不同养护制度对C50混凝土早期强度发展影响的试验研究

Experimental Study on Effect of Different Curing Regimes on Early Strength Development of C50 Concrete

摘要:

为明确养护制度对C50混凝土早期强度发展的影响，选取标准养护、蒸汽养护、自然养护和缺水养护4种制度进行对比试验。结果表明，养护制度对混凝土早期强度发展的影响显著。在3 d龄期时，蒸汽养护组的抗压强度最高达52.4 MPa，比标准养护组、自然养护组分别高出28.7%、46.4%；缺水养护组强度发展滞后，28 d龄期强度为标准养护组的84%。蒸汽养护组与标准养护组28 d龄期强度相近，自然养护组为标准养护组的97%。蒸汽养护制度可显著提高混凝土的早期强度，且不影响后期强度发展；在自然养护制度下，混凝土的早期强度较低，且缺水会导致强度出现不可逆的损失。建议预制构件优先采用蒸汽养护制度，现场浇筑结构需持续进行保湿养护并严禁中断。

Abstract:

To clarify the influence of curing regimes on the early strength development of C50 concrete, four curing regimes of standard curing, steam curing, natural curing and water shortage curing are selected for comparative tests. The results show that the curing regimes have a significant impact on early strength development of concrete. At the 3-day age, the compressive strength of the steam curing group reaches a maximum of 52.4 MPa, which is 28.7% and 46.4% higher than that of the standard curing group and the natural curing group, respectively. The strength development of the water shortage curing group lags behind, and the strength at 28 d of age is 84% of that of the standard curing group. The strength at 28 days of age in the steam curing group is similar to that in the standard curing group, while that in the natural curing group is 97% of that in the standard curing group. The steam curing regime can significantly enhance the early strength of concrete without affecting its later strength development. Under the natural curing regime, the early strength of concrete is relatively low, and the water shortage can lead to irreversible loss of strength. It is recommended that the prefabricated components give priority to the steam curing regime. For on-site cast structures, the continuous moisturizing curing is required and interruption is strictly prohibited.