Study on performance of lightweight concrete with recycled concrete aggregate with different fiber content
The properties of polypropylene(PP)fiber-reinforced recycled lightweight concrete with recycled concrete as aggregates(RCLC)was experimentally studied.The RCLC was mainly prepared by ordinary Portland cement,recycled waste concrete coarse aggre-gate,PP fiber and foam.By taking the content of PP fiber as a variable,the RCLC samples were tested in laboratory.The results showed that the flowability of slurry decreased with the increase of PP fiber dosages.When the gradation of recycled coarse aggregate(i.e.,the mass ra-tio of five-type aggregates sized,respectively,from 9.5 mm to 16 mm,from 16 mm to 19 mm,from 19 mm to 26.5 mm,from 26.5 mm to 31.5 mm and from 31.5 mm to 37.5 mm)is 2∶4∶8∶3∶3 and the volume ratio of aggregates takes 30％,it is recommended that the slurry fluid-ity should be greater than 210 mm.The compressive strength and splitting tensile strength of the specimens increased first and then de-creased with the increase of the content of PP fiber,which indicated that PP fiber has limited effect on improving the performance of RCLC.Besides,the addition of PP fiber will reduce the early compressive strength and splitting tensile strength.Further,when the fiber content increased from 0 to 0.2％,the porosity increased and the average pore diameter decreased.
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