Time-Dependent Shrinkage Model for Recycled Fine Aggregate Thermal Insulation Concrete
In this study, the shrinkage performance of recycled aggregate thermal insulation concrete (RATIC) with added glazed hollow beads (GHB) was investigated and a time-dependent shrinkage model was proposed. Two types of recycled fine aggregate (RFA) were used to replace natural fine aggregate in RATIC:...
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MDPI AG
2021-09-01
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| author | Xuhang Zang Pinghua Zhu Chunhong Chen Xiancui Yan Xinjie Wang |
| author_facet | Xuhang Zang Pinghua Zhu Chunhong Chen Xiancui Yan Xinjie Wang |
| author_sort | Xuhang Zang |
| collection | DOAJ |
| description | In this study, the shrinkage performance of recycled aggregate thermal insulation concrete (RATIC) with added glazed hollow beads (GHB) was investigated and a time-dependent shrinkage model was proposed. Two types of recycled fine aggregate (RFA) were used to replace natural fine aggregate in RATIC: RFA from waste concrete (RFA1) and waste clay brick (RFA2). Besides, the mechanical properties and thermal insulation performance of RATIC were also studied. Results showed that the pozzolanic reaction caused by RFA2 effectively improved the mechanical properties of RATIC; 75% was the optimal replacement ratio of RATIC prepared by RFA2. Added RFA decreased the thermal conductivity of thermal insulation concrete (TIC). The total shrinkage strain of RATIC increased with the increase of the replacement ratio of RFA. The 150d total shrinkage of RATIC prepared by RFA1 was 1.46 times that of TIC and the 150d total shrinkage of RATIC prepared by RFA2 was 1.23 times. The addition of GHBs led to the increase of early total shrinkage strain of concrete. Under the combined action of the higher elastic modulus of RFA2 and the pozzolanic components contained in RFA2, the total shrinkage strain of RATIC prepared by RFA2 with the same replacement ratio was smaller than that of RATIC prepared by RFA1. For example, the final total shrinkage strain of RATIC prepared by RFA2 at 100% replacement ratio was about 18.6% less than that of RATIC prepared by RFA1. A time-dependent shrinkage model considering the influence of the elastic modulus of RFA and the addition of GHB on the total shrinkage of RATIC was proposed and validated by the experimental results. |
| first_indexed | 2024-03-10T06:57:01Z |
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| id | doaj.art-779dae2c04fd4342af6dd50fec0ea9e7 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T06:57:01Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-779dae2c04fd4342af6dd50fec0ea9e72023-11-22T16:23:58ZengMDPI AGMaterials1996-19442021-09-011419558110.3390/ma14195581Time-Dependent Shrinkage Model for Recycled Fine Aggregate Thermal Insulation ConcreteXuhang Zang0Pinghua Zhu1Chunhong Chen2Xiancui Yan3Xinjie Wang4Changzhou City Key Laboratory of Building Energy-Saving Technology, Department of Civil Engineering, Changzhou University, Changzhou 213164, ChinaChangzhou City Key Laboratory of Building Energy-Saving Technology, Department of Civil Engineering, Changzhou University, Changzhou 213164, ChinaChangzhou City Key Laboratory of Building Energy-Saving Technology, Department of Civil Engineering, Changzhou University, Changzhou 213164, ChinaChangzhou City Key Laboratory of Building Energy-Saving Technology, Department of Civil Engineering, Changzhou University, Changzhou 213164, ChinaChangzhou City Key Laboratory of Building Energy-Saving Technology, Department of Civil Engineering, Changzhou University, Changzhou 213164, ChinaIn this study, the shrinkage performance of recycled aggregate thermal insulation concrete (RATIC) with added glazed hollow beads (GHB) was investigated and a time-dependent shrinkage model was proposed. Two types of recycled fine aggregate (RFA) were used to replace natural fine aggregate in RATIC: RFA from waste concrete (RFA1) and waste clay brick (RFA2). Besides, the mechanical properties and thermal insulation performance of RATIC were also studied. Results showed that the pozzolanic reaction caused by RFA2 effectively improved the mechanical properties of RATIC; 75% was the optimal replacement ratio of RATIC prepared by RFA2. Added RFA decreased the thermal conductivity of thermal insulation concrete (TIC). The total shrinkage strain of RATIC increased with the increase of the replacement ratio of RFA. The 150d total shrinkage of RATIC prepared by RFA1 was 1.46 times that of TIC and the 150d total shrinkage of RATIC prepared by RFA2 was 1.23 times. The addition of GHBs led to the increase of early total shrinkage strain of concrete. Under the combined action of the higher elastic modulus of RFA2 and the pozzolanic components contained in RFA2, the total shrinkage strain of RATIC prepared by RFA2 with the same replacement ratio was smaller than that of RATIC prepared by RFA1. For example, the final total shrinkage strain of RATIC prepared by RFA2 at 100% replacement ratio was about 18.6% less than that of RATIC prepared by RFA1. A time-dependent shrinkage model considering the influence of the elastic modulus of RFA and the addition of GHB on the total shrinkage of RATIC was proposed and validated by the experimental results.https://www.mdpi.com/1996-1944/14/19/5581glazed hollow beadrecycled fine aggregaterecycled fine aggregate thermal insulation concretetime-dependent shrinkage modelshrinkage development |
| spellingShingle | Xuhang Zang Pinghua Zhu Chunhong Chen Xiancui Yan Xinjie Wang Time-Dependent Shrinkage Model for Recycled Fine Aggregate Thermal Insulation Concrete Materials glazed hollow bead recycled fine aggregate recycled fine aggregate thermal insulation concrete time-dependent shrinkage model shrinkage development |
| title | Time-Dependent Shrinkage Model for Recycled Fine Aggregate Thermal Insulation Concrete |
| title_full | Time-Dependent Shrinkage Model for Recycled Fine Aggregate Thermal Insulation Concrete |
| title_fullStr | Time-Dependent Shrinkage Model for Recycled Fine Aggregate Thermal Insulation Concrete |
| title_full_unstemmed | Time-Dependent Shrinkage Model for Recycled Fine Aggregate Thermal Insulation Concrete |
| title_short | Time-Dependent Shrinkage Model for Recycled Fine Aggregate Thermal Insulation Concrete |
| title_sort | time dependent shrinkage model for recycled fine aggregate thermal insulation concrete |
| topic | glazed hollow bead recycled fine aggregate recycled fine aggregate thermal insulation concrete time-dependent shrinkage model shrinkage development |
| url | https://www.mdpi.com/1996-1944/14/19/5581 |
| work_keys_str_mv | AT xuhangzang timedependentshrinkagemodelforrecycledfineaggregatethermalinsulationconcrete AT pinghuazhu timedependentshrinkagemodelforrecycledfineaggregatethermalinsulationconcrete AT chunhongchen timedependentshrinkagemodelforrecycledfineaggregatethermalinsulationconcrete AT xiancuiyan timedependentshrinkagemodelforrecycledfineaggregatethermalinsulationconcrete AT xinjiewang timedependentshrinkagemodelforrecycledfineaggregatethermalinsulationconcrete |