肖娴,高林,刘昆雄,等.层布式陶瓷纤维混凝土的抗折性能试验研究[J].混凝土与水泥制品,2022(4):46-49. XIAO X,GAO L,LIU K X,et al.Experimental Study on Flexural Properties of Laminated Ceramic Fiber Reinforced Concrete[J].China Concrete and Cement Products,2022(4):46-49.

摘   要：采用Torrent法研究了受热温度和钢纤维掺量对高强混凝土空气渗透系数和渗透深度的影响。结果表明：常温下，在高强混凝土中分别掺入体积分数为1%和2%的钢纤维后，试件的空气渗透系数分别降低了约76%和55%；在钢纤维掺量相同的情况下，随着受热温度的升高，试件的空气渗透系数和渗透深度均增大，150 ℃之后，空气渗透系数和渗透深度的增大趋势更加显著；钢纤维的掺入能够显著提升高强混凝土的抗渗性。 Abstract: The effects of heating temperature and steel fiber content on the air permeability coefficient and penetration depth of high-strength concrete were studied by the Torrent method. The results show that the air permeability coefficients of the specimens are reduced by about 76% and 55% respectively after adding steel fibers with a volume fraction of 1% and 2% into the high-strength concrete at room temperature. In the case of the same steel fiber content, with the increase of heating temperature, the air permeability coefficient and penetration depth of the specimen both increase, and the increase trend is more significant after 150 ℃. The incorporation of steel fiber can significantly improve the impermeability of high-strength concrete.

何佳欢,韩阳,沈雷,等.高温后钢纤维增强混凝土的空气渗透性试验研究[J].混凝土与水泥制品,2022(4):50-54. HE J H,HAN Y,SHEN L,et al.Experimental Study on Air Permeability of Steel Fiber Reinforced Concrete After High Temperature[J].China Concrete and Cement Products,2022(4):50-54.

摘   要：研究了单掺、复掺玄武岩纤维和纳米SiO2对混凝土力学性能的影响，并采用扫描电子显微镜（SEM）分析了玄武岩纤维和纳米SiO2的增强机理。结果表明：单掺玄武岩纤维时，混凝土的强度得到提高，且随着玄武岩纤维长度的增加，抗折强度提高更明显；单掺纳米SiO2时，随着纳米SiO2掺量的增加，混凝土的抗压、抗折强度逐渐增大；复掺玄武岩纤维与纳米SiO2时，混凝土的抗压、抗折强度均高于两种材料分别单掺时的混凝土强度；SEM分析结果表明，纳米SiO2在混凝土中起到了填充和成核作用，同时促进了水泥水化，生成了大量C-S-H凝胶和钙矾石，这些水化产物将玄武岩纤维包裹在一起，在混凝土内部形成致密的三维网状空间结构，从而提高了混凝土的强度。 Abstract: The effects of basalt fiber and nano-SiO2 on the mechanical properties of concrete were studied, and the strengthening mechanism of basalt fiber and nano-SiO2 was analyzed by scanning electron microscope(SEM). The results show that when basalt fiber is mixed alone, the strength of concrete is improved, and as the length of basalt fiber increases, the increase in flexural strength is more obvious. When nano-SiO2 is mixed alone, the compressive strength and flexural strength of concrete increase gradually with the increase of nano-SiO2 content. The compressive strength and flexural strength of concrete mixed with basalt fiber and nano-SiO2 are higher than those of concrete when the two materials are mixed separately. SEM results show that nano-SiO2 plays a role in filling and nucleation in concrete, and promotes the hydration of cement, generating a large number of C-S-H gel and ettringite. These hydration products wrap basalt fibers together, forming a dense three-dimensional network space structure inside concrete, thus improving the strength of concrete.

黄伟,张阳阳,葛进进,等.玄武岩纤维与纳米SiO2增强混凝土力学性能研究和微观分析[J].混凝土与水泥制品,2022(4):55-58,63. HUANG W, ZHANG Y Y,GE J J,et al.Experimental Study and Microscopic Analysis of the Mechanical Properties of Basalt Fiber and Nano-SiO2 Reinforced Concrete[J].China Concrete and Cement Products,2022(4):55-58,63.