Cementitious Gravel Nanoindentation Test and the Study of the Interface Transition Zone by Systematic Clustering Method
In response to the lack of research results on the micro mechanical properties of cementitious sand gravel materials and the uncertainty on the existence of interfacial transition zones,a method for determining the different phases of cementitious sand gravel and the size of interfacial transition zones is proposed.Combining the nanoindentation testing,the micro mechanical performance images are obtained,and the system clustering method is used to classify the test points in the test matrix.In the experimental stage,considering the material characteristics of cementitious sand and gravel,the testing system of"30-2-30"is improved.Based on the load depth curve and combining the Oliver phar method,the hardness H of the cementitious material is calculated as 0.18 GPa,corresponding to the reduced modulus Er of 13.13 GPa,and the hardness H of the gravel material is calculated as 8.60 GPa,corresponding to the reduce modulus Er of 84.56 GPa.In the calculation stage,the system clustering method is used to determine the range of the interface transition zone,and its size is determined to be approximately 18 μm.
nanoindentationcement sand-gravel materialshierarchical clustering methodinterfacial transition zone
万方数据
维普
