Abstract
This work aims to clarify the influence of potassium hydroxide and sulfate on the hydration progress of tricalcium silicate (C3S) from pore solution and solid phase aspect. The early hydration of plain system and C3S with alkalis was tested by several prevalent techniques. Results show that KOH renders the absence of induction period and enhances hydration at acceleration period. K2SO4 has higher enhancement of hydration at acceleration period. KOH could increase the supersaturation of portlandite in pore solution expediting the nucleation and growth of portlandite but SO42− in solution hampers the nucleates of portlandite. Portlandite rarely precipitates at induction period. Instead a few C–S–H precipitates at the induction period. Potassium hydroxide and sulfate decrease the critical supersaturation needing for nucleation of C–S–H. In addition, alkalis make impact on the morphology of hydration products which will influence its precipitation and growth.
Published Version
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