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A platform for research: civil engineering, architecture and urbanism
Evaluation of the shrinkage properties and crack resistance performance of cement-stabilized pure coal-based solid wastes as pavement base materials
https://orcid.org/0000-0002-0402-4478
Abstract The unclear shrinkage performance of cement-stabilized pure coal-based solid wastes (CSPCBSW) mixture hinders its widespread application in pavement base. Thus, it is crucial to comprehensively investigate the shrinkage performance and clarify the shrinkage mechanism. In this study, the drying shrinkage test, thermal shrinkage test, microstructure detection, evaluation of the crack resistance performance, and field application were performed. The results show that the drying shrinkage strain (DSS) and drying shrinkage coefficient (DSC) have a negative linear correlation with coal bottom ash replacement rate (CBARR) and a positive linear association with cement content. However, the thermal shrinkage strain (TSS) and thermal shrinkage coefficient (TSC) exhibit an opposite variation trend concerning CBARR and cement content. The variation in moisture loss rate, DSS and DSC of the mixtures follow a three-stage pattern: linear growth (0–7 days), gradually slowing growth (8–30 days), and nearly horizontal growth (31–180 days). Increasing the cement content and CBARR effectively reduce the complexity of pore edges and enhance the uniformity of pores. Moreover, the main influencing factors of thermal and drying shrinkage of the mixtures at different stages were revealed. The newly proposed comprehensive crack resistance index was confirmed to be reliable and reasonable via field application. It is recommended that the CBARR of the mixtures should be equal to or greater than 50%. A series of tests verify that the novel eco-friendly green mixture holds significant potential for application in future pavement base.
Graphical Abstract Display Omitted
Highlights The shrinkage properties of cement-stabilized pure CBSW were systematically investigated. A mathematical model for the time-dependent variation of drying shrinkage strain in the mixture was proposed. The relationship between microstructural parameters and mixture ratios of the mixtures was quantitatively characterized. A novel and comprehensive method for quantitatively evaluating the crack resistance of the mixtures was proposed. The thermal and drying shrinkage mechanisms of the mixtures were revealed.
Evaluation of the shrinkage properties and crack resistance performance of cement-stabilized pure coal-based solid wastes as pavement base materials
https://orcid.org/0000-0002-0402-4478
Abstract The unclear shrinkage performance of cement-stabilized pure coal-based solid wastes (CSPCBSW) mixture hinders its widespread application in pavement base. Thus, it is crucial to comprehensively investigate the shrinkage performance and clarify the shrinkage mechanism. In this study, the drying shrinkage test, thermal shrinkage test, microstructure detection, evaluation of the crack resistance performance, and field application were performed. The results show that the drying shrinkage strain (DSS) and drying shrinkage coefficient (DSC) have a negative linear correlation with coal bottom ash replacement rate (CBARR) and a positive linear association with cement content. However, the thermal shrinkage strain (TSS) and thermal shrinkage coefficient (TSC) exhibit an opposite variation trend concerning CBARR and cement content. The variation in moisture loss rate, DSS and DSC of the mixtures follow a three-stage pattern: linear growth (0–7 days), gradually slowing growth (8–30 days), and nearly horizontal growth (31–180 days). Increasing the cement content and CBARR effectively reduce the complexity of pore edges and enhance the uniformity of pores. Moreover, the main influencing factors of thermal and drying shrinkage of the mixtures at different stages were revealed. The newly proposed comprehensive crack resistance index was confirmed to be reliable and reasonable via field application. It is recommended that the CBARR of the mixtures should be equal to or greater than 50%. A series of tests verify that the novel eco-friendly green mixture holds significant potential for application in future pavement base.
Graphical Abstract Display Omitted
Highlights The shrinkage properties of cement-stabilized pure CBSW were systematically investigated. A mathematical model for the time-dependent variation of drying shrinkage strain in the mixture was proposed. The relationship between microstructural parameters and mixture ratios of the mixtures was quantitatively characterized. A novel and comprehensive method for quantitatively evaluating the crack resistance of the mixtures was proposed. The thermal and drying shrinkage mechanisms of the mixtures were revealed.
Evaluation of the shrinkage properties and crack resistance performance of cement-stabilized pure coal-based solid wastes as pavement base materials
https://orcid.org/0000-0002-0402-4478
Abstract The unclear shrinkage performance of cement-stabilized pure coal-based solid wastes (CSPCBSW) mixture hinders its widespread application in pavement base. Thus, it is crucial to comprehensively investigate the shrinkage performance and clarify the shrinkage mechanism. In this study, the drying shrinkage test, thermal shrinkage test, microstructure detection, evaluation of the crack resistance performance, and field application were performed. The results show that the drying shrinkage strain (DSS) and drying shrinkage coefficient (DSC) have a negative linear correlation with coal bottom ash replacement rate (CBARR) and a positive linear association with cement content. However, the thermal shrinkage strain (TSS) and thermal shrinkage coefficient (TSC) exhibit an opposite variation trend concerning CBARR and cement content. The variation in moisture loss rate, DSS and DSC of the mixtures follow a three-stage pattern: linear growth (0–7 days), gradually slowing growth (8–30 days), and nearly horizontal growth (31–180 days). Increasing the cement content and CBARR effectively reduce the complexity of pore edges and enhance the uniformity of pores. Moreover, the main influencing factors of thermal and drying shrinkage of the mixtures at different stages were revealed. The newly proposed comprehensive crack resistance index was confirmed to be reliable and reasonable via field application. It is recommended that the CBARR of the mixtures should be equal to or greater than 50%. A series of tests verify that the novel eco-friendly green mixture holds significant potential for application in future pavement base.
Graphical Abstract Display Omitted
Highlights The shrinkage properties of cement-stabilized pure CBSW were systematically investigated. A mathematical model for the time-dependent variation of drying shrinkage strain in the mixture was proposed. The relationship between microstructural parameters and mixture ratios of the mixtures was quantitatively characterized. A novel and comprehensive method for quantitatively evaluating the crack resistance of the mixtures was proposed. The thermal and drying shrinkage mechanisms of the mixtures were revealed.
Evaluation of the shrinkage properties and crack resistance performance of cement-stabilized pure coal-based solid wastes as pavement base materials
Yan, Pengfei (author) / Ma, Zhanguo (author) / Li, Hongbo (author) / Gong, Peng (author) / Liu, Zilu (author) / Han, Jiashu (author) / Xu, Min (author) / Hua, Shudong (author)
2024-02-29
Article (Journal)
Electronic Resource
English
FA , fly ash , CBA , coal bottom ash , CG , coal gangue , CBSW , coal-based solid wastes , CSPCBSW , cement-stabilized pure coal-based solid wastes , CSM , cement-stabilized macadam , RHA , rice husk ash , RAP , recycled asphalt pavement , DSS , drying shrinkage strain , DSC , drying shrinkage coefficient , TSS , thermal shrinkage strain , TSC , thermal shrinkage coefficient , SEM , scanning electron microscopy , PCAS , pores particles and cracks analysis system , ITZ , interface transition zone , UCS , unconfined compressive strength , RH , relative humidity , Cement-stabilized pure coal-based solid wastes mixture , Drying and thermal shrinkage , Microstructural analysis , Comprehensive crack resistance index , Shrinkage performance evaluation
| Taylor & Francis Verlag | 2024