再生细骨料超高性能混凝土的抗硫酸盐性能

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-08-31 DOI:10.1680/jadcr.21.00187

Bin-bin Zhang, Y. Ma, Guanji Lyu, Shikang Wu, Hui-Ning Jiang, Yantong Hu, Tao Ji

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引用次数: 0

摘要

研究了硫酸盐侵蚀对再生细骨料超高性能混凝土强度的影响。RFA用于替代天然细骨料(NFA)，重量分别为0%、50%和100%。UHPC样品在10%硫酸钠溶液中浸泡0-180 d (SA年龄)。研究了硫酸盐离子浓度、UHPC的抗折强度和抗压强度。采用ITZ、XRD、SEM-EDS、MIP等多技术分析了复合材料在SA前后的微观结构。结果表明，随着SA龄期的增加，掺RFA的UHPC的抗压强度增大。生成的石膏和钙矾石将UHPC基质中的有害孔隙(> ~ 20nm)细化为无害孔隙(< 20nm)。在相同SA年龄下，随着RFA含量的增加，UHPC的硫酸盐离子浓度也随着RFA含量的增加而增加，这是由于RFA引入了更多的ITZ、孔隙和微裂纹。建立了不同RFA含量的UHPC在SA作用下的强度发展模型。

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Sulfate resistance of ultra-high performance concrete with recycled fine aggregate

The effect of sulfate attack (SA) on the strength of ultra-high performance concrete (UHPC) with recycled fine aggregate (RFA) is investigated. RFA is used to replace natural fine aggregate (NFA) at 0%, 50% and 100% by weight. UHPC samples are soaked in 10% sodium sulfate solution for 0–180 d (SA age). The sulfate ion concentration, flexural strength and compressive strength of UHPC are investigated. The microstructure of UHPC before and after SA is analysed through a multi-technique approach (ITZ, XRD, SEM-EDS and MIP). Results indicate that with the increase of SA age, the compressive strength of UHPC with RFA increases. The generated gypsum and ettringite refine the harmful pores (>20 nm), which is converted to harmless pores (<20 nm) in UHPC matrix. At the same SA age, the sulfate ion concentration of UHPC increases with the increase of RFA content due to more ITZ, pores and microcracks introduced by RFA. The strength development models of UHPC with different RFA content under SA are developed.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.