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<p>Manufactured sand (MS) has recently been considered a viable alternative to natural river sand (NRS), and clarifying its effect on concrete performance is crucial for scientific applications. This paper presents a series of experimental studies on the influence of MS content and characteristics on the workability and mechanical properties of UHPC. To explore the flexural performance of UHPC beams produced with granite-manufactured sand (GMS) as an alternative for NRS, a total of five UHPC beams with different GMS contents and longitudinal reinforcement ratios were fabricated for four-point bending tests. The results indicated that the compressive strength (CS) of UHPC increased by 4.32% and 3.09%, but the tensile strength (TS) decreased by 13.04% and 23.68% when 40% NRS was replaced with GMS and basalt-manufactured sand (BMS), respectively. The flexural performance of the GMS-UHPC beam was similar to that of the NRS-UHPC beam but exhibited a greater occurrence of secondary cracks and a more evenly distributed crack pattern. The cracking load and ultimate load decreased by 25% and 12.5%, respectively, when the GMS content increased from 0 to 60%. However, these loads increased by 33.33% and 42.86%, respectively, when the longitudinal reinforcement ratio increased from 0.71 to 1.26%. Properly increasing the longitudinal reinforcement ratio can offset the adverse effects of the GMS and allow the flexural performance of GMS-UHPC beams to be more fully exerted. The calculation models for the cracking moment and flexural capacity of the GMS-UHPC beams were proposed considering the effect of the GMS content, and the calculated values were in good agreement with the test results.</p>

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Flexural Response of UHPC Beams Produced with Manufactured Sand as Alternatives for Natural River Sand: Experiment and Theory

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Yang Jiao,
  • Jianan Qi,
  • Chen Liu,
  • Jingquan Wang

摘要

Manufactured sand (MS) has recently been considered a viable alternative to natural river sand (NRS), and clarifying its effect on concrete performance is crucial for scientific applications. This paper presents a series of experimental studies on the influence of MS content and characteristics on the workability and mechanical properties of UHPC. To explore the flexural performance of UHPC beams produced with granite-manufactured sand (GMS) as an alternative for NRS, a total of five UHPC beams with different GMS contents and longitudinal reinforcement ratios were fabricated for four-point bending tests. The results indicated that the compressive strength (CS) of UHPC increased by 4.32% and 3.09%, but the tensile strength (TS) decreased by 13.04% and 23.68% when 40% NRS was replaced with GMS and basalt-manufactured sand (BMS), respectively. The flexural performance of the GMS-UHPC beam was similar to that of the NRS-UHPC beam but exhibited a greater occurrence of secondary cracks and a more evenly distributed crack pattern. The cracking load and ultimate load decreased by 25% and 12.5%, respectively, when the GMS content increased from 0 to 60%. However, these loads increased by 33.33% and 42.86%, respectively, when the longitudinal reinforcement ratio increased from 0.71 to 1.26%. Properly increasing the longitudinal reinforcement ratio can offset the adverse effects of the GMS and allow the flexural performance of GMS-UHPC beams to be more fully exerted. The calculation models for the cracking moment and flexural capacity of the GMS-UHPC beams were proposed considering the effect of the GMS content, and the calculated values were in good agreement with the test results.