EFFECT OF ULTRAFINE SLAG POWDER ON THE RHEOLOGICAL BEHAVIOUR, COMPRESSIVE STRENGTH, AND MICROSTRUCTURE OF ULTRA-HIGH PERFORMANCE CONCRETE

IF 0.6 4区 材料科学 Q4 MATERIALS SCIENCE, CERAMICS
Congqi Luan
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Abstract

The effect of the addition of ultrafine slag powder (USL) on the rheology, strength, and porosity of Ultra-High Performance Concrete (UHPC) was investigated, whose microstructure was analysed by XRD, NMR, XPS, and SEM. The results show that whether the USL was incorporated or not, the paste keeps its original shear thickening behaviour. However, the yield stress first increased and then decreased with the addition of the USL content. The change in the compressive strength of the UHPC kept close to that of the yield stress. Incorporating 20 % USL, the UHPC reached a maximum compressive strength of 147.8 MPa, which was increased by 12.2 % compared to the reference sample, and its porosity was 6.72 %, which was decreased by 14% compared to the reference sample. In addition to the formation of more C–S–H gels, the pozzolanic reaction of USL increased the chain length of C-S-H and the binding energy of Ca2p, Si2p, O1s, and Al2p. Furthermore, it reduced the Al/Si ratio and Ca2P-Si2P value, making the paste microstructure more compact.
超细矿渣粉对超高性能混凝土流变特性、抗压强度和微观结构的影响
研究了掺加超细矿渣粉(USL)对超高性能混凝土(UHPC)流变学、强度和孔隙率的影响,并采用XRD、NMR、XPS和SEM对其微观结构进行了分析。结果表明,无论是否加入USL,膏体均保持原有的剪切增稠特性。随着USL含量的增加,屈服应力先增大后减小。UHPC的抗压强度变化与屈服应力变化基本一致。添加20% USL后,UHPC的最大抗压强度为147.8 MPa,比参考样品提高了12.2%,孔隙率为6.72%,比参考样品降低了14%。USL的火山灰反应除了生成更多的C-S-H凝胶外,还增加了C-S-H的链长和Ca2p、Si2p、O1s、Al2p的结合能。降低了Al/Si比和Ca2P-Si2P值,使膏体组织更加致密。
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来源期刊
Ceramics-silikaty
Ceramics-silikaty 工程技术-材料科学:硅酸盐
CiteScore
1.40
自引率
11.10%
发文量
49
审稿时长
5.5 months
期刊介绍: The journal Ceramics-Silikáty accepts papers concerned with the following ranges of material science: Chemistry and physics of ceramics and glasses Theoretical principles of their engineering including computing methods Advanced technologies in the production of starting materials, glasses and ceramics Properties and applications of modern materials Special analytical procedures Engineering ceramic including composites Glass and ceramics for electronics and optoelectronics High temperature superconducting materials Materials based on cement or other inorganic binders Materials for biological application Advanced inorganic glasses with special properties Fibrous materials Coatings and films based on inorganic non-metallic materials.
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