The fresh and engineering properties of alkali activated slag as a function of fly ash replacement and alkali concentration

NCUIR > Engineering College > Department of Civil Engineering > journal & Dissertation > Item 987654321/100302

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/100302

Title:	The fresh and engineering properties of alkali activated slag as a function of fly ash replacement and alkali concentration
Authors:	王韡蒨;Wang, Wei-Chien;Wang, Her-Yung;Lo, Ming-Hung
Contributors:	工學院土木工程學系
Keywords:	Alkali-activated paste;Analysis;Chemical properties;Compressive strength;Construction materials;Curing;Durability;Energy conservation;Engineering properties;Fly ash;Geopolymer;Recycled material;Slags;Sulfates
Date:	2015-06-01
Issue Date:	2026-04-21 13:56:52 (UTC+8)
Publisher:	Elsevier Ltd.;Elsevier Ltd
Abstract:	摘要： •Under the same conditions increasing alkaline activator besides making the flow time of gerpolymers longer.•The compressive strength of the geopolymer paste increases with age and alkaline solutions, and the optimal compressive strength is 93.06MPa.•The polymerization rate increases with the strongly alkaline solution; therefore, the internal structure is compact and the ultrasonic pulse velocity is increased.•When alkaline activator 0.5% compared to 1.5% is more weight loss, we know higher alkaline activator less prosity, and higher durability relatively is better. Geopolymers are novel, environmentally friendly and economical materials. These materials are produced from industrial wastes, such as fly ash and slag. The geopolymer material used in this study is made from recycled materials, including fly ash and slag, and aqueous solution of NaOH and silicate. All of the specimens are produced using a fixed liquid-to-solid ratio (L/S=0.5), different ratios of fly ash and slag (fly ash replaces slag by 0%, 20%, 40%, and 60%) and various alkaline solutions (0.5%, 1% and 1.5%). The engineering properties of slump, flow, slump flow, flow time, setting time, compressive strength, ultrasonic pulse velocity and anti-sulfate attack are tested at different curing ages 1, 3, 7 and 28days. The findings show that when the replacement of fly ash is fixed, the slump value, flow value and slump flow increase with the alkalinity of the solutions. The slump value (98mm) before replacement with 1.5% alkaline solutions 1.5% is increased by approximately 20mm compared with different replacements of fly ash. Before the addition of any additive with a slow setting effect, the setting time can be shortened by reducing the alkaline solutions. When the alkaline solution increases from 0.5% to 1.0% or 1.5%, the compressive strength quickly develops. The ultrasonic pulse velocity increases with the addition of alkaline solutions. When alkaline activator 0.5% compared to 1.5% of an alkaline activator sulfate, they get more weight loss. The result shows more alkaline activator, less porosity, higher strength, durability relatively is better. These results are expected to upgrade the technical level of slag-based geopolymer with fly ash to further develop Taiwan’s energy saving, carbon reduction and environmentally friendly recycled admixtures. 出版者： Elsevier Ltd 出版日期： 2015-06-01 出處： Construction & building materials, 2015-06, Vol.84, p.224-229 版權： 2015 版權： COPYRIGHT 2015 Elsevier B.V. 識別號： ISSN: 0950-0618 識別號： DOI: 10.1016/j.conbuildmat.2014.09.059
Appears in Collections:	[Department of Civil Engineering] journal & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	10	View/Open

社群 sharing

Loading...