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Mechanical Properties and Durability of High-Performance Concretes Blended with Circulating Fluidized Bed Combustion Ash and Slag as Replacement for Ordinary Portland Cement
Advances in Materials Science and Engineering ( IF 2.098 ) Pub Date : 2020-09-29 , DOI: 10.1155/2020/8613106
Zhi Cheng 1 , Lei He 1 , Lan Liu 1 , Zhijun Cheng 1 , Xiaobo Pei 1 , Zhe Ma 1 , Vojtěch Václavík
Affiliation  

This study investigates the mechanical properties and durability of three families of high-performance concrete (HPC), in which the first was blended with fly ash, the second with circulating fluidized bed combustion (CFBC) ash, and the third with CFBC slag. In addition to each of the three mineral additives, silica fume and a superplasticizer were also incorporated into the HPC. Hence, three families of HPC, containing 10%, 20%, and 30% mineral admixtures and 9% silica fume of the binder mass, respectively, were produced. The microstructure and hydration products of the HPC families were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD) to explore the influence of fly ash, CFBC ash, and CFBC slag on the compressive strength and frost resistance of HPC. The experimental results show that the compressive strength of HPC could reach 60 MPa at 28 d age. When the fly ash content was 30%, the compressive strength of HPC was 70.2 MPa at 28 d age; after the freeze-thaw cycle, the mass loss and strength loss of HPC were 0.63% and 8.9%, respectively. When the CFBC ash content was 20%, the compressive strength of HPC was 75 MPa at 28 d age. After the freeze-thaw cycle, the mass loss and strength loss of HPC were 0.17% and 0.81%, respectively.

中文翻译:

高性能水泥与循环流化床燃烧灰和矿渣混合代替普通硅酸盐水泥的力学性能和耐久性

这项研究调查了三种高性能混凝土(HPC)的机械性能和耐久性,其中第一种与粉煤灰混合,第二种与循环流化床燃烧(CFBC)灰混合,第三种与CFBC矿渣混合。除了这三种矿物添加剂中的每一种之外,硅粉和高效减水剂也都加入了高性能计算中。因此,产生了三类HPC,分别含有10%,20%和30%的矿物混合物和9%的硅粉。通过扫描电子显微镜(SEM)和X射线衍射(XRD)检查HPC家族的微观结构和水合产物,以探讨粉煤灰,CFBC灰和CFBC炉渣对HPC的抗压强度和抗冻性的影响。实验结果表明,在28 d龄时,HPC的抗压强度可达到60 MPa。当粉煤灰含量为30%时,HPC在28 d时的抗压强度为70.2 MPa。冻融循环后,HPC的质量损失和强度损失分别为0.63%和8.9%。当CFBC灰分含量为20%时,HPC在28 d时的抗压强度为75 MPa。冻融循环后,HPC的质量损失和强度损失分别为0.17%和0.81%。
更新日期:2020-09-29
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