Assessing the impact of recycled mortar powder on the strength, durability and microstructural characteristics of geopolymer concrete

IF 2.7 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Material Cycles and Waste Management Pub Date : 2024-06-14 DOI:10.1007/s10163-024-01999-3

Paramveer Singh, Kanish Kapoor

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Abstract

The recycling of concrete waste and its utilization in new concrete production can be a great contribution to a sustainable environment. In the present study, the impact of recycled mortar powder (RMP) was accessed on fly ash (FA) based geopolymer concrete (GC). The RMP was substituted with FA in the range of 0–50%. The durability properties such as capillary suction test (CST), initial surface absorption test (ISAT) and acid attack test were accessed and strength property was also evaluated in terms of compressive strength at ambient curing. Further, the ultrasonic pulse velocity (UPV) test and electrical resistivity test were also conducted for all GC mixes. The present study outcome shows that the overall properties of GC improved with the addition of RMP up to 30%. Moreover, the addition of RMP provides the early activation of GC due to calcium (Ca) compounds present in RMP. The microstructural characteristics of GC mixes were analyzed using field emission scanning electronic microscopy (FESEM) along with Fourier transform infrared (FTIR) spectroscopy and it revealed that the presence of Ca compound in RMP form additional nucleation sites i.e., calcium/sodium alumina-silicate hydrate gel with a polymeric chain which enhance the overall properties of the GC.

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评估回收砂浆粉末对土工聚合物混凝土强度、耐久性和微观结构特征的影响

混凝土废料的回收利用及其在新混凝土生产中的应用可为可持续环境做出巨大贡献。本研究探讨了回收砂浆粉（RMP）对粉煤灰土工聚合物混凝土（GC）的影响。回收砂浆粉与粉煤灰的替代率在 0-50% 之间。此外，还评估了耐久性能，如毛细管吸力试验（CST）、初始表面吸收试验（ISAT）和酸侵蚀试验，以及常温养护时的抗压强度。此外，还对所有 GC 混合料进行了超声波脉冲速度（UPV）测试和电阻率测试。研究结果表明，RMP 的添加量达到 30% 时，GC 的整体性能得到了改善。此外，由于 RMP 中含有钙（Ca）化合物，因此 RMP 的添加可使 GC 早日活化。使用场发射扫描电子显微镜（FESEM）和傅立叶变换红外光谱（FTIR）分析了 GC 混合物的微观结构特征，结果表明 RMP 中钙化合物的存在形成了额外的成核点，即带有聚合物链的钙/钠氧化铝硅酸盐水合物凝胶，从而提高了 GC 的整体性能。

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

Journal of Material Cycles and Waste Management 环境科学-环境科学

CiteScore

5.30

自引率

16.10%

发文量

205

审稿时长

4.8 months

期刊介绍： The Journal of Material Cycles and Waste Management has a twofold focus: research in technical, political, and environmental problems of material cycles and waste management; and information that contributes to the development of an interdisciplinary science of material cycles and waste management. Its aim is to develop solutions and prescriptions for material cycles. The journal publishes original articles, reviews, and invited papers from a wide range of disciplines related to material cycles and waste management. The journal is published in cooperation with the Japan Society of Material Cycles and Waste Management (JSMCWM) and the Korea Society of Waste Management (KSWM).