摘要
为了研究水泥用量对冷拌SMA-5沥青混合料路用性能的影响,通过可拌和时间试验、粘聚力试验、马歇尔强度试验、无侧限抗压强度试验及劈裂试验,分别探讨了水泥对冷拌SMA-5沥青混合料的可拌和时间、成型速度、水稳定性及高低温性能的影响规律。研究结果得出水泥掺量不大于2%时,冷拌SMA-5能满足拌和时间要求;当水泥用量达到2. 0%时,混合料30 min和60 min的粘结力分别为1. 3 N·m和2. 1 N·m,养生期为7 d、水泥掺量为2%时,冷拌SMA-5沥青混合料冻融劈裂强度比大于75%,满足规范要求;就高温性能而言,当水泥掺量为1%时,动稳定度超过2 000次/mm,能够满足路面使用需求,冷拌SMA-5沥青混合料的弯拉应变随着水泥掺量的增加出现先增大后降低的趋势,但掺量为2%时,低温劲度模量最大,因此,水泥用量不宜超过2%时SMA-5路用性能最佳。
In order to study the influence of cement content on pavement performance of cold-mix sma-5 asphalt mixture,the effects of cement on the mixable time,forming speed,water stability and high and low temperature performance of cold-mix SMA-5 asphalt mixture were investigated by mixing time test,cohesion test,Marshall strength test,unconfined compressive strength test and splitting test.The results showed that when the cement content was no more than 2%,cold mixing SMA-5 could meet the mixing time requirements.When the cement content reaches 2.0%,the adhesive forces for 30 min and 60 min of the mixture are 1.3 n·m and 2.1 n·m respectively.When the health maintenance period is 7 d and the cement content is 2%,the freeze-thaw split strength ratio of the cold-mixed SMA-5 asphalt mixture is greater than 75%,which meets the requirements of the specification.In terms of high-temperature performance,when the cement content is 1%,the dynamic stability is over 2000 times/mm,which can meet the pavement service demand.The bending strain of cold mixed SMA-5 asphalt mixture increases first and then decreases with the increase of cement content.However,when the content is 2%,the stiffness modulus at low temperature is the largest.Generally speaking,cement content should not exceed 2%.
引文
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