孔隙结构对玄武岩纤维混凝土力学性能的影响研究
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摘要
为探究玄武岩纤维(BF)掺量对混凝土孔隙结构的作用机制,进而影响抗压性能的规律,制作了玄武岩纤维掺量为0、1.5 kg/m~3、3.0 kg/m~3、4.5 kg/m~3、6.0 kg/m~3、7.5 kg/m~3的标准尺寸试块,进行抗压性能试验,得出不同BF掺量混凝土各龄期下的抗压强度。引入核磁共振(NMR)技术,测试不同BF掺量的混凝土孔隙分量结构。通过回归分析表明,随着纤维掺量的增加,混凝土抗压强度呈先增后减的趋势。BF掺量为3.5 kg/m~3时7 d、14 d抗压强度最大,较素混凝土分别增大6.4%和7.6%,BF掺量为3 kg/m~3时28 d抗压强度最大,较素混凝土增加14.1%。NMR试验结果显示,混凝土内部总孔隙率随着BF掺量的增大而增大,混凝土内部总孔隙率达到一定值后导致其抗压强度降低。通过分析抗压试验应力-应变曲线,得出BF混凝土抗压损规律,并对其增强机理进行了简要分析。
In order to study the and mechanism are of basalt fiber(BF) content on concrete pore structure and compressive performance, the standard size test blocks of 0, 1.5 kg/m~3, 3.0 kg/m~3, 4.5 kg/m~3, 6.0 kg/m~3, 7.5 kg/m~3 cubed were made, and the compressive strength of concrete with different BF contents at each age was obtained through the compressive performance tests. Nuclear magnetic resonance(NMR) technology was used to test the pore component structure of concrete with different BF dosage. The regression analysis shows that the compressive strength of concrete increases first and then decreases with the increase of fiber content. When BF content is 3.5 kg/m~3, the 7 d and 14 d compressive strength reach the greatest, increasing by 6.4% and 7.6% respectively compared with plain concrete. When BF content is 3 kg/m~3, the 28 d compressive strength reaches the greatest, increasing by 14.1% compared with plain concrete. The NMR test results show that the total porosity in concrete increases with the increase of the content of BF,and the compressive strength of concrete decreases when the total porosity in concrete reaches a certain value. By analyzing the stress-strain curve of compression test, the law of compression loss of BF concrete was obtained, and the strengthening mechanism was analyzed briefly.
In order to study the and mechanism are of basalt fiber(BF) content on concrete pore structure and compressive performance, the standard size test blocks of 0, 1.5 kg/m~3, 3.0 kg/m~3, 4.5 kg/m~3, 6.0 kg/m~3, 7.5 kg/m~3 cubed were made, and the compressive strength of concrete with different BF contents at each age was obtained through the compressive performance tests. Nuclear magnetic resonance(NMR) technology was used to test the pore component structure of concrete with different BF dosage. The regression analysis shows that the compressive strength of concrete increases first and then decreases with the increase of fiber content. When BF content is 3.5 kg/m~3, the 7 d and 14 d compressive strength reach the greatest, increasing by 6.4% and 7.6% respectively compared with plain concrete. When BF content is 3 kg/m~3, the 28 d compressive strength reaches the greatest, increasing by 14.1% compared with plain concrete. The NMR test results show that the total porosity in concrete increases with the increase of the content of BF,and the compressive strength of concrete decreases when the total porosity in concrete reaches a certain value. By analyzing the stress-strain curve of compression test, the law of compression loss of BF concrete was obtained, and the strengthening mechanism was analyzed briefly.
引文
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[3]吴江,李玉香,陈雅斓,等.短切玄武岩纤维增强混凝土力学性能试验研究[J].混凝土,2014(10):99-102.
[4]王钧,马跃,张野,等.短切玄武岩纤维混凝土力学性能试验与分析[J].工程力学,2014,31(S1):99-102,114.
[5]元成方,高丹盈.聚丙烯纤维混凝土高温后的孔隙结构特征研究[J].华中科技大学学报:自然科学版,2014(4):122-126.
[6]元成方,高丹盈,赵毅.聚丙烯纤维混凝土高温损伤研究[J].混凝土,2014(1):61-64.
[7]王海良,袁磊,宋浩.短切玄武岩纤维混凝土力学性能试验研究[J].建筑结构,2013,43(S2):562-564.
[8]彭苗,黄浩雄,廖清河,等.玄武岩纤维混凝土基本力学性能试验研究[J].混凝土,2012(1):74-75.
[9]张野.短切玄武岩纤维混凝土基本力学性能研究[D].哈尔滨:东北林业大学,2011.
[10]李为民,许金余,沈刘军,等.玄武岩纤维混凝土的动态力学性能[J].复合材料学报,2008(2):135-142.
[11]李淑进,赵铁军,吴科如.混凝土渗透性与微观结构关系的研究[J].混凝土与水泥制品,2004(2):6-8.
[12]刘娟红,宋少民.颗粒分布对活性粉末混凝土性能及微观结构影响[J].武汉理工大学学报,2007,29(1):26-29.
[13]薛慧君,申向东,邹春霞,等.浮石及浮石轻骨料混凝土材料研究进展[J].硅酸盐通报,2016(5):1536-1540,1546.
[14]黄大观,牛荻涛,傅强,等.玄武岩-聚丙烯混杂纤维混凝土孔结构分析[J].混凝土,2018(7):51-53.
[15]石东升,王安.矿渣细骨料混凝土孔隙结构对抗压强度的影响[J].混凝土,2016(3):80-83.