EXPERIMENTAL STUDY ON THE BONDING PROPERTIES OF STEEL REINFORCEMENT WITH DIFFERENT STRENGTHS OF GEOPOLYMER CONCRETE
In the production process of cement,the energy consumption is high and the pollution is serious.Geopoly-mer concrete has the characteristics of energy saving and emission reduction,and is expected to be widely used in the field of building materials.In the paper,the center pullout tests of steel bar-geopolymer concrete bond specimen is carried out to analyze the bond damage mechanism between steel bar and geopolymer concrete.We investigate the influence law of geopolymer concrete on its bond damage in terms of compressive and splitting tensile strength as well as bond length.The results show that under the condition of 14 mm bar diameter and 5 d bond length,the rela-tive protective layer thickness c/d=4.86 is the critical point of the damage mode from pullout damage to splitting dam-age in the center drawn specimen of steel bar-geopolymer concrete.For the center drawn specimen of steel bar and geopolymer concrete with d=14 mm bar,the bond length of 7 d bar leads to the yielding of the steel bar earlier than the pullout of the steel bar and the splitting of the concrete.The study may provide theoretical experience on the sub-sequent bonding performance between steel bars and geopolymer concrete for the application of geopolymer concrete in practical engineering.
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