苏州混凝土水泥制品研究院有限公司

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发布时间:2020-01-06 00:00:00
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纤维材料及制品

含粗骨料UHPC的强度尺寸效应与性能研究
含粗骨料UHPC的强度尺寸效应与性能研究
  • 王 军,刘晓峰,陈镇衫,罗 西,余 辉,廖树基
2024年第5期
摘要
引用本文
摘   要:研究了胶凝材料组成比例、钢纤维类型(平直型、端钩型)对含粗骨料超高性能混凝土(UHPC)强度尺寸效应、工作性和收缩性能的影响,分析了减缩剂掺量(0~2.0%)对含粗骨料UHPC收缩性能、力学性能、抗氯离子渗透性能和孔结构的影响。结果表明:适当增加粉煤灰掺量有利于改善含粗骨料UHPC的工作性,降低收缩;掺入钢纤维降低了含粗骨料UHPC的工作性,但抑制了收缩,且端钩型钢纤维抑制效果更显著;掺入1%钢纤维能够有效降低含粗骨料UHPC的强度尺寸效应,且平直型钢纤维的降低效果更好;掺入减缩剂明显降低了含粗骨料UHPC的收缩,但会使抗压强度降低,总孔隙率增大,抗氯离子渗透性能变差。 Abstract: The effects of the composition ratio of cementitious materials and the type of steel fibers (straight and end-hooked) on the strength size effect, workablity and shrinkage properties of ultra-high performance concrete (UHPC) with coarse aggregates were investigated, and the effects of the content of shrinkage reducing agent (0~2.0%) on the shrinkage properties, mechanical properties, chloride ion penetration resistance and pore structure of UHPC with coarse aggregates were analyzed. The results show that increasing the content of fly ash appropriately is conducive to improving the workability and reducing the shrinkage of UHPC with coarse aggregates. The addition of steel fibers reduces the workability of UHPC with coarse aggregates, but inhibits the shrinkage, and the suppression effect is more significant with end-hooked steel fibers. Adding 1% content of steel fibers effectively reduces the strength size effect of UHPC with coarse aggregates, and the reduction effect of the straight steel fibers is better. The addition of shrinkage reducing agent obviously reduces the shrinkage of UHPC with coarse aggregates, but reduces the compressive strength, increases the total porosity, and deteriorates the chloride ion penetration resistance.
王军,刘晓峰,陈镇衫,等.含粗骨料UHPC的强度尺寸效应与性能研究[J].混凝土与水泥制品,2024(5):51-56. WANG J,LIU X F,CHEN Z S,et al.Study on strength size effect and performance of UHPC with coarse aggregates[J].China Concrete and Cement Products,2024(5):51-56.
玄武岩纤维混凝土抗压性能与韧性试验研究
玄武岩纤维混凝土抗压性能与韧性试验研究
  • 吴秋祺1,张 军2,徐怀江2,于志龙3,曾强忠3,张长杰3,黄亚进3,李家伟1,*
2024年第5期
摘要
引用本文
摘   要:为探索玄武岩纤维(BF)对混凝土力学性能的影响,以BF的长度(12、18、24 mm)和体积掺量(0.1%、0.2%、0.3%)为变量,研究了玄武岩混凝土的抗压性能与韧性,分析了BF对混凝土韧性改善的作用机理。结果表明:随着BF长度和掺量的增加,试件的抗压强度均先增大后减小,但差距不大,最佳BF长度和掺量分别为18 mm和0.1%;BF对混凝土变形能力与韧性的提升效果明显,BF的最佳长度为18 mm、掺量为0.2%,BF的掺入对混凝土峰值荷载前的韧性提升比峰值荷载后更明显。 Abstract: In order to explore the effects of basalt fiber (BF) on the mechanical performance of concrete, taking the length(12、18、24 mm) and content(0.1%、0.2%、0.3%) of BF as variables, the compressive performance and toughness of basalt fiber reinforced concrete were studied, and the mechanism of BF on the improvement of the toughness of basalt fiber reinforced concrete was analyzed. The results show that with the increase of the length and content of BF, the compressive strength of the specimen first increases and then decreases, but the difference is small, and the optimal length and content of BF are 18 mm and 0.1%, respectively. The effect of BF on the improvement of concrete deformability and toughness is obvious, and the optimal length of BF is 18 mm, and the content is 0.2%. The effect of BF on the improvement of toughness of concrete before peak loads are more pronounced than that after peak loads.
吴秋祺,张军,徐怀江,等.玄武岩纤维混凝土抗压性能与韧性试验研究[J].混凝土与水泥制品,2024(5):57-60. WU Q Q,ZHANG J,XU H J,et al.Experimental study on compression performance and toughness of basalt fiber reinforced concrete[J].China Concrete and Cement Products,2024(5):57-60.
盐冻作用下玄武岩纤维混凝土性能劣化研究
盐冻作用下玄武岩纤维混凝土性能劣化研究
  • 杨立勇
2024年第5期
摘要
引用本文
摘   要:针对北方地区温度较低时撒除冰盐对混凝土造成的盐冻破坏问题,研究了盐冻作用下玄武岩纤维(BF)的体积掺量(0~0.20%)对混凝土力学性能、断裂韧性的影响。结果表明:盐冻作用下,掺BF试件的单位面积质量损失和动弹性模量损失均比未掺BF试件的低;掺入适量BF提高了混凝土的抗压强度、抗弯强度及断裂韧性,BF的最佳掺量为0.12%。 Abstract: In order to solve the problem of salt freezing damage to concrete caused by spreading deicing salt under the low temperature environment in the northern region, the effect of volume content(0~0.20%) of basalt fiber(BF) on the mechanical properties and fracture toughness of concrete under the action of salt freezing was investigated. The results show that under the action of salt freezing, the mass loss of per unit area and loss of dynamic elastic modulus of the specimen with BF are lower than those of the specimen without BF. Adding appropriate content of BF improves the compressive strength, bending strength and fracture toughness of concrete, and the optimum content of BF is 0.12%.
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