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Fresh and hardened properties of self-compacting concrete containing recycled fine clay brick aggregates
Materials and Structures ( IF 3.4 ) Pub Date : 2021-07-13 , DOI: 10.1617/s11527-021-01751-5
Hongzhi Zhang 1, 2 , Huaqiang Yuan 1 , Zhi Ge 1 , Jiajie Wu 1 , Chen Fang 1 , Erik Schlangen 3 , Branko Šavija 3
Affiliation  

Clay brick is one of the major components of demolition waste, which is generally landfilled. Effective and new uses of recycled clay brick may provide sustainability benefits in terms of landfill reduction. Therefore, this research aims at applying Recycled fine clay brick aggregates (RFCBA) with sizes from 0.075 mm–4.75 mm to prepare Self-compacting concrete (SCC). The effects of RFCBA on fresh and hardened properties of SCC were investigated. Saturated surface dry RFCBA was used to replace Natural fine aggregate (NFA) with the percentage of 25%, 50%, 75% and 100%, respectively, in making the SCC mixes. Although experimental results showed that the flowability, passing ability, and segregation resistance of SCC containing RFCBA (RFCBA-SCC) decreased with the increasing RFCBA content, these properties still satisfy the criteria of SCC. The compressive strength, splitting strength, flexural strength, and elastic modulus of the RFCBA-SCC mixes decreased with an increase of RFCBA content. Due to their porous nature, recycled fine clay brick aggregates may also be a source of additional water for internal curing. The internal curing effect was confirmed by the mercury intrusion porosimetry, X-ray diffraction, and thermogravimetric analysis measurements. Moreover, a significant autogenous shrinkage reduction of SCC is achieved by using the RFCBA due to the release of additional water pre-stored in the RFCBA. Therefore, it can be concluded that the addition of RFCBA to SCC mixtures can provide additional practical benefits in the hardened state.



中文翻译:

含有再生细粘土砖骨料的自密实混凝土的新拌和硬化性能

粘土砖是拆迁垃圾的主要成分之一,通常被填埋。回收粘土砖的有效和新用途可以在减少垃圾填埋场方面提供可持续性优势。因此,本研究旨在应用尺寸为 0.075 mm–4.75 mm 的再生细粘土砖骨料 (RFCBA) 来制备自密实混凝土 (SCC)。研究了 RFCBA 对 SCC 新鲜和硬化性能的影响。在制备 SCC 混合料时,使用饱和表面干燥 RFCBA 分别以 25%、50%、75% 和 100% 的百分比代替天然细骨料 (NFA)。虽然实验结果表明,含 RFCBA 的 SCC(RFCBA-SCC)的流动性、通过能力和抗离析性随着 RFCBA 含量的增加而降低,但这些性能仍然满足 SCC 的标准。RFCBA-SCC 混合物的抗压强度、劈裂强度、弯曲强度和弹性模量随着 RFCBA 含量的增加而降低。由于其多孔性质,回收的细粘土砖骨料也可能是内部固化的额外水源。通过压汞孔隙率测定法、X 射线衍射和热重分析测量证实了内部固化效果。此外,由于预先储存在 RFCBA 中的额外水的释放,通过使用 RFCBA 实现了 SCC 的显着自收缩减少。因此,可以得出结论,将 RFCBA 添加到 SCC 混合物中可以在硬化状态下提供额外的实际好处。由于其多孔性质,回收的细粘土砖骨料也可能是内部固化的额外水源。通过压汞孔隙率测定法、X 射线衍射和热重分析测量证实了内部固化效果。此外,由于预先储存在 RFCBA 中的额外水的释放,通过使用 RFCBA 实现了 SCC 的显着自收缩减少。因此,可以得出结论,将 RFCBA 添加到 SCC 混合物中可以在硬化状态下提供额外的实际好处。由于其多孔性质,回收的细粘土砖骨料也可能是内部固化的额外水源。通过压汞孔隙率测定法、X 射线衍射和热重分析测量证实了内部固化效果。此外,由于释放了预先存储在 RFCBA 中的额外水,因此通过使用 RFCBA 可以显着减少 SCC 的自生收缩。因此,可以得出结论,将 RFCBA 添加到 SCC 混合物中可以在硬化状态下提供额外的实际好处。由于预先储存在 RFCBA 中的额外水的释放,通过使用 RFCBA 实现了 SCC 的显着自收缩减少。因此,可以得出结论,将 RFCBA 添加到 SCC 混合物中可以在硬化状态下提供额外的实际好处。由于预先储存在 RFCBA 中的额外水的释放,通过使用 RFCBA 实现了 SCC 的显着自收缩减少。因此,可以得出结论,将 RFCBA 添加到 SCC 混合物中可以在硬化状态下提供额外的实际好处。

更新日期:2021-07-13
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