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3D打印超高性能混凝土的抗渗及抗冻性能研究
Impermeability and Frost Resistance of 3D Printed Ultra-high Performance Concrete
2022年第10期
3D打印混凝土;抗冻性;抗渗性;超高性能混凝土;钢纤维;相对动弹性模量
3D printed concrete; Frost resistance; Impermeability; Ultra-high performance concrete(UHPC); Steel fiber; Relative dynamic elastic modulus
2022年第10期
10.19761/j.1000-4637.2022.10.001.06
国家自然科学基金项目(52078253、51678308)。
吴 凯1,赖建中1,2,杜龙雨1,周捷航1,董赛阳1,邱士扬2
1.南京理工大学,江苏 南京 210094;2.南京啄春泥智能科技有限公司,江苏 南京 210000

吴 凯1,赖建中1,2,杜龙雨1,周捷航1,董赛阳1,邱士扬2

吴凯,赖建中,杜龙雨,等.3D打印超高性能混凝土的抗渗及抗冻性能研究[J].混凝土与水泥制品,2022(10):1-6.

WU K,LAI J Z,DU L Y,et al.Impermeability and Frost Resistance of 3D Printed Ultra-high Performance Concrete[J].China Concrete and Cement Products,2022(10):1-6.

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摘   要:设计了一种基于超高性能混凝土配合比的3D打印材料,研究了3D打印混凝土试件和浇筑试件的抗渗性能和抗冻性能。结果表明,用该配合比配制的3D打印混凝土试件和浇筑试件均具有良好的抗渗性能和抗冻性能,试件均能在1.4 MPa水压力下保持不渗水,300次冻融循环后保持较高的力学性能和相对动弹性模量,且3D打印试件测试结果更好。为增强结构密实度,混凝土原材料添加了钢纤维,通过CT扫描发现,3D打印试件结构更加紧密,内部缺陷较少,受到冻融破坏时能保持较完整的结构。 Abstract: A 3D printed material based on the ultra-high performance concrete mix proportion was designed. 3D printed specimens and casted specimens were prepared to study their impermeability and frost resistance. The results show that these concrete specimens with ultra-high performance concrete mix proportion have good impermeability and frost resistance. The experimental specimens can maintain impermeability under 1.4 MPa water pressure, and maintain great mechanical properties and relative dynamic elastic modulus after 300 freeze-thaw cycles, and the test results of 3D printed specimens are better. CT scan analysis reveals that the structure of 3D printed concrete is denser. The addition of steel fibers can improve the compactness of the structure when freeze-thaw damage occurrs. Thus, 3D printed specimens have better comprehensive performance due to fewer internal defects.
英文名 : Impermeability and Frost Resistance of 3D Printed Ultra-high Performance Concrete
刊期 : 2022年第10期
关键词 : 3D打印混凝土;抗冻性;抗渗性;超高性能混凝土;钢纤维;相对动弹性模量
Key words : 3D printed concrete; Frost resistance; Impermeability; Ultra-high performance concrete(UHPC); Steel fiber; Relative dynamic elastic modulus
刊期 : 2022年第10期
DOI : 10.19761/j.1000-4637.2022.10.001.06
文章编号 :
基金项目 : 国家自然科学基金项目(52078253、51678308)。
作者 : 吴 凯1,赖建中1,2,杜龙雨1,周捷航1,董赛阳1,邱士扬2
单位 : 1.南京理工大学,江苏 南京 210094;2.南京啄春泥智能科技有限公司,江苏 南京 210000

吴 凯1,赖建中1,2,杜龙雨1,周捷航1,董赛阳1,邱士扬2

吴凯,赖建中,杜龙雨,等.3D打印超高性能混凝土的抗渗及抗冻性能研究[J].混凝土与水泥制品,2022(10):1-6.

WU K,LAI J Z,DU L Y,et al.Impermeability and Frost Resistance of 3D Printed Ultra-high Performance Concrete[J].China Concrete and Cement Products,2022(10):1-6.

摘要
参数
结论
参考文献
引用本文

摘   要:设计了一种基于超高性能混凝土配合比的3D打印材料,研究了3D打印混凝土试件和浇筑试件的抗渗性能和抗冻性能。结果表明,用该配合比配制的3D打印混凝土试件和浇筑试件均具有良好的抗渗性能和抗冻性能,试件均能在1.4 MPa水压力下保持不渗水,300次冻融循环后保持较高的力学性能和相对动弹性模量,且3D打印试件测试结果更好。为增强结构密实度,混凝土原材料添加了钢纤维,通过CT扫描发现,3D打印试件结构更加紧密,内部缺陷较少,受到冻融破坏时能保持较完整的结构。

Abstract: A 3D printed material based on the ultra-high performance concrete mix proportion was designed. 3D printed specimens and casted specimens were prepared to study their impermeability and frost resistance. The results show that these concrete specimens with ultra-high performance concrete mix proportion have good impermeability and frost resistance. The experimental specimens can maintain impermeability under 1.4 MPa water pressure, and maintain great mechanical properties and relative dynamic elastic modulus after 300 freeze-thaw cycles, and the test results of 3D printed specimens are better. CT scan analysis reveals that the structure of 3D printed concrete is denser. The addition of steel fibers can improve the compactness of the structure when freeze-thaw damage occurrs. Thus, 3D printed specimens have better comprehensive performance due to fewer internal defects.

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(1)所有超高性能混凝土试件都具有较好的抗渗性,且在同为S2配合比条件下,3D打印混凝土试件的抗渗性优于浇筑混凝土试件。
(2)3D打印混凝土试件的抗冻性更好,掺入钢纤维的试件具有更佳的抗冻性和抗压强度。
(3)浇筑试件孔隙率在4.0%左右,而3D打印试件的孔隙率在0.6%左右。
(4)浇筑试件表面气孔较多较大,易与空气接触,气孔周边的钢纤维锈蚀严重;而打印试件表面气孔很少,钢纤维仍充满光泽,无明显锈蚀,试件性能保持良好。

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吴凯,赖建中,杜龙雨,.3D打印超高性能混凝土的抗渗及抗冻性能研究[J].混凝土与水泥制品,2022(10):1-6.

WU K,LAI J Z,DU L Y,et al.Impermeability and Frost Resistance of 3D Printed Ultra-high Performance Concrete[J].China Concrete and Cement Products,2022(10):1-6.

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