Innovative procedure to produce high performance pretensioned concrete girders combining high strength concrete and normal or special concrete types

机译：创新程序生产高性能预张紧混凝土梁组合高强度混凝土和正常或特殊混凝土类型

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As is well known, prefabrication procedures allow significant reductions in construction time. In many countries, precast concrete bridges are customary and made up of pretensioned prestressed girders. Both the compressive and tensile strength of the concrete mix must be enough at transfer (which takes place typically two or three days after concrete casting) in order to avoid excessive prestress losses, and undesirable cracking. Many attempts have been made to increase the spectrum of the usual high performance concretes to other concrete types (i.e. normal strength concrete, lightweight concrete and recycled aggregate concrete). Why are these special concrete types not used in the current production of large pretensioned concrete girders? Technical problems have been observed at the critical zones: development length, geometrical discontinuities, supports, etc. A new technique has been developed by the authors to produce hybrid pretensioned concrete elements, combining the usual high strength concretes in the critical zones with other concrete types in the rest of the elements.

机译：众所周知，预制程序允许在施工时间内减少。在许多国家，预制混凝土桥梁是习惯性的，由预应力的预应力梁组成。混凝土混合物的压缩和拉伸强度都必须足够的转移（通常发生在混凝土铸件后两三天），以避免过度预先预损失，并且不希望的裂缝。已经提高了许多尝试，以将通常的高性能混凝土的频谱增加到其他混凝土类型（即正常强度混凝土，轻质混凝土和再生骨料混凝土）。为什么这些特殊的混凝土类型不用于当前生产大型预张加混凝土梁？在临界区观察到技术问题：发展长度，几何不连续性，支持等。作者开发了一种新的技术，以生产混合预张紧混凝土元件，将临界区中的通常的高强度混凝土与其他混凝土类型相结合在其余的元素中。

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《International Conference on High Performance Structures and Materials》|2006年||共8页
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C. Vazquez-Herrero; F. Martinez-Abella; Wessex Institute of Technology(WIT)(GB); Free University of Brussels(BE); High Performance Structures and Materials Book Series;
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中图分类工程材料一般性问题;
关键词
prestressed concrete; precast concrete; pre-tensioning; pretensioned; pretensioned; high performance; high strength; prestressed; girders; beams;

机译：预应力混凝土;预制混凝土;预张紧;预紧;预张力;高性能;高强度;预应力;梁;梁;

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专利

1. Long-Term Performance of Prestressed, Pretensioned High Strength Concrete Bridge Girders [J] . Barney T. Martin, Henry G. Russell, John J. Roller, PCI journal . 1995,第6期

机译：预应力，预张高强度混凝土桥梁的长期性能
2. Clustering Analysis of Normal Strength Concretes Produced with Different Aggregate Types [J] . Semsettin Kilincarslan, Ebru Yilmazlnce, Ebru Baspmar Tuncay Open Chemistry . 2018,第1aPta2期

机译：不同骨料类型生产的正常强度混凝土的聚类分析
3. Performance of CFRP-Strengthened Concrete Bridge Girders under Combined Live Load and Hydrocarbon Fire [J] . Beneberu Eyosias, Yazdani Nur Journal of bridge engineering . 2018,第7期

机译：CFRP加固混凝土桥梁在活荷载和碳氢化合物火灾作用下的性能
4. Innovative procedure to produce high performance pretensioned concrete girders combining high strength concrete and normal or special concrete types [C] . C. Vazquez-Herrero, F. Martinez-Abella International Conference on High Performance Structures and Materials; 2006; Ostends(BE) . 2006

机译：创新方法生产结合了高强度混凝土和普通或特殊混凝土类型的高性能预张混凝土梁
5. Residual Flexural Strength of Corroded AASHTO TYPE II Pretensioned Concrete Girder-deck System [D] . Yan, Bo 2019

机译：锈蚀的AASHTO II型预应力混凝土箱梁系统的残余挠曲强度
6. The Fire Resistance Performance of Recycled Aggregate Concrete Columns with Different Concrete Compressive Strengths [O] . Hongying Dong, Wanlin Cao, Jianhui Bian, 2014

机译：不同抗压强度的再生骨料混凝土柱的耐火性能
7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。
8. Prestress Losses in Pretensioned High-Strength Concrete Bridge Girders [R] . Tadros, M. K., Al-Omaishi, N., Seguirant, S. J., 2003

机译：预拉伸高强混凝土桥梁的预应力损失

Innovative procedure to produce high performance pretensioned concrete girders combining high strength concrete and normal or special concrete types

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