Utilisation of steel furnace slag coarse aggregate in a low calcium fly ash geopolymer concrete
Utilisation of steel furnace slag coarse aggregate in a low calcium fly ash geopolymer concrete
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DOI：
10.1016/j.cemconres.2016.09.001
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发表时间：
2016-11-01
影响因子：
11.4
通讯作者：
Smith, Marc
中科院分区：
文献类型：
--
作者：
Khan, M. S. H.;Castel, Arnaud;Smith, Marc
研究了钢渣粗集料在钢渣-低钙粉煤灰地质聚合物混凝土中的性能。地质聚合物粘结剂由90%的低钙粉煤灰和10%的粒化高炉矿渣（GGBFS）组成。进行了机械和物理性能、收缩率和详细的微观结构分析。结果表明，与传统的GPC混凝土相比，采用SFS骨料的地聚合物混凝土具有更高的抗压强度、表面电阻率和脉冲速度。收缩结果表明，320天后，由于延迟的氧化钙（CaO）水合作用，没有膨胀或溶胀。没有传统的多孔界面过渡区（ITZ）检测使用扫描电子显微镜，表明SFS骨料和地质聚合物基质之间的更好的债券。能量色散谱的结果进一步揭示了钙（Ca）扩散的ITZ附近。拉曼光谱结果表明，没有新的晶相形成由于钙扩散。X射线荧光结果显示Mg从SFS骨料向地质聚合物基质扩散。Ca和Mg掺入到地质聚合物结构中以及SFS骨料和地质聚合物基质之间的更好的结合是在GPC中观察到的具有SFS骨料的较高抗压强度的最可能的原因。(C)2016爱思唯尔有限公司版权所有
This paper evaluates the performance of steel furnace slag (SFS) coarse aggregate in blended slag and low calcium fly ash geopolymer concrete (GPC). The geopolymer binder is composed of 90% of low calcium fly ash and 10% of ground granulated blast furnace slag (GGBFS). Mechanical and physical properties, shrinkage, and detailed microstructure analysis were carried out. The results showed that geopolymer concrete with SFS aggregate offered higher compressive strength, surface resistivity and pulse velocity than that of GPC with traditional aggregate. The shrinkage results showed no expansion or swelling due to delayed calcium oxide (CaO) hydration after 320 days. No traditional porous interfacial transition zone (ITZ) was detected using scanning electron microscopy, indicating a better bond between SFS aggregate and geopolymer matrix. Energy dispersive spectroscopy results further revealed calcium (Ca) diffusion at the vicinity of ITZ. Raman spectroscopy results showed no new crystalline phase formed due to Ca diffusion. X-ray fluorescence result showed Mg diffusion from SFS aggregate towards geopolymer matrix. The incorporation of Ca and Mg into the geopolymer structure and better bond between SFS aggregate and geopolymer matrix are the most likely reasons for the higher compressive strength observed in GPC with SFS aggregate. (C) 2016 Elsevier Ltd. All rights reserved.