Experimental study of self-leveling mortars produced with recycled concrete aggregates
This study evaluates the use of recycled concrete aggregate (RCA) in self-leveling mortars (SLM) to obtain certain rheological characteristics for use in screed concrete. Mixtures were produced with 50% and 75% of RCA in substitution of natural fine aggregate (NFA) by varying the type of additive (p...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-12-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509522004260 |
| _version_ | 1817977140271906816 |
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| author | Thais Valadares Oliveira Luciana de Nazaré Pinheiro Cordeiro Sofia Araújo Lima Bessa |
| author_facet | Thais Valadares Oliveira Luciana de Nazaré Pinheiro Cordeiro Sofia Araújo Lima Bessa |
| author_sort | Thais Valadares Oliveira |
| collection | DOAJ |
| description | This study evaluates the use of recycled concrete aggregate (RCA) in self-leveling mortars (SLM) to obtain certain rheological characteristics for use in screed concrete. Mixtures were produced with 50% and 75% of RCA in substitution of natural fine aggregate (NFA) by varying the type of additive (polyfunctional plasticizer and combination of superplasticizer and viscosity modifier). In order to achieve a better distribution of water amid the grains in the residue, the RCA was pre-wetted by spraying for 10 min before mixing. The properties evaluated were: specific mass in the fresh stage, tensile strength, spreading, flow retention, regeneration time, and exudation rate. Regarding the variation of the type of chemical additive, all the mixtures had valid rheological aspects. The exudation rate values were less than 3% and the minimum curing time was 15 min. Also, all mortars achieved values above 2 MPa in the flexural strength tests, which was the minimum expected according to the literature. The use of RCA can be considered, and through the proper adjustments of chemical additives it can provide formulations with adequate rheological characteristics without losses on their mechanical properties. |
| first_indexed | 2024-04-13T22:13:10Z |
| format | Article |
| id | doaj.art-da5d76f9e204419e952928bc3d218a63 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-04-13T22:13:10Z |
| publishDate | 2022-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-da5d76f9e204419e952928bc3d218a632022-12-22T02:27:40ZengElsevierCase Studies in Construction Materials2214-50952022-12-0117e01294Experimental study of self-leveling mortars produced with recycled concrete aggregatesThais Valadares Oliveira0Luciana de Nazaré Pinheiro Cordeiro1Sofia Araújo Lima Bessa2School of Civil Engineering, Institute of Technology, Federal University of Pará, 01 Augusto Correa St, Guamá, 66075-110, Belém, Pará, BrazilSchool of Civil Engineering, Institute of Technology, Federal University of Pará, 01 Augusto Correa St, Guamá, 66075-110, Belém, Pará, Brazil; Corresponding author.School of Architecture, Federal University of Minas Gerais, 697 Paraiba St, Savassi, Belo Horizonte, MG, 30130-141, BrazilThis study evaluates the use of recycled concrete aggregate (RCA) in self-leveling mortars (SLM) to obtain certain rheological characteristics for use in screed concrete. Mixtures were produced with 50% and 75% of RCA in substitution of natural fine aggregate (NFA) by varying the type of additive (polyfunctional plasticizer and combination of superplasticizer and viscosity modifier). In order to achieve a better distribution of water amid the grains in the residue, the RCA was pre-wetted by spraying for 10 min before mixing. The properties evaluated were: specific mass in the fresh stage, tensile strength, spreading, flow retention, regeneration time, and exudation rate. Regarding the variation of the type of chemical additive, all the mixtures had valid rheological aspects. The exudation rate values were less than 3% and the minimum curing time was 15 min. Also, all mortars achieved values above 2 MPa in the flexural strength tests, which was the minimum expected according to the literature. The use of RCA can be considered, and through the proper adjustments of chemical additives it can provide formulations with adequate rheological characteristics without losses on their mechanical properties.http://www.sciencedirect.com/science/article/pii/S2214509522004260Self-leveling mortarConcrete wasteChemical additivesFresh stage |
| spellingShingle | Thais Valadares Oliveira Luciana de Nazaré Pinheiro Cordeiro Sofia Araújo Lima Bessa Experimental study of self-leveling mortars produced with recycled concrete aggregates Case Studies in Construction Materials Self-leveling mortar Concrete waste Chemical additives Fresh stage |
| title | Experimental study of self-leveling mortars produced with recycled concrete aggregates |
| title_full | Experimental study of self-leveling mortars produced with recycled concrete aggregates |
| title_fullStr | Experimental study of self-leveling mortars produced with recycled concrete aggregates |
| title_full_unstemmed | Experimental study of self-leveling mortars produced with recycled concrete aggregates |
| title_short | Experimental study of self-leveling mortars produced with recycled concrete aggregates |
| title_sort | experimental study of self leveling mortars produced with recycled concrete aggregates |
| topic | Self-leveling mortar Concrete waste Chemical additives Fresh stage |
| url | http://www.sciencedirect.com/science/article/pii/S2214509522004260 |
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