2004 Fiscal Year Final Research Report Summary
Development of Non-Chloride Concrete Setting Accelerator and the Study of its Application to Concrete Derived from Industrial Byproducts
| Project/Area Number |
15560501
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Building structures/materials
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| Research Institution | Nihon University |
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Principal Investigator |
UMEMURA Yasuhiro Nihon University, College of Science and Technology, Associate Professor, 理工学部, 助教授 (70246825)
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| Co-Investigator(Kenkyū-buntansha) |
TSUYUKI Naomitsu Nihon University, College of Science and Technology, Professor, 理工学部, 教授 (20059611)
KOIZUMI Koushiro Nihon University, College of Science and Technology, Assistant, 理工学部, 助手 (10312042)
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| Project Period (FY) |
2003 – 2004
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| Keywords | setting accelerator / superplasticizer / viscosity agent / admixture / blast-furnace slag / fly-ash / high-flow concrete |
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| Research Abstract |
In high-performance concrete, a delay in setting may result with the addition of large amounts of superplasticizer, viscosity agent, and other admixtures. To solve this problem, a setting accelerator is used, which traditionally used to be calcium chloride (CaCl_2). However, calcium chloride is not used currently because it leads to corrosion of steel reinforcements. In the present study, we have developed non-chloride compound setting accelerator, in which aluminum sulfate (Al_2(SO_4)_3) and barium nitrate (Ba(NO_3)_2) are the main components instead of calcium chloride. The effects of these additives on setting property, flow property, and compressive strength were investigated when industrial byproducts such as fly-ash and blast-furnace slag were used in the high-flow concrete. The setting time was found to be shortened by about 30-40% while maintaining a similar flow property to concrete without a setting accelerator. The performance was increased by about 15% compared with that of the calcium nitrite accelerator which is presently used.
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