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首页> 外文会议>Fourth International Conference on Repair, Rehabilitation, and Maintenance of Concrete Structures, and Innovations in Design and Construction Seoul, Korea, September 2000 >Influence of Different Curing Conditions on Strength and Durability of High-Performance Concrete
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Influence of Different Curing Conditions on Strength and Durability of High-Performance Concrete

机译：不同养护条件对高性能混凝土强度和耐久性的影响

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This paper deals with the effect of different curing methods on the strength and durability of high performance concrete exposed to medium temperature. Strength was measured in terms of compressive strength while durability was indicated in terms of initial surface absorption of surface layer concrete or covercrete. High performance concretes were prepared with the water-binder ratio of 0.35. Cylindrical specimens were cast for the test of compressive strength and they were cured under three types of curing conditions such as standard (20 deg C) and moderately elevated curing temperatures (35 deg C & 50 deg C). Initially the three groups of specimens were cured for 3,7 and 14 days respectively at 20 deg C. Later, the curing continued at 35 deg C and 50 deg C up to 91 days. The aim was to determine the most efficient curing method, period and temperature to get higher compressive strength. Test results indicated that the performance of water curing as well as wrapped curing was consistently better. Specimens at the age of 7 and 14 days of initial water curing provided good results. Silica fume (SF) concrete produced the highest compressive strength at the age of 91 days under these curing conditions. This finding suggests that high performance concrete should be cured by water and the minimum curing period ought to be at least 7 days. Test results also showed that higher compressive strength develops in the temperature range of 20 deg C to 35 deg C. Besides, cubical specimens were also prepared, cured and tested at the age of 28 days to determine the initial surface absorption. Test results revealed that water-cured specimens of silica fume concrete had the lowest initial surface absorption. Hence, the performance of concrete containing silica fume was consistently better with water curing.
机译：本文探讨了不同固化方法对中温下高性能混凝土强度和耐久性的影响。强度以抗压强度表示，而耐久性以表层混凝土或覆盖层混凝土的初始表面吸收表示。制备的水灰比为0.35的高性能混凝土。铸造圆柱状样品以测试抗压强度，并在三种类型的固化条件下（例如标准温度（20摄氏度）和适度升高的固化温度（35摄氏度和50摄氏度））进行固化。最初，将三组样品分别在20摄氏度下固化3,7和14天。之后，在35摄氏度和50摄氏度下继续固化长达91天。目的是确定最有效的固化方法，周期和温度以获得更高的抗压强度。测试结果表明，水固化和包裹固化的性能始终更好。初始水固化的7和14天龄的标本提供了良好的结果。在这些固化条件下，硅粉（SF）混凝土在91天的使用期限内产生了最高的抗压强度。这一发现表明，高性能混凝土应用水固化，最短固化时间应至少为7天。测试结果还表明，在20摄氏度至35摄氏度的温度范围内会产生更高的抗压强度。此外，还准备了立方样品，固化并在28天的老化后进行了测试，以确定其初始表面吸收率。测试结果表明，水凝硅粉混凝土的初始表面吸收最低。因此，含硅粉的混凝土在水固化时的性能始终更好。

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