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从不同配合比的钢纤维再生混凝土的抗折强度出发,对其在路面工程应用中的最佳配合比进行了较为系统的研究和分析。结果表明:再生粗集料的含量和水灰比等因素对钢纤维再生混凝土的抗折强度影响较大,在设计抗折强度为6.0 MPa,钢纤维的掺量在1.0%的条件下,当再生粗集料的含量小于50%,水灰比在0.44～0.47之间时,钢纤维再生混凝土28 d的抗折强度比较接近于基准钢纤维混凝土,而超出此范围时,钢纤维再生混凝土的抗折强度则会明显降低。最后结合工程应用对含30%再生粗集料的钢纤维再生混凝土的相关性能进行了检测,结果证明适当配合比的钢纤维再生混凝土能够满足级刚性路面的抗折强度要求。
Based on the flexural strength of steel fiber recycled concrete with different proportions, the optimal mix proportion of steel fiber recycled concrete in road engineering application was systematically studied and analyzed. The results show that the content of recycled coarse aggregate and the ratio of water to cement have a great influence on the flexural strength of steel fiber recycled concrete. Under the condition of designed flexural strength of 6.0 MPa and steel fiber content of 1.0% When the content of recycled coarse aggregate is less than 50% and the water-cement ratio is between 0.44 and 0.47, the flexural strength of recycled steel fiber reinforced concrete for 28 d is relatively close to that of steel fiber reinforced concrete. When it exceeds this range, the steel fiber recycled concrete Flexural strength will be significantly reduced. Finally, the correlation performance of steel fiber recycled concrete with 30% recycled coarse aggregate was tested in combination with engineering application. The results show that the steel fiber recycled concrete with appropriate proportion can meet the requirement of flexural strength of rigid grade pavement.