Influence of Grinding Method on Properties of Portland Cement Clinker and Cracking Resistance of Concrete
The operational principles of ball milling and impact powder milling were introduced in this paper.It proceeds to conduct tests and observations on the particle size and microscopic morphology of cement clinker produced by these two grinding methods.Subsequently,gypsum was added to each type of cement clinker to produce cement,and various properties such as water requirement for normal consistency,flexural strength(F),compressive strength(C),F/C ratio,and drying shrinkage of the cement were examined.Finally,the cracking resistance of concrete produced using both types of cement was evaluated through circular ring restrained shrinkage test.Results showed that the impact powder milling of cement clinker demonstrates a narrower particle size distribution and lower content of 0～10 μm fine powder compared to ball milling.Despite this,there is little disparity in clinker morphology between the two methods.Additionally,cement produced by impact powder milling exhibits reduced water requirement for normal consistency,superior later strength,increased F/C ratio,and decreased drying shrinkage compared to ball milling.Notably,the cracking resistance of concrete is better when cement is manufactured through impact powder milling as opposed to ball milling.Impact powder milling is suggested for the production of high cracking resistance Portland cement for railway applications.
万方数据
维普
