Cargando…

Quantitative Analysis of Surface Attached Mortar for Recycled Coarse Aggregate

Due to the large amount of old hardened cement mortar attached to the surface of aggregate and the internal micro-cracks formed by the crushing process, the water absorption, apparent density, and crushing index of recycled coarse aggregate are still far behind those of natural coarse aggregate. Bas...

Descripción completa

Detalles Bibliográficos
Autores principales: Liu, Guoying, Li, Qiuyi, Song, Jialin, Wang, Liang, Liu, Haibao, Guo, Yuanxin, Yue, Gongbing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8745909/
https://www.ncbi.nlm.nih.gov/pubmed/35009403
http://dx.doi.org/10.3390/ma15010257
_version_ 1784630459224817664
author Liu, Guoying
Li, Qiuyi
Song, Jialin
Wang, Liang
Liu, Haibao
Guo, Yuanxin
Yue, Gongbing
author_facet Liu, Guoying
Li, Qiuyi
Song, Jialin
Wang, Liang
Liu, Haibao
Guo, Yuanxin
Yue, Gongbing
author_sort Liu, Guoying
collection PubMed
description Due to the large amount of old hardened cement mortar attached to the surface of aggregate and the internal micro-cracks formed by the crushing process, the water absorption, apparent density, and crushing index of recycled coarse aggregate are still far behind those of natural coarse aggregate. Based on the performance requirements of different qualities of recycled coarse aggregate, the performance differences of recycled coarse aggregate before and after physical strengthening were observed. The results showed that the physical strengthening technique can remove old hardened mortar and micro powder attached to the surface of recycled coarse aggregate by mechanical action, which can effectively improve the quality of recycled coarse aggregate. The optimum calcination temperature of the recycled coarse aggregate was 400 °C and the grinding time was 20 min. The contents of the attached mortar in recycled coarse aggregates of Class I, II, and III were 7.9%, 22.8%, and 39.7%, respectively. The quality of recycled coarse aggregate was closely related to the amount of mortar attached to the surface. The higher the mortar content, the higher the water absorption, lower apparent density, and higher crushing index of the recycled coarse aggregate.
format Online
Article
Text
id pubmed-8745909
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-87459092022-01-11 Quantitative Analysis of Surface Attached Mortar for Recycled Coarse Aggregate Liu, Guoying Li, Qiuyi Song, Jialin Wang, Liang Liu, Haibao Guo, Yuanxin Yue, Gongbing Materials (Basel) Article Due to the large amount of old hardened cement mortar attached to the surface of aggregate and the internal micro-cracks formed by the crushing process, the water absorption, apparent density, and crushing index of recycled coarse aggregate are still far behind those of natural coarse aggregate. Based on the performance requirements of different qualities of recycled coarse aggregate, the performance differences of recycled coarse aggregate before and after physical strengthening were observed. The results showed that the physical strengthening technique can remove old hardened mortar and micro powder attached to the surface of recycled coarse aggregate by mechanical action, which can effectively improve the quality of recycled coarse aggregate. The optimum calcination temperature of the recycled coarse aggregate was 400 °C and the grinding time was 20 min. The contents of the attached mortar in recycled coarse aggregates of Class I, II, and III were 7.9%, 22.8%, and 39.7%, respectively. The quality of recycled coarse aggregate was closely related to the amount of mortar attached to the surface. The higher the mortar content, the higher the water absorption, lower apparent density, and higher crushing index of the recycled coarse aggregate. MDPI 2021-12-30 /pmc/articles/PMC8745909/ /pubmed/35009403 http://dx.doi.org/10.3390/ma15010257 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Liu, Guoying
Li, Qiuyi
Song, Jialin
Wang, Liang
Liu, Haibao
Guo, Yuanxin
Yue, Gongbing
Quantitative Analysis of Surface Attached Mortar for Recycled Coarse Aggregate
title Quantitative Analysis of Surface Attached Mortar for Recycled Coarse Aggregate
title_full Quantitative Analysis of Surface Attached Mortar for Recycled Coarse Aggregate
title_fullStr Quantitative Analysis of Surface Attached Mortar for Recycled Coarse Aggregate
title_full_unstemmed Quantitative Analysis of Surface Attached Mortar for Recycled Coarse Aggregate
title_short Quantitative Analysis of Surface Attached Mortar for Recycled Coarse Aggregate
title_sort quantitative analysis of surface attached mortar for recycled coarse aggregate
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8745909/
https://www.ncbi.nlm.nih.gov/pubmed/35009403
http://dx.doi.org/10.3390/ma15010257
work_keys_str_mv AT liuguoying quantitativeanalysisofsurfaceattachedmortarforrecycledcoarseaggregate
AT liqiuyi quantitativeanalysisofsurfaceattachedmortarforrecycledcoarseaggregate
AT songjialin quantitativeanalysisofsurfaceattachedmortarforrecycledcoarseaggregate
AT wangliang quantitativeanalysisofsurfaceattachedmortarforrecycledcoarseaggregate
AT liuhaibao quantitativeanalysisofsurfaceattachedmortarforrecycledcoarseaggregate
AT guoyuanxin quantitativeanalysisofsurfaceattachedmortarforrecycledcoarseaggregate
AT yuegongbing quantitativeanalysisofsurfaceattachedmortarforrecycledcoarseaggregate