【摘要】 针对轻混凝土拌和物在大流动性条件下,易于分层而导致工作性不良的现象,采用L-800混凝土拌和物流动性能测定仪,结合混凝土拌和物性能测定方法,研究了粉煤灰和硅灰等矿物掺合料对大流动性轻混凝土(HFLC)拌和物在不同时间间隔时流过40 cm距离的流动时间t(40,T)、坍落度和扩展度等工作性能的影响.结果表明,掺加矿物掺合料是保证HFLC拌和物具有较好性能的关键因素,Ⅰ级粉煤灰和硅灰的最佳掺量分别为水泥总用量的30%和2%.更多还原

【Abstract】 In view of the phenomena that mixtures of lightweight concrete were prone to be in separation in condition of high fluidity,which resulted in the bad workability of mixtures,a mended L-800 rheological testing apparatus of concrete mixtures and the testing methods of concrete mixtures workability were adopted to study influences of mineral admixtures,fly ash and silicon fume,on workability of the mixtures of high flowing lightweight concreto(HFLC),such as the value of t(40,T),which was the time when concrete mixtures flowing the length of 40 cm at the different time intervals,slump and spread values.The results indicate that the addition of the mineral admixtures is a key measure to make the mixtures have good performances and the optimal dosage of first grade fly ash and is 30% and 2% cement mass respectively.更多还原