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The influence of brick dust and crushed brick on the properties of lime-based mortars exposed at elevated temperatures
Highlights Brick residues (brick dust, crushed brick) have been diachronically used in mortars. Their exploitation enhanced resistance to humidity, decreasing density. The post-fire performance of traditional mortars has to be taken into account. Three mortar series were manufactured and tested (L, LP, LPB) - 40% of natural aggregates was substituted by crushed brick. The 90d post-fire testing age results were more representative - Brick residues enhanced the mortar matrix at extreme temperatures.
Abstract Brick residues, such as brick dust and crushed brick, have been diachronically used in historic mortars, both as binders and aggregates. Their application served as a mean to increase the pozzolanicity of the matrixes, enhancing resistance to humidity, decrease the density of the mixtures and add special hue to the structures. On the other hand, the performance of traditional mortars at elevated temperatures is a significant aspect that should be taken into account, in order to assess the preservation state and residual capacity of historic structures, as well as to design fire resistant restoration materials, under the prism of compatibility. In this study, three mortar series were manufactured, based on lime (L), lime : natural pozzolan (LP-1:1 by weight), lime : natural pozzolan : brick dust (LPB-1:0.8:0.2 by weight). In order to envisage the role of crushed brick in the matrix, they substituted the 40% of natural aggregates in the same gradation (0–8 mm). The physico-mechanical properties of the mortars were tested at 28 and 90 days, while they were further exposed at elevated temperatures, concerning 200 °C, 400 °C, 600 °C, 800 °C and 1000 °C. Their post fire properties (physico-mechanical, microstructural) were recorded, so as to identify the preferable testing age of lime-based mortars and the impact of brick residues on their behavior. From the evaluation of the results, it was asserted that the 90d age seems to be more representative, while crushed brick and brick dust enhanced structural integrity throughout extreme temperatures.
The influence of brick dust and crushed brick on the properties of lime-based mortars exposed at elevated temperatures
Highlights Brick residues (brick dust, crushed brick) have been diachronically used in mortars. Their exploitation enhanced resistance to humidity, decreasing density. The post-fire performance of traditional mortars has to be taken into account. Three mortar series were manufactured and tested (L, LP, LPB) - 40% of natural aggregates was substituted by crushed brick. The 90d post-fire testing age results were more representative - Brick residues enhanced the mortar matrix at extreme temperatures.
Abstract Brick residues, such as brick dust and crushed brick, have been diachronically used in historic mortars, both as binders and aggregates. Their application served as a mean to increase the pozzolanicity of the matrixes, enhancing resistance to humidity, decrease the density of the mixtures and add special hue to the structures. On the other hand, the performance of traditional mortars at elevated temperatures is a significant aspect that should be taken into account, in order to assess the preservation state and residual capacity of historic structures, as well as to design fire resistant restoration materials, under the prism of compatibility. In this study, three mortar series were manufactured, based on lime (L), lime : natural pozzolan (LP-1:1 by weight), lime : natural pozzolan : brick dust (LPB-1:0.8:0.2 by weight). In order to envisage the role of crushed brick in the matrix, they substituted the 40% of natural aggregates in the same gradation (0–8 mm). The physico-mechanical properties of the mortars were tested at 28 and 90 days, while they were further exposed at elevated temperatures, concerning 200 °C, 400 °C, 600 °C, 800 °C and 1000 °C. Their post fire properties (physico-mechanical, microstructural) were recorded, so as to identify the preferable testing age of lime-based mortars and the impact of brick residues on their behavior. From the evaluation of the results, it was asserted that the 90d age seems to be more representative, while crushed brick and brick dust enhanced structural integrity throughout extreme temperatures.
The influence of brick dust and crushed brick on the properties of lime-based mortars exposed at elevated temperatures
Pachta, Vasiliki (author) / Konopisi, Stavroula (author) / Stefanidou, Maria (author)
2021-05-23
Article (Journal)
Electronic Resource
English
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