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发布时间:2020-01-06 00:00:00
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水泥混凝土制品

大口径PHC管桩混凝土的耐久性试验及工程应用研究
大口径PHC管桩混凝土的耐久性试验及工程应用研究
  • 户广旗
2024年第5期
摘要
引用本文
摘   要:研究了单掺、复掺超细粉煤灰(UFA)、超细矿粉(UMP)、硅灰(SF)对大口径PHC管桩混凝土耐久性的影响,优选出了最佳配合比,并在此基础上,考虑生产经济性,通过优化养护制度,制备了PHC1000AB130管桩。结果表明:当m水泥∶mUMP∶mSF=36∶5∶9、水胶比为0.28时,混凝土耐久性能最佳,其氯离子迁移系数为0.4×10-12 m2/s,280次干湿循环后混凝土抗硫酸盐耐蚀系数为0.85,混凝土抗渗等级达到P20;采用上述配合比生产的PHC1000AB130管桩,施工过程中平均贯入度为0.7~0.8 cm/击,沉桩过程中桩头、桩身均未破损,沉桩效果良好。 Abstract: The effects of single and compound addition of ultra-fine fly ash (UFA), ultra-fine mineral powder (UMP), and silica fume (SF) on the durability of large-diameter PHC pile concrete were studied, and the optimal mix proportion was selected. Based on this, considering production economy, PHC1000AB130 piles were prepared by optimizing the maintenance system. The results show that when mcement: mUMP: mSF=36∶5∶9, and the water cement ratio is 0.28, the durability of concrete is optimal, the chloride ion migration coefficient is 0.4×10-12 m2/s. After 280 dry wet cycles, the sulfate corrosion resistance coefficient of concrete is 0.85, and the impermeability grade of concrete reaches P20. The PHC1000AB130 pile produced by using the above mix proportion has an average penetration of 0.7~0.8 cm/beat during the construction process. The pile head and body of piles are not damaged during the pile sinking process, and the pile sinking effect is good.
户广旗.大口径PHC管桩混凝土的耐久性试验及工程应用研究[J].混凝土与水泥制品,2024(5):42-45,50. HU G Q.Study of durability test and engineering application on large-diameter PHC pile concrete[J].China Concrete and Cement Products,2024(5):42-45,50.
UHPC加固钢筋混凝土T梁的抗弯承载力计算
UHPC加固钢筋混凝土T梁的抗弯承载力计算
  • 靳玉栋1,陈 聪1,刘 鹤2,郭玉鹏1,亓兴军2,*
2024年第5期
摘要
引用本文
摘   要:综合考虑结构设计原理与现行桥梁加固规范,推导了UHPC加固钢筋混凝土T梁的抗弯承载力基本假定及计算公式,采用非线性有限元软件建立了试件的三维实体模型,进行了四点弯曲模拟试验,并对比分析了理论公式计算值与数值模拟试验值。结果表明:在截面高度增加10~20 cm的情况下,UHPC加固试件的抗弯承载力有显著提升;加固试件的抗弯承载力数值模拟试验值均大于理论计算值,平均相对误差为14.4%,理论公式具有一定的安全储备;推导的理论计算公式能简单、快速地预测试件的抗弯承载力,可为UHPC加固钢筋混凝土T梁的理论计算与工程应用提供参考。 Abstract: The basic assumptions and formula for the flexural capacity of UHPC-reinforced concrete T-beam  were deduced by combining the structural design principle with the current bridge reinforcement code. The nonlinear finite element software was used to establish a three-dimensional solid model of a simply supported T-beam, carry out four-point bending simulation tests, and compare the calculated values of the theoretical formulas with the numerical simulation test values. The results show that the flexural load capacity of T-beam is significantly increased with a small increase of 10~20 cm in section height, which proves that ultra-high performance concrete is an excellent bridge reinforcement material with high reinforcement efficiency; the numerical simulation test values of flexural load capacity of T-beam are larger than the theoretical calculation values after reinforcement, with an average relative error of 14.4%, and the theoretical formulas have a certain amount of safety reserves. The formula derived from the research results can predict the flexural load capacity of T-beam combined section beams in a simple, safe and fast way, and provide a reference for the theoretical calculation and engineering application of ultra-high-performance concrete reinforced reinforced concrete T-beam.
靳玉栋,陈聪,刘鹤,等.UHPC加固钢筋混凝土T梁的抗弯承载力计算[J].混凝土与水泥制品,2024(5):46-50. JIN Y D,CHEN C,LIU H,et al.Calculation of flexural capacity of UHPC-reinforced concrete T-beams[J].China Concrete and Cement Products,2024(5):46-50.
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