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Assessment and prediction of the mechanical properties of ternary geopolymer concrete

Frontiers of Structural and Civil Engineering 2022年第11期16卷 1436-1452页

作者： Jinliang LIU Wei ZHAO Xincheng SU Xuefeng XIE School of Civil Engineering Northeast Forestry UniversityHarbin 150040China

This paper utilized granulated blast furnace slag(GBFS),fly ash(FA),and zeolite powder(ZP)as the binders of ternary geopolymer concrete(TGC)activated with sodium silicate *** effects of alkali content(AC)and alkaline activator modulus(AAM)on the compressive strength,flexural tensile strength and elastic modulus of TGC were tested and the SEM micrographs were *** experimental results were then compared with the predictions based on models of mechanical properties,and the amended models of TGC were proposed taking account of the effects of AC and *** results indicated that increasing AC and reducing AAM which were in the specific ranges(5%to 7%and 1.1 to 1.5,respectively)had positive effects on the mechanical properties of *** addition,the flexural tensile strength of TGC was 27.7%higher than that of OPC at the same compressive strength,while the elastic modulus of TGC was 25.8%lower than that of *** prediction models with the R2 of 0.945 and 0.987 for predicting flexural tensile strength and elastic modulus using compressive strength,respectively,were *** models,considering the effects of AC and AAM,were also proposed to predict the mechanical properties of TGC.

关键词： Ternary Geopolymer Concrete(TGC) alkaline activator modulus alkali content mechanical properties assessment

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The Mechanism of Ground Granulated Blastfurnace Slag Preventing alkali Aggregate Reaction

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Journal of Wuhan University of Technology(Materials Science) 2010年第2期25卷 332-341页

作者： STARK Jochen FREYBURG Ernst F A Finger-Institute for Building Material Science of Bauhaus-University Weimar

Three different methods were applied to study the alkali content of gelpores in cement. In the closed system, the concentration of K＋, Na＋ and OH - have not reduced with the increase of age. In the open system, the diffusion and transferring of K＋ and Na＋ towards free space leads to the de-crease of total alkali content. In the micro-analysis system, the contents of K＋ and Na＋ in the first hy- drated layer of ground granulated blastfurnace slag （GBFS） are very low, while the contents of calcium and magnesium are relatively high. This phenomenon shows that the mechanism of GBFS preventing alkali aggregate reaction （AAR） is： when GBFS is dissolved by alkali medium, SiO2 and Al2O3 are dissolved into the cement matrix, then around GBFS particles form reaction rings rich in Ca2＋ and Mg^2＋, and the C-S-H gel of positive charges formed in the area repulses K＋ and Na＋, which are forced to transfer to the mortar＇s matrix, pore or mortar sample surface. The transferred K ^＋ and Na^＋ form alkali gel products with other dissolved ions, then become evenly distributed in the mortar sample and react with Ca（OH）2 in pore solutions to form （Na,K）x-2z·zCa·（SiO2）y·（OH）x gel products; and thus changes the AAR gel products＇ structure. The gel products will not expand, and so they can delay expansion destruction.

关键词： granulated blastfurnace slag (GBFS) alkali aggregate reaction (AAR) alkali content preventing mechanism

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