机场道面碾压混凝土拌合物和易性要求

分析目前国内外表征碾压混凝土拌合物和易性方法存在的问题 ,提出机场道面碾压混凝土拌合物和易性的测定方法 ,以改进型维勃稠度 (“VC”值 )和振实率两个指标表征拌合物的和易性。“VC”值主要反映拌合物的流动性 ,振实率则表达此流动性的振实效果。试验表明 ,提出的“VC”值与振实率建议指标 ,能保证碾压混凝土拌合物在振碾过程中 ,能达到较短时间内充分密实 ,并获得良好的表面质量

Demands for Mixture wTorkability of AirportPavement Rolling Compacted Concrete

we analyse the existing problems m vanous methods to evaluate RCC mixture workability used at home and abroad , bring up a new test method in which we adopt two quality indexes - value of "VC"and compactness to indicate mlxture workability. Value of "VC" mainly reflects conslstency ,while compactness reflects effect of compactmg m a glven conslstency. As shown m the expenment ,the indexes of "VC" and compactness can ensure the RCC mlxture , while vibrated &. rolled , will be compacted easily and tightly , thus get a good surface quality.