Influence of accelerating admixtures on high early strength cement performance using heat curing method
Recently, early-strength concrete has been applied widely in high-rise buildings and rigid pavement maintenance due to its advantages in time and cost reduction, and its construction efficiency. Admixtures including setting accelerators and hardening accelerators, are usually used to achieve high ea...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509522008786 |
| _version_ | 1797799037712203776 |
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| author | Wei-Chien Wang Hoang Trung Hieu Duong Chen-Hong Zhang |
| author_facet | Wei-Chien Wang Hoang Trung Hieu Duong Chen-Hong Zhang |
| author_sort | Wei-Chien Wang |
| collection | DOAJ |
| description | Recently, early-strength concrete has been applied widely in high-rise buildings and rigid pavement maintenance due to its advantages in time and cost reduction, and its construction efficiency. Admixtures including setting accelerators and hardening accelerators, are usually used to achieve high early-strength concrete. However, the mechanism of those admixtures at the early age of cement hydration was not clearly examined. Hence, this research investigated the influence of setting accelerators, hardening accelerators and their combinations on the hydration of cement paste using the heat curing method for the application to rigid pavement maintenance, and precast concrete. By evaluating the differences between the setting time, early compressive strength, exothermic curves, XRD patterns, and Fe-SEM images of the cement paste with and without adding Potassium bromide (KBr), Calcium formate (Ca(HCOO)2), and their combination, the results indicated that the addition of setting accelerators such as Ca(HCOO)2 had a significant effect on the setting behavior of cement paste instead of the compressive strength enhancement. Therefore, the addition of Ca(HCOO)2 also had a low effect on the mechanical strength of the paste when increasing the curing temperature. In contrast, the addition of hardening accelerators such as KBr had a greater accelerating impact on the mechanical strength of the cement paste when increasing the curing temperature. Combining a setting accelerator and a hardening accelerator could greatly improve cement paste early-age compressive strength for both normal and heat curing. Based on the XRD analysis, and the Fe-SEM results, numerous hydration products were formed in early-age cement hydration by the addition of 2.0 % KBr with 3.0 % Ca(HCOO)2, especially in 8 h of 50 °C curing temperature. Hence, this combination significantly enhanced the early mechanical strength of the cement pastes. |
| first_indexed | 2024-03-13T04:12:53Z |
| format | Article |
| id | doaj.art-c2a34bd446244b4f8167f3a44347ed36 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-03-13T04:12:53Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-c2a34bd446244b4f8167f3a44347ed362023-06-21T06:53:04ZengElsevierCase Studies in Construction Materials2214-50952023-07-0118e01746Influence of accelerating admixtures on high early strength cement performance using heat curing methodWei-Chien Wang0Hoang Trung Hieu Duong1Chen-Hong Zhang2Department of Civil Engineering, National Central University, Zhongli District, Taoyuan City 320317, Taiwan, ROCCorrresponding author.; Department of Civil Engineering, National Central University, Zhongli District, Taoyuan City 320317, Taiwan, ROCDepartment of Civil Engineering, National Central University, Zhongli District, Taoyuan City 320317, Taiwan, ROCRecently, early-strength concrete has been applied widely in high-rise buildings and rigid pavement maintenance due to its advantages in time and cost reduction, and its construction efficiency. Admixtures including setting accelerators and hardening accelerators, are usually used to achieve high early-strength concrete. However, the mechanism of those admixtures at the early age of cement hydration was not clearly examined. Hence, this research investigated the influence of setting accelerators, hardening accelerators and their combinations on the hydration of cement paste using the heat curing method for the application to rigid pavement maintenance, and precast concrete. By evaluating the differences between the setting time, early compressive strength, exothermic curves, XRD patterns, and Fe-SEM images of the cement paste with and without adding Potassium bromide (KBr), Calcium formate (Ca(HCOO)2), and their combination, the results indicated that the addition of setting accelerators such as Ca(HCOO)2 had a significant effect on the setting behavior of cement paste instead of the compressive strength enhancement. Therefore, the addition of Ca(HCOO)2 also had a low effect on the mechanical strength of the paste when increasing the curing temperature. In contrast, the addition of hardening accelerators such as KBr had a greater accelerating impact on the mechanical strength of the cement paste when increasing the curing temperature. Combining a setting accelerator and a hardening accelerator could greatly improve cement paste early-age compressive strength for both normal and heat curing. Based on the XRD analysis, and the Fe-SEM results, numerous hydration products were formed in early-age cement hydration by the addition of 2.0 % KBr with 3.0 % Ca(HCOO)2, especially in 8 h of 50 °C curing temperature. Hence, this combination significantly enhanced the early mechanical strength of the cement pastes.http://www.sciencedirect.com/science/article/pii/S2214509522008786High early strengthHardening acceleratorSetting acceleratorHeat curing methodCement hydration kineticsCuring temperature |
| spellingShingle | Wei-Chien Wang Hoang Trung Hieu Duong Chen-Hong Zhang Influence of accelerating admixtures on high early strength cement performance using heat curing method Case Studies in Construction Materials High early strength Hardening accelerator Setting accelerator Heat curing method Cement hydration kinetics Curing temperature |
| title | Influence of accelerating admixtures on high early strength cement performance using heat curing method |
| title_full | Influence of accelerating admixtures on high early strength cement performance using heat curing method |
| title_fullStr | Influence of accelerating admixtures on high early strength cement performance using heat curing method |
| title_full_unstemmed | Influence of accelerating admixtures on high early strength cement performance using heat curing method |
| title_short | Influence of accelerating admixtures on high early strength cement performance using heat curing method |
| title_sort | influence of accelerating admixtures on high early strength cement performance using heat curing method |
| topic | High early strength Hardening accelerator Setting accelerator Heat curing method Cement hydration kinetics Curing temperature |
| url | http://www.sciencedirect.com/science/article/pii/S2214509522008786 |
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