骨料坚固性对混凝土力学与耐久性能的影响研究

吕兴栋; 曹亚; 李响; 董芸

doi:10.13928/j.cnki.wrahe.2025.S1.129

水利水电技术（中英文） ›› 2025, Vol. 56 ›› Issue (S1) : 879 -884. DOI: 10.13928/j.cnki.wrahe.2025.S1.129

水工材料

骨料坚固性对混凝土力学与耐久性能的影响研究

吕兴栋 ¹^,² ,
曹亚 ¹^,² ,
李响 ¹^,² ,
董芸 ¹^,²

作者信息 +

Influence of aggregate soundness on mechanical properties and durability of concrete

Xingdong LYU ¹^,² ,
Ya CAO ¹^,² ,
Xiang LI ¹^,² ,
Yun DONG ¹^,²

Author information +

文章历史 +

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摘要

针对长距离输水隧洞工程人工骨料坚固性超标的问题，研究了不同坚固性的骨料对混凝土力学和耐久性能影响。采用不同坚固性的原岩调配成坚固性为四个等级的粗细骨料，其中，I级为细骨料(≤8%)+粗骨料(9%~11%),II级为细骨料(8%~10%)+粗骨料(14%~16%),III级为细骨料(10%~15%)+粗骨料(19%~21%),IV级为细骨料(>15%)+粗骨料(>25%)。结果表明，随着骨料坚固性等级的降低，混凝土抗压强度、轴拉强度和极限拉伸值呈现整体下降趋势，混凝土抗冻性能、抗渗性能也呈现降低的趋势。第II级、第III级和第IV级的氯离子扩散系数比第I级分别高1.3×10^-12m²/s、2.8×10^-12m²/s和2.5×10^-12 m²/s。采用第I级—第IV级坚固性骨料制备的混凝土抗硫酸盐侵蚀等级均可达到KS120,但骨料坚固性等级对混凝土抗硫酸侵蚀性能影响不显著。研究成果为水利水电工程其他骨料料源类似问题的解决提供技术储备和参考，为拓宽骨料料源选择范围、推动相关规范更加适应实际工程需求奠定技术基础。

Abstract

Regarding the issue of the soundness value excessive of artificial aggregates in long-distance water conveyance tunnel engineering, the influence of aggregates with different soundness values on the mechanical and durability performance of concrete was studied. Using raw rocks with different firmness, four grades of coarse and fine aggregates are prepared. Among them, Grade I is fine aggregate ≤ 8%+coarse aggregate 9%~11%, Grade II is fine aggregate 8%~10%+coarse aggregate 14%~16%, Grade III is fine aggregate 10%~15%+coarse aggregate 19%~21%, and Grade IV is fine aggregate>15%+coarse aggregate>25%. The result show that as the strength level of aggregates decreases, the compressive strength, axial tensile strength, and ultimate tensile value of concrete show an overall downward trend. The frost resistance, and impermeability of concrete also show a gradually decreasing trend. The diffusion coefficients of chloride ions in the second, third, and fourth stages are 1.3×10^-12 m²/s, 2.8×10^-12 m²/s, and 2.5×10^-12 m²/s higher than those in the first stage, respectively. The concrete prepared with Class I to IV aggregates can achieve a sulfate resistance level of KS120, but the strength level of aggregates has no significant impact on the sulfate resistance performance of concrete. The result provide technical reserves and references for solving similar problems with other aggregate sources in water conservancy and hydropower projects, laying a technical foundation for expanding the selection range of aggregate sources and promoting relevant regulations to better adapt to actual engineering needs.