钢纤维粉煤灰再生混凝土强度正交试验研究
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国家自然科学基金资助项目(51278182);湖南省大学生研究性学习和创新性实验计划资助项目(湘教通[2013]191号)


Orthogonal Experimental Study on Strength of Steel Fiber Reinforced Fly Ash Recycled Concrete
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    摘要:

    利用正交试验方法对钢纤维粉煤灰再生混凝土(以下简称再生混凝土)的强度性能进行了试验,考察了粉煤灰取代率(质量分数)、钢纤维掺量(体积分数)和再生粗骨料取代率(质量分数)对再生混凝土28d立方体抗压强度、劈裂抗拉强度和抗折强度的影响,并对试验结果进行了系统分析.结果表明:粉煤灰取代率对再生混凝土抗压与抗折强度的影响规律一致,但对其劈裂抗拉强度的影响规律却不相同;再生混凝土抗压强度、劈裂抗拉强度和抗折强度均随钢纤维掺量的增加而增大,但钢纤维掺量对劈裂抗拉和抗折强度的影响显著,对抗压强度的影响较小;再生粗骨料取代率对抗压强度、劈裂抗拉强度和抗折强度的影响规律基本一致,强度总体上随再生粗骨料取代率的增大而增大.要使再生混凝土强度得到提高,需降低粉煤灰的取代率,增大钢纤维掺量和再生粗骨料取代率.当粉煤灰取代率在30%以内、钢纤维掺量在18%以内时,粉煤灰取代率对再生混凝土抗压强度的影响最大,其次是再生粗骨料取代率,最次是钢纤维掺量;钢纤维掺量对再生混凝土劈裂抗拉强度和抗折强度的影响最大,其次是粉煤灰取代率,最次是再生粗骨料取代率.

    Abstract:

    Orthogonal experiment method was applied to analyze the strength properties of steel fiber reinforced fly ash recycled concrete. The effect of the fly ash replacement rate, steel fiber content and recycled coarse aggregate replacement rate was investigated on the 28d cube compressive strength, splitting tensile strength and flexural strength. Test results show that the influence of fly ash replacement rate on the compressive strength is the same as on the flexural strength, but for the splitting tensile strength is not the case. Compressive strength, splitting tensile strength and flexural strength increase with the increase of steel fiber content, however, steel fiber content has significant effect on the splitting tensile strength and flexural strength, and little effect on the compressive strength. The influence of recycled coarse aggregate replacement rate on the compressive strength, the splitting tensile strength and flexural strength is the same. The strength increases with the increase of recycled coarse aggregate replacement rate. To improve recycled concrete strength, it is necessary to reduce the fly ash replacement rate, and to increase the steel fiber content and recycled coarse aggregate replacement rate. If fly ash replacement rate is below 30% and steel fiber content is below 18%, the fly ash replacement rate plays the most significant role on the compressive strength, followed by the recycled coarse aggregate replacement rate and steel fiber content. The steel fiber content plays the most significant role on the splitting tensile strength and flexural strength, followed by the fly ash replacement rate and recycled coarse aggregate replacement rate.

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张学兵,匡成钢,方志,刘湘晖,王干强,赖帅.钢纤维粉煤灰再生混凝土强度正交试验研究[J].建筑材料学报,2014,17(4):677-684

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  • 收稿日期:2013-03-29
  • 最后修改日期:2013-08-02
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  • 在线发布日期: 2014-08-28
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