INFLUENCE OF CONCRETE’S MINERALOGICAL COMPONENTS ON FRACTURE COMPRESSIVE AND TRACTIVE
This is an approach to study the fracture behavior in concretes of standard, medium and high compressive strength, tested under compressive and tensile loads. Tensile loading was carried out by diametrical compression and also in a direct way using notched short rod cylindrical specimens. The study was focused on analyzing crack initiation and propagation in light of the water-cement ratio as well as the physical characteristics of the aggregates used. The compressive strength tested at 45 days, for standard and medium level of compressive strength’s concrete by ratios water-cement 0,5 and 0,6. For high strength concrete was used 0,36. Each group of concretes tested had three different geological coarse aggregate so its physical and mineralogical influence on the concrete’s microstructure could be analyzed by scanning electronic microscopy of the surfaces failure by compressive and tensile tests. The conclusions obtained for standard concretes did`nt show an important influence of the mineralogical aggregate’s composition in the 0,5 or 0,6 ratio’s water-cement on compressive, tensile and fracture toughness strength. On medium compressive strength’s concretes an increase on fracture toughness to increase the ratio water-cement 0,5 to 0,6 and a significant influence of the mineralogical composition of the aggregates in compressive and tensile strengths, were observed. About the high strength concrete the strong matrix composed by additive and silica fume are the principals influenced in highest results of compressive, tensile and fracture toughness proprieties.
Mary Patricia Morales Alfaro Fathi Aref Ibrahim Darwish
Universidade Federal Fluminense do Rio de Janeiro, Ex-Student of Master Degree Universidade Federal Fluminense do Rio de Janeiro, Principal Professor
国际会议
第九届工程结构完整性国际会议(The Ninth International Conference on Engineering Structural Integrity Assessment)
北京
英文
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）