| Title | Binary Cements with High Coal Waste Contents: Properties and Behaviour Against CO2 |
|---|---|
| ID_Doc | 12662 |
| Authors | Frías, M; García, L; Caneda-Martínez, L; de Rojas, MIS; García, R; Vigil, R; Vegas, I; Martínez-Ramírez, S |
| Title | Binary Cements with High Coal Waste Contents: Properties and Behaviour Against CO2 |
| Year | 2018 |
| Published | |
| Abstract | It is well known that there are several scientific, technical and environmental advantages of incorporating active additions to the cement, due to its ability to react chemically with the portlandite generated during the hydration reaction of the cement particles, to give more dense and compact matrices. The coal wastes are an alternative source of obtaining future ecological pozzolans, fundamental pillar of the main strategy of the Circular Economy. As a result, an improvement in the blended cement performances was obtained. However, some aspects regarding the durability due to CO2 reaction have not been solved. A wide range of pozzolans (silica fume, fly ash, natural pozzolan, natural metakaolinite) are found in kaolinite-based industrial wastes (paper waste, potable water treatment), which are an excellent alternative for the socio-economic development of a country. The current work presents the scientific-technical advances of coal wastes as supplementary cementing material for the manufacture of low clinker cements and their influence under the action of CO2. The obtained results show that, after thermal activation, the products obtained have a high pozzolanic activity in the range of 550 and 650 degrees C and the kinetics reaction is similar to other pozzolans of silico-aluminous nature. After exposure to CO2 environment, the behaviour of the pozzolanic material is similar to cement, used as reference, when the percentage of substitution is low; while the 50% blended cements showed a rapid carbonation process. |
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