Effects of cold-bonded artificial aggregate properties on the behaviour of concrete

IF 1.8 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Express Pub Date : 2024-08-23 DOI:10.1088/2053-1591/ad6ef2

Gopal Bharamappa Bekkeri, Kiran K Shetty, Gopinatha Nayak

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Abstract

The study investigates the use of artificial aggregates (AAs), specifically manufactured from ground granulated blast furnace slag (GGBFS) and ordinary Portland cement (OPC), to mitigate environmental harm caused by illegal quarrying due to the scarcity of natural aggregates (NAs). A cold-bonded pelletization technique was employed to produce five types of AAs with varying proportions of GGBFS & OPC as 82.5:17.5, 85:15, 87.5:12.5, 90:10, 95:5. The AAs with maximum OPC content exhibited a density of 1298 kg m⁻³, water absorption of 4.8%, and crushing and impact values of 28.6% and 26.3%, respectively. The impact of these AAs on concrete properties was assessed, revealing that AAs facilitated the production of workable concrete with low-density ranges between 1700–2337 kg m⁻³. Despite a decrease in concrete strength with higher AAs content, structural requirements were met, demonstrating AAs’ potential to effectively substitute natural coarse aggregates (NCAs). The concrete microstructure confirmed the formation of a strong interfacial transition zone (ITZ) and strength-developing cement-hydrated products. This research underscores the scientific contribution of AAs to address aggregate scarcity sustainably and recommends its application in structural elements by experimental validation.

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冷粘合人工骨料特性对混凝土性能的影响

本研究调查了人工集料（AAs）的使用情况，特别是由磨细高炉矿渣（GGBFS）和普通硅酸盐水泥（OPC）制成的人工集料，以减轻因天然集料（NAs）稀缺而非法采石造成的环境危害。采用冷粘结造粒技术生产了五种 AA，其中 GGBFS 和 OPC 的比例各不相同，分别为 82.5:17.5、85:15、87.5:12.5、90:10 和 95:5。OPC 含量最高的 AA 密度为 1298 kg m-3，吸水率为 4.8%，压碎值和冲击值分别为 28.6% 和 26.3%。评估了这些 AA 对混凝土性能的影响，结果表明，AA 有利于生产工作性混凝土，其低密度范围在 1700-2337 kg m-3 之间。尽管 AAs 含量越高，混凝土强度越低，但仍能满足结构要求，这表明 AAs 具有有效替代天然粗集料（NCAs）的潜力。混凝土的微观结构证实形成了强大的界面过渡区（ITZ）和强度发展水泥水化产物。这项研究强调了 AAs 在可持续解决骨料稀缺问题方面的科学贡献，并建议通过实验验证将其应用于结构元件中。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Research Express MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

4.50

自引率

4.30%

发文量

640

审稿时长

12 weeks

期刊介绍： A broad, rapid peer-review journal publishing new experimental and theoretical research on the design, fabrication, properties and applications of all classes of materials.