激发剂对基于改性粉煤灰的地质聚合物砂浆力学性能的影响。

Influence of Activators on Mechanical Properties of Modified Fly Ash Based Geopolymer Mortars.

作者信息

Prochon Piotr, Zhao Zengfeng, Courard Luc, Piotrowski Tomasz, Michel Frédéric, Garbacz Andrzej

机构信息

Department of Building Materials Engineering, Faculty of Civil Engineering, Warsaw University of Technology, Armii Ludowej 16, 00-637 Warsaw, Poland.

Urban and Environmental Engineering, Université de Liège, Allée de la découverte 9, Sart Tilman Campus 4000 Liège, Belgium.

出版信息

Materials (Basel). 2020 Feb 25;13(5):1033. doi: 10.3390/ma13051033.

DOI:10.3390/ma13051033

PMID:32106414

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7084247/

Abstract

The aim of this work was to study the influence of the type of activator on the formulation of modified fly ash based geopolymer mortars. Geopolymer and alkali-activated materials (AAM) were made from fly ashes derived from coal and biomass combustion in thermal power plants. Basic activators (NaOH, CaO, and NaSiO) were mixed with fly ashes in order to develop binding properties other than those resulting from the use of Portland cement. The results showed that the mortars with 5 mol/dm of NaOH and 100 g of NaSiO (N5-S22) gave a greater compressive strength than other mixes. The compressive strengths of analyzed fly ash mortars with activators N5-S22 and N5-C10 (5 mol/dm NaOH and 10% CaO) varied from 14.3 MPa to 5.9 MPa. The better properties of alkali-activated mortars with regular fly ash were influenced by a larger amount of amorphous silica and alumina phases. Scanning electron microscopy and calorimetry analysis provided a better understanding of the observed mechanisms.

摘要

这项工作的目的是研究活化剂类型对基于改性粉煤灰的地质聚合物砂浆配方的影响。地质聚合物和碱激活材料（AAM）由热电厂中煤炭和生物质燃烧产生的粉煤灰制成。将碱性活化剂（NaOH、CaO和NaSiO）与粉煤灰混合，以开发出不同于使用波特兰水泥所产生的粘结性能。结果表明，含有5 mol/dm的NaOH和100 g的NaSiO（N5-S22）的砂浆比其他混合物具有更高的抗压强度。含有活化剂N5-S22和N5-C10（5 mol/dm NaOH和10% CaO）的分析粉煤灰砂浆的抗压强度在14.3 MPa至5.9 MPa之间变化。具有普通粉煤灰的碱激活砂浆的较好性能受到大量无定形二氧化硅和氧化铝相的影响。扫描电子显微镜和量热分析有助于更好地理解所观察到的机理。