Eccentric compression performance of polypropylene fiber lithium slag concrete column subjected to loading and thermal-cold cycles
To investigate the eccentric compressive behaviors of polypropylene fiber lithium slag concrete(PLiC)column after therma-cold cycles and coupling stresses,6 PLiC columns and 2 contrast concrete column were fabricated.After applying coupling stresses of 0,0.10,0.20 and 0.35,and the corresponding static eccentric compressive experiments after 0,100,200,300 times therma-cold cycles were carried out.The effects of the number of therma-cold cycles and coupling stress ratio on eccentric compression performance of PLiC columns were investigated.The results show that the single-doped lithium slag has little influence on the failure form,ductility,cracking load and ultimate load of the test column,but there is no obvious concrete collapse phenomenon when the PLiC column is mixed with 1.2 kg/m3,and the deformation performance is better,the ductility is increased by 24.7％,the cracking load is increased by 3.5 times and the ultimate load is increased by 24.73％.When the coupling stress ratio is unchanged and the number of cracks increases from 100 to 300 times of therma-cold cycles,the cracks of PLiC columns are more and more dense,the ductility coefficient increases by 8.6％,and the ultimate bearing capacity decreases by 33.56％.When the coupling stress ratio increases from 0.10 to 0.35,the ductility coefficient changes little and the ultimate bearing capacity decreases 34.55％.In this experiment,the temperature difference between hot and cold cycles is 58 ℃.which can provide some reference for the design of concrete structures in the environment of large temperature difference in western China.
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