| Abstrakt: |
To explore the influence of manufactured sand content on the flexural performance of self-compacting lightweight aggregate concrete (SCLC) beams, five SCLC beams with different manufactured sand dosage have been designed and fabricated for four-point bending tests. The workability and mechanical properties of the concrete mixture of each test beam are tested. It is observed that with the increase in the manufactured sand content, the workability of SCLC meets the standard requirements, and the mechanical properties are improved. The load–deflection curve, crack distribution pattern, and average strain of section are obtained through the four-point bending tests. The results reveal that the bending process of each test beam can be divided into three stages: uncracked stage, working stage with cracks, and failure stage. The average strain of section conforms to the assumption of plane section, and the load–deflection curve of each test beam is basically similar. With the increase in the manufactured sand content, the SCLC beam specimens exhibit more secondary cracks and more uniform crack distribution. Under the same level of load before yield, the maximum crack width decreases. The ultimate bearing capacity becomes maximum when the content of manufactured sand is 80%, which is 6.62% higher than that of SCLC beam with entire river sand. The plasticity coefficient of the resistance moment of the section is fitted by the experimental value, and the calculated value of cracking moment is in good agreement with the experimental value. Using the calculation formula for the maximum crack width of lightweight aggregate concrete and the fitting formula for the inhomogeneity coefficient of steel strain, the maximum crack width of each test beam is determined, which is in good agreement with the experimental value. Based on the test results and the calculated flexural bearing capacity, the optimal dosage of manufactured sand of SCLC concrete is obtained to be 60–80%. [ABSTRACT FROM AUTHOR] |
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