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A platform for research: civil engineering, architecture and urbanism
Sulfate performance of calcined illitic shales
https://orcid.org/0000-0003-4488-0014
Highlights Calcined illitic shales (CIS) shows pozzolanic activity from the age of 14 days. CIS replacement reduces the sulfate expansion in mortars with low w/cm. High reactive CIS allows to control the expansion caused by sulfate attack. High water requirement-CIS controls the expansion at high replacement level. CIS consumes the CH, limiting the ettringite and gypsum formation.
Abstract In the past, calcined pozzolans were largely used in massive concrete, and nowadays, they appear as an excellent alternative to reduce the clinker factor in general use cement. The pozzolanic activity of two calcined illitic shales (CIS) is verified using different standards, indicating the importance of the water requirement for these pozzolans. The sulfate performance of blended cement containing 0, 20, and 40% of CIS was studied with high and low C3A cement using the ASTM C1012 test. Results show that highly reactive CIS is necessary to control the expansion of high C3A-cement at constant w/cm. For low-C3A cement, the highly reactive CIS provides high-sulfate resistant cement with low CIS-replacement, while the water requirement of the other CIS is the main shortcoming to obtain this property. CIS contributes to sulfate resistance due to the CH-consumption and reduction of ions ingress that impedes ettringite and gypsum formation.
Sulfate performance of calcined illitic shales
https://orcid.org/0000-0003-4488-0014
Highlights Calcined illitic shales (CIS) shows pozzolanic activity from the age of 14 days. CIS replacement reduces the sulfate expansion in mortars with low w/cm. High reactive CIS allows to control the expansion caused by sulfate attack. High water requirement-CIS controls the expansion at high replacement level. CIS consumes the CH, limiting the ettringite and gypsum formation.
Abstract In the past, calcined pozzolans were largely used in massive concrete, and nowadays, they appear as an excellent alternative to reduce the clinker factor in general use cement. The pozzolanic activity of two calcined illitic shales (CIS) is verified using different standards, indicating the importance of the water requirement for these pozzolans. The sulfate performance of blended cement containing 0, 20, and 40% of CIS was studied with high and low C3A cement using the ASTM C1012 test. Results show that highly reactive CIS is necessary to control the expansion of high C3A-cement at constant w/cm. For low-C3A cement, the highly reactive CIS provides high-sulfate resistant cement with low CIS-replacement, while the water requirement of the other CIS is the main shortcoming to obtain this property. CIS contributes to sulfate resistance due to the CH-consumption and reduction of ions ingress that impedes ettringite and gypsum formation.
Sulfate performance of calcined illitic shales
https://orcid.org/0000-0003-4488-0014
Highlights Calcined illitic shales (CIS) shows pozzolanic activity from the age of 14 days. CIS replacement reduces the sulfate expansion in mortars with low w/cm. High reactive CIS allows to control the expansion caused by sulfate attack. High water requirement-CIS controls the expansion at high replacement level. CIS consumes the CH, limiting the ettringite and gypsum formation.
Abstract In the past, calcined pozzolans were largely used in massive concrete, and nowadays, they appear as an excellent alternative to reduce the clinker factor in general use cement. The pozzolanic activity of two calcined illitic shales (CIS) is verified using different standards, indicating the importance of the water requirement for these pozzolans. The sulfate performance of blended cement containing 0, 20, and 40% of CIS was studied with high and low C3A cement using the ASTM C1012 test. Results show that highly reactive CIS is necessary to control the expansion of high C3A-cement at constant w/cm. For low-C3A cement, the highly reactive CIS provides high-sulfate resistant cement with low CIS-replacement, while the water requirement of the other CIS is the main shortcoming to obtain this property. CIS contributes to sulfate resistance due to the CH-consumption and reduction of ions ingress that impedes ettringite and gypsum formation.
Sulfate performance of calcined illitic shales
Cordoba, Gisela (author) / Irassar, Edgardo F. (author)
2021-03-30
Article (Journal)
Electronic Resource
English
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