Experimental study on compressive property of self-compacting concrete after high temperature cooling
To research the compressive properties of self-compacting concrete(SCC)after high temperatures,48 standard cubic concrete specimens with C35 strength were produced,and the effects of natural cooling and water cooling methods on the apparent state,compressive strength,peak stress,and failure shape of SCC specimens after high temperature were analyzed by conducting simulated fire tests at different temperatures.The results show that the number of noticeable cracks of the specimens under the two cooling methods gradually increased with the increase of the target temperature,and the edges of the specimens showed obvious spalling during the water cooling process after experiencing high temperatures of 600℃and 700℃.The compressive strength of the specimens under the two cooling methods shows a decreasing trend,however,there is an anomalous phenomenon that the compressive strength of SCC specimens with natural cooling after 300℃is significantly enhanced compared with that of the natural cooling specimens at 100℃and 200℃,with an increase of 8.1%and 9.9%.Meanwhile,with the increase in target temperature,the peak stress of the stress-strain curve of SCC decreased significantly,and the corresponding peak strain increased significantly.Finally,the parameters of the SCC axial compressive stress-strain constitutive equation were given,and the fitting curve can be in good agreement with the experimental data.
self-compacting concretecooling methodhigh temperature effectcompressive strengthfailure shapeconstitutive equation
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