Effects of fly ash and lithium compounds on the water-soluble alkali and lithium content of cement specimens

NCUIR > Engineering College > Department of Civil Engineering > journal & Dissertation > Item 987654321/99901

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/99901

Title:	Effects of fly ash and lithium compounds on the water-soluble alkali and lithium content of cement specimens
Authors:	王韡蒨;Wang, Wei Chien
Contributors:	工學院土木工程學系
Keywords:	Alkali;Analysis;Cement;Concrete;Fly ash;Lithium;Lithium compounds;Paste;Properties
Date:	2014-01-01
Issue Date:	2026-04-21 13:40:33 (UTC+8)
Publisher:	Elsevier Ltd.;Elsevier Ltd
Abstract:	摘要： •The alkali content of fly ash is originally non-water-soluble.•The alkali content of fly ash gradually becomes water-soluble during the cement hydration process.•Lithium compounds could increase the water-soluble alkali concentration in cement specimen.•ASR inhibition performance of LiNO3 is than that of LiOH addition. This study uses fly ash to replace partial cement. NaOH is used to increase alkali content of cement to 1.0% Na2Oeq. LiOH and LiNO3 are added separately to obtain several Li/(Na+K) molar ratios to fabricate cement specimens cured at 38°C in a 100% relative humidity environment. This study aims to observe the diachronic changes of water-soluble alkali and lithium content in specimens to understand the potential damaging effect of alkali–silica reaction by adding fly ash and lithium compounds simultaneously. Results indicate that the alkali content of fly ash is originally non-water-soluble, but it gradually becomes water-soluble during the hydration process. When lithium compounds are not added, an increase in cement alkali content increases both the amount and the ratio of water-soluble alkali in the specimens. Given the same curing time, when lithium compounds are added to cement, the ratio of water-soluble lithium content is higher than that of water-soluble alkali content. Therefore, water-soluble Li/(Na+K) molar ratio becomes higher than the original value. Furthermore, LiNO3 addition exhibits better performance in increasing water-soluble Li/(Na+K) molar ratio compared with LiOH addition. 出版者： Elsevier Ltd 出版日期： 2014 出處： Construction & building materials, 2014, Vol.50, p.727-735 版權： 2013 Elsevier Ltd 版權： COPYRIGHT 2014 Elsevier B.V. 識別號： ISSN: 0950-0618 識別號： DOI: 10.1016/j.conbuildmat.2013.10.024
Appears in Collections:	[Department of Civil Engineering] journal & Dissertation

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