Comparison of carbonation of lightweight concrete with normal weight concrete at similar strength levels

T.Y. Lo; W.C. Tang; A. Nadeem

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Comparison of carbonation of lightweight concrete with normal weight concrete at similar strength levels

机译：轻度混凝土与普通重量混凝土在相同强度水平下碳化的比较

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This paper presents a study on accelerated carbonation testing of normal weight concrete (NWC) and lightweight concrete (LWC) mixes proportioned for three levels of strength grades. Two types of curing regimes were applied; (1) hot curing in water at 60 ℃ for 3 days and (2) normal curing in water at 27 ℃ for 28 days. Pulverized fuel ash (PFA) at 25% and silica fume (SF) at 5% and 10% replacement of ordinary Portland cement (OPC) in concrete were utilized to blend binary and ternary mixes in addition to OPC mixes. The results indicated that the effect of hot water curing on compressive strength development was more prominent in PFA/SF incorporated mixes than OPC mixes. The carbonation of LWC mixes was lower than NWC mixes at similar strength levels. The mixes with 25% PFA had marginally higher carbonation than OPC mixes under both hot and normal curing. The incorporation of SF in concrete mixes also increased the carbonation. Mixes under hot water curing had higher carbonation than mixes under normal curing.

机译：本文介绍了按三种强度等级的比例对普通重量混凝土（NWC）和轻质混凝土（LWC）混合物进行加速碳化试验的研究。应用了两种类型的固化方案：（1）在60℃的水中热固化3天，以及（2）在27℃的水中正常固化28天。除OPC混合料外，还使用25％的粉煤灰（PFA）和5％和10％的普通硅酸盐水泥（OPC）替代混凝土中的硅粉（SF）来混合二元和三元混合物。结果表明，与OPC混合料相比，PFA / SF混合料中热水固化对抗压强度发展的影响更为显着。在相似的强度水平下，轻质碳化钨混合物的碳化度低于轻质碳化钨混合物。在热固化和普通固化下，含25％PFA的混合物的碳酸化度均略高于OPC混合物。 SF在混凝土混合物中的掺入也增加了碳化作用。热水固化下的混合物碳化程度高于正常固化下的混合物。

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来源
《Construction and Building Materials》 |2008年第8期|p.1648-1655|共8页
作者
T.Y. Lo; W.C. Tang; A. Nadeem;
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作者单位

Department of Building and Construction, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong;

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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
中图分类建筑材料;
关键词
lightweight concrete; fly ash; silica fume; carbonation; high temperature curing;

机译：轻质混凝土;粉煤灰;硅粉;碳化;高温养护;

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机译：高温养护对火山灰结构轻质混凝土强度和碳化的影响
2. Bond strength evaluation of palm oil fuel ash-based geopolymer normal weight and lightweight concretes with steel reinforcement [J] . Mo Kim Hung, Yeap Kee Wei, Alengaram U. Johnson, Journal of Adhesion Science and Technology: The International Journal of Theoredtical and Basic Aspects of Adhesion Science and Its Applications in All Areas of Technology . 2018,第1a4期

机译：钢油燃料灰煤基缘重量和轻质混凝土钢材强度评价
3. Concrete Shear Strength of Normal and Lightweight Concrete Beams Reinforced with FRP Bars [J] . Chung Ho Kim, Heui Suk Jang Journal of Composites for Construction . 2014,第2期

机译：FRP筋加固普通轻型混凝土梁的混凝土抗剪强度
4. Effects of basalt fiber in lightweight expanded clay concrete on compressive strength and flexural strength of lightweight basalt fiber reinforced concrete [C] . P C Chiadighikaobi International Conference on Sustainable Infrastructural Development . 2020

机译：轻质膨胀粘土混凝土玄武岩纤维对轻质玄武岩纤维钢筋混凝土抗压强度和抗弯强度的影响
5. Shear strength of reinforced and prestressed concrete beams with lightweight aggregate concrete. [D] . Malone, Brian Joseph. 1999

机译：钢筋混凝土和预应力混凝土梁与轻质骨料的抗剪强度。
6. Mechanical Properties of Chopped Basalt Fiber-Reinforced Lightweight Aggregate Concrete and Chopped Polyacrylonitrile Fiber Reinforced Lightweight Aggregate Concrete [O] . Yusheng Zeng, Xianyu Zhou, Aiping Tang, 2020

机译：切碎的玄武岩纤维增强轻质骨料混凝土的力学性能和切碎的聚丙烯腈纤维增强的轻质骨料混凝土的力学性能
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. Durability of Lightweight Concrete. Phase II. Wetting and Drying Tests of Lightweight Concrete [R] . Rushing, H. B. 1966

机译：轻质混凝土的耐久性。第二阶段。轻质混凝土的湿润和干燥试验

Comparison of carbonation of lightweight concrete with normal weight concrete at similar strength levels

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