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Hydration reaction and hardening of calcined clays and related minerals. IV. Experimental conditions for strength improvement on metakaolinite minicylinders
AbstractFor metakaolinite cements activated by calcium hydroxide, the more convenient curing process to optimize 28 days compressive strengths on pure paste minicylinders was defined as follows: samples are removed from the molds at 7 days, then cured in liquid water and tested after drying for one day at 50°C. In such conditions, strength values, which are about 10% lower than those measured on 4×4×16cm standardized prisms cured in the same way, become optimal with a metakaolinite/calcium hydroxide ratio of 3. They attain 26–27 MPa and 32–33 MPa when samples are gauged at normal consistency and at the limit of workability, respectively. The strength improvement depends on the nature of hydrates which form during the hardening, then on the curing process. It is essentially correlated to CSHI formation during the hydration reaction, the correlation becoming linear only at ages higher than 28 days. In one other hand, the hydration of metakaolinite with chemical activators other than hydrated lime (calcite, gypsum) has been investigated without any success.
Hydration reaction and hardening of calcined clays and related minerals. IV. Experimental conditions for strength improvement on metakaolinite minicylinders
AbstractFor metakaolinite cements activated by calcium hydroxide, the more convenient curing process to optimize 28 days compressive strengths on pure paste minicylinders was defined as follows: samples are removed from the molds at 7 days, then cured in liquid water and tested after drying for one day at 50°C. In such conditions, strength values, which are about 10% lower than those measured on 4×4×16cm standardized prisms cured in the same way, become optimal with a metakaolinite/calcium hydroxide ratio of 3. They attain 26–27 MPa and 32–33 MPa when samples are gauged at normal consistency and at the limit of workability, respectively. The strength improvement depends on the nature of hydrates which form during the hardening, then on the curing process. It is essentially correlated to CSHI formation during the hydration reaction, the correlation becoming linear only at ages higher than 28 days. In one other hand, the hydration of metakaolinite with chemical activators other than hydrated lime (calcite, gypsum) has been investigated without any success.
Hydration reaction and hardening of calcined clays and related minerals. IV. Experimental conditions for strength improvement on metakaolinite minicylinders
Ambroise, J. (author) / Murat, M. (author) / Pera, J. (author)
Cement and Concrete Research ; 15 ; 83-88
1984-05-03
6 pages
Article (Journal)
Electronic Resource
English
Hydration reaction and hardening of calcined clays and related minerals.
| Elsevier | 1982
Kaolinitic calcined clays – Portland cement system: Hydration and properties
| Online Contents | 2014