作者：盛朝晖, 牛培飞, 游文斐

作者单位：河北工程大学土木工程学院，河北 邯郸 056021

关键词：再生混凝土;正交试验;力学性能;回归模型;抗冻性

摘要：

为研究不同因素、不同水平对再生混凝土力学性能的作用。该文通过正交试验研究钢纤维掺量、再生粗骨料掺量和粉煤灰掺量对再生混凝土力学性能（抗压强度、劈裂抗拉强度和抗折强度）的影响，确定各因素对再生混凝土力学性能的影响程度，并加以量化表征，并提出多因素共同作用下再生混凝土力学性能的多元非线性回归模型且进行验证。在此基础上，该文进一步研究再生混凝土的抗冻性。结果表明：再生混凝土的力学性能随钢纤维掺量的增加而提高；随粉煤灰掺量增加而降低；再生粗骨料掺量对再生混凝土的力学性能影响较小。钢纤维的掺入可提高再生粗骨料的掺量。再生混凝土力学性能的实测值与通过建立的回归模型得到的计算值的最大误差在6.5%以内。此外，钢纤维的掺入和减少再生粗骨料的掺量均可以提高再生混凝土的抗冻性。

Effect of multiple factors on mechanical properties and frost resistance of recycled concrete
SHENG Zhaohui, NIU Peifei, YOU Wenfei
School of Civil Engineering, Hebei University of Engineering, Handan 056021, China
Abstract: In order to study the effect of different factors and levels on the mechanical properties of recycled concrete. In this paper, based on orthogonal test, the effects of steel fiber content, recycled coarse aggregate content and fly ash content on the mechanical properties (compressive strength, splitting tensile strength and flexural strength) of recycled concrete were studied. Through quantifiable characterization, the impact of these variables on the mechanical properties of recycled concrete was determined. A multivariate nonlinear regression model was proposed to determine the mechanical properties of recycled concrete and verified. On this basis, the frost resistance of recycled concrete was further studied. The results show that the mechanical properties of recycled concrete increase with the increase of steel fiber content. However, the mechanical properties of recycled concrete decrease with the increase of fly ash content. In addition, the content of recycled coarse aggregate has little effect on the mechanical properties of recycled concrete. The addition of steel fiber into concrete can increase the content of recycled coarse aggregate. The maximum error between the measured value of mechanical properties of recycled concrete and the calculated value by the established regression model is within 6.5%. In addition, both the addition of steel fiber and the reduction of recycled coarse aggregate can improve the frost resistance of recycled concrete.
Keywords: recycled concrete;orthogonal test;mechanical properties;regression model;frost resistance
2021, 47(2):140-148  收稿日期: 2020-04-21;收到修改稿日期: 2020-05-26
基金项目: 国家自然科学基金项目(51708525)
作者简介: 盛朝晖(1969-),女,江苏无锡市人,讲师,博士,主要研究方向为建筑工程
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