• Title/Summary/Keyword: 보온 양생

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Rooting-Potential of Sod by Transplanting Time and Turfgrass Species (이식 시기와 초종에 따른 잔디뿌리의 활착력)

  • 주영규;김덕환;이성호;이정호
    • Asian Journal of Turfgrass Science
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    • v.17 no.2_3
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    • pp.67-73
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    • 2003
  • A series of studies was conducted during 2 years to investigate the effect of transplanting time and turfgrass species on turf establishment rate of sod for 2002 World Cup Soccer ground construction. The required period of rooting and turf growth for acceptable soccer playing quality on transplanted sod from nursery was tested to collect data for the project authorities of hosting cities and construction companies who were involved in World Cup stadium project. Transplanting time significantly affects on rooting-potential of sod on cool season grass and zoysiagrass, but those effects differently showed by turfgrass species. The enough nursing period for the ground established by Zousiagrass should be secured with proper transplanting time. And the thermal insulation on the turf canopy with other maintenance during Winter should improve the early rooting on zoysiagrass. The sod contained Kentucky bluegrass (85%+15% perennial ryegrass, seed wt. basis) showed relatively slow at the early growth and rooting-potential of root, but the potential resulted higher than that of perennial ryegrass turf (85%+15% Kentucky) under longer nursing period. Kentucky bluegrass has one of the most strong resistance against environmental stresses, but intensive maintenance practise should be required when the turf transplanted during summer season. Higher mixture rate of perennial ryegrass sod has a rapid root growth compare with other turfgrass species. The rate provided a benefit to an early establishment of turf ground followed by a proper maintenance practise. For the completion of World Cup soccer ground construction for 2002, the most suitable time for sod transplanting in 2001 was March to May or mid Sept. to early Oct. by delayed architect construction schedule.

Compressive Strength and Fluidity of Low Temperature Curable Mortar Using High Early Strength Cement According to Types of Anti-freezer, Accelerator for Freeze Protection and Water Reducing Agent (조강형시멘트를 사용한 저온경화형 모르타르의 압축강도 및 유동특성에 미치는 방동제, 내한촉진제 및 감수제의 영향)

  • Park, Jung-Hoon;Ki, Kyoung-Kuk;Lee, Han-Seung;Kim, Hyeong-Cheol;Choi, Hyun-Kuk;Min, Tae-Beom
    • Journal of the Korea Institute of Building Construction
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    • v.16 no.5
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    • pp.405-412
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    • 2016
  • In order to examine the possibility of practical use of concrete at low-temperature environment using high early strength cement with cold resistance admixture, an experimental study on workability, freezing temperature and compressive strength of the mortar with different types of anti-freezer, water reducing agent and accelerator for freeze protection at low-temperature were evaluated. Compressive strength was increased in use of anti-freezer, especially SN anti-freezer was higher than CN anti-freezer. 0min flow was increased, the 20min flow was decreased. And 20min flow was improved in use of FR, RT water reducing agent. CF, LS accelerator for freeze protection, regardless of the type of water reducing agent, compressive strength was increased.