Late age mechanical strengths and hydration of ultra high performance concrete blended with metakaolin and high volume limestone
By: Mo, Zongyun
.
Contributor(s): Han, Youmin.
Publisher: Mumbai ACC LTD 2022Edition: Vol.96(11), Nov.Description: 18-27p.Subject(s): Civil EngineeringOnline resources: Click here
In:
Indian Concrete Journal - ICJSummary: In this study, late age re-hydration for metakaolin (MK) added ultra high performance concrete (UHPC) with water curing from 90 to 365 days were investigated. And limestone (LS) was also incorporated into UHPC replacing 30 % cement by binder mass for reducing the cement usage. In addition, cement and LS cement specimens without MK were prepared as the references. Mortar specimens were employed for testing the compressive and flexural strength at 90, 150, 210, 270, and 365 days. And paste specimens were used to measure the chemically bound water, differential thermal analysis (DTA) curves, X-ray diffraction (XRD) patterns, pore structures, and micro-morphology at designated ages. Results indicate that the re-hydration causes an increasing tendency for strength of mortars from 90 to 270 days while a decreasing tendency after 270 days. The re-hydration degree for MK contained mixtures are obviously lower than that of the references. MK can stabilize the late age mechanical property and micro-structure of water cured UHPC. Moreover, the combination of LS and MK do not obviously degrade the strength and micro-structure of long term water cured UHPC compared with that of binary MK contained mixture.
| Item type | Current location | Call number | Status | Date due | Barcode | Item holds |
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Articles Abstract Database
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School of Engineering & Technology (PG) Archieval Section | Not for loan | 2023-0041 |
In this study, late age re-hydration for metakaolin (MK) added ultra high performance concrete (UHPC) with water curing from 90 to 365 days were investigated. And limestone (LS) was also incorporated into UHPC replacing 30 % cement by binder mass for reducing the cement usage. In addition, cement and LS cement specimens without MK were prepared as the references. Mortar specimens were employed for testing the compressive and flexural strength at 90, 150, 210, 270, and 365 days. And paste specimens were used to measure the chemically bound water, differential thermal analysis (DTA) curves, X-ray diffraction (XRD) patterns, pore structures, and micro-morphology at designated ages. Results indicate that the re-hydration causes an increasing tendency for strength of mortars from 90 to 270 days while a decreasing tendency after 270 days. The re-hydration degree for MK contained mixtures are obviously lower than that of the references. MK can stabilize the late age mechanical property and micro-structure of water cured UHPC. Moreover, the combination of LS and MK do not obviously degrade the strength and micro-structure of long term water cured UHPC compared with that of binary MK contained mixture.
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