冬季机场道面混凝土施工强度影响因素分析研究

Analysis Kesearch on Affecting Factors for Construction Strength of Airport Pavement Concrete in Winter

结合实际工程,模拟道面混凝土散热特点,研究了不同防冻剂掺量、保温措施、入模温度、环境温度对混凝土强度的影响规律。研究结果表明,随着环境温度的降低,混凝土强度降低,亚硝酸钠掺量低于2%不影响混凝土强度,超过4%则对混凝土强度造成一定损失。采用塑料海绵配合电热毯对试件进行保温加热、提高入模温度可以有效地提高混凝土强度。多元回归分析结果表明,保温措施对强度的影响最大。

Combination with actual engineerifig, the effecting rules of different antifreeze agent dosage, heat preservation measures, molding temperature, environment temperature on concrete strength are investigated through simulating the heat dissipation characteristics of pavement concrete. The results show that the concrete strength reduces with the decreasing of temperature, sodium nitrite content less than 2% will not affect the strength of concrete, while sodium nitrite dosage more than 4% will cause a certain loss of concrete strength. The concrete strength can be enhanced by adopting plastic sponge and electric blanket for heat preservation or increasing molding temperature. The result of multiple regression analysis indicate that heat preservation measures is the biggest influence on strength.