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经热处理的废淤泥作为地质聚合物水泥中的填料

Thermally Treated Waste Silt as Filler in Geopolymer Cement.

作者信息

Solouki Abbas, Fathollahi Alireza, Viscomi Giovanni, Tataranni Piergiorgio, Valdrè Giovanni, Coupe Stephen J, Sangiorgi Cesare

机构信息

Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Via Terracini 28, 40131 Bologna, Italy.

Centre for Agroecology Water and Resilience (CAWR), Coventry University, Wolston Lane, Ryton-on-Dunsmore CV8 3LG, UK.

出版信息

Materials (Basel). 2021 Sep 6;14(17):5102. doi: 10.3390/ma14175102.

DOI:10.3390/ma14175102
PMID:34501190
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8434220/
Abstract

This study aims to investigate the feasibility of including silt, a by-product of limestone aggregate production, as a filler in geopolymer cement. Two separate phases were planned: The first phase aimed to determine the optimum calcination conditions of the waste silt obtained from Società Azionaria Prodotti Asfaltico Bituminosi Affini (S.A.P.A.B.A. s.r.l.). A Design of Experiment (DOE) was produced, and raw silt was calcined accordingly. Geopolymer cement mixtures were made with sodium or potassium alkali solutions and were tested for compressive strength and leaching. Higher calcination temperatures showed better compressive strength, regardless of liquid type. By considering the compressive strength, leaching, and X-ray diffraction (XRD) analysis, the optimum calcination temperature and time was selected as 750 °C for 2 h. The second phase focused on determining the optimum amount of silt (%) that could be used in a geopolymer cement mixture. The results suggested that the addition of about 55% of silt (total solid weight) as filler can improve the compressive strength of geopolymers made with Na or K liquid activators. Based on the leaching test, the cumulative concentrations of the released trace elements from the geopolymer specimens into the leachant were lower than the thresholds for European standards.

摘要

本研究旨在探讨将石灰石骨料生产的副产品淤泥作为地质聚合物水泥中的填料的可行性。计划分为两个阶段:第一阶段旨在确定从Società Azionaria Prodotti Asfaltico Bituminosi Affini(S.A.P.A.B.A. s.r.l.)获得的废淤泥的最佳煅烧条件。制定了实验设计(DOE),并据此对生淤泥进行煅烧。用钠或钾碱溶液制备地质聚合物水泥混合物,并测试其抗压强度和浸出情况。无论液体类型如何,较高的煅烧温度显示出更好的抗压强度。综合考虑抗压强度、浸出情况和X射线衍射(XRD)分析,选择750℃煅烧2小时作为最佳煅烧温度和时间。第二阶段重点确定可用于地质聚合物水泥混合物的淤泥最佳用量(%)。结果表明,添加约55%的淤泥(总固体重量)作为填料可提高用钠或钾液体活化剂制成的地质聚合物的抗压强度。基于浸出试验,地质聚合物试样向浸出液中释放的微量元素的累积浓度低于欧洲标准的阈值。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/96f5/8434220/fb4635b99b19/materials-14-05102-g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/96f5/8434220/fb4635b99b19/materials-14-05102-g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/96f5/8434220/fb4635b99b19/materials-14-05102-g013.jpg

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