融雪剂对沥青混合料水稳定性的影响

Effect of snow melting agent on water stability of asphalt mixture

为研究不同种类、不同质量浓度的融雪剂对沥青混合料水稳定性的影响,通过对AC-13沥青混合料试件进行浸盐马歇尔试验和盐冻融循环试验,分析融雪剂对沥青混合料的残留稳定度、冻融劈裂抗拉强度、冻融劈裂试验强度比及空隙率的影响规律。结果表明:与清水组相比,浸泡过质量浓度为0.20 g/mL的NaAc融雪剂试件的残留稳定度下降了6.25%;当盐冻融循环次数为10次时,冻融劈裂抗拉强度、冻融劈裂试验强度比、空隙率分别下降了40.2%、40.2%、1.6%;不同种类融雪剂对沥青混合料水稳定性与空隙率影响大小的排列顺序为NaCl>CaCl 2>NaAc。推荐使用质量浓度为0.20 g/mL的NaAc融雪剂进行道路融冰除雪。

To study the effect of different types and mass concentrations of snow melting agent on the water stability of asphalt mixture,the immersion salt Marshall test and salt freeze-thaw cycle test were carried out on the AC-13 asphalt mixture.The effect of snow melting agent on residual stability,freeze-thaw splitting tensile strength,freeze-thaw split test strength radio and void ratio of asphalt mixture were analyzed respectively.Compared with the clear water group,the residual stability of the NaAc snow melting agent sample with a mass concentration of 0.20 g/mL is reduced by 6.25%.When the number of salt freeze-thaw cycles is 10,freeze-thaw splitting tensile strength,freeze-thaw split test strength radio and void ratio of the test pieces will decrease by 40.2%,40.2%,and 1.6%respectively.The order of influence of different kinds of snow melting agents on the water stability and void ratio of asphalt mixture is NaCl>CaCl 2>NaAc.The NaAc with mass concentration of 0.20 g/mL is recommended to be used as snow melting agent for ice melting and snow removal.