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

PVA-钢纤维自密实混凝土早期干燥收缩研究
PVA-钢纤维自密实混凝土早期干燥收缩研究
  • 余建杰1,翟嘉欣2,*,郑 琪1,董建军1
2024年第6期
摘要
引用本文
摘   要:研究了钢纤维、PVA纤维、PVA-钢混杂纤维对自密实混凝土早期干燥收缩的影响。结果表明:纤维的掺入不会改变自密实混凝土干燥收缩的发展趋势;单掺钢纤维或PVA纤维均能抑制自密实混凝土的干燥收缩,其中,PVA纤维较钢纤维对自密实混凝土干燥收缩的抑制效果更好,但纤维体积掺量过高则会导致纤维的抑制效果减弱;PVA-钢混杂纤维对自密实混凝土干燥收缩的改善效果优于单一纤维,其中,0.3%体积掺量的钢纤维与0.06%体积掺量的PVA纤维混杂对自密实混凝土干燥收缩的改善效果相对最好,表现出显著的混杂效应。 Abstract: The effects of steel fiber, PVA fiber and PVA-steel hybrid fiber on the early-age drying shrinkage of self-compacting concrete were studied. The results show that the incorporation of fiber will not change the trend of drying shrinkage of self-compacting concrete. The drying shrinkage of self-compacting concrete can be inhibited by mixing steel fiber or PVA fiber. Among which, PVA fiber has a better inhibition effect on the drying shrinkage of self-compacting concrete than that of steel fiber, but the inhibition effect of fiber is weakened by too much fiber volume content. The improved effect of PVA-steel hybrid fiber on drying shrinkage of self-compacting concrete is better than that of single fiber. Among which, mixing 0.3% volume content of steel fiber and 0.06% volume content of PVA fiber shows relatively the best improvement on drying shrinkage of self-compacting concrete, showing a significant hybrid effect.
余建杰,翟嘉欣,郑琪,等.PVA-钢纤维自密实混凝土早期干燥收缩研究[J].混凝土与水泥制品,2024(6):55-58,63. YU J J,ZHAI J X,ZHENG Q,et al.Study on early-age drying shrinkage of PVA-steel fiber reinforced self-compacting concrete[J].China Concrete and Cement Products,2024(6):55-58,63.
粗骨料对超高性能应变硬化水泥基复合材料(UHP-SHCC)性能的影响
粗骨料对超高性能应变硬化水泥基复合材料(UHP-SHCC)性能的影响
  • 丁 宏1,2,张 贵3,石小磊3,朋改非3,米应花2
2024年第6期
摘要
引用本文
摘   要:根据超高性能混凝土(UHPC)的制备理论和应变硬化水泥基复合材料(SHCC)的设计原理,制备了超高性能应变硬化水泥基复合材料(UHP-SHCC),研究了钢纤维改性处理和粗骨料的级配(最大粒径分别为6.00、8.00、9.75 mm)与掺量(0、5%、11%、15%)对UHP-SHCC抗压强度和拉伸行为的影响。结果表明:与未改性钢纤维相比,改性钢纤维使UHP-SHCC的应变硬化行为更明显;通过合理调控粗骨料的级配和掺量,有效提高了UHP-SHCC的抗压强度,改善了UHP-SHCC的拉伸应变硬化效果,但随着龄期从7 d增至28 d,UHP-SHCC的应变硬化效果略有减弱。 Abstract: Based on the preparation theory of ultra-high performance concrete(UHPC) and the design principle of strain-hardening cement-based composite(SHCC), the ultra-high performance-strain hardening cementitious composite(UHP-SHCC) was prepared. The effects of steel fiber modification treatment, and the gradation(maximum particle size of 6.00, 8.00, 9.75 mm) and content(0, 5%, 11%, 15%) of coarse aggregates on the compressive strength and tensile behavior of UHP-SHCC were studied. The results show that, compared with unmodified steel fibers, modified steel fibers make the strain hardening behavior of UHP-SHCC more pronounced. By reasonably adjusting the gradation and content of coarse aggregates, the compressive strength and the tensile strain hardening effect of UHP-SHCC can be effectively improved. However, as the age increases from 7 d to 28 d, the strain hardening effect of UHP-SHCC slightly weakens.
丁宏,张贵,石小磊,等.粗骨料对超高性能应变硬化水泥基复合材料(UHP-SHCC)性能的影响[J].混凝土与水泥制品,2024(6):59-63. DING H,ZHANG G,SHI X L,et al.Influence of coarse aggregates on properties of ultra-high performance-strain hardening cementitious composites(UHP-SHCC)[J].China Concrete and Cement Products,2024(6):59-63.
ECC-既有混凝土界面黏结性能研究
ECC-既有混凝土界面黏结性能研究
  • 杨少伟1,2,刘孜睿2,杜 义2,赵爱宁2
2024年第6期
摘要
引用本文
摘   要:利用工程水泥基复合材料(ECC)对混凝土结构进行维修和加固时,新旧材料的界面黏结强度至关重要。研究了不同养护条件(标准养护、20 ℃水养、-10 ℃自然养护、40 ℃自然养护)下,涂刷界面剂[乙酸乙烯酯(VA)、乙酸乙烯酯-乙烯(VAE)、乙酸乙烯酯-叔碳酸乙烯酯(VA/VeoVa)]对ECC-既有混凝土界面黏结性能的影响,并在标准养护条件下,对比分析了涂刷VA/VeoVa、凿毛、凿毛+涂刷VA/VeoVa对ECC-既有混凝土界面黏结性能的影响。结果表明:与VA、EVA相比,VA/VeoVa在各养护条件下均能有效提高试件的拉伸黏结强度;标准养护条件下,凿毛+涂刷VA/VeoVa对试件拉伸黏结强度的提高效果最好,其次是凿毛,最后是涂刷VA/VeoVa。 Abstract:The interfacial bond strength of the new and old materials is crucial for the repair and reinforcement of concrete structures using engineered cementitious composites (ECC). The effects of brushing interfacial agents [vinyl acetate (VA), vinyl acetate-ethylene (VAE), vinyl acetate-tertiary vinyl carbonate (VA/VeoVa)] on the bonding property of the ECC-existing concrete interface were investigated under different curing conditions (standard curing, water curing at 20 ℃, natural curing at -10 ℃, and natural curing at 40 ℃). The effects of brushing VA/VeoVa, chiseling, chiseling+brushing VA/VeoVa on the bonding property of ECC-existing concrete interface were comparatively analyzed under standard curing conditions. The results show that VA/VeoVa is effective in improving the tensile bond strength of the specimens under all curing conditions compared with VA and EVA. Under standard curing conditions, chiseling + brushing VA/VeoVa has the best effect on improving the tensile bond strength of the specimens, followed by chiseling, and lastly, brushing VA/VeoVa.
杨少伟,刘孜睿,杜义,等.ECC-既有混凝土界面黏结性能研究[J].混凝土与水泥制品,2024(6):64-67. YANG S W,LIU Z R,DU Y,et al.Study on the bonding performance of the interface between ECC and existing concrete[J].China Concrete and Cement Products,2024(6):64-67.
钢纤维增强聚合物水泥砂浆性能研究
钢纤维增强聚合物水泥砂浆性能研究
  • 谈峰玲1,吕 淼2,*,周 浩2,汪 毅2
2024年第6期
摘要
引用本文
摘   要:研究了钢纤维的体积掺量(0、0.5%、1.0%、1.5%、2.0%)对聚合物水泥砂浆力学性能和韧性的影响,并进行了性价比评价。结果表明:随着钢纤维掺量的增加,试件的7 d和28 d抗折、抗压强度基本均呈先增大后减小的趋势,最佳掺量为1.5%,此时,试件的韧性得到显著提升,性价比也达到最高。 Abstract: The effects of the volume content of steel fibers(0, 0.5%, 1.0%, 1.5%, 2.0%) on the mechanical properties and toughness of polymer cement mortar were studied, and the cost performance evaluation was conducted. The results show that with the increase of steel fiber content, the flexural and compressive strength of the specimens at 7 d and 28 d basically show a trend of first increasing and then decreasing, and the optimal content is 1.5%. Besides, the toughness of the specimens is significantly improved, and the cost performance is also the highest.
谈峰玲,吕淼,周浩,等.钢纤维增强聚合物水泥砂浆性能研究[J].混凝土与水泥制品,2024(6):68-71. TAN F L,LYU M,ZHOU H,et al.Research on performance of steel fiber reinforced polymer cement mortar[J].China Concrete and Cement Products,2024(6):68-71.
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