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Phase modification induced drying shrinkage reduction on Na2CO3 activated slag by incorporating Na2SO4
This paper aims to study the phase modification, reaction kinetics, mechanical properties and drying shrinkage of sodium carbonate activated slag by incorporating sodium sulfate in the activator. The results show that the reaction process is firstly controlled by CO3 2− anions, and later runs similar to that of sodium sulfate activation. Besides, the relatively unstable phase gaylussite, commonly found in the sodium carbonate activation, is not observed in the reaction products upon hybrid activation, and monosulfoaluminate rather than ettringite is identified, probably caused by the reduced aluminate-to-sulfate ratio and increased pH value. The drying shrinkage is considerably reduced by up to 41% when replacing 50 wt% sodium carbonate by sodium sulfate, most possibly attributed to the induced phase modification. Furthermore, the relationships between the phase modification and drying shrinkage, and the potentially involved chemical reaction are discussed.
Phase modification induced drying shrinkage reduction on Na2CO3 activated slag by incorporating Na2SO4
This paper aims to study the phase modification, reaction kinetics, mechanical properties and drying shrinkage of sodium carbonate activated slag by incorporating sodium sulfate in the activator. The results show that the reaction process is firstly controlled by CO3 2− anions, and later runs similar to that of sodium sulfate activation. Besides, the relatively unstable phase gaylussite, commonly found in the sodium carbonate activation, is not observed in the reaction products upon hybrid activation, and monosulfoaluminate rather than ettringite is identified, probably caused by the reduced aluminate-to-sulfate ratio and increased pH value. The drying shrinkage is considerably reduced by up to 41% when replacing 50 wt% sodium carbonate by sodium sulfate, most possibly attributed to the induced phase modification. Furthermore, the relationships between the phase modification and drying shrinkage, and the potentially involved chemical reaction are discussed.
Phase modification induced drying shrinkage reduction on Na2CO3 activated slag by incorporating Na2SO4
Yuan, B (author) / Yu, Q L / Brouwers, H J. H
2017
Article (Journal)
English
Operating Procedures, Materials Treatment , Theoretical and Applied Mechanics , Slag , Structural Mechanics , Civil Engineering , Reaction kinetics , Phase modification , Materials Science, general , Compressive strength , Engineering , Drying shrinkage , Sodium carbonate , Building Materials , Sodium sulfate
| Springer Verlag | 2017
| Online Contents | 2017
Time-dependent characterization of Na2CO3 activated slag
| Online Contents | 2017