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Effect of micro silica on fiber-reinforced self-compacting composites containing ceramic waste
Journal of Composite Materials ( IF 2.9 ) Pub Date : 2020-07-26 , DOI: 10.1177/0021998320944570
Alireza Mansoori 1 , Mohammad Mohtasham Moein 1 , Ehsan Mohseni 2
Affiliation  

This paper aims to evaluate the impact of ceramic waste powder (CWP), micro silica (MS) and steel fiber (SF) on self-compacting mortar. CWP at ratios of 10 and 20%, and MS at 1 and 5% by weight of cement were replaced the cement. Beside, SF was added at ratios of 0.5 and 1% of cement. Mini slump flow diameter and mini V-funnel flow time tests were carried out to determine the workability of fresh composites. Compressive strength, flexural strength, water absorption, electrical resistivity and drying shrinkage tests were performed on hardened mortars. Scanning electron microscope (SEM) technique was employed to assess the microstructure. The results indicated that CWP reduced the mechanical properties by about 20% and increased permeability by about 14%. However, inclusion of micro silica particles improved the properties outstandingly. Compressive strength increased about 30% by inclusion of MS. It was also observed that the addition of fibers from 0.5% to 1% increased the flexural strength. This improvement was more obvious in samples with higher contents of micro silica. It can be reported that by including the both micro silica and steel fibers, the bonding between the cement paste and fibers was developed. Replacement of micro silica led to increase of electrical resistivity by about 99% in samples containing 20% ceramic waste powder. The microstructure studies confirmed the significant increase of density and uniformity of the hydration products in the presence of micro silica particles.

中文翻译:

微硅粉对含陶瓷废料的纤维增强自密实复合材料的影响

本文旨在评估陶瓷废粉(CWP)、微硅粉(MS)和钢纤维(SF)对自密实砂浆的影响。比例为 10% 和 20% 的 CWP 和按水泥重量计 1% 和 5% 的 MS 替代了水泥。此外,SF 的添加比例为水泥的 0.5% 和 1%。进行了迷你坍落度流动直径和迷你 V 型漏斗流动时间测试,以确定新复合材料的可加工性。对硬化砂浆进行了抗压强度、弯曲强度、吸水率、电阻率和干收缩试验。采用扫描电子显微镜(SEM)技术来评估微观结构。结果表明,CWP 使机械性能降低了约 20%,渗透率增加了约 14%。然而,包含微二氧化硅颗粒显着改善了性能。通过包含 MS,压缩强度增加了约 30%。还观察到,添加 0.5% 至 1% 的纤维增加了弯曲强度。这种改进在微硅含量较高的样品中更为明显。据报道,通过同时加入微硅石和钢纤维,水泥浆和纤维之间的结合得到了发展。在含有 20% 陶瓷废粉的样品中,微硅粉的替代导致电阻率增加了约 99%。微观结构研究证实了在微二氧化硅颗粒存在下水化产物的密度和均匀性显着增加。这种改进在微硅含量较高的样品中更为明显。据报道,通过同时加入微硅石和钢纤维,水泥浆和纤维之间的结合得到了发展。在含有 20% 陶瓷废粉的样品中,微硅粉的替代导致电阻率增加了约 99%。微观结构研究证实了在微二氧化硅颗粒存在下水化产物的密度和均匀性显着增加。这种改进在微硅含量较高的样品中更为明显。据报道,通过同时加入微硅石和钢纤维,水泥浆和纤维之间的结合得到了发展。在含有 20% 陶瓷废粉的样品中,微硅粉的替代导致电阻率增加了约 99%。微观结构研究证实了在微二氧化硅颗粒存在下水化产物的密度和均匀性显着增加。
更新日期:2020-07-26
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