Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update

Study on the Influence of Freeze-thaw Cycles on the Tensile Strength and Fracture Toughness of Concrete

MENG Ling-tong;YANG Shu-tong;YANG Song;College of Engineering, Ocean University of China;  
The fracture behavior of concrete beam specimens with different initial notch lengths after freeze-thaw was studied by using three-point bending test. Based on the boundary effect model, the coefficients reflecting the material discontinuity and inhomogeneity were introduced, and the maximum fracture load of the specimens was used to determine the real tensile strength and fracture toughness of concrete under different freeze-thaw cycles times. The results show that as the number of freeze-thaw cycles increases, the tensile strength and fracture toughness of concrete are obviously reduced. Compared with the specimens without freeze-thaw cycles, the tensile strength and fracture toughness of concrete are reduced by more than 38% when the number of freeze-thaw cycles reached 75 times. The tensile strength obtained based on the boundary effect model is significantly higher than the splitting tensile strength of concrete due to the incorporation of the discontinuity and non-uniformity of materials, and can more accurately reflect the deterioration and damage degree of concrete after freeze-thaw action.
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved