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发布时间:2020-01-06 00:00:00
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纤维水泥及制品

粉煤灰与稻草纤维复掺对混凝土力学性能的 影响
粉煤灰与稻草纤维复掺对混凝土力学性能的 影响
  • 刘 涛,赵明皓,聂国豪,韩龙宇,林 锋,巫绪涛
2021年第11期
摘要
引用本文
摘   要:研究了丝状、杆状稻草纤维分别与粉煤灰复掺对混凝土力学性能的影响。结果表明:随着稻草纤维和粉煤灰掺量的增加,混凝土的抗压强度、劈裂抗拉强度和抗折强度总体呈下降趋势,但稻草纤维能够有效改善混凝土的脆性破坏形态;丝状稻草纤维对混凝土性能的不利影响小于杆状稻草纤维;当丝状稻草纤维掺量为0.3%、粉煤灰掺量为20%时,混凝土的抗压强度较高;当丝状稻草纤维掺量为0.3%、粉煤灰掺量为10%时,混凝土的劈裂抗拉强度较高;当丝状稻草纤维掺量为0.3%、粉煤灰掺量为20%时,混凝土的抗折强度较高。 Abstract: The effects of filamentary straw fiber and rod-shaped straw fiber and fly ash on mechanical properties of concrete were studied. The results show that the compressive strength, splitting tensile strength and flexural strength of concrete generally decrease with the increase of straw fiber content and fly ash content, but straw fiber can effectively improve the brittle damage pattern of concrete. The adverse effect of filamentous straw fiber on the performance of concrete is less than that of rod-shaped straw fiber. The compressive strength of the concrete is higher when the filamentary straw fiber content is 0.3% and the fly ash content is 20%. The splitting tensile strength of the concrete is higher when the filamentary straw fiber content is 0.3% and the fly ash content is 10%. The flexural strength of the concrete is higher when the filamentary straw fiber content is 0.3% and the fly ash content is 20%.
刘涛,赵明皓,聂国豪,等.粉煤灰与稻草纤维复掺对混凝土力学性能的影响[J].混凝土与水泥制品,2021(11):64-67,72. LIU T,ZHAO M H,NIE G H.Study on the Mechanical Properties of Fly Ash and Straw Fiber Composite Concrete[J].China Concrete and Cement Products,2021(11):64-67,72.
CFRP编织管约束混凝土短柱轴压性能试验研究
CFRP编织管约束混凝土短柱轴压性能试验研究
  • 张浩龙,王文昊,徐 迎,王 鹏,孙大威,吴建钦
2021年第11期
摘要
引用本文
摘   要:通过21根碳纤维增强复合材料(CFRP)编织管约束混凝土短柱的准静态轴压试验,研究了CFRP层数、水灰比、试件长径比对混凝土短柱抗压强度和变形性能的影响。结果表明:CFRP编织管约束试件的承载力相比素混凝土试件至少提高了10%;水灰比在一定范围内变化时,对试验结果的影响不大;试件长径比越小,CFRP对最大荷载的提升作用越明显。 Abstract: Through the quasi-static axial compression tests of concrete short columns confined by 21 carbon fiber reinforced composite material(CFRP) braided tubes, the effects of the number of CFRP layer, water-cement ratio, and length-diameter ratio of specimen on the compressive strength and deformation characteristics of concrete short columns were studied. The results show that the bearing capacity of the CFRP tube confined column is at least 10% higher than that of the plain concrete column. The water-cement ratio has little effect on the test results within a certain range. The smaller the length-diameter ratio of the column, the more obvious the increase in the maximum load by CFRP.
张浩龙,王文昊,徐迎,等.CFRP编织管约束混凝土短柱轴压性能试验研究[J].混凝土与水泥制品,2021(11):59-63. ZHANG H L,WANG W H,XU Y,et al.Experimental Study on the Axial Compression Performance of Concrete Short Columns Confined by CFRP Braided Tubes[J].China Concrete and Cement Products,2021(11):59-63.
纤维分布对聚合物水泥混凝土力学性能的影响研究
纤维分布对聚合物水泥混凝土力学性能的影响研究
  • 赵继忠1,史玉良2,李鑫磊1,徐 雨1
2021年第11期
摘要
引用本文
摘  要:通过三组不同纤维体积掺量(0.1%、0.2%、0.3%)的玄武岩纤维增强聚合物混凝土(BFRPC)抗压强度试验,研究了纤维分布对BFRPC抗压强度的影响。利用计算机扫描技术和数字图像处理技术(DIP),从微观上分析了玄武岩纤维(BF)对聚合物混凝土性能的增强机理。结果表明:BF的最佳体积掺量为0.2%,此时BF分布均匀,BFRPC的抗压强度达到了50.10 MPa,纤维接触率达到了61.0%;当BF体积掺量增至0.3%时,BFRPC的抗压强度为46.52 MPa,纤维接触率为82.9%,虽然抗压强度有所下降,但仍高于普通混凝土的抗压强度,且纤维接触率增大,说明此时BF的增韧阻裂效果大于BF结团对BFRPC力学性能的影响。 Abstract: Through three groups of compressive strength tests of basalt fiber reinforced polymer concrete (BFRPC) with different fiber volume content(0.1%, 0.2%, 0.3%), the effect of fiber distribution on compressive strength of BFRPC was studied. Using computer scanning technology and digital image processing technology(DIP), the strengthening mechanism of basalt fiber(BF) on the properties of polymer concrete was analyzed microscopically. The results show that the optimum volume content of BF is 0.2%, and the BF distribution is uniform at this time, the compressive strength of BFRPC reaches 50.10 MPa and the fiber contact rate reaches 61.0%. When the volume content of BF increases to 0.3%, the compressive strength of BFRPC is 46.52 MPa and the fiber contact rate is 82.9%. Although the compressive strength decreases, it is still higher than that of ordinary concrete, and the fiber contact rate increases, which indicates that the toughening and crack resistance effect of BF is greater than that of BF agglomeration on the mechanical properties of BFRPC.
赵继忠,史玉良,李鑫磊,等.纤维分布对聚合物水泥混凝土力学性能的影响研究[J].混凝土与水泥制品,2021(11):55-58,72. ZHAO J Z,SHI Y L,LI X L,et al.Study on the Influence of Fiber Distribution on Mechanical Properties of Polymer Cement Concrete[J].China Concrete and Cement Products,2021(11):55-58,72.
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