around. The research of the shrinkage model, the mechanism of the various influences, the microstructal change and the calculation formula are all not maturity. The finished researches are more concentrated on the water cement ratio, the silica fume or the fly ash effect or the relative humidity changes.The paper collects the present research, then we do some respective experiment, analyse the microstructal changes and utilize the fuzzy evaluation. Based on the above research, we have systematically studied the autougenous shrinkage through the follow aspect:1 Summarize the present shrinkage model and analyse the character respectively.2 It is analysed that how the aggregate, fiber and super mineral powder influence the autogenous shrinkage.3 Utililizing the Mecury Instrution Porosimetry, we analyse the microstructual changes of the materials.4 Bring forward a AHP-FUZZY evaluation method to estimate the autogenous shrinkage of the high performance concrete.