Valorization of construction and demolition (C&D) and industrial wastes through alkali activation

被引：118

作者：

Zaharaki, Dimitra ^{[1
]}

Galetakis, Michalis ^{[1
]}

Komnitsas, Kostas ^{[1
]}

机构：

[1] Tech Univ Crete, Sch Mineral Resources Engn, Univ Campus, Khania 73100, Greece

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2016年 / 121卷

关键词：

Alkali activation; Geopolymer; Slag; Construction and demolition wastes; Red mud; FLY-ASH; MECHANICAL-PROPERTIES; COMPRESSIVE STRENGTH; GEOPOLYMER MORTAR; PORTLAND-CEMENT; SLAG; CONCRETE; MICROSTRUCTURE; BEHAVIOR; IMMOBILIZATION;

D O I：

10.1016/j.conbuildmat.2016.06.051

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

In the present experimental study, the valorization of construction and demolition (C&D) and industrial wastes, namely ferronickel slag and red mud, through alkali activation is investigated. Specimens were produced by mixing various proportions of the raw materials with NaOH and sodium silicate solutions. The paste was cast in cubic metal moulds with an edge of 5 cm, cured at 80 degrees C for 24 h and then aged for 7 days at room temperature. The produced specimens were subjected to compressive strength testing. The effect of the molarity of the activating solution, the mineralogy of the raw materials and the ratios of SiO2/Al2O3 and SiO2/(Al2O3 + CaO) on the compressive strength of the final products was investigated. Also, the effect of high temperature heating (400-800 degrees C) on the structural integrity, of the produced specimens was assessed. The use of analytical techniques, namely.X-ray diffraction, Thermogravimetric Analysis, Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy provided insights on the morphology, structure and thermal resistance of the produced specimens. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：686 / 693

页数：8

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