Influence of cement type and curing on the drying and air permeability of cover concrete
Influence of cement type and curing on the drying and air permeability of cover concrete
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DOI：
10.1680/macr.1995.47.171.103
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发表时间：
1995-06
影响因子：
2.7
通讯作者：
L. Parrott
中科院分区：
文献类型：
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作者：
L. Parrott
试验结果表明，在60%相对湿度条件下干燥至少18个月后，水泥类型和养护对覆盖混凝土的相对湿度、初始失重和透气性的影响。使用了3个养护期（1、3和28天）和17种水泥，水泥的不同主要在于石灰石或磨粒高炉渣（ggbs）的含量。水灰比均为0·59,28天立方体强度为26 ~ 46 MPa。干燥6个月和18个月后，暴露面以下25mm平均深度的相对湿度分别降至80%和70%左右。水泥类型对相对湿度随干燥时间的降低作用不大，随着养护时间的延长，对干燥速率的影响也不大。最初的4天重量损失，在覆盖混凝土的水分输送性能的指标，显着减少随着养护时间的增加。Increasi……
Experimental results are presented showing the influence of cement type and curing on the relative humidity, initial weight loss and air permeation in cover concrete that has been exposed to drying at 60% relative humidity for at least 18 months. Three curing periods (1,3 and 28 days) and 17 cements were used, the cements differing mainly with respect to their contents of limestone or ground granulated blastfurnace slag (ggbs). The concretes were all made with a water-cement ratio of 0·59 and the 28 day cube strengths ranged from 26 to 46 MPa. The relative humidity at a mean depth of 25 mm below the exposed sudace reduced to about 80% and 70% after 6 and 18 months of drying respectively. Cement type had little on the reduction of relative humidity with drying time and there was only a marginal retardation of drying rate with increased curing time. The initial four day weight loss, an indicator of moisture transport properties in cover concrete, reduced markedly as the curing period was increased. Increasi...