Experimental Study on Static Compression of Steel-PE Hybrid Fiber Cement-based Composites after High Temperature
In order to study the effect of subhigh temperature on the compression properties of steel-polyethylene hybrid fiber cement composite(S/PE-HFRECC),static compression tests were carried out after subhigh temperature cooling.PE2,S0.5PE1.5,S1PE1,S1.5PE0.5 and S2 samples were made by mixing steel fiber and PE fiber into cement-based materials by controlling the total fiber volume content to 2%and changing the two fiber content.The static compression test results of the samples with different fiber ratios were analyzed,and the results showed that:(1)Steel fiber mainly played the role of strengthening,PE fiber mainly played the role of toughening.(2)When the test temperature was 200℃or below,the static compressive strength of the specimen would not change significantly due to the rise of temperature.At 300℃,the static compressive strength of all kinds of specimens increased to different degrees,and the compressive strength of S1.5PE0.5 and S2 specimens was the highest.At 400℃,the compressive strength of all specimens except S2 decreased.(3)The peak strain of all types of specimens increased gradually with the increase of temperature.When the temperature was the same,the peak strain of each type of specimen was positively correlated with the PE fiber content,indicating that the addition of PE fiber can improve the deformation capacity of the specimen.(4)The toughness before the stress peak of S2 specimen increased with the increase of temperature,while other specimens showed a trend of first increasing and then decreasing with the increase of temperature.The toughness of S2 specimen reached the maximum before the stress peak at 400℃,while the toughness of other specimens reached the maximum at 300℃.When the temperature was more than 300℃,the toughness before the stress peak of S1.5PE0.5 specimen was higher than that of other specimens.
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