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发布时间:2020-01-06 00:00:00
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纤维水泥及制品

高温后玄武岩纤维混凝土力学性能试验研究
高温后玄武岩纤维混凝土力学性能试验研究
  • 李 曈1,张晓东1,刘华新1,陈 明2,范锦泽1,陈 晨1
2020年第10期
摘要
引用本文
摘   要:研究了高温作用下素混凝土、玄武岩纤维混凝土、玄武岩-高吸水树脂混凝土及玄武岩-纤维素混杂纤维混凝土的力学性能,建立了高温作用后混凝土的抗压强度预测模型。结果表明:纤维的掺入能够提高混凝土的耐高温性能;对于抗压强度,玄武岩-纤维素混杂纤维混凝土的抗压强度值最高,400 ℃时,其抗压强度相较素混凝土提高了36.3%;对于抗折强度,玄武岩和高吸水树脂混掺对混凝土抗折强度的提升效果最优;建立的高温作用下混凝土抗压强度预测模型的精度较高。 Abstract: The mechanical properties of plain concrete, basalt fiber concrete, basalt-superabsorbent resin concrete and basalt-cellulose hybrid fiber concrete after high temperature were studied, and the prediction models of compressive strength of concrete after high temperature were established. The results show that the addition of fiber can effectively improve the high temperature resistance of concrete. For compressive strength, the basalt-cellulose hybrid fiber concrete has the highest compressive strength, and at 400 ℃, its compressive strength is 36.3% higher than that of plain concrete. For flexural strength, the mixing of basalt and superabsorbent resin has the best effect on the improvement of the flexural strength of concrete. The established prediction models of compressive strength of concrete under high temperature have high accuracy.
李曈,张晓东,刘华新,等.高温后玄武岩纤维混凝土力学性能试验研究[J].混凝土与水泥制品,2020(10):61-64. LI T,ZHANG X D,LIU H X,et al.Experimental Study on Mechanical Properties of Basalt Fiber Concrete After High Temperature[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):61-64.
RPC本构关系及矩形RPC梁抗弯承载力研究
RPC本构关系及矩形RPC梁抗弯承载力研究
  • 龙佩恒,黄琳艺,乔 宏,宋 浩,李 飞
2020年第10期
摘要
引用本文
摘   要:设计了3组不同配比活性粉末混凝土(RPC)试件,研究了钢纤维对RPC试件力学性能的影响,分析了RPC抗压本构关系,并提出了新的RPC抗拉本构方程。在此基础上设计了矩形梁抗弯承载力试验,研究了钢纤维对RPC梁的延性、韧性、承载力和抗裂性能的影响。结果表明:掺钢纤维RPC梁的开裂荷载、屈服荷载及极限承载力较未掺钢纤维RPC梁均提升了20%以上,构件的裂缝宽度能够控制在0.1 mm以内。 Abstract: 3 groups of reactive powder concrete(RPC) specimens with different mix proportions were designed, the influence of steel fiber on the mechanical properties of RPC specimens was studied, the compressive constitutive relationship of RPC was analyzed, and a new RPC tensile constitutive equation was put forward. On this basis, a rectangular beam flexural bearing capacity test was designed, and the influence of steel fiber on the ductility, toughness, bearing capacity and anti-cracking performance of RPC beams was studied. The results show that the crack load、 yield load and ultimate flexural capacity of RPC beams with steel fiber are increased by more than 20% compared with RPC beams without steel fiber, and the crack width of the members can be controlled to less than 0.1 mm.
龙佩恒,黄琳艺,乔宏,等.RPC本构关系及矩形RPC梁抗弯承载力研究[J].混凝土与水泥制品,2020(10):55-60. LONG P H,HUANG L Y,QIAO H,et al.RPC Constitutive Relation and Ultimate Flexural Capacity of Rectangular RPC Beams[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):55-60.
超高强钢筋ECC柱轴心受压试验研究
超高强钢筋ECC柱轴心受压试验研究
  • 汪知文1,李碧雄1,游 杨1,廖 桥1,饶 丹2,余 弦2
2020年第10期
摘要
引用本文
摘   要:对超高强钢筋HRB500与高延性水泥基复合材料(ECC)矩形截面短柱进行了轴心受压试验,研究了配筋率为1.13%、2.26%的超高强钢筋对ECC应力-应变曲线的影响。结果表明:ECC柱在破坏后依然能保持良好的整体性,且裂缝宽度明显低于普通混凝土柱;超高强钢筋ECC柱的纵向钢筋均达到屈服强度,极限承载力和极限竖向应变均大于普通混凝土试件;超高强钢筋与ECC混凝土之间的协同性明显优于普通混凝土;ECC柱的泊松比随着加载的进行先逐渐变小,然后有一定程度的增加。 Abstract: The axial compression test of HRB500 and ECC rectangular section short column was carried out, and the effect of HRB500 with reinforcement ratio of 1.13% and 2.26% on the stress-strain curve of ECC column was studied. The results show that the ECC column can still maintain good integrity after failure, and the crack width is obviously lower than that of ordinary concrete column. The longitudinal reinforcement of ultra-high strength steel bar ECC column can reach yield strength, and the ultimate bearing capacity and ultimate vertical strain of ECC column are larger than those of ordinary concrete column. The synergy between ultra-high strength steel bar and ECC concrete is obviously better than that of ordinary concrete. The Poisson′s ratio of ECC column gradually decreases as the loading progresses, and then increases to some extent.
汪知文,李碧雄,游杨,等.超高强钢筋ECC柱轴心受压试验研究[J].混凝土与水泥制品,2020(10):51-54. WANG Z W,LI B X,YOU Y,et al.Experimental Study on Axial Compression of ECC Columns with Ultra-high Strength Reinforced Steel[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):51-54.
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