Valorization of brick waste by alkali-activation: A study on the possible use for masonry repointing
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- 作者：Enrico Sassoni ; enrico.sassoni2@unibo.it" class="auth_mail" title="E-mail the corresponding author ; Parsa Pahlavan ; Elisa Franzoni ; Maria Chiara Bignozzi
- 关键词：Geopolymers ; Ceramic waste ; Sustainability ; SiO2/Al2O3 ratio ; Historic mortars ; Cultural heritage
- 刊名：Ceramics International
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：42
- 期：13
- 页码：14685-14694
- 全文大小：3364 K
文摘
Alkali-activation of brick waste has recently been proposed as a sustainable route to develop pastes/mortars with tailored mechanical properties and pore system. In this study, the suitability of using pastes from brick waste alkali-activation for repointing existing masonries (i.e., filling the most external part of mortar joints, lost due to deterioration processes) was investigated. Five different formulations (having SiO2/Al2O3 molar ratio ranging from 1.4 to 0.4) and two different curing temperatures (room temperature and 50 °C) were investigated. Open porosity and efflorescence formation were found to decrease for decreasing SiO2/Al2O3 ratio. Curing at high temperature generally favored geopolymerization and reduced efflorescence formation. Pastes with SiO2/Al2O3=0.8 and 0.9 exhibited open porosity and water vapor permeability fairly similar to those of historic lime-based mortars, thus proving to be potentially compatible with them. Further optimization of the mix design seems however necessary to reduce the formation of efflorescence.