高寒地区道面混凝土抗冻性能研究

Study on Frost Resistance of Pavement Concrete in Alpine Area

鉴于高寒地区混凝土冻融循环频繁、易冻坏,因此,如何提高混凝土抗冻性能是关键。阐述了对高寒地区道面混凝土抗冻性能进行的研究,重点研究了道面混凝土水胶比、砂率、胶材用量和含气量对其抗冻性能的影响。研究结果表明:在满足道面混凝土设计指标和现场施工性能的前提下,增加胶材用量、降低水胶比、砂率和含气量均有利于道面混凝土抗冻性能的提高,据此设计的道面混凝土抗冻等级能够达到F300。研究成果对高寒地区道面混凝土抗冻性能的设计具有指导意义。

In view of freze thaw cycles and vulnerability to frost damage of the concrete in the alpine area,how to improve the frost resistance of concrete is the key.This paper describes the study on the frost resistance of pavement concrete in alpine area,focusing on the effects of the water-binder ratio,sand ratio,adhesive materials and air content on the frost resistance of pavement concrete.The results show that on the premise of meeting the pavement concrete design index and field construction performance,increasing the amount of the adhesive materials,reducing the water-binder ratio,sand ratio and air content are conducive to improving the frost resistance of the pavement concrete.According to the above design,the grade of the frost resistance of pavement concrete can reach F300.The study results have a certain guiding significance for the pavement concrete in alpine area.