• Title/Summary/Keyword: coolants

Search Result 71, Processing Time 0.019 seconds

Fundamental Study on High Strength and High Durability Cement Concrete Pavement: Part II Strength and Durability Evaluations (시멘트콘크리트 포장의 고강도 고내구성을 위한 기초 연구 : Part II 최적배합콘크리트의 강도 및 내구특성 분석)

  • Yun, Kyong-Ku;Park, Cheol-Woo;Hong, Seung-Ho
    • International Journal of Highway Engineering
    • /
    • v.11 no.3
    • /
    • pp.51-60
    • /
    • 2009
  • This study investigates the fresh state characteristics, strength, chloride ion penetration resistance and freeze-thaw resistance of the suggested high strength-high durability cement concrete pavement. The required workability and air content could be achieved by using an appropriate admixtures. However its dosage should be carefully determined through field trial batches. Compressive strength increased with the increased cement content and, in particular, high cement volume concrete continuously developed strength up to 90 days. No clear relationship, however, existed between flexural strength and cement content. Chloride penetration resistance seemed as a function of curing age rather than the cement content. Freeze-thaw resistance test was conducted using two different coolants, tap water and 4% NaCl solution. When the tap water was used no severe damage was observed up to 300 cycles regardless the air content. Under 4% NaCl solution, specimens of 326kg/$m^3$ cement content showed severe damage with surface scaling. Based on the experimental investigations herein, it is highly recommended that the cement content be greater than 400kg/$m^3$ for strength-high durability cement concrete pavement structures.

  • PDF