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不同浓度NaOH对粉煤灰地质聚合物聚集体颗粒间凝胶化的影响

The Effects of Various Concentrations of NaOH on the Inter-Particle Gelation of a Fly Ash Geopolymer Aggregate.

作者信息

Abdullah Alida, Hussin Kamarudin, Abdullah Mohd Mustafa Al Bakri, Yahya Zarina, Sochacki Wojciech, Razak Rafiza Abdul, Błoch Katarzyna, Fansuri Hamzah

机构信息

Geopolymer & Green Technology, Centre of Excellence (CEGeoGTech), Universiti Malaysia Perlis (UniMAP), Perlis 01000, Malaysia.

Faculty of Mechanical Engineering Technology, Universiti Malaysia Perlis (UniMAP), Perlis 01000, Malaysia.

出版信息

Materials (Basel). 2021 Feb 27;14(5):1111. doi: 10.3390/ma14051111.

DOI:10.3390/ma14051111
PMID:33673522
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7956834/
Abstract

Aggregates can be categorized into natural and artificial aggregates. Preserving natural resources is crucial to ensuring the constant supply of natural aggregates. In order to preserve these natural resources, the production of artificial aggregates is beginning to gain the attention of researchers worldwide. One of the methods involves using geopolymer technology. On this basis, this current research focuses on the inter-particle effect on the properties of fly ash geopolymer aggregates with different molarities of sodium hydroxide (NaOH). The effects of synthesis parameters (6, 8, 10, 12, and 14 M) on the mechanical and microstructural properties of the fly ash geopolymer aggregate were studied. The fly ash geopolymer aggregate was palletized manually by using a hand to form a sphere-shaped aggregate where the ratio of NaOH/NaSiO used was constant at 2.5. The results indicated that the NaOH molarity has a significant effect on the impact strength of a fly ash geopolymer aggregate. The highest aggregate impact value (AIV) was obtained for samples with 6 M NaOH molarity (26.95%), indicating the lowest strength among other molarities studied and the lowest density of 2150 kg/m. The low concentration of sodium hydroxide in the alkali activator solution resulted in the dissolution of fly ash being limited; thus, the inter-particle volume cannot be fully filled by the precipitated gels.

摘要

集料可分为天然集料和人工集料。保护自然资源对于确保天然集料的持续供应至关重要。为了保护这些自然资源，人工集料的生产开始受到全球研究人员的关注。其中一种方法涉及使用地质聚合物技术。在此基础上，本研究聚焦于不同摩尔浓度氢氧化钠（NaOH）对粉煤灰地质聚合物集料性能的颗粒间效应。研究了合成参数（6、8、10、12和14 M）对粉煤灰地质聚合物集料力学性能和微观结构性能的影响。通过手工将粉煤灰地质聚合物集料制成球形颗粒，其中使用的NaOH/NaSiO比例恒定为2.5。结果表明，NaOH摩尔浓度对粉煤灰地质聚合物集料的冲击强度有显著影响。NaOH摩尔浓度为6 M的样品获得了最高的集料冲击值（AIV）（26.95%），表明在研究的其他摩尔浓度中强度最低，密度为2150 kg/m，也是最低的。碱激发剂溶液中氢氧化钠浓度较低导致粉煤灰的溶解受限；因此，颗粒间的空隙不能被沉淀的凝胶完全填充。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/1e8622a53184/materials-14-01111-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/3a27de255c81/materials-14-01111-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/0967b288ba11/materials-14-01111-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/0953281373f4/materials-14-01111-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/2e41559ffbb2/materials-14-01111-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/fb853ad58997/materials-14-01111-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/a9dcdb3fe099/materials-14-01111-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/1e8622a53184/materials-14-01111-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/3a27de255c81/materials-14-01111-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/0967b288ba11/materials-14-01111-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/0953281373f4/materials-14-01111-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/2e41559ffbb2/materials-14-01111-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/fb853ad58997/materials-14-01111-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/a9dcdb3fe099/materials-14-01111-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3950/7956834/1e8622a53184/materials-14-01111-g007.jpg

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