通过水泥砂浆桩无侧限抗压强度室内配比试验，研究不同水泥掺入比、不同掺砂量及不同龄期条件下水泥砂浆桩的无侧限抗压强度发展规律。试验研究表明：水泥土中掺入一定量的砂，可以明显地提高水泥砂浆桩的无侧限抗压强度。水泥掺入比相...通过水泥砂浆桩无侧限抗压强度室内配比试验，研究不同水泥掺入比、不同掺砂量及不同龄期条件下水泥砂浆桩的无侧限抗压强度发展规律。试验研究表明：水泥土中掺入一定量的砂，可以明显地提高水泥砂浆桩的无侧限抗压强度。水泥掺入比相同时，28 d 龄期的水泥砂浆桩的无侧限抗压强度为水泥土的2．2～3．7倍；水泥砂浆桩的无侧限抗压强度随着掺砂量的增加而增大，当掺砂量达到30％以后，强度随着掺砂量的增大而减小。水泥砂浆桩无侧限抗压强度随着水泥掺入比的增大而增大，随着养护龄期的增长而增大，其中前期的强度增长速率较快，后期较慢。水泥掺入比低、掺砂量低、龄期短的试件试件呈现塑性破坏，水泥掺入比高、掺砂量高、龄期长的呈现脆性破坏。本文的研究成果可为工程应用提供试验数据和理论依据。展开更多
The relation between the methylene blue （MB） value of MS and its limestone powder content and clay content was investigated. The effects of MB values ranging from 0.35 to 2.5 on the workability of fresh concrete, th...The relation between the methylene blue （MB） value of MS and its limestone powder content and clay content was investigated. The effects of MB values ranging from 0.35 to 2.5 on the workability of fresh concrete, the mechanical properties, the resistance to freezing as well as the resistance to chlorine ion permeation of the hardened concrete were all investigated. The experimental results showed that the MB value had no correlation with the limestone powder content of MS, while it was directly related to the clay content. With an increase of MB value, concrete workability decreased, as did the flexural and 7-day compressive strengths, however, the 28-day compressive strength was not affected. Furthermore, influence of MB value on concretes of different strength levels was different. For low-strength concretes, an increase of MB value could improve its impermeability, but this was not the case for high-strength concretes. Instead, their resistance to chloride ion permeability decreased slightly. However, even a slight increase in MB value remarkably accelerated freeze-thaw damage of MS concrete. It was thus concluded that the critical MB value of 1.4 would not cause significant deterioration in the performance of MS concretes.展开更多
文摘通过水泥砂浆桩无侧限抗压强度室内配比试验，研究不同水泥掺入比、不同掺砂量及不同龄期条件下水泥砂浆桩的无侧限抗压强度发展规律。试验研究表明：水泥土中掺入一定量的砂，可以明显地提高水泥砂浆桩的无侧限抗压强度。水泥掺入比相同时，28 d 龄期的水泥砂浆桩的无侧限抗压强度为水泥土的2．2～3．7倍；水泥砂浆桩的无侧限抗压强度随着掺砂量的增加而增大，当掺砂量达到30％以后，强度随着掺砂量的增大而减小。水泥砂浆桩无侧限抗压强度随着水泥掺入比的增大而增大，随着养护龄期的增长而增大，其中前期的强度增长速率较快，后期较慢。水泥掺入比低、掺砂量低、龄期短的试件试件呈现塑性破坏，水泥掺入比高、掺砂量高、龄期长的呈现脆性破坏。本文的研究成果可为工程应用提供试验数据和理论依据。
基金Funded by the National West Communication Construction Technology Project(No.200731822301-6)
文摘The relation between the methylene blue （MB） value of MS and its limestone powder content and clay content was investigated. The effects of MB values ranging from 0.35 to 2.5 on the workability of fresh concrete, the mechanical properties, the resistance to freezing as well as the resistance to chlorine ion permeation of the hardened concrete were all investigated. The experimental results showed that the MB value had no correlation with the limestone powder content of MS, while it was directly related to the clay content. With an increase of MB value, concrete workability decreased, as did the flexural and 7-day compressive strengths, however, the 28-day compressive strength was not affected. Furthermore, influence of MB value on concretes of different strength levels was different. For low-strength concretes, an increase of MB value could improve its impermeability, but this was not the case for high-strength concretes. Instead, their resistance to chloride ion permeability decreased slightly. However, even a slight increase in MB value remarkably accelerated freeze-thaw damage of MS concrete. It was thus concluded that the critical MB value of 1.4 would not cause significant deterioration in the performance of MS concretes.
