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A soft X-ray microscope investigation into the effects of calcium chloride on tricalcium silicate hydration |
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| Authors: | MCG Juenger PJM Monteiro GP Denbeaux |
| Affiliation: | a Department of Civil Engineering, University of Texas, Austin, TX 78712, USA b Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA c Lafarge, Laboratoire Central de Recherche, 38291 St. Quentin Fallavier, France d Center for X-ray Optics, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA 94270, USA |
| Abstract: | Calcium chloride (CaCl2) is one of the most recognized and effective accelerators of hydration, setting, and early strength development in portland cement and tricalcium silicate (C3S) pastes. The mechanisms responsible for this acceleration, as well as the microstructural consequences, are poorly understood. Soft X-ray transmission microscopy has recently been applied to the study of cementitious materials and allows the observation of hydration in situ over time. This technique was applied to the examination of tricalcium silicates hydrating in a solution containing CaCl2. It appears that CaCl2 accelerates the formation of “inner product” calcium silicate hydrate (C-S-H) with a low-density microstructure. |
| Keywords: | Acceleration Hydration Microstructure Admixture Ca3SiO5 |
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