钢纤维自密实再生混凝土的力学性能

doi:10.16552/j.cnki.issn1001-1625.2024.0787

摘要/Abstract

摘要： 采用100%(质量分数)再生骨料(RA)的自密实再生混凝土(RASCC)是一种环保且具有高工作性能的绿色建筑材料,但其强度比纯天然混凝土低,这限制了RASCC的工程应用。通过加入钢纤维来提高RASCC的力学性能,采用抗压试验、劈裂抗拉试验和抗弯试验,研究最佳钢纤维体积分数V_f和长径比L_f/d_f,并在最佳V_f和L_f/d_f下比较不同RA替代率下RASCC的力学性能。研究结果表明:V_f和L_f/d_f对钢纤维自密实再生混凝土(SFRASCC)流动性的影响大于RA替代率的影响;与不掺钢纤维的RASCC相比,V_f为0.25%时,立方体抗压强度提升效果最好,提高了20.9%,而劈裂抗拉强度和抗弯强度则是在V_f为0.50%时提升效果最佳,分别提高了50.0%、58.3%;与不掺钢纤维的RASCC相比,L_f/d_f为33.3时,立方体抗压强度提升效果最好,而劈裂抗拉强度和抗弯强度则是在L_f/d_f为63.6时提升效果最佳;在钢纤维体积分数、长径比合适的情况下,使用30%RA或100%RA替代天然骨料均可行,但使用100%RA替代更环保。建立的SFRASCC立方体抗压强度和劈裂抗拉强度的计算公式可作参考。

关键词: 自密实混凝土, 再生混凝土, 抗压强度, 劈裂抗拉强度, 钢纤维

Abstract: Self-compacting concrete with recycled aggregate (RASCC) with 100% (mass fraction) recycled aggregate (RA) is an environmentally friendly and green building material with high workability, which limits its engineering application due to its lower strength than pure natural concrete. The mechanical properties of RASCC were improved by incorporating steel fiber, and compressive, split tensile and flexural tests were carried out to investigate the optimum steel fiber volume fraction V_f and length-to-diameter ratio L_f/d_f, and to compare the mechanical properties of RASCC under different RA replacement rates at the optimum V_f and L_f/d_f. The results show that the effects of V_f and L_f/d_f on the flowability of steel fiber reinforced self-compacting concrete with recycled aggregate (SFRASCC) are greater than those of RA substitution rate. Compared with RASCC without steel fiber, the best enhancement of cubic compressive strength is achieved at 0.25% V_f, which increases by 20.9%, whereas the best enhancement of split tensile strength and flexural strength is achieved at 0.50% V_f, which increases by 50.0% and 58.3%, respectively. Compared with the RASCC without steel fiber, the best improvement in cubic compressive strength is achieved when L_f/d_f is 33.3, while the best improvement in split tensile strength and flexural strength is achieved when L_f/d_f is 63.6. In the case of steel fiber volume fraction and appropriate aspect ratio, it is feasible to use 30% RA or 100% RA to replace the natural aggregate, but it is more environmentally friendly to use the replacement rate of 100% RA. The established formulae for the compressive strength and split tensile strength of SFRASCC cubes can be used for reference.

Key words: self-compacting concrete, recycled aggregate concrete, compressive strength, split tensile strength, steel fiber

中图分类号:

TU528.572

余芳, 李林柏, 姚大立. 钢纤维自密实再生混凝土的力学性能[J]. 硅酸盐通报, 2025, 44(1): 264-273.

YU Fang, LI Linbo, YAO Dali. Mechanical Properties of Steel Fiber Reinforced Self-Compacting Concrete with Recycled Aggregate[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(1): 264-273.

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