The influences of compositing mineral admixtures on the regularity of mechanical property, workability, durability and microstructure of C50 marine concrete were investigated. The results show that the incorporation o...The influences of compositing mineral admixtures on the regularity of mechanical property, workability, durability and microstructure of C50 marine concrete were investigated. The results show that the incorporation of mineral admixtures can improve the mechanical properties and workability of C50 marine concrete, 3 min-doped mineral admixture had excellent resistance to chloride ion permeability. The microscopic structure mixing mineral admixtures system was well-distributed and compact, little macroporeare can be found.展开更多
为研究海洋桩基与附近土体的界面力学特性,进行了不同法向应力、土体含水率与压缩度下的混凝土-海洋黏土界面剪切试验,并通过PFC^(2D)离散元方法分析了海洋桩基附近土体剪切带随时间的变化情况。结果表明:压缩量-法向应力曲线符合“双...为研究海洋桩基与附近土体的界面力学特性,进行了不同法向应力、土体含水率与压缩度下的混凝土-海洋黏土界面剪切试验,并通过PFC^(2D)离散元方法分析了海洋桩基附近土体剪切带随时间的变化情况。结果表明:压缩量-法向应力曲线符合“双曲线”关系。土体的压缩度随含水率、法向应力的增大而增大,在达到相同的压缩度下,含水率越高或受法向应力越大的土体所用的压缩时间越短。峰值剪切应力随法向应力、压缩度的增大而增大,随含水率的增大而减小。降低土体压缩度或调整土体含水率至塑限附近可提高界面抗剪强度。含水率、法向应力越大,土体的剪缩特性越明显;压缩度越大,土体的剪胀特性越明显。土体剪切带面积随剪切时间先急剧增加,后逐渐减小至稳定值1.13 cm 2左右。压缩度越大,土体剪切带面积越大,但达到峰值剪切带面积所用时间基本相同。含水率越低,土体剪切带面积越大,峰值剪切带面积与剪切时间成正比例。展开更多
基金Funded by the Science Foundation of the Science and Technology Department of Hubei Province (No.2004ABA100)
文摘The influences of compositing mineral admixtures on the regularity of mechanical property, workability, durability and microstructure of C50 marine concrete were investigated. The results show that the incorporation of mineral admixtures can improve the mechanical properties and workability of C50 marine concrete, 3 min-doped mineral admixture had excellent resistance to chloride ion permeability. The microscopic structure mixing mineral admixtures system was well-distributed and compact, little macroporeare can be found.
文摘为研究海洋桩基与附近土体的界面力学特性,进行了不同法向应力、土体含水率与压缩度下的混凝土-海洋黏土界面剪切试验,并通过PFC^(2D)离散元方法分析了海洋桩基附近土体剪切带随时间的变化情况。结果表明:压缩量-法向应力曲线符合“双曲线”关系。土体的压缩度随含水率、法向应力的增大而增大,在达到相同的压缩度下,含水率越高或受法向应力越大的土体所用的压缩时间越短。峰值剪切应力随法向应力、压缩度的增大而增大,随含水率的增大而减小。降低土体压缩度或调整土体含水率至塑限附近可提高界面抗剪强度。含水率、法向应力越大,土体的剪缩特性越明显;压缩度越大,土体的剪胀特性越明显。土体剪切带面积随剪切时间先急剧增加,后逐渐减小至稳定值1.13 cm 2左右。压缩度越大,土体剪切带面积越大,但达到峰值剪切带面积所用时间基本相同。含水率越低,土体剪切带面积越大,峰值剪切带面积与剪切时间成正比例。
