Behavior of metakaolin-based potassium geopolymers in acidic solutions

被引：49

作者：

Gao, X. X. ^{[1
]}

Michaud, P. ^{[1
]}

Joussein, E. ^{[2
]}

Rossignol, S. ^{[1
]}

机构：

[1] CEC GEMH ENSCI, Grp Etude Mat Heterogenes, F-87068 Limoges, France

[2] Univ Limoges, GRESE, EA 4330, F-87060 Limoges, France

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2013年 / 380卷

关键词：

Geopolymer; Metakaolin; Acid resistance; Degradation mechanism; Carbonate species; Composition; HARDENED PASTE; CEMENTS; ATTACK; DURABILITY;

D O I：

10.1016/j.jnoncrysol.2013.09.002

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This work studies the behavior of a metakaolin-based potassium geopolymer immersed in HCI solution (pH = 2). The polymer was attacked in three different ways to determine the effects of the immersion time, successive acid attack and the SN value (sample mass/volume of solution) on the released elements and on pH. XRD, SEM and compressive strength studies showed that the basic geopolymer network remains intact regardless of the attack method. pH monitoring and FTIR demonstrated the existence of KHCO3 and K2CO3, likely resulting from the excessive KOH after the geopolymer samples react with atmospheric CO2. These basic species were considered the main products of the initial immersion in HCI solutions. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：95 / 102

页数：8

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