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<p>High-performance concrete with full aeolian sand (FA-HPC) is a novel cement-based material whose mechanical properties are strongly linked to its hydration characteristics and microstructure. In this study, a systematic investigation was conducted to evaluate the effects of cementitious materials, aggregates, fiber types, and curing regimes on the mechanical strength, hydration products, and microstructure of FA-HPC. The relative contribution of each factor to strength development was quantified using normalized statistical analysis, and the strength formation mechanism of FA-HPC was elucidated from a multi-scale perspective. The results showed that silica fume promoted the hydration through micro-filler and pozzolanic effects, thereby increasing the hardness and elastic modulus of both the cement paste and the interfacial transition zone (ITZ). Conversely, fly ash exhibited relatively limited enhancement due to its larger particle size and lower reactivity. Aggregates such as quartz sand, standard sand, and river sand—characterized by greater angularity and integrity than aeolian sand—produced a slight but measurable increase in concrete strength. Although steel fibers disrupted the dense packing system of FA-HPC, those with appropriate geometrical dimensions formed a uniform three-dimensional network within the matrix. Combined with their high elastic modulus and favorable interfacial bonding, these fibers positively contributed to the strength development of FA-HPC. High-temperature and hot-water curing further promoted hydration, refined the pore structure, and significantly increased mechanical strength. Normalized analysis indicated that the maximum relative contributions of cementitious materials, aggregates, steel fibers, and curing regimes to mechanical strength were 0.60, 0.49, 1.00, and 0.84, respectively. These results demonstrated that the superior mechanical performance of FA-HPC primarily arose from the synergistic effect of densified particle packing, high-quality hydration products, and enhanced fiber–matrix interface.</p>

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Mechanical properties, hydration characteristics, and microstructure of high-performance concrete with full aeolian sand: A macro-to-micro perspective

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Shaoqi Wu,
  • Mulian Zheng,
  • Jinghan Xu,
  • Wei Zhang,
  • Yizhe Zhou,
  • Zhongwen Ou

摘要

High-performance concrete with full aeolian sand (FA-HPC) is a novel cement-based material whose mechanical properties are strongly linked to its hydration characteristics and microstructure. In this study, a systematic investigation was conducted to evaluate the effects of cementitious materials, aggregates, fiber types, and curing regimes on the mechanical strength, hydration products, and microstructure of FA-HPC. The relative contribution of each factor to strength development was quantified using normalized statistical analysis, and the strength formation mechanism of FA-HPC was elucidated from a multi-scale perspective. The results showed that silica fume promoted the hydration through micro-filler and pozzolanic effects, thereby increasing the hardness and elastic modulus of both the cement paste and the interfacial transition zone (ITZ). Conversely, fly ash exhibited relatively limited enhancement due to its larger particle size and lower reactivity. Aggregates such as quartz sand, standard sand, and river sand—characterized by greater angularity and integrity than aeolian sand—produced a slight but measurable increase in concrete strength. Although steel fibers disrupted the dense packing system of FA-HPC, those with appropriate geometrical dimensions formed a uniform three-dimensional network within the matrix. Combined with their high elastic modulus and favorable interfacial bonding, these fibers positively contributed to the strength development of FA-HPC. High-temperature and hot-water curing further promoted hydration, refined the pore structure, and significantly increased mechanical strength. Normalized analysis indicated that the maximum relative contributions of cementitious materials, aggregates, steel fibers, and curing regimes to mechanical strength were 0.60, 0.49, 1.00, and 0.84, respectively. These results demonstrated that the superior mechanical performance of FA-HPC primarily arose from the synergistic effect of densified particle packing, high-quality hydration products, and enhanced fiber–matrix interface.