Moisture uptake in concrete under freezing-thawing exposure

Liu Zhichao; Hansen Will

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Moisture uptake in concrete under freezing-thawing exposure

机译：冻融暴露下混凝土中的水分吸收

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Freezing-thawing (F-T) exposure produces higher absorption in concrete than an isothermal condition. This work investigated the moisture absorption characteristics in different air-entrained concrete mixtures under two exposure conditions (water and a 3% salt solution) by simultaneously monitoring the weight change, mass loss and internal damage of 100 x 100 x 70 mm concrete blocks subjected to repetitive F-T cycles. The results indicate that permanent bulk moisture uptake is primarily a result of the accelerated saturation of poorly connected capillary pores, the slow filling of entrained air voids in concrete mixes with sufficient air entrainment, or the re-saturation of newly generated cracks in concrete with poor frost resistance. No detectable discrepancy was observed in moisture uptake between water and salt exposures, but the mass loss difference was found to be substantial. The measured bulk absorption is not a reliable predictor for salt frost scaling resistance, since it reflects the universal moisture condition in the specimen while scaling deterioration is dominated by the degree of saturation in a thin surface region.

机译：冻融（F-T）暴露在混凝土中的吸收比等温条件高。这项工作通过同时监测100 x 100 x 70 mm的混凝土砌块的重量变化，质量损失和内部损坏，研究了两种暴露条件（水和3％盐溶液）下不同加气混凝土混合物的吸湿特性。重复的FT周期。结果表明，永久性的大量水分吸收主要是由于连接不良的毛细孔的加速饱和，混凝土混合物中夹杂的空气空隙的缓慢填充以及足够的空气夹带，或者不良的混凝土中新产生的裂缝的重新饱和所致。抗冻性。在水和盐接触之间没有观察到水分吸收的差异，但是发现质量损失差异很大。测得的体积吸收率不是抗盐霜结垢性能的可靠预测指标，因为它反映了样品中的普遍水分状况，而结垢劣化主要由薄表面区域的饱和度决定。

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来源
《Magazine of Concrete Research》 |2016年第12期|619-631|共13页
作者
Liu Zhichao; Hansen Will;
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作者单位

Univ Michigan, Dept Civil & Environm Engn, Ann Arbor, MI 48109 USA;

Univ Michigan, Dept Civil & Environm Engn, Ann Arbor, MI 48109 USA;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
cement; cementitious materials; durability-related properties; moisture-related properties;

机译：水泥;胶凝材料;耐久性相关的特性;水分相关的特性;

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1. Effects of saturation degrees, freezing-thawing, and curing on geotechnical properties of lime and lime-cement concretes [J] . Jahandari Soheil, Saberian Mohammad, Tao Zhong, Cold regions science and technology . 2019,第APRa期

机译：饱和度，冻融和固化对石灰和石灰水泥混凝土岩土性能的影响
2. Effects of saturation degrees, freezing-thawing, and curing on geotechnical properties of lime and lime-cement concretes [J] . Jahandari Soheil, Saberian Mohammad, Tao Zhong, Cold regions science and technology . 2019,第Apra期

机译：饱和度，冷冻解冻和固化对石灰和石灰水泥混凝土岩土性能的影响
3. Freezing-thawing and impact resistance of concretes containing waste crumb rubbers [J] . Gonen Tahir Construction and Building Materials . 2018,第JULa20期

机译：含废胶粒的混凝土的冻融和抗冲击性
4. Use of Electrochemical Impedance Spectroscopy to Monitor Delamination and Moisture Uptake in CFRP-Reinforced Concrete Structures [C] . G. D. DAVIS, M. J. RICH, L. T. DRZAL Proceedings of the American Society for Composites Thirtieth technical conference . 2015

机译：使用电化学阻抗谱监测CFRP增强混凝土结构的分层和水分吸收
5. The coupled effect of moisture diffusion chloride penetration and freezing-thawing on concrete durability. [D] . Ababneh, Ayman Nureddin. 2002

机译：水分扩散氯化物渗透和冻融对混凝土耐久性的耦合作用。
6. Effect of pH temperature and freezing-thawing on quantity changes and cellular uptake of exosomes [O] . Yirui Cheng, Qingyu Zeng, Qing Han, 2019

机译：pH温度和冻融对外泌体数量变化和细胞摄取的影响
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。

Moisture uptake in concrete under freezing-thawing exposure

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