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BOUND WATER CONTENT, PERMEABILITY AND RESIDUAL COMPRESSIVE STRENGTH OF CONCRETE AT HIGH TEMPERATURES

机译：高温下混凝土的束缚水含量，渗透率和残余抗压强度

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Concrete damage by high temperatures includes weight loss, strength and modulus reductions and the formation of cracks and large pores. Thermal treatment reduces the amount of chemically bound water in the hydrate phase. A rise in temperature affects the pore structure by reducing the specific surface of hydration products. Cement paste becomes more heterogeneous in microstructure and coarser in pore structure. This reveals in higher pore median radius, total porosity and volume of large pores in a weight unit of hydrated cement paste of concrete. Compressive strength is not only significant parameter showing structural integrity of concrete; permeability influences concrete durability as well. To demonstrate this, permeability coefficients at various high temperatures are presented. The key quantitative insight into the hydrate phase decomposition is based on thermal analysis results. Thermo gravimetric (TG) mass losses are related to the hydrate phase changes. The tests employing TG mass losses answer the question if the hydrate phase is present at individual high-temperature levels and what its quantitative state is. Strength estimations and methods of pore intrusion porosimetry with calculated permeability coefficients and thermal analysis are suitable for the interpretation of concrete behaviour when subjected to high-temperature attack. Conclusions are drawn about residual properties of concrete specimens from Temelin (Czech Republic), Mochovce (Slovakia) and Penly (France) nuclear power plant (NPP); when subjected to temperatures up to 800℃. Relations among compressive strength, permeability, pore median radius and bound water content in concretes are discussed and concrete resistance with various mixture compositions is compared.

机译：高温对混凝土的破坏包括重量损失，强度和模量降低以及裂缝和大孔的形成。热处理减少了水合物相中化学结合的水量。温度升高通过降低水合产物的比表面积来影响孔结构。水泥浆在微观结构上变得更加不均匀，在孔隙结构上变得更加粗糙。这表明，以水合水泥糊料的重量单位计，孔隙中值半径，总孔隙率和大孔隙的体积更大。抗压强度不仅是显示混凝土结构完整性的重要参数，而且还具有抗压强度。渗透性也会影响混凝土的耐久性。为了证明这一点，提出了各种高温下的渗透系数。水合物相分解的关键定量见解基于热分析结果。热重（TG）质量损失与水合物相变有关。使用TG质量损失的测试回答了以下问题：水合物相是否存在于各个高温水平下以及其定量状态是什么。具有计算的渗透系数和热分析的强度估算和孔隙侵入孔隙率法，适用于解释遭受高温侵蚀时的混凝土行为。得出了来自Temelin（捷克共和国），Mochovce（斯洛伐克）和Penly（法国）核电站（NPP）的混凝土标本的残余性能的结论；当温度高达800℃时。讨论了混凝土的抗压强度，渗透率，孔隙中值半径和结合水含量之间的关系，并比较了各种混合料的混凝土抗力。

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来源
《Role of Concrete in Nuclear Facilities》|2005年|51-58|共8页
会议地点 Dundee(GB)
作者
Ivan Janotka; Lubomir Bagel;
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作者单位

Institute of Construction and Architecture Slovakia;

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会议组织
原文格式 PDF
正文语种 eng
中图分类混凝土结构、钢筋混凝土结构;
关键词
concrete; high temperature; porosity; permeability; thermal analysis; resistance;

机译：具体;高温;孔隙率渗透性热分析；抵抗性;

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1. Effect of Various Moisture Contents, Variety and Dosage of Fibers on Explosive Spalling and Residual Compressive Strength of High Performance Concrete Subjected to High Temperatures [J] . Song-Hua Bian, Gai-Fei Peng, Zhang-Li Zhao, Key Engineering Materials . 2006,第期

机译：纤维的各种水分含量，种类和用量对高温下高性能混凝土的爆炸剥落和残余抗压强度的影响
2. Pore structures, permeabilities, and compressive strengths of concrete at temperatures up to 800 deg. C [J] . Ivan Janotka, Lubomir Bagel ACI Materials Journal . 2002,第2期

机译：温度高达800度时混凝土的孔结构，渗透性和抗压强度。 C
3. Effect of cooling methods on residual compressive strength and cracking behavior of fly ash concretes exposed at elevated temperatures [J] . Shaikh Faiz U. A., Vimonsatit Vanissorn Fire and materials . 2016,第2期

机译：冷却方法对高温下暴露的粉煤灰混凝土残余抗压强度和开裂行为的影响
4. BOUND WATER CONTENT, PERMEABILITY AND RESIDUAL COMPRESSIVE STRENGTH OF CONCRETE AT HIGH TEMPERATURES [C] . Ivan Janotka, Lubomir Bagel International Conference on Role of Concrete in Nuclear Facilities . 2005

机译：高温下混凝土的结合水含量，渗透性和残余抗压强度
5. The effectiveness of concrete temperature and entrained air content in concrete compressive strength. [D] . Barghout, Saad Farid. 1999

机译：混凝土温度和夹带空气含量对混凝土抗压强度的影响。
6. Residual Compressive Strength of Recycled Aggregate Concretes after High Temperature Exposure [O] . Francisco B. Varona, Francisco Baeza-Brotons, Antonio J. Tenza-Abril, 2020

机译：高温暴露后再生骨料混凝土的残余抗压强度
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. Reducing the Effect of Freezing Temperatures on the Compressive Strength of Concrete with Calcium Chloride and Air Entrainment [R] . Fairbank, C. S. 1965

机译：用氯化钙和空气夹带降低冻结温度对混凝土抗压强度的影响

BOUND WATER CONTENT, PERMEABILITY AND RESIDUAL COMPRESSIVE STRENGTH OF CONCRETE AT HIGH TEMPERATURES

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