• Title/Summary/Keyword: frost-resistant accelerator

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Shrinkage Properties of Blast Furnance Slag Cement Mortar by using Frost-Resistant Accelerator (내한촉진제를 사용한 고로시멘트 모르타르의 수축성상)

  • Choi, Hyeong-Gil;Lee, Jun-Cheol
    • Journal of the Korea Institute of Building Construction
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    • v.19 no.1
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    • pp.59-66
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    • 2019
  • In this study, the effects of blast furnance slag cement and frost-resistant accelerator on shrinkage properties and shrinkage properties of mortar were examined. As a result, the addition of the frost-resistant accelerator to both OPC and BB has a small effect on the flash properties of mortar and the compressive strength increases from the early ages. In addition, when a frost-resistant accelerator is used in excess of the standard usage amount, it is necessary to examine the relationship of the expansion behavior at the early age, especially, between the compressive strength development and the expansion property. And it was confirmed that the addition of the frost-resistant accelerator tended to increase the shrinkage of mortar using the OPC and BB. With the addition of the frost-resistant accelerator, the amount of pores with a diameter of under the 30nm, especially, the amount of pores with a diameter of 20 to 30nm and the amount of pores with an ink-bottle decrease, and the shrinkage increases. And it is considered that a change in the amount this range of pores has a large effect on the shrinkage property.

A Study on the Shrinkage Cracking Properties of Concrete by Using Blast Furnace Slag Cement and Frost-Resistant Accelerator (고로슬래그시멘트 및 내한촉진제를 사용한 콘크리트의 수축균열특성에 관한 연구)

  • Choi, Hyeong-Gil;Choi, Hee-Sup
    • Journal of the Korea Institute of Building Construction
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    • v.19 no.2
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    • pp.123-130
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    • 2019
  • As a cold-weather-concrete construction technique for enhancing the sustainability and improving efficiency of cold-weather construction, the cracking timing, the starting point of deterioration for concrete, due to the shrinkage of the blast furnace slag cement concrete including accelerator was evaluated. As a result, by using blast furnace slag and accelerator, the cracking was developed faster with higher cracking potential under the restrained conditions at constant age and free-shrinkage strain. It can be considered that the results of decreased stress relaxation by creep or increased restraint with increased free-shrinkage strain causes the increased cracking development speed. Hence, it should be considered the necessary of cracking due to the shrinkage when blast furnace slag or accelerator was used for cold-weather construction.