Portlandite consumption by red ceramic waste due to alkali activation reaction
Red ceramics, due to the low compressive strength and high porosity, make it difficult to use it as an artificial aggregate in the production of mortars and concretes. However, since it has a silicon-rich composition, the ceramic material from blocks and tiles has been studied as a possible suppleme...
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ANTAC - Associação Nacional de Tecnologia do Ambiente Construído
2020
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| Online Access: | https://seer.ufrgs.br/ambienteconstruido/article/view/98137 |
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ojs-article-981372020-12-14T20:31:01Z Portlandite consumption by red ceramic waste due to alkali activation reaction Macioski, Gustavo Soto, Nicolle Talyta Arriagada Medeiros, Marcelo Henrique Farias de Hoppe Filho, Juarez Araújo, Marcia Silva de Cerri, José Alberto Construction and demolition waste; red clay waste; alkali activation; pozzolan activity; porosity Red ceramics, due to the low compressive strength and high porosity, make it difficult to use it as an artificial aggregate in the production of mortars and concretes. However, since it has a silicon-rich composition, the ceramic material from blocks and tiles has been studied as a possible supplementary cementitious material in concrete and also as a raw material in alkali-activated binders. This paper aims to evaluate the content of calcium hydroxide (portlandite) fixed in the alkali activation reaction and the microstructure of red clay waste from construction and demolition waste (CDW) and hydrated lime mixtures, varying the atomic ratio between the silicon and the calcium. The results indicated that higher availability of lime is directly related to the content of hydrated compounds and its porosity. The increase in the silicon/calcium ratio resulted in a reduction of available lime content by 40% and an increase, in volume, of micropores by 7%. ANTAC - Associação Nacional de Tecnologia do Ambiente Construído 2020-12-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://seer.ufrgs.br/ambienteconstruido/article/view/98137 Ambiente Construído; v. 21, n. 1 (2021); 7-21 Ambiente Construído; v. 21, n. 1 (2021); 7-21 Ambiente Construído; v. 21, n. 1 (2021); 7-21 1678-8621 1415-8876 eng https://seer.ufrgs.br/ambienteconstruido/article/view/98137/59543 Direitos autorais 2020 Ambiente Construído https://creativecommons.org/licenses/by/4.0 |
| institution |
Universidade Federal do Rio Grande do Sul |
| collection |
OJS |
| language |
eng |
| format |
Online |
| author |
Macioski, Gustavo Soto, Nicolle Talyta Arriagada Medeiros, Marcelo Henrique Farias de Hoppe Filho, Juarez Araújo, Marcia Silva de Cerri, José Alberto |
| spellingShingle |
Macioski, Gustavo Soto, Nicolle Talyta Arriagada Medeiros, Marcelo Henrique Farias de Hoppe Filho, Juarez Araújo, Marcia Silva de Cerri, José Alberto Portlandite consumption by red ceramic waste due to alkali activation reaction |
| author_facet |
Macioski, Gustavo Soto, Nicolle Talyta Arriagada Medeiros, Marcelo Henrique Farias de Hoppe Filho, Juarez Araújo, Marcia Silva de Cerri, José Alberto |
| author_sort |
Macioski, Gustavo |
| title |
Portlandite consumption by red ceramic waste due to alkali activation reaction |
| title_short |
Portlandite consumption by red ceramic waste due to alkali activation reaction |
| title_full |
Portlandite consumption by red ceramic waste due to alkali activation reaction |
| title_fullStr |
Portlandite consumption by red ceramic waste due to alkali activation reaction |
| title_full_unstemmed |
Portlandite consumption by red ceramic waste due to alkali activation reaction |
| title_sort |
portlandite consumption by red ceramic waste due to alkali activation reaction |
| description |
Red ceramics, due to the low compressive strength and high porosity, make it difficult to use it as an artificial aggregate in the production of mortars and concretes. However, since it has a silicon-rich composition, the ceramic material from blocks and tiles has been studied as a possible supplementary cementitious material in concrete and also as a raw material in alkali-activated binders. This paper aims to evaluate the content of calcium hydroxide (portlandite) fixed in the alkali activation reaction and the microstructure of red clay waste from construction and demolition waste (CDW) and hydrated lime mixtures, varying the atomic ratio between the silicon and the calcium. The results indicated that higher availability of lime is directly related to the content of hydrated compounds and its porosity. The increase in the silicon/calcium ratio resulted in a reduction of available lime content by 40% and an increase, in volume, of micropores by 7%. |
| publisher |
ANTAC - Associação Nacional de Tecnologia do Ambiente Construído |
| publishDate |
2020 |
| url |
https://seer.ufrgs.br/ambienteconstruido/article/view/98137 |
| work_keys_str_mv |
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| _version_ |
1709370661205442560 |