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Durability of Structural Lightweight Concrete Containing Expanded Perlite Aggregate
International Journal of Concrete Structures and Materials ( IF 3.6 ) Pub Date : 2020-09-21 , DOI: 10.1186/s40069-020-00425-w
Mohammed Ibrahim , Aftab Ahmad , Mohammed S. Barry , Luai M. Alhems , A. C. Mohamed Suhoothi

This study focuses on the development of durable structural lightweight concrete (LWC) by incorporating expanded perlite aggregate (EPA) in the range of 0 to 20% by weight. In order to ensure its durability when exposed to chloride environment, concrete was produced with low water-to-cement ratio and ordinary Portland cement (OPC) was replaced with 50% and 7% ground granulated blast furnace slag (GGBFS) and silica fume (SF), respectively. The mechanical properties and durability of concrete were assessed by determining the unit weight, compressive strength, flexural strength, drying shrinkage, chloride permeability and migration, as well as resistance of concrete to corrosion of reinforcing steel. Very importantly, thermal insulation properties were determined using a hot guarded plate. In addition, a finite element model (FEM) was prepared to study the behavior of EPA-modified concrete under seismic loading. The results showed that the unit weight of concrete was reduced by 20% to 30% when compared with the normal weight concrete (NWC). The compressive strength of the developed LWC was sufficient to be used as structural concrete, particularly of those mixtures containing 10% and 15% perlite aggregate. The durability of LWC was comparable to NWC in terms of chloride diffusion and resistance of concrete to corrosion of reinforcing steel. The tangible outcomes also include the superior thermal insulation properties of LWC compared to NWC. The greater incorporation of EPA in the concrete resulted in better behavior under seismic loading.

中文翻译:

含有膨胀珍珠岩骨料的结构轻质混凝土的耐久性

本研究的重点是通过加入 0 至 20% 重量百分比的膨胀珍珠岩骨料 (EPA) 来开发耐用的结构轻质混凝土 (LWC)。为了确保其暴露在氯化物环境中时的耐久性,混凝土采用低水灰比生产,普通硅酸盐水泥(OPC)用 50% 和 7% 磨碎的粒状高炉矿渣(GGBFS)和硅粉代替( SF),分别。混凝土的力学性能和耐久性通过测定单位重量、抗压强度、弯曲强度、干收缩、氯化物渗透率和迁移率以及混凝土对钢筋腐蚀的抵抗力来评估。非常重要的是,绝热性能是使用热防护板确定的。此外,准备了一个有限元模型 (FEM) 来研究 EPA 改性混凝土在地震载荷下的行为。结果表明,与正常重量混凝土(NWC)相比,混凝土的单位重量减少了20%至30%。开发的 LWC 的抗压强度足以用作结构混凝土,特别是那些含有 10% 和 15% 珍珠岩骨料的混合物。LWC 的耐久性在氯化物扩散和混凝土抗钢筋腐蚀方面与 NWC 相当。实际成果还包括 LWC 与 NWC 相比具有优越的隔热性能。在混凝土中更多地掺入 EPA 导致在地震载荷下的性能更好。结果表明,与正常重量混凝土(NWC)相比,混凝土的单位重量减少了20%至30%。开发的 LWC 的抗压强度足以用作结构混凝土,特别是那些含有 10% 和 15% 珍珠岩骨料的混合物。LWC 的耐久性在氯化物扩散和混凝土抗钢筋腐蚀方面与 NWC 相当。实际成果还包括 LWC 与 NWC 相比具有优越的隔热性能。在混凝土中更多地掺入 EPA 导致在地震载荷下的性能更好。结果表明,与正常重量混凝土(NWC)相比,混凝土的单位重量减少了20%至30%。开发的 LWC 的抗压强度足以用作结构混凝土,特别是那些含有 10% 和 15% 珍珠岩骨料的混合物。LWC 的耐久性在氯化物扩散和混凝土抗钢筋腐蚀方面与 NWC 相当。实际成果还包括 LWC 与 NWC 相比具有优越的隔热性能。在混凝土中更多地掺入 EPA 导致在地震载荷下的性能更好。特别是那些含有 10% 和 15% 珍珠岩骨料的混合物。LWC 的耐久性在氯化物扩散和混凝土抗钢筋腐蚀方面与 NWC 相当。实际成果还包括 LWC 与 NWC 相比具有优越的隔热性能。在混凝土中更多地掺入 EPA 导致在地震载荷下的性能更好。特别是那些含有 10% 和 15% 珍珠岩骨料的混合物。LWC 的耐久性在氯化物扩散和混凝土抗钢筋腐蚀方面与 NWC 相当。实际成果还包括 LWC 与 NWC 相比具有优越的隔热性能。在混凝土中更多地掺入 EPA 导致在地震载荷下的性能更好。
更新日期:2020-09-21
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