Effect of Mixed Recycled Aggregate on the Mechanical Strength and Microstructure of Concrete under Different Water Cement Ratios
Mixed recycled aggregate (MRA) is a kind of recycled aggregate containing discarded bricks and other impurities that is inferior to ordinary recycled concrete aggregate. To study the effect of MRA in concrete, specimens with 100% MRA under different water–cement ratios (W/C) of 0.50, 0.42, 0.36 and...
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creator | Meng, Tao Wei, Huadong Yang, Xiufen Zhang, Bo Zhang, Yuncai Zhang, Cungui |
description | Mixed recycled aggregate (MRA) is a kind of recycled aggregate containing discarded bricks and other impurities that is inferior to ordinary recycled concrete aggregate. To study the effect of MRA in concrete, specimens with 100% MRA under different water–cement ratios (W/C) of 0.50, 0.42, 0.36 and 0.30 were prepared, and the mechanical properties and microstructure were tested. Results show that compared with ordinary concrete, the compressive strength of mixed recycled aggregate concrete (MRAC) with the same W/C was reduced by more than 50% at 28 days, but the axial compression ratio was relatively high, reaching over 0.87. Affected by the high water absorption of MRA, the hydration rate of cement slowed, which was beneficial to the long-term development of the properties of MRAC. An appropriate increase in cement content could strengthen MRA and densify the pore structure of MRAC. The research results of this article prove that MRA has high utilization value and could be used to prepare MRAC with application potential using optimal gradation, which is of positive significance for promoting the consumption of construction waste. |
doi_str_mv | 10.3390/ma14102631 |
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To study the effect of MRA in concrete, specimens with 100% MRA under different water–cement ratios (W/C) of 0.50, 0.42, 0.36 and 0.30 were prepared, and the mechanical properties and microstructure were tested. Results show that compared with ordinary concrete, the compressive strength of mixed recycled aggregate concrete (MRAC) with the same W/C was reduced by more than 50% at 28 days, but the axial compression ratio was relatively high, reaching over 0.87. Affected by the high water absorption of MRA, the hydration rate of cement slowed, which was beneficial to the long-term development of the properties of MRAC. An appropriate increase in cement content could strengthen MRA and densify the pore structure of MRAC. The research results of this article prove that MRA has high utilization value and could be used to prepare MRAC with application potential using optimal gradation, which is of positive significance for promoting the consumption of construction waste.</description><identifier>ISSN: 1996-1944</identifier><identifier>EISSN: 1996-1944</identifier><identifier>DOI: 10.3390/ma14102631</identifier><identifier>PMID: 34069947</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Axial compression ; Cement ; Compression ratio ; Compressive strength ; Concrete aggregates ; Concrete construction ; Concrete mixing ; Construction materials ; Mechanical properties ; Microstructure ; Particle size ; Porous materials ; Tensile strength ; Water absorption ; Water-cement ratio</subject><ispartof>Materials, 2021-05, Vol.14 (10), p.2631</ispartof><rights>2021 by the authors. 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/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>2021 by the authors. 2021</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c383t-403061d58768f6ab403f8a318ad81dc6dca636208d5165046871b3d5d5ab3dc73</citedby><cites>FETCH-LOGICAL-c383t-403061d58768f6ab403f8a318ad81dc6dca636208d5165046871b3d5d5ab3dc73</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC8157601/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC8157601/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,314,727,780,784,885,27924,27925,53791,53793</link.rule.ids></links><search><creatorcontrib>Meng, Tao</creatorcontrib><creatorcontrib>Wei, Huadong</creatorcontrib><creatorcontrib>Yang, Xiufen</creatorcontrib><creatorcontrib>Zhang, Bo</creatorcontrib><creatorcontrib>Zhang, Yuncai</creatorcontrib><creatorcontrib>Zhang, Cungui</creatorcontrib><title>Effect of Mixed Recycled Aggregate on the Mechanical Strength and Microstructure of Concrete under Different Water Cement Ratios</title><title>Materials</title><description>Mixed recycled aggregate (MRA) is a kind of recycled aggregate containing discarded bricks and other impurities that is inferior to ordinary recycled concrete aggregate. To study the effect of MRA in concrete, specimens with 100% MRA under different water–cement ratios (W/C) of 0.50, 0.42, 0.36 and 0.30 were prepared, and the mechanical properties and microstructure were tested. Results show that compared with ordinary concrete, the compressive strength of mixed recycled aggregate concrete (MRAC) with the same W/C was reduced by more than 50% at 28 days, but the axial compression ratio was relatively high, reaching over 0.87. Affected by the high water absorption of MRA, the hydration rate of cement slowed, which was beneficial to the long-term development of the properties of MRAC. An appropriate increase in cement content could strengthen MRA and densify the pore structure of MRAC. The research results of this article prove that MRA has high utilization value and could be used to prepare MRAC with application potential using optimal gradation, which is of positive significance for promoting the consumption of construction waste.</description><subject>Axial compression</subject><subject>Cement</subject><subject>Compression ratio</subject><subject>Compressive strength</subject><subject>Concrete aggregates</subject><subject>Concrete construction</subject><subject>Concrete mixing</subject><subject>Construction materials</subject><subject>Mechanical properties</subject><subject>Microstructure</subject><subject>Particle size</subject><subject>Porous materials</subject><subject>Tensile strength</subject><subject>Water absorption</subject><subject>Water-cement ratio</subject><issn>1996-1944</issn><issn>1996-1944</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNpdUVFLHDEQDqVSRe-lvyDQFylcTTbZbPalcFzVCifCaeljyCWzeyu7yZlki775081yUlvnZWbI9335Zgahz5R8Y6wmZ4OmnJJCMPoBHdG6FnNac_7xn_oQzWK8JzkYo7KoP6FDxomoa14doefzpgGTsG_wdfcIFq_BPJk-F4u2DdDqBNg7nLaAr8FsteuM7vFtCuDatMXa2cwzwccURpPGAJPS0jsTIDNHZyHgH13-IxMS_p3lAl7CMDVrnTofT9BBo_sIs9d8jH5dnN8tf85XN5dXy8Vqbphkac4JI4LaUlZCNkJvct9InefRVlJrhDVaMFEQaUsqSsKFrOiG2dKWOidTsWP0fa-7GzcDWJMdBN2rXegGHZ6U1536_8V1W9X6P0rSshKEZoHTV4HgH0aISQ1dNND32oEfoypKJrjMFsoM_fIOeu_H4PJ4E6oQglecZ9TXPWpaXwzQ_DVDiZpuq95uy14A2siVmg</recordid><startdate>20210518</startdate><enddate>20210518</enddate><creator>Meng, Tao</creator><creator>Wei, Huadong</creator><creator>Yang, Xiufen</creator><creator>Zhang, Bo</creator><creator>Zhang, Yuncai</creator><creator>Zhang, Cungui</creator><general>MDPI AG</general><general>MDPI</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>KB.</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>7X8</scope><scope>5PM</scope></search><sort><creationdate>20210518</creationdate><title>Effect of Mixed Recycled Aggregate on the Mechanical Strength and Microstructure of Concrete under Different Water Cement Ratios</title><author>Meng, Tao ; 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To study the effect of MRA in concrete, specimens with 100% MRA under different water–cement ratios (W/C) of 0.50, 0.42, 0.36 and 0.30 were prepared, and the mechanical properties and microstructure were tested. Results show that compared with ordinary concrete, the compressive strength of mixed recycled aggregate concrete (MRAC) with the same W/C was reduced by more than 50% at 28 days, but the axial compression ratio was relatively high, reaching over 0.87. Affected by the high water absorption of MRA, the hydration rate of cement slowed, which was beneficial to the long-term development of the properties of MRAC. An appropriate increase in cement content could strengthen MRA and densify the pore structure of MRAC. The research results of this article prove that MRA has high utilization value and could be used to prepare MRAC with application potential using optimal gradation, which is of positive significance for promoting the consumption of construction waste.</abstract><cop>Basel</cop><pub>MDPI AG</pub><pmid>34069947</pmid><doi>10.3390/ma14102631</doi><oa>free_for_read</oa></addata></record> |
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subjects | Axial compression Cement Compression ratio Compressive strength Concrete aggregates Concrete construction Concrete mixing Construction materials Mechanical properties Microstructure Particle size Porous materials Tensile strength Water absorption Water-cement ratio |
title | Effect of Mixed Recycled Aggregate on the Mechanical Strength and Microstructure of Concrete under Different Water Cement Ratios |
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