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不同氢氧化钠摩尔浓度在粉煤灰/白云石基地质聚合物上的化学分布

Chemical Distributions of Different Sodium Hydroxide Molarities on Fly Ash/Dolomite-Based Geopolymer.

作者信息

Ibrahim Wan Mastura Wan, Abdullah Mohd Mustafa Al Bakri, Ahmad Romisuhani, Sandu Andrei Victor, Vizureanu Petrica, Benjeddou Omrane, Rahim Afikah, Ibrahim Masdiyana, Sauffi Ahmad Syauqi

机构信息

Faculty of Mechanical Engineering Technology, Universiti Malaysia Perlis (UniMAP), Arau 02600, Perlis, Malaysia.

Center of Excellence Geopolymer & Green Technology (CeGeoGTech), Universiti Malaysia Perlis (UniMAP), Arau 01000, Perlis, Malaysia.

出版信息

Materials (Basel). 2022 Sep 5;15(17):6163. doi: 10.3390/ma15176163.

DOI:10.3390/ma15176163
PMID:36079543
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9457589/
Abstract

Geopolymers are an inorganic material in an alkaline environment that is synthesized with alumina-silica gel. The structure of geopolymers consists of an inorganic chain of material and a covalent-bound molecular system. Currently, Ordinary Portland Cement (OPC) has caused carbon dioxide (CO) emissions which causes greenhouse effects. This analysis investigates the impact on fly ash/dolomite-based-geopolymer with various molarities of sodium hydroxide solutions which are 6 M, 8 M, 10 M, 12 M and 14 M. The samples of fly ash/dolomite-based-geopolymer were prepared with the usage of solid to liquid of 2.0, by mass and alkaline activator ratio of 2.5, by mass. After that, the geopolymer was cast in 50 × 50 × 50 mm molds before testing after 7 days of curing. The samples were tested on compressive strength, density, water absorption, morphology, elemental distributions and phase analysis. From the results, the usage of 8 M of NaOH gave the optimum properties for the fly ash/dolomite-based geopolymer. The elemental distribution analysis exposes the Al, Si, Ca, Fe and Mg chemical distribution of the samples from the selected area. The distribution of the elements is related to the compressive strength and compared with the chemical composition of the fly ash and dolomite.

摘要

地质聚合物是一种在碱性环境中由氧化铝-硅胶合成的无机材料。地质聚合物的结构由无机材料链和共价键合的分子体系组成。目前，普通硅酸盐水泥（OPC）已导致二氧化碳（CO）排放，从而引起温室效应。本分析研究了不同摩尔浓度（6M、8M、10M、12M和14M）的氢氧化钠溶液对粉煤灰/白云石基地质聚合物的影响。粉煤灰/白云石基地质聚合物样品的制备采用固液质量比为2.0，碱性活化剂质量比为2.5。之后，将地质聚合物浇筑到50×50×50mm的模具中，养护7天后进行测试。对样品进行抗压强度、密度、吸水率、形态、元素分布和相分析测试。结果表明，使用8M的NaOH可使粉煤灰/白云石基地质聚合物具有最佳性能。元素分布分析揭示了所选区域样品中Al、Si、Ca、Fe和Mg的化学分布。元素的分布与抗压强度相关，并与粉煤灰和白云石的化学成分进行了比较。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7520/9457589/3fbdc1a2096b/materials-15-06163-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7520/9457589/8cf37e298abb/materials-15-06163-g008.jpg
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