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Self-healing capability of engineered cementitious composites with calcium aluminate cement
https://orcid.org/0000-0003-1217-107X
https://orcid.org/0000-0001-9453-8394
Highlights The self-healing characteristics of CAC-ECCs without and with fly ash were thoroughly investigated. The use of CAC in ECC permitted to reach greater mechanical strengths at early ages. The cracking performance are affected negatively by use of CAC in ECC. CAC-ECC without fly ash addition was the most optimal composition that achieved greater self-healing properties. The microstructural study approved the conversion of hydrates, without a noticeable effect on the self-healing results.
Abstract The reduced heating temperatures required for producing calcium aluminate cement (CAC) make it highly suitable for reducing CO2 emissions in engineered cementitious composites (ECCs) known with their significant amount of cement. However, it is not clear to what extent this can influence the advanced mechanical and self-healing ability of control ECC, especially with the risk of conversion in CAC reaction products. This study investigates the self-healing capability of ECCs produced using CAC instead of conventional ordinary Portland cement (OPC). It also assesses the impact of incorporating fly ash (FA) into CAC-ECC blends at different FA/CAC ratios. In addition to the mechanical characterisation of sound specimens, flexural properties, cracking behavior, ultra-sonic pulse velocity (UPV) and rapid chloride permeability test (RCPT) were performed on preloaded OPC- and CAC-ECCs. The study also analyzed the microstructural changes of self-healing products associated with the high alumina content of CAC. The results show that CAC can be used to produce high mechanical strengths ECCs, with more than 34% and 7% higher compressive and flexural strengths respectively than those of ECC-CTL at early age, though the addition of FA was important to reach improved patterns of mechanical properties at advanced ages. In addition, significant improvements were recorded for the recovery rates of CAC-ECCs, reaching more than 29% for flexural strengths, 11% for UPV and 75% for RCPT than the ECC-CTL. The self-healing products characterized with SEM-EDS confirmed the occurrence of conversion when FA was not included in CAC-ECCs, nevertheless with limited effect on the self-healing efficiency of these mixtures.
Self-healing capability of engineered cementitious composites with calcium aluminate cement
https://orcid.org/0000-0003-1217-107X
https://orcid.org/0000-0001-9453-8394
Highlights The self-healing characteristics of CAC-ECCs without and with fly ash were thoroughly investigated. The use of CAC in ECC permitted to reach greater mechanical strengths at early ages. The cracking performance are affected negatively by use of CAC in ECC. CAC-ECC without fly ash addition was the most optimal composition that achieved greater self-healing properties. The microstructural study approved the conversion of hydrates, without a noticeable effect on the self-healing results.
Abstract The reduced heating temperatures required for producing calcium aluminate cement (CAC) make it highly suitable for reducing CO2 emissions in engineered cementitious composites (ECCs) known with their significant amount of cement. However, it is not clear to what extent this can influence the advanced mechanical and self-healing ability of control ECC, especially with the risk of conversion in CAC reaction products. This study investigates the self-healing capability of ECCs produced using CAC instead of conventional ordinary Portland cement (OPC). It also assesses the impact of incorporating fly ash (FA) into CAC-ECC blends at different FA/CAC ratios. In addition to the mechanical characterisation of sound specimens, flexural properties, cracking behavior, ultra-sonic pulse velocity (UPV) and rapid chloride permeability test (RCPT) were performed on preloaded OPC- and CAC-ECCs. The study also analyzed the microstructural changes of self-healing products associated with the high alumina content of CAC. The results show that CAC can be used to produce high mechanical strengths ECCs, with more than 34% and 7% higher compressive and flexural strengths respectively than those of ECC-CTL at early age, though the addition of FA was important to reach improved patterns of mechanical properties at advanced ages. In addition, significant improvements were recorded for the recovery rates of CAC-ECCs, reaching more than 29% for flexural strengths, 11% for UPV and 75% for RCPT than the ECC-CTL. The self-healing products characterized with SEM-EDS confirmed the occurrence of conversion when FA was not included in CAC-ECCs, nevertheless with limited effect on the self-healing efficiency of these mixtures.
Self-healing capability of engineered cementitious composites with calcium aluminate cement
https://orcid.org/0000-0003-1217-107X
https://orcid.org/0000-0001-9453-8394
Highlights The self-healing characteristics of CAC-ECCs without and with fly ash were thoroughly investigated. The use of CAC in ECC permitted to reach greater mechanical strengths at early ages. The cracking performance are affected negatively by use of CAC in ECC. CAC-ECC without fly ash addition was the most optimal composition that achieved greater self-healing properties. The microstructural study approved the conversion of hydrates, without a noticeable effect on the self-healing results.
Abstract The reduced heating temperatures required for producing calcium aluminate cement (CAC) make it highly suitable for reducing CO2 emissions in engineered cementitious composites (ECCs) known with their significant amount of cement. However, it is not clear to what extent this can influence the advanced mechanical and self-healing ability of control ECC, especially with the risk of conversion in CAC reaction products. This study investigates the self-healing capability of ECCs produced using CAC instead of conventional ordinary Portland cement (OPC). It also assesses the impact of incorporating fly ash (FA) into CAC-ECC blends at different FA/CAC ratios. In addition to the mechanical characterisation of sound specimens, flexural properties, cracking behavior, ultra-sonic pulse velocity (UPV) and rapid chloride permeability test (RCPT) were performed on preloaded OPC- and CAC-ECCs. The study also analyzed the microstructural changes of self-healing products associated with the high alumina content of CAC. The results show that CAC can be used to produce high mechanical strengths ECCs, with more than 34% and 7% higher compressive and flexural strengths respectively than those of ECC-CTL at early age, though the addition of FA was important to reach improved patterns of mechanical properties at advanced ages. In addition, significant improvements were recorded for the recovery rates of CAC-ECCs, reaching more than 29% for flexural strengths, 11% for UPV and 75% for RCPT than the ECC-CTL. The self-healing products characterized with SEM-EDS confirmed the occurrence of conversion when FA was not included in CAC-ECCs, nevertheless with limited effect on the self-healing efficiency of these mixtures.
Self-healing capability of engineered cementitious composites with calcium aluminate cement
Zokaei, Shahin (Autor:in) / Siad, Hocine (Autor:in) / Lachemi, Mohamed (Autor:in) / Mahmoodi, Obaid (Autor:in) / Şahmaran, Mustafa (Autor:in)
18.08.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
CAC , Calcium Aluminosilicate Cements , ECC-CTL , Engineered cementitious composites with ordinary Portland Cements , CAC-ECCs , Engineered cementitious composites with calcium aluminosilicate cements , FA-F , Fly Ash Type F , OPC , Ordinary Portland Cements , ECC-CAC-0F , Engineered cementitious composites with calcium aluminosilicate cements and 0% fly ash , ECC-CAC-0.8F , Engineered cementitious composites with calcium aluminosilicate cements and fly ash/cement ratio of 0.8 , ECC-CAC-1.2F , Engineered cementitious composites with calcium aluminosilicate cements and fly ash/cement ratio of 1.2 , ECC-CAC-1.5F , Engineered cementitious composites with calcium aluminosilicate cements and fly ash/cement ratio of 1.5 , HRWRA , High range water reducing admixture , PVA , Polyvinyl alcohol fibers , SEM , Scanning Electron Microscopy , EDS , Energy-Dispersive X-Ray , C-S-H , Calcium Silicate Hydrate , C-A-S-H , Calcium Alumino Silicate Hydrate , UPV , Ultrasonic pulse velocity , RCPT , Rapid chloride permeability test , Calcium aluminate cement , Engineered cementitious composites , Sustainability , Self-healing , Conversion , Cracking
Self-healing capability of large-scale engineered cementitious composites beams
| BASE | 2016
Self-healing capability of large-scale engineered cementitious composites beams
| British Library Online Contents | 2016
Self-healing capability of large-scale engineered cementitious composites beams
| BASE | 2016
Self-healing capability of large-scale engineered cementitious composites beams
| British Library Online Contents | 2016