Abstract: In order to optimize lightweight toughness cement-based composites (LTCC), cenospheres and floating beads were used as aggregates, and hydrophilic polyvinyl alcohol (HPVA) fibers and polypropylene (PP) fibers were added. 12 groups of specimens were prepared to investigate the influence of aggregate and fiber contents on the compressive and flexural strength, bending toughness, tensile ductility and capillary water absorption of LTCC. Scanning electron microscopy was used to observe the microscopic morphology of the aggregates and the failure mode of the fiber after LTCC destruction. The results show that the apparent density of LTCC is 1 612 kg/m3 when the contents of cenospheres are 20% and the volume of HPVA fibers is 1.5%. The compressive strength and flexural strength of LTCC are 60.06 MPa and 20.55 MPa, respectively, and the ultimate tensile strain reaches 2.05%. Cenospheres and floating beads can fill tiny pores and refine the internal pores of LTCC, and thus reduce its capillary water absorption capacity. Cenospheres have higher pozzolanic activity and promote hydration reaction to produce hydration products with high Si/Ca ratio, which can improve the interfacial transition zone between aggregate and cement matrix, thereby improving the bending toughness and tensile ductility of LTCC.
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2020, Vol. 34 
